diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_backlight.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_backlight.c | 1776 |
1 files changed, 1776 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_backlight.c b/drivers/gpu/drm/i915/display/intel_backlight.c new file mode 100644 index 000000000000..9523411cddd8 --- /dev/null +++ b/drivers/gpu/drm/i915/display/intel_backlight.c @@ -0,0 +1,1776 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2021 Intel Corporation + */ + +#include <linux/kernel.h> +#include <linux/pwm.h> + +#include "intel_backlight.h" +#include "intel_connector.h" +#include "intel_de.h" +#include "intel_display_types.h" +#include "intel_dp_aux_backlight.h" +#include "intel_dsi_dcs_backlight.h" +#include "intel_panel.h" + +/** + * scale - scale values from one range to another + * @source_val: value in range [@source_min..@source_max] + * @source_min: minimum legal value for @source_val + * @source_max: maximum legal value for @source_val + * @target_min: corresponding target value for @source_min + * @target_max: corresponding target value for @source_max + * + * Return @source_val in range [@source_min..@source_max] scaled to range + * [@target_min..@target_max]. + */ +static u32 scale(u32 source_val, + u32 source_min, u32 source_max, + u32 target_min, u32 target_max) +{ + u64 target_val; + + WARN_ON(source_min > source_max); + WARN_ON(target_min > target_max); + + /* defensive */ + source_val = clamp(source_val, source_min, source_max); + + /* avoid overflows */ + target_val = mul_u32_u32(source_val - source_min, + target_max - target_min); + target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min); + target_val += target_min; + + return target_val; +} + +/* + * Scale user_level in range [0..user_max] to [0..hw_max], clamping the result + * to [hw_min..hw_max]. + */ +static u32 clamp_user_to_hw(struct intel_connector *connector, + u32 user_level, u32 user_max) +{ + struct intel_panel *panel = &connector->panel; + u32 hw_level; + + hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max); + hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max); + + return hw_level; +} + +/* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */ +static u32 scale_hw_to_user(struct intel_connector *connector, + u32 hw_level, u32 user_max) +{ + struct intel_panel *panel = &connector->panel; + + return scale(hw_level, panel->backlight.min, panel->backlight.max, + 0, user_max); +} + +u32 intel_backlight_invert_pwm_level(struct intel_connector *connector, u32 val) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + + drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0); + + if (dev_priv->params.invert_brightness < 0) + return val; + + if (dev_priv->params.invert_brightness > 0 || + dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) { + return panel->backlight.pwm_level_max - val + panel->backlight.pwm_level_min; + } + + return val; +} + +void intel_backlight_set_pwm_level(const struct drm_connector_state *conn_state, u32 val) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *i915 = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + + drm_dbg_kms(&i915->drm, "set backlight PWM = %d\n", val); + panel->backlight.pwm_funcs->set(conn_state, val); +} + +u32 intel_backlight_level_to_pwm(struct intel_connector *connector, u32 val) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + + drm_WARN_ON_ONCE(&dev_priv->drm, + panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0); + + val = scale(val, panel->backlight.min, panel->backlight.max, + panel->backlight.pwm_level_min, panel->backlight.pwm_level_max); + + return intel_backlight_invert_pwm_level(connector, val); +} + +u32 intel_backlight_level_from_pwm(struct intel_connector *connector, u32 val) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + + drm_WARN_ON_ONCE(&dev_priv->drm, + panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0); + + if (dev_priv->params.invert_brightness > 0 || + (dev_priv->params.invert_brightness == 0 && dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS)) + val = panel->backlight.pwm_level_max - (val - panel->backlight.pwm_level_min); + + return scale(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max, + panel->backlight.min, panel->backlight.max); +} + +static u32 lpt_get_backlight(struct intel_connector *connector, enum pipe unused) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + + return intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK; +} + +static u32 pch_get_backlight(struct intel_connector *connector, enum pipe unused) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + + return intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; +} + +static u32 i9xx_get_backlight(struct intel_connector *connector, enum pipe unused) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 val; + + val = intel_de_read(dev_priv, BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK; + if (DISPLAY_VER(dev_priv) < 4) + val >>= 1; + + if (panel->backlight.combination_mode) { + u8 lbpc; + + pci_read_config_byte(to_pci_dev(dev_priv->drm.dev), LBPC, &lbpc); + val *= lbpc; + } + + return val; +} + +static u32 vlv_get_backlight(struct intel_connector *connector, enum pipe pipe) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + + if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B)) + return 0; + + return intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK; +} + +static u32 bxt_get_backlight(struct intel_connector *connector, enum pipe unused) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + + return intel_de_read(dev_priv, + BXT_BLC_PWM_DUTY(panel->backlight.controller)); +} + +static u32 ext_pwm_get_backlight(struct intel_connector *connector, enum pipe unused) +{ + struct intel_panel *panel = &connector->panel; + struct pwm_state state; + + pwm_get_state(panel->backlight.pwm, &state); + return pwm_get_relative_duty_cycle(&state, 100); +} + +static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + + u32 val = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK; + intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, val | level); +} + +static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + u32 tmp; + + tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK; + intel_de_write(dev_priv, BLC_PWM_CPU_CTL, tmp | level); +} + +static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 tmp, mask; + + drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0); + + if (panel->backlight.combination_mode) { + u8 lbpc; + + lbpc = level * 0xfe / panel->backlight.pwm_level_max + 1; + level /= lbpc; + pci_write_config_byte(to_pci_dev(dev_priv->drm.dev), LBPC, lbpc); + } + + if (DISPLAY_VER(dev_priv) == 4) { + mask = BACKLIGHT_DUTY_CYCLE_MASK; + } else { + level <<= 1; + mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV; + } + + tmp = intel_de_read(dev_priv, BLC_PWM_CTL) & ~mask; + intel_de_write(dev_priv, BLC_PWM_CTL, tmp | level); +} + +static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe; + u32 tmp; + + tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK; + intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), tmp | level); +} + +static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + + intel_de_write(dev_priv, + BXT_BLC_PWM_DUTY(panel->backlight.controller), level); +} + +static void ext_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel; + + pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100); + pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state); +} + +static void +intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *i915 = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + + drm_dbg_kms(&i915->drm, "set backlight level = %d\n", level); + + panel->backlight.funcs->set(conn_state, level); +} + +/* set backlight brightness to level in range [0..max], assuming hw min is + * respected. + */ +void intel_backlight_set_acpi(const struct drm_connector_state *conn_state, + u32 user_level, u32 user_max) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 hw_level; + + /* + * Lack of crtc may occur during driver init because + * connection_mutex isn't held across the entire backlight + * setup + modeset readout, and the BIOS can issue the + * requests at any time. + */ + if (!panel->backlight.present || !conn_state->crtc) + return; + + mutex_lock(&dev_priv->backlight_lock); + + drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0); + + hw_level = clamp_user_to_hw(connector, user_level, user_max); + panel->backlight.level = hw_level; + + if (panel->backlight.device) + panel->backlight.device->props.brightness = + scale_hw_to_user(connector, + panel->backlight.level, + panel->backlight.device->props.max_brightness); + + if (panel->backlight.enabled) + intel_panel_actually_set_backlight(conn_state, hw_level); + + mutex_unlock(&dev_priv->backlight_lock); +} + +static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(old_conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + u32 tmp; + + intel_backlight_set_pwm_level(old_conn_state, level); + + /* + * Although we don't support or enable CPU PWM with LPT/SPT based + * systems, it may have been enabled prior to loading the + * driver. Disable to avoid warnings on LCPLL disable. + * + * This needs rework if we need to add support for CPU PWM on PCH split + * platforms. + */ + tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2); + if (tmp & BLM_PWM_ENABLE) { + drm_dbg_kms(&dev_priv->drm, + "cpu backlight was enabled, disabling\n"); + intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, + tmp & ~BLM_PWM_ENABLE); + } + + tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1); + intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE); +} + +static void pch_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val) +{ + struct intel_connector *connector = to_intel_connector(old_conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + u32 tmp; + + intel_backlight_set_pwm_level(old_conn_state, val); + + tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2); + intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE); + + tmp = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1); + intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE); +} + +static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val) +{ + intel_backlight_set_pwm_level(old_conn_state, val); +} + +static void i965_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val) +{ + struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev); + u32 tmp; + + intel_backlight_set_pwm_level(old_conn_state, val); + + tmp = intel_de_read(dev_priv, BLC_PWM_CTL2); + intel_de_write(dev_priv, BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE); +} + +static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val) +{ + struct intel_connector *connector = to_intel_connector(old_conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe; + u32 tmp; + + intel_backlight_set_pwm_level(old_conn_state, val); + + tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe)); + intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), + tmp & ~BLM_PWM_ENABLE); +} + +static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val) +{ + struct intel_connector *connector = to_intel_connector(old_conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 tmp; + + intel_backlight_set_pwm_level(old_conn_state, val); + + tmp = intel_de_read(dev_priv, + BXT_BLC_PWM_CTL(panel->backlight.controller)); + intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller), + tmp & ~BXT_BLC_PWM_ENABLE); + + if (panel->backlight.controller == 1) { + val = intel_de_read(dev_priv, UTIL_PIN_CTL); + val &= ~UTIL_PIN_ENABLE; + intel_de_write(dev_priv, UTIL_PIN_CTL, val); + } +} + +static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val) +{ + struct intel_connector *connector = to_intel_connector(old_conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 tmp; + + intel_backlight_set_pwm_level(old_conn_state, val); + + tmp = intel_de_read(dev_priv, + BXT_BLC_PWM_CTL(panel->backlight.controller)); + intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller), + tmp & ~BXT_BLC_PWM_ENABLE); +} + +static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(old_conn_state->connector); + struct intel_panel *panel = &connector->panel; + + panel->backlight.pwm_state.enabled = false; + pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state); +} + +void intel_backlight_disable(const struct drm_connector_state *old_conn_state) +{ + struct intel_connector *connector = to_intel_connector(old_conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + + if (!panel->backlight.present) + return; + + /* + * Do not disable backlight on the vga_switcheroo path. When switching + * away from i915, the other client may depend on i915 to handle the + * backlight. This will leave the backlight on unnecessarily when + * another client is not activated. + */ + if (dev_priv->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) { + drm_dbg_kms(&dev_priv->drm, + "Skipping backlight disable on vga switch\n"); + return; + } + + mutex_lock(&dev_priv->backlight_lock); + + if (panel->backlight.device) + panel->backlight.device->props.power = FB_BLANK_POWERDOWN; + panel->backlight.enabled = false; + panel->backlight.funcs->disable(old_conn_state, 0); + + mutex_unlock(&dev_priv->backlight_lock); +} + +static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state, + const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 pch_ctl1, pch_ctl2, schicken; + + pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1); + if (pch_ctl1 & BLM_PCH_PWM_ENABLE) { + drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n"); + pch_ctl1 &= ~BLM_PCH_PWM_ENABLE; + intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1); + } + + if (HAS_PCH_LPT(dev_priv)) { + schicken = intel_de_read(dev_priv, SOUTH_CHICKEN2); + if (panel->backlight.alternate_pwm_increment) + schicken |= LPT_PWM_GRANULARITY; + else + schicken &= ~LPT_PWM_GRANULARITY; + intel_de_write(dev_priv, SOUTH_CHICKEN2, schicken); + } else { + schicken = intel_de_read(dev_priv, SOUTH_CHICKEN1); + if (panel->backlight.alternate_pwm_increment) + schicken |= SPT_PWM_GRANULARITY; + else + schicken &= ~SPT_PWM_GRANULARITY; + intel_de_write(dev_priv, SOUTH_CHICKEN1, schicken); + } + + pch_ctl2 = panel->backlight.pwm_level_max << 16; + intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2); + + pch_ctl1 = 0; + if (panel->backlight.active_low_pwm) + pch_ctl1 |= BLM_PCH_POLARITY; + + /* After LPT, override is the default. */ + if (HAS_PCH_LPT(dev_priv)) + pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE; + + intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1); + intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1); + intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, + pch_ctl1 | BLM_PCH_PWM_ENABLE); + + /* This won't stick until the above enable. */ + intel_backlight_set_pwm_level(conn_state, level); +} + +static void pch_enable_backlight(const struct intel_crtc_state *crtc_state, + const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + enum transcoder cpu_transcoder = crtc_state->cpu_transcoder; + u32 cpu_ctl2, pch_ctl1, pch_ctl2; + + cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2); + if (cpu_ctl2 & BLM_PWM_ENABLE) { + drm_dbg_kms(&dev_priv->drm, "cpu backlight already enabled\n"); + cpu_ctl2 &= ~BLM_PWM_ENABLE; + intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2); + } + + pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1); + if (pch_ctl1 & BLM_PCH_PWM_ENABLE) { + drm_dbg_kms(&dev_priv->drm, "pch backlight already enabled\n"); + pch_ctl1 &= ~BLM_PCH_PWM_ENABLE; + intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1); + } + + if (cpu_transcoder == TRANSCODER_EDP) + cpu_ctl2 = BLM_TRANSCODER_EDP; + else + cpu_ctl2 = BLM_PIPE(cpu_transcoder); + intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2); + intel_de_posting_read(dev_priv, BLC_PWM_CPU_CTL2); + intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE); + + /* This won't stick until the above enable. */ + intel_backlight_set_pwm_level(conn_state, level); + + pch_ctl2 = panel->backlight.pwm_level_max << 16; + intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2); + + pch_ctl1 = 0; + if (panel->backlight.active_low_pwm) + pch_ctl1 |= BLM_PCH_POLARITY; + + intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, pch_ctl1); + intel_de_posting_read(dev_priv, BLC_PWM_PCH_CTL1); + intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, + pch_ctl1 | BLM_PCH_PWM_ENABLE); +} + +static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state, + const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 ctl, freq; + + ctl = intel_de_read(dev_priv, BLC_PWM_CTL); + if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) { + drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n"); + intel_de_write(dev_priv, BLC_PWM_CTL, 0); + } + + freq = panel->backlight.pwm_level_max; + if (panel->backlight.combination_mode) + freq /= 0xff; + + ctl = freq << 17; + if (panel->backlight.combination_mode) + ctl |= BLM_LEGACY_MODE; + if (IS_PINEVIEW(dev_priv) && panel->backlight.active_low_pwm) + ctl |= BLM_POLARITY_PNV; + + intel_de_write(dev_priv, BLC_PWM_CTL, ctl); + intel_de_posting_read(dev_priv, BLC_PWM_CTL); + + /* XXX: combine this into above write? */ + intel_backlight_set_pwm_level(conn_state, level); + + /* + * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is + * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2 + * that has backlight. + */ + if (DISPLAY_VER(dev_priv) == 2) + intel_de_write(dev_priv, BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE); +} + +static void i965_enable_backlight(const struct intel_crtc_state *crtc_state, + const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe; + u32 ctl, ctl2, freq; + + ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2); + if (ctl2 & BLM_PWM_ENABLE) { + drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n"); + ctl2 &= ~BLM_PWM_ENABLE; + intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2); + } + + freq = panel->backlight.pwm_level_max; + if (panel->backlight.combination_mode) + freq /= 0xff; + + ctl = freq << 16; + intel_de_write(dev_priv, BLC_PWM_CTL, ctl); + + ctl2 = BLM_PIPE(pipe); + if (panel->backlight.combination_mode) + ctl2 |= BLM_COMBINATION_MODE; + if (panel->backlight.active_low_pwm) + ctl2 |= BLM_POLARITY_I965; + intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2); + intel_de_posting_read(dev_priv, BLC_PWM_CTL2); + intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE); + + intel_backlight_set_pwm_level(conn_state, level); +} + +static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state, + const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe; + u32 ctl, ctl2; + + ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe)); + if (ctl2 & BLM_PWM_ENABLE) { + drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n"); + ctl2 &= ~BLM_PWM_ENABLE; + intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2); + } + + ctl = panel->backlight.pwm_level_max << 16; + intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), ctl); + + /* XXX: combine this into above write? */ + intel_backlight_set_pwm_level(conn_state, level); + + ctl2 = 0; + if (panel->backlight.active_low_pwm) + ctl2 |= BLM_POLARITY_I965; + intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2); + intel_de_posting_read(dev_priv, VLV_BLC_PWM_CTL2(pipe)); + intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), + ctl2 | BLM_PWM_ENABLE); +} + +static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state, + const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe; + u32 pwm_ctl, val; + + /* Controller 1 uses the utility pin. */ + if (panel->backlight.controller == 1) { + val = intel_de_read(dev_priv, UTIL_PIN_CTL); + if (val & UTIL_PIN_ENABLE) { + drm_dbg_kms(&dev_priv->drm, + "util pin already enabled\n"); + val &= ~UTIL_PIN_ENABLE; + intel_de_write(dev_priv, UTIL_PIN_CTL, val); + } + + val = 0; + if (panel->backlight.util_pin_active_low) + val |= UTIL_PIN_POLARITY; + intel_de_write(dev_priv, UTIL_PIN_CTL, + val | UTIL_PIN_PIPE(pipe) | UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE); + } + + pwm_ctl = intel_de_read(dev_priv, + BXT_BLC_PWM_CTL(panel->backlight.controller)); + if (pwm_ctl & BXT_BLC_PWM_ENABLE) { + drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n"); + pwm_ctl &= ~BXT_BLC_PWM_ENABLE; + intel_de_write(dev_priv, + BXT_BLC_PWM_CTL(panel->backlight.controller), + pwm_ctl); + } + + intel_de_write(dev_priv, + BXT_BLC_PWM_FREQ(panel->backlight.controller), + panel->backlight.pwm_level_max); + + intel_backlight_set_pwm_level(conn_state, level); + + pwm_ctl = 0; + if (panel->backlight.active_low_pwm) + pwm_ctl |= BXT_BLC_PWM_POLARITY; + + intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller), + pwm_ctl); + intel_de_posting_read(dev_priv, + BXT_BLC_PWM_CTL(panel->backlight.controller)); + intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller), + pwm_ctl | BXT_BLC_PWM_ENABLE); +} + +static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state, + const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 pwm_ctl; + + pwm_ctl = intel_de_read(dev_priv, + BXT_BLC_PWM_CTL(panel->backlight.controller)); + if (pwm_ctl & BXT_BLC_PWM_ENABLE) { + drm_dbg_kms(&dev_priv->drm, "backlight already enabled\n"); + pwm_ctl &= ~BXT_BLC_PWM_ENABLE; + intel_de_write(dev_priv, + BXT_BLC_PWM_CTL(panel->backlight.controller), + pwm_ctl); + } + + intel_de_write(dev_priv, + BXT_BLC_PWM_FREQ(panel->backlight.controller), + panel->backlight.pwm_level_max); + + intel_backlight_set_pwm_level(conn_state, level); + + pwm_ctl = 0; + if (panel->backlight.active_low_pwm) + pwm_ctl |= BXT_BLC_PWM_POLARITY; + + intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller), + pwm_ctl); + intel_de_posting_read(dev_priv, + BXT_BLC_PWM_CTL(panel->backlight.controller)); + intel_de_write(dev_priv, BXT_BLC_PWM_CTL(panel->backlight.controller), + pwm_ctl | BXT_BLC_PWM_ENABLE); +} + +static void ext_pwm_enable_backlight(const struct intel_crtc_state *crtc_state, + const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct intel_panel *panel = &connector->panel; + + pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100); + panel->backlight.pwm_state.enabled = true; + pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state); +} + +static void __intel_backlight_enable(const struct intel_crtc_state *crtc_state, + const struct drm_connector_state *conn_state) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct intel_panel *panel = &connector->panel; + + WARN_ON(panel->backlight.max == 0); + + if (panel->backlight.level <= panel->backlight.min) { + panel->backlight.level = panel->backlight.max; + if (panel->backlight.device) + panel->backlight.device->props.brightness = + scale_hw_to_user(connector, + panel->backlight.level, + panel->backlight.device->props.max_brightness); + } + + panel->backlight.funcs->enable(crtc_state, conn_state, panel->backlight.level); + panel->backlight.enabled = true; + if (panel->backlight.device) + panel->backlight.device->props.power = FB_BLANK_UNBLANK; +} + +void intel_backlight_enable(const struct intel_crtc_state *crtc_state, + const struct drm_connector_state *conn_state) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe; + + if (!panel->backlight.present) + return; + + drm_dbg_kms(&dev_priv->drm, "pipe %c\n", pipe_name(pipe)); + + mutex_lock(&dev_priv->backlight_lock); + + __intel_backlight_enable(crtc_state, conn_state); + + mutex_unlock(&dev_priv->backlight_lock); +} + +#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE) +static u32 intel_panel_get_backlight(struct intel_connector *connector) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 val = 0; + + mutex_lock(&dev_priv->backlight_lock); + + if (panel->backlight.enabled) + val = panel->backlight.funcs->get(connector, intel_connector_get_pipe(connector)); + + mutex_unlock(&dev_priv->backlight_lock); + + drm_dbg_kms(&dev_priv->drm, "get backlight PWM = %d\n", val); + return val; +} + +/* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */ +static u32 scale_user_to_hw(struct intel_connector *connector, + u32 user_level, u32 user_max) +{ + struct intel_panel *panel = &connector->panel; + + return scale(user_level, 0, user_max, + panel->backlight.min, panel->backlight.max); +} + +/* set backlight brightness to level in range [0..max], scaling wrt hw min */ +static void intel_panel_set_backlight(const struct drm_connector_state *conn_state, + u32 user_level, u32 user_max) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 hw_level; + + if (!panel->backlight.present) + return; + + mutex_lock(&dev_priv->backlight_lock); + + drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0); + + hw_level = scale_user_to_hw(connector, user_level, user_max); + panel->backlight.level = hw_level; + + if (panel->backlight.enabled) + intel_panel_actually_set_backlight(conn_state, hw_level); + + mutex_unlock(&dev_priv->backlight_lock); +} + +static int intel_backlight_device_update_status(struct backlight_device *bd) +{ + struct intel_connector *connector = bl_get_data(bd); + struct intel_panel *panel = &connector->panel; + struct drm_device *dev = connector->base.dev; + + drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); + DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n", + bd->props.brightness, bd->props.max_brightness); + intel_panel_set_backlight(connector->base.state, bd->props.brightness, + bd->props.max_brightness); + + /* + * Allow flipping bl_power as a sub-state of enabled. Sadly the + * backlight class device does not make it easy to differentiate + * between callbacks for brightness and bl_power, so our backlight_power + * callback needs to take this into account. + */ + if (panel->backlight.enabled) { + if (panel->backlight.power) { + bool enable = bd->props.power == FB_BLANK_UNBLANK && + bd->props.brightness != 0; + panel->backlight.power(connector, enable); + } + } else { + bd->props.power = FB_BLANK_POWERDOWN; + } + + drm_modeset_unlock(&dev->mode_config.connection_mutex); + return 0; +} + +static int intel_backlight_device_get_brightness(struct backlight_device *bd) +{ + struct intel_connector *connector = bl_get_data(bd); + struct drm_device *dev = connector->base.dev; + struct drm_i915_private *dev_priv = to_i915(dev); + intel_wakeref_t wakeref; + int ret = 0; + + with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref) { + u32 hw_level; + + drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); + + hw_level = intel_panel_get_backlight(connector); + ret = scale_hw_to_user(connector, + hw_level, bd->props.max_brightness); + + drm_modeset_unlock(&dev->mode_config.connection_mutex); + } + + return ret; +} + +static const struct backlight_ops intel_backlight_device_ops = { + .update_status = intel_backlight_device_update_status, + .get_brightness = intel_backlight_device_get_brightness, +}; + +int intel_backlight_device_register(struct intel_connector *connector) +{ + struct drm_i915_private *i915 = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + struct backlight_properties props; + struct backlight_device *bd; + const char *name; + int ret = 0; + + if (WARN_ON(panel->backlight.device)) + return -ENODEV; + + if (!panel->backlight.present) + return 0; + + WARN_ON(panel->backlight.max == 0); + + memset(&props, 0, sizeof(props)); + props.type = BACKLIGHT_RAW; + + /* + * Note: Everything should work even if the backlight device max + * presented to the userspace is arbitrarily chosen. + */ + props.max_brightness = panel->backlight.max; + props.brightness = scale_hw_to_user(connector, + panel->backlight.level, + props.max_brightness); + + if (panel->backlight.enabled) + props.power = FB_BLANK_UNBLANK; + else + props.power = FB_BLANK_POWERDOWN; + + name = kstrdup("intel_backlight", GFP_KERNEL); + if (!name) + return -ENOMEM; + + bd = backlight_device_register(name, connector->base.kdev, connector, + &intel_backlight_device_ops, &props); + + /* + * Using the same name independent of the drm device or connector + * prevents registration of multiple backlight devices in the + * driver. However, we need to use the default name for backward + * compatibility. Use unique names for subsequent backlight devices as a + * fallback when the default name already exists. + */ + if (IS_ERR(bd) && PTR_ERR(bd) == -EEXIST) { + kfree(name); + name = kasprintf(GFP_KERNEL, "card%d-%s-backlight", + i915->drm.primary->index, connector->base.name); + if (!name) + return -ENOMEM; + + bd = backlight_device_register(name, connector->base.kdev, connector, + &intel_backlight_device_ops, &props); + } + + if (IS_ERR(bd)) { + drm_err(&i915->drm, + "[CONNECTOR:%d:%s] backlight device %s register failed: %ld\n", + connector->base.base.id, connector->base.name, name, PTR_ERR(bd)); + ret = PTR_ERR(bd); + goto out; + } + + panel->backlight.device = bd; + + drm_dbg_kms(&i915->drm, + "[CONNECTOR:%d:%s] backlight device %s registered\n", + connector->base.base.id, connector->base.name, name); + +out: + kfree(name); + + return ret; +} + +void intel_backlight_device_unregister(struct intel_connector *connector) +{ + struct intel_panel *panel = &connector->panel; + + if (panel->backlight.device) { + backlight_device_unregister(panel->backlight.device); + panel->backlight.device = NULL; + } +} +#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */ + +/* + * CNP: PWM clock frequency is 19.2 MHz or 24 MHz. + * PWM increment = 1 + */ +static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + + return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq), + pwm_freq_hz); +} + +/* + * BXT: PWM clock frequency = 19.2 MHz. + */ +static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz) +{ + return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz); +} + +/* + * SPT: This value represents the period of the PWM stream in clock periods + * multiplied by 16 (default increment) or 128 (alternate increment selected in + * SCHICKEN_1 bit 0). PWM clock is 24 MHz. + */ +static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz) +{ + struct intel_panel *panel = &connector->panel; + u32 mul; + + if (panel->backlight.alternate_pwm_increment) + mul = 128; + else + mul = 16; + + return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul); +} + +/* + * LPT: This value represents the period of the PWM stream in clock periods + * multiplied by 128 (default increment) or 16 (alternate increment, selected in + * LPT SOUTH_CHICKEN2 register bit 5). + */ +static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 mul, clock; + + if (panel->backlight.alternate_pwm_increment) + mul = 16; + else + mul = 128; + + if (HAS_PCH_LPT_H(dev_priv)) + clock = MHz(135); /* LPT:H */ + else + clock = MHz(24); /* LPT:LP */ + + return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul); +} + +/* + * ILK/SNB/IVB: This value represents the period of the PWM stream in PCH + * display raw clocks multiplied by 128. + */ +static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + + return DIV_ROUND_CLOSEST(KHz(RUNTIME_INFO(dev_priv)->rawclk_freq), + pwm_freq_hz * 128); +} + +/* + * Gen2: This field determines the number of time base events (display core + * clock frequency/32) in total for a complete cycle of modulated backlight + * control. + * + * Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock) + * divided by 32. + */ +static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + int clock; + + if (IS_PINEVIEW(dev_priv)) + clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq); + else + clock = KHz(dev_priv->cdclk.hw.cdclk); + + return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32); +} + +/* + * Gen4: This value represents the period of the PWM stream in display core + * clocks ([DevCTG] HRAW clocks) multiplied by 128. + * + */ +static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + int clock; + + if (IS_G4X(dev_priv)) + clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq); + else + clock = KHz(dev_priv->cdclk.hw.cdclk); + + return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128); +} + +/* + * VLV: This value represents the period of the PWM stream in display core + * clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks + * multiplied by 16. CHV uses a 19.2MHz S0IX clock. + */ +static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + int mul, clock; + + if ((intel_de_read(dev_priv, CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) { + if (IS_CHERRYVIEW(dev_priv)) + clock = KHz(19200); + else + clock = MHz(25); + mul = 16; + } else { + clock = KHz(RUNTIME_INFO(dev_priv)->rawclk_freq); + mul = 128; + } + + return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul); +} + +static u16 get_vbt_pwm_freq(struct drm_i915_private *dev_priv) +{ + u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz; + + if (pwm_freq_hz) { + drm_dbg_kms(&dev_priv->drm, + "VBT defined backlight frequency %u Hz\n", + pwm_freq_hz); + } else { + pwm_freq_hz = 200; + drm_dbg_kms(&dev_priv->drm, + "default backlight frequency %u Hz\n", + pwm_freq_hz); + } + + return pwm_freq_hz; +} + +static u32 get_backlight_max_vbt(struct intel_connector *connector) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u16 pwm_freq_hz = get_vbt_pwm_freq(dev_priv); + u32 pwm; + + if (!panel->backlight.pwm_funcs->hz_to_pwm) { + drm_dbg_kms(&dev_priv->drm, + "backlight frequency conversion not supported\n"); + return 0; + } + + pwm = panel->backlight.pwm_funcs->hz_to_pwm(connector, pwm_freq_hz); + if (!pwm) { + drm_dbg_kms(&dev_priv->drm, + "backlight frequency conversion failed\n"); + return 0; + } + + return pwm; +} + +/* + * Note: The setup hooks can't assume pipe is set! + */ +static u32 get_backlight_min_vbt(struct intel_connector *connector) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + int min; + + drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_level_max == 0); + + /* + * XXX: If the vbt value is 255, it makes min equal to max, which leads + * to problems. There are such machines out there. Either our + * interpretation is wrong or the vbt has bogus data. Or both. Safeguard + * against this by letting the minimum be at most (arbitrarily chosen) + * 25% of the max. + */ + min = clamp_t(int, dev_priv->vbt.backlight.min_brightness, 0, 64); + if (min != dev_priv->vbt.backlight.min_brightness) { + drm_dbg_kms(&dev_priv->drm, + "clamping VBT min backlight %d/255 to %d/255\n", + dev_priv->vbt.backlight.min_brightness, min); + } + + /* vbt value is a coefficient in range [0..255] */ + return scale(min, 0, 255, 0, panel->backlight.pwm_level_max); +} + +static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 cpu_ctl2, pch_ctl1, pch_ctl2, val; + bool alt, cpu_mode; + + if (HAS_PCH_LPT(dev_priv)) + alt = intel_de_read(dev_priv, SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY; + else + alt = intel_de_read(dev_priv, SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY; + panel->backlight.alternate_pwm_increment = alt; + + pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1); + panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY; + + pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2); + panel->backlight.pwm_level_max = pch_ctl2 >> 16; + + cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2); + + if (!panel->backlight.pwm_level_max) + panel->backlight.pwm_level_max = get_backlight_max_vbt(connector); + + if (!panel->backlight.pwm_level_max) + return -ENODEV; + + panel->backlight.pwm_level_min = get_backlight_min_vbt(connector); + + panel->backlight.pwm_enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE; + + cpu_mode = panel->backlight.pwm_enabled && HAS_PCH_LPT(dev_priv) && + !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) && + (cpu_ctl2 & BLM_PWM_ENABLE); + + if (cpu_mode) { + val = pch_get_backlight(connector, unused); + + drm_dbg_kms(&dev_priv->drm, + "CPU backlight register was enabled, switching to PCH override\n"); + + /* Write converted CPU PWM value to PCH override register */ + lpt_set_backlight(connector->base.state, val); + intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, + pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE); + + intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, + cpu_ctl2 & ~BLM_PWM_ENABLE); + } + + return 0; +} + +static int pch_setup_backlight(struct intel_connector *connector, enum pipe unused) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 cpu_ctl2, pch_ctl1, pch_ctl2; + + pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1); + panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY; + + pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2); + panel->backlight.pwm_level_max = pch_ctl2 >> 16; + + if (!panel->backlight.pwm_level_max) + panel->backlight.pwm_level_max = get_backlight_max_vbt(connector); + + if (!panel->backlight.pwm_level_max) + return -ENODEV; + + panel->backlight.pwm_level_min = get_backlight_min_vbt(connector); + + cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2); + panel->backlight.pwm_enabled = (cpu_ctl2 & BLM_PWM_ENABLE) && + (pch_ctl1 & BLM_PCH_PWM_ENABLE); + + return 0; +} + +static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unused) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 ctl, val; + + ctl = intel_de_read(dev_priv, BLC_PWM_CTL); + + if (DISPLAY_VER(dev_priv) == 2 || IS_I915GM(dev_priv) || IS_I945GM(dev_priv)) + panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE; + + if (IS_PINEVIEW(dev_priv)) + panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV; + + panel->backlight.pwm_level_max = ctl >> 17; + + if (!panel->backlight.pwm_level_max) { + panel->backlight.pwm_level_max = get_backlight_max_vbt(connector); + panel->backlight.pwm_level_max >>= 1; + } + + if (!panel->backlight.pwm_level_max) + return -ENODEV; + + if (panel->backlight.combination_mode) + panel->backlight.pwm_level_max *= 0xff; + + panel->backlight.pwm_level_min = get_backlight_min_vbt(connector); + + val = i9xx_get_backlight(connector, unused); + val = intel_backlight_invert_pwm_level(connector, val); + val = clamp(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max); + + panel->backlight.pwm_enabled = val != 0; + + return 0; +} + +static int i965_setup_backlight(struct intel_connector *connector, enum pipe unused) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 ctl, ctl2; + + ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2); + panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE; + panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965; + + ctl = intel_de_read(dev_priv, BLC_PWM_CTL); + panel->backlight.pwm_level_max = ctl >> 16; + + if (!panel->backlight.pwm_level_max) + panel->backlight.pwm_level_max = get_backlight_max_vbt(connector); + + if (!panel->backlight.pwm_level_max) + return -ENODEV; + + if (panel->backlight.combination_mode) + panel->backlight.pwm_level_max *= 0xff; + + panel->backlight.pwm_level_min = get_backlight_min_vbt(connector); + + panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE; + + return 0; +} + +static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 ctl, ctl2; + + if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B)) + return -ENODEV; + + ctl2 = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe)); + panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965; + + ctl = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe)); + panel->backlight.pwm_level_max = ctl >> 16; + + if (!panel->backlight.pwm_level_max) + panel->backlight.pwm_level_max = get_backlight_max_vbt(connector); + + if (!panel->backlight.pwm_level_max) + return -ENODEV; + + panel->backlight.pwm_level_min = get_backlight_min_vbt(connector); + + panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE; + + return 0; +} + +static int +bxt_setup_backlight(struct intel_connector *connector, enum pipe unused) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 pwm_ctl, val; + + panel->backlight.controller = dev_priv->vbt.backlight.controller; + + pwm_ctl = intel_de_read(dev_priv, + BXT_BLC_PWM_CTL(panel->backlight.controller)); + + /* Controller 1 uses the utility pin. */ + if (panel->backlight.controller == 1) { + val = intel_de_read(dev_priv, UTIL_PIN_CTL); + panel->backlight.util_pin_active_low = + val & UTIL_PIN_POLARITY; + } + + panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY; + panel->backlight.pwm_level_max = + intel_de_read(dev_priv, BXT_BLC_PWM_FREQ(panel->backlight.controller)); + + if (!panel->backlight.pwm_level_max) + panel->backlight.pwm_level_max = get_backlight_max_vbt(connector); + + if (!panel->backlight.pwm_level_max) + return -ENODEV; + + panel->backlight.pwm_level_min = get_backlight_min_vbt(connector); + + panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE; + + return 0; +} + +static int +cnp_setup_backlight(struct intel_connector *connector, enum pipe unused) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 pwm_ctl; + + /* + * CNP has the BXT implementation of backlight, but with only one + * controller. TODO: ICP has multiple controllers but we only use + * controller 0 for now. + */ + panel->backlight.controller = 0; + + pwm_ctl = intel_de_read(dev_priv, + BXT_BLC_PWM_CTL(panel->backlight.controller)); + + panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY; + panel->backlight.pwm_level_max = + intel_de_read(dev_priv, BXT_BLC_PWM_FREQ(panel->backlight.controller)); + + if (!panel->backlight.pwm_level_max) + panel->backlight.pwm_level_max = get_backlight_max_vbt(connector); + + if (!panel->backlight.pwm_level_max) + return -ENODEV; + + panel->backlight.pwm_level_min = get_backlight_min_vbt(connector); + + panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE; + + return 0; +} + +static int ext_pwm_setup_backlight(struct intel_connector *connector, + enum pipe pipe) +{ + struct drm_device *dev = connector->base.dev; + struct drm_i915_private *dev_priv = to_i915(dev); + struct intel_panel *panel = &connector->panel; + const char *desc; + u32 level; + + /* Get the right PWM chip for DSI backlight according to VBT */ + if (dev_priv->vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) { + panel->backlight.pwm = pwm_get(dev->dev, "pwm_pmic_backlight"); + desc = "PMIC"; + } else { + panel->backlight.pwm = pwm_get(dev->dev, "pwm_soc_backlight"); + desc = "SoC"; + } + + if (IS_ERR(panel->backlight.pwm)) { + drm_err(&dev_priv->drm, "Failed to get the %s PWM chip\n", + desc); + panel->backlight.pwm = NULL; + return -ENODEV; + } + + panel->backlight.pwm_level_max = 100; /* 100% */ + panel->backlight.pwm_level_min = get_backlight_min_vbt(connector); + + if (pwm_is_enabled(panel->backlight.pwm)) { + /* PWM is already enabled, use existing settings */ + pwm_get_state(panel->backlight.pwm, &panel->backlight.pwm_state); + + level = pwm_get_relative_duty_cycle(&panel->backlight.pwm_state, + 100); + level = intel_backlight_invert_pwm_level(connector, level); + panel->backlight.pwm_enabled = true; + + drm_dbg_kms(&dev_priv->drm, "PWM already enabled at freq %ld, VBT freq %d, level %d\n", + NSEC_PER_SEC / (unsigned long)panel->backlight.pwm_state.period, + get_vbt_pwm_freq(dev_priv), level); + } else { + /* Set period from VBT frequency, leave other settings at 0. */ + panel->backlight.pwm_state.period = + NSEC_PER_SEC / get_vbt_pwm_freq(dev_priv); + } + + drm_info(&dev_priv->drm, "Using %s PWM for LCD backlight control\n", + desc); + return 0; +} + +static void intel_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct intel_panel *panel = &connector->panel; + + panel->backlight.pwm_funcs->set(conn_state, + intel_backlight_invert_pwm_level(connector, level)); +} + +static u32 intel_pwm_get_backlight(struct intel_connector *connector, enum pipe pipe) +{ + struct intel_panel *panel = &connector->panel; + + return intel_backlight_invert_pwm_level(connector, + panel->backlight.pwm_funcs->get(connector, pipe)); +} + +static void intel_pwm_enable_backlight(const struct intel_crtc_state *crtc_state, + const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct intel_panel *panel = &connector->panel; + + panel->backlight.pwm_funcs->enable(crtc_state, conn_state, + intel_backlight_invert_pwm_level(connector, level)); +} + +static void intel_pwm_disable_backlight(const struct drm_connector_state *conn_state, u32 level) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct intel_panel *panel = &connector->panel; + + panel->backlight.pwm_funcs->disable(conn_state, + intel_backlight_invert_pwm_level(connector, level)); +} + +static int intel_pwm_setup_backlight(struct intel_connector *connector, enum pipe pipe) +{ + struct intel_panel *panel = &connector->panel; + int ret = panel->backlight.pwm_funcs->setup(connector, pipe); + + if (ret < 0) + return ret; + + panel->backlight.min = panel->backlight.pwm_level_min; + panel->backlight.max = panel->backlight.pwm_level_max; + panel->backlight.level = intel_pwm_get_backlight(connector, pipe); + panel->backlight.enabled = panel->backlight.pwm_enabled; + + return 0; +} + +void intel_backlight_update(struct intel_atomic_state *state, + struct intel_encoder *encoder, + const struct intel_crtc_state *crtc_state, + const struct drm_connector_state *conn_state) +{ + struct intel_connector *connector = to_intel_connector(conn_state->connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + + if (!panel->backlight.present) + return; + + mutex_lock(&dev_priv->backlight_lock); + if (!panel->backlight.enabled) + __intel_backlight_enable(crtc_state, conn_state); + + mutex_unlock(&dev_priv->backlight_lock); +} + +int intel_backlight_setup(struct intel_connector *connector, enum pipe pipe) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + int ret; + + if (!dev_priv->vbt.backlight.present) { + if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) { + drm_dbg_kms(&dev_priv->drm, + "no backlight present per VBT, but present per quirk\n"); + } else { + drm_dbg_kms(&dev_priv->drm, + "no backlight present per VBT\n"); + return 0; + } + } + + /* ensure intel_panel has been initialized first */ + if (drm_WARN_ON(&dev_priv->drm, !panel->backlight.funcs)) + return -ENODEV; + + /* set level and max in panel struct */ + mutex_lock(&dev_priv->backlight_lock); + ret = panel->backlight.funcs->setup(connector, pipe); + mutex_unlock(&dev_priv->backlight_lock); + + if (ret) { + drm_dbg_kms(&dev_priv->drm, + "failed to setup backlight for connector %s\n", + connector->base.name); + return ret; + } + + panel->backlight.present = true; + + drm_dbg_kms(&dev_priv->drm, + "Connector %s backlight initialized, %s, brightness %u/%u\n", + connector->base.name, + enableddisabled(panel->backlight.enabled), + panel->backlight.level, panel->backlight.max); + + return 0; +} + +void intel_backlight_destroy(struct intel_panel *panel) +{ + /* dispose of the pwm */ + if (panel->backlight.pwm) + pwm_put(panel->backlight.pwm); + + panel->backlight.present = false; +} + +static const struct intel_panel_bl_funcs bxt_pwm_funcs = { + .setup = bxt_setup_backlight, + .enable = bxt_enable_backlight, + .disable = bxt_disable_backlight, + .set = bxt_set_backlight, + .get = bxt_get_backlight, + .hz_to_pwm = bxt_hz_to_pwm, +}; + +static const struct intel_panel_bl_funcs cnp_pwm_funcs = { + .setup = cnp_setup_backlight, + .enable = cnp_enable_backlight, + .disable = cnp_disable_backlight, + .set = bxt_set_backlight, + .get = bxt_get_backlight, + .hz_to_pwm = cnp_hz_to_pwm, +}; + +static const struct intel_panel_bl_funcs lpt_pwm_funcs = { + .setup = lpt_setup_backlight, + .enable = lpt_enable_backlight, + .disable = lpt_disable_backlight, + .set = lpt_set_backlight, + .get = lpt_get_backlight, + .hz_to_pwm = lpt_hz_to_pwm, +}; + +static const struct intel_panel_bl_funcs spt_pwm_funcs = { + .setup = lpt_setup_backlight, + .enable = lpt_enable_backlight, + .disable = lpt_disable_backlight, + .set = lpt_set_backlight, + .get = lpt_get_backlight, + .hz_to_pwm = spt_hz_to_pwm, +}; + +static const struct intel_panel_bl_funcs pch_pwm_funcs = { + .setup = pch_setup_backlight, + .enable = pch_enable_backlight, + .disable = pch_disable_backlight, + .set = pch_set_backlight, + .get = pch_get_backlight, + .hz_to_pwm = pch_hz_to_pwm, +}; + +static const struct intel_panel_bl_funcs ext_pwm_funcs = { + .setup = ext_pwm_setup_backlight, + .enable = ext_pwm_enable_backlight, + .disable = ext_pwm_disable_backlight, + .set = ext_pwm_set_backlight, + .get = ext_pwm_get_backlight, +}; + +static const struct intel_panel_bl_funcs vlv_pwm_funcs = { + .setup = vlv_setup_backlight, + .enable = vlv_enable_backlight, + .disable = vlv_disable_backlight, + .set = vlv_set_backlight, + .get = vlv_get_backlight, + .hz_to_pwm = vlv_hz_to_pwm, +}; + +static const struct intel_panel_bl_funcs i965_pwm_funcs = { + .setup = i965_setup_backlight, + .enable = i965_enable_backlight, + .disable = i965_disable_backlight, + .set = i9xx_set_backlight, + .get = i9xx_get_backlight, + .hz_to_pwm = i965_hz_to_pwm, +}; + +static const struct intel_panel_bl_funcs i9xx_pwm_funcs = { + .setup = i9xx_setup_backlight, + .enable = i9xx_enable_backlight, + .disable = i9xx_disable_backlight, + .set = i9xx_set_backlight, + .get = i9xx_get_backlight, + .hz_to_pwm = i9xx_hz_to_pwm, +}; + +static const struct intel_panel_bl_funcs pwm_bl_funcs = { + .setup = intel_pwm_setup_backlight, + .enable = intel_pwm_enable_backlight, + .disable = intel_pwm_disable_backlight, + .set = intel_pwm_set_backlight, + .get = intel_pwm_get_backlight, +}; + +/* Set up chip specific backlight functions */ +void intel_backlight_init_funcs(struct intel_panel *panel) +{ + struct intel_connector *connector = + container_of(panel, struct intel_connector, panel); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + + if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI && + intel_dsi_dcs_init_backlight_funcs(connector) == 0) + return; + + if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) { + panel->backlight.pwm_funcs = &bxt_pwm_funcs; + } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP) { + panel->backlight.pwm_funcs = &cnp_pwm_funcs; + } else if (INTEL_PCH_TYPE(dev_priv) >= PCH_LPT) { + if (HAS_PCH_LPT(dev_priv)) + panel->backlight.pwm_funcs = &lpt_pwm_funcs; + else + panel->backlight.pwm_funcs = &spt_pwm_funcs; + } else if (HAS_PCH_SPLIT(dev_priv)) { + panel->backlight.pwm_funcs = &pch_pwm_funcs; + } else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) { + if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) { + panel->backlight.pwm_funcs = &ext_pwm_funcs; + } else { + panel->backlight.pwm_funcs = &vlv_pwm_funcs; + } + } else if (DISPLAY_VER(dev_priv) == 4) { + panel->backlight.pwm_funcs = &i965_pwm_funcs; + } else { + panel->backlight.pwm_funcs = &i9xx_pwm_funcs; + } + + if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP && + intel_dp_aux_init_backlight_funcs(connector) == 0) + return; + + /* We're using a standard PWM backlight interface */ + panel->backlight.funcs = &pwm_bl_funcs; +} |