diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_opregion.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_opregion.c | 56 |
1 files changed, 55 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_opregion.c b/drivers/gpu/drm/i915/display/intel_opregion.c index 0065111593a6..af9d30f56cc1 100644 --- a/drivers/gpu/drm/i915/display/intel_opregion.c +++ b/drivers/gpu/drm/i915/display/intel_opregion.c @@ -35,6 +35,7 @@ #include "intel_backlight.h" #include "intel_display_types.h" #include "intel_opregion.h" +#include "intel_pci_config.h" #define OPREGION_HEADER_OFFSET 0 #define OPREGION_ACPI_OFFSET 0x100 @@ -195,6 +196,8 @@ struct opregion_asle_ext { #define ASLE_IUER_WINDOWS_BTN (1 << 1) #define ASLE_IUER_POWER_BTN (1 << 0) +#define ASLE_PHED_EDID_VALID_MASK 0x3 + /* Software System Control Interrupt (SWSCI) */ #define SWSCI_SCIC_INDICATOR (1 << 0) #define SWSCI_SCIC_MAIN_FUNCTION_SHIFT 1 @@ -908,8 +911,10 @@ int intel_opregion_setup(struct drm_i915_private *dev_priv) opregion->asle->ardy = ASLE_ARDY_NOT_READY; } - if (mboxes & MBOX_ASLE_EXT) + if (mboxes & MBOX_ASLE_EXT) { drm_dbg(&dev_priv->drm, "ASLE extension supported\n"); + opregion->asle_ext = base + OPREGION_ASLE_EXT_OFFSET; + } if (intel_load_vbt_firmware(dev_priv) == 0) goto out; @@ -1036,6 +1041,54 @@ intel_opregion_get_panel_type(struct drm_i915_private *dev_priv) return ret - 1; } +/** + * intel_opregion_get_edid - Fetch EDID from ACPI OpRegion mailbox #5 + * @intel_connector: eDP connector + * + * This reads the ACPI Opregion mailbox #5 to extract the EDID that is passed + * to it. + * + * Returns: + * The EDID in the OpRegion, or NULL if there is none or it's invalid. + * + */ +struct edid *intel_opregion_get_edid(struct intel_connector *intel_connector) +{ + struct drm_connector *connector = &intel_connector->base; + struct drm_i915_private *i915 = to_i915(connector->dev); + struct intel_opregion *opregion = &i915->opregion; + const void *in_edid; + const struct edid *edid; + struct edid *new_edid; + int len; + + if (!opregion->asle_ext) + return NULL; + + in_edid = opregion->asle_ext->bddc; + + /* Validity corresponds to number of 128-byte blocks */ + len = (opregion->asle_ext->phed & ASLE_PHED_EDID_VALID_MASK) * 128; + if (!len || !memchr_inv(in_edid, 0, len)) + return NULL; + + edid = in_edid; + + if (len < EDID_LENGTH * (1 + edid->extensions)) { + drm_dbg_kms(&i915->drm, "Invalid EDID in ACPI OpRegion (Mailbox #5): too short\n"); + return NULL; + } + new_edid = drm_edid_duplicate(edid); + if (!new_edid) + return NULL; + if (!drm_edid_is_valid(new_edid)) { + kfree(new_edid); + drm_dbg_kms(&i915->drm, "Invalid EDID in ACPI OpRegion (Mailbox #5)\n"); + return NULL; + } + return new_edid; +} + void intel_opregion_register(struct drm_i915_private *i915) { struct intel_opregion *opregion = &i915->opregion; @@ -1129,6 +1182,7 @@ void intel_opregion_unregister(struct drm_i915_private *i915) opregion->acpi = NULL; opregion->swsci = NULL; opregion->asle = NULL; + opregion->asle_ext = NULL; opregion->vbt = NULL; opregion->lid_state = NULL; } |