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path: root/drivers/gpu/drm/i915/icl_dsi.c
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Diffstat (limited to 'drivers/gpu/drm/i915/icl_dsi.c')
-rw-r--r--drivers/gpu/drm/i915/icl_dsi.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c
new file mode 100644
index 000000000000..13830e43a4d1
--- /dev/null
+++ b/drivers/gpu/drm/i915/icl_dsi.c
@@ -0,0 +1,127 @@
+/*
+ * Copyright © 2018 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ * Madhav Chauhan <madhav.chauhan@intel.com>
+ * Jani Nikula <jani.nikula@intel.com>
+ */
+
+#include "intel_dsi.h"
+
+static void gen11_dsi_program_esc_clk_div(struct intel_encoder *encoder)
+{
+ struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+ struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+ enum port port;
+ u32 bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
+ u32 afe_clk_khz; /* 8X Clock */
+ u32 esc_clk_div_m;
+
+ afe_clk_khz = DIV_ROUND_CLOSEST(intel_dsi->pclk * bpp,
+ intel_dsi->lane_count);
+
+ esc_clk_div_m = DIV_ROUND_UP(afe_clk_khz, DSI_MAX_ESC_CLK);
+
+ for_each_dsi_port(port, intel_dsi->ports) {
+ I915_WRITE(ICL_DSI_ESC_CLK_DIV(port),
+ esc_clk_div_m & ICL_ESC_CLK_DIV_MASK);
+ POSTING_READ(ICL_DSI_ESC_CLK_DIV(port));
+ }
+
+ for_each_dsi_port(port, intel_dsi->ports) {
+ I915_WRITE(ICL_DPHY_ESC_CLK_DIV(port),
+ esc_clk_div_m & ICL_ESC_CLK_DIV_MASK);
+ POSTING_READ(ICL_DPHY_ESC_CLK_DIV(port));
+ }
+}
+
+static void gen11_dsi_enable_io_power(struct intel_encoder *encoder)
+{
+ struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+ struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+ enum port port;
+ u32 tmp;
+
+ for_each_dsi_port(port, intel_dsi->ports) {
+ tmp = I915_READ(ICL_DSI_IO_MODECTL(port));
+ tmp |= COMBO_PHY_MODE_DSI;
+ I915_WRITE(ICL_DSI_IO_MODECTL(port), tmp);
+ }
+
+ for_each_dsi_port(port, intel_dsi->ports) {
+ intel_display_power_get(dev_priv, port == PORT_A ?
+ POWER_DOMAIN_PORT_DDI_A_IO :
+ POWER_DOMAIN_PORT_DDI_B_IO);
+ }
+}
+
+static void gen11_dsi_power_up_lanes(struct intel_encoder *encoder)
+{
+ struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+ struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+ enum port port;
+ u32 tmp;
+ u32 lane_mask;
+
+ switch (intel_dsi->lane_count) {
+ case 1:
+ lane_mask = PWR_DOWN_LN_3_1_0;
+ break;
+ case 2:
+ lane_mask = PWR_DOWN_LN_3_1;
+ break;
+ case 3:
+ lane_mask = PWR_DOWN_LN_3;
+ break;
+ case 4:
+ default:
+ lane_mask = PWR_UP_ALL_LANES;
+ break;
+ }
+
+ for_each_dsi_port(port, intel_dsi->ports) {
+ tmp = I915_READ(ICL_PORT_CL_DW10(port));
+ tmp &= ~PWR_DOWN_LN_MASK;
+ I915_WRITE(ICL_PORT_CL_DW10(port), tmp | lane_mask);
+ }
+}
+
+static void gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder)
+{
+ /* step 4a: power up all lanes of the DDI used by DSI */
+ gen11_dsi_power_up_lanes(encoder);
+}
+
+static void __attribute__((unused))
+gen11_dsi_pre_enable(struct intel_encoder *encoder,
+ const struct intel_crtc_state *pipe_config,
+ const struct drm_connector_state *conn_state)
+{
+ /* step2: enable IO power */
+ gen11_dsi_enable_io_power(encoder);
+
+ /* step3: enable DSI PLL */
+ gen11_dsi_program_esc_clk_div(encoder);
+
+ /* step4: enable DSI port and DPHY */
+ gen11_dsi_enable_port_and_phy(encoder);
+}