drm/i915/icl: Enable DSI IO power

This patch configures mode of operation for DSI
and enable DDI IO power by configuring power well.

v2: Use for_each_dsi_port() for power get (Jani N)

Signed-off-by: Madhav Chauhan <madhav.chauhan@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1530798591-2077-5-git-send-email-madhav.chauhan@intel.com

diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c
index 1eb4ac3..774ab26 100644 (file)
--- a/drivers/gpu/drm/i915/icl_dsi.c
+++ b/drivers/gpu/drm/i915/icl_dsi.c
@@ -54,11 +54,34 @@ static void gen11_dsi_program_esc_clk_div(struct intel_encoder *encoder)
        }
 }
 
+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 __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);
 }