drm/i915/bxt: Disable device ready before shutdown command

Disable device ready before MIPI port shutdown command.
This helps to avoid mipi split screen issues.

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Vidya Srinivas <vidya.srinivas@intel.com>
Reviewed-by: Bob Paauwe <bob.j.paauwe@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1486551058-22596-8-git-send-email-vidya.srinivas@intel.com

diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index e7e823d0044499393d42972d2480ea5fb7641f42..c26fe4fc081982ae96a35e5bf9da4c158fe37433 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -612,6 +612,8 @@ static void intel_dsi_pre_disable(struct intel_encoder *encoder,
                                  struct intel_crtc_state *old_crtc_state,
                                  struct drm_connector_state *old_conn_state)
 {
+       struct drm_device *dev = encoder->base.dev;
+       struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
        enum port port;
 
@@ -619,6 +621,15 @@ static void intel_dsi_pre_disable(struct intel_encoder *encoder,
 
        intel_panel_disable_backlight(intel_dsi->attached_connector);
 
+       /*
+        * Disable Device ready before the port shutdown in order
+        * to avoid split screen
+        */
+       if (IS_BROXTON(dev_priv)) {
+               for_each_dsi_port(port, intel_dsi->ports)
+                       I915_WRITE(MIPI_DEVICE_READY(port), 0);
+       }
+
        if (is_vid_mode(intel_dsi)) {
                /* Send Shutdown command to the panel in LP mode */
                for_each_dsi_port(port, intel_dsi->ports)