drm/i915/icl: Disable DSI ports

This patch disables both DSI ports by writing to
DDI_BUF_CTL registers as part of DSI encoder disable
sequence.

Signed-off-by: Madhav Chauhan <madhav.chauhan@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/be9a7dc1ed89ad38679c67ff1c1552f0b4604494.1540900289.git.jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c
index 71092f1..4469684 100644 (file)
--- a/drivers/gpu/drm/i915/icl_dsi.c
+++ b/drivers/gpu/drm/i915/icl_dsi.c
@@ -853,6 +853,26 @@ static void gen11_dsi_deconfigure_trancoder(struct intel_encoder *encoder)
        }
 }
 
+static void gen11_dsi_disable_port(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);
+       u32 tmp;
+       enum port port;
+
+       for_each_dsi_port(port, intel_dsi->ports) {
+               tmp = I915_READ(DDI_BUF_CTL(port));
+               tmp &= ~DDI_BUF_CTL_ENABLE;
+               I915_WRITE(DDI_BUF_CTL(port), tmp);
+
+               if (wait_for_us((I915_READ(DDI_BUF_CTL(port)) &
+                                DDI_BUF_IS_IDLE),
+                                8))
+                       DRM_ERROR("DDI port:%c buffer not idle\n",
+                                 port_name(port));
+       }
+}
+
 static void __attribute__((unused)) gen11_dsi_disable(
                        struct intel_encoder *encoder,
                        const struct intel_crtc_state *old_crtc_state,
@@ -872,4 +892,7 @@ static void __attribute__((unused)) gen11_dsi_disable(
 
        /* step2h,i,j: deconfig trancoder */
        gen11_dsi_deconfigure_trancoder(encoder);
+
+       /* step3: disable port */
+       gen11_dsi_disable_port(encoder);
 }