drm/i915/icl: Disable portsync mode

This patch disables portsync mode if DSI link
is operating in dual link mode by writing to
TRANS_DDI_FUNC_CTL2 registers.

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/3e608420b58930b6da478801bff018c6e964eb94.1540900289.git.jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c
index 0041f57..71092f1 100644 (file)
--- a/drivers/gpu/drm/i915/icl_dsi.c
+++ b/drivers/gpu/drm/i915/icl_dsi.c
@@ -841,6 +841,16 @@ static void gen11_dsi_deconfigure_trancoder(struct intel_encoder *encoder)
                tmp &= ~TRANS_DDI_FUNC_ENABLE;
                I915_WRITE(TRANS_DDI_FUNC_CTL(dsi_trans), tmp);
        }
+
+       /* disable port sync mode if dual link */
+       if (intel_dsi->dual_link) {
+               for_each_dsi_port(port, intel_dsi->ports) {
+                       dsi_trans = dsi_port_to_transcoder(port);
+                       tmp = I915_READ(TRANS_DDI_FUNC_CTL2(dsi_trans));
+                       tmp &= ~PORT_SYNC_MODE_ENABLE;
+                       I915_WRITE(TRANS_DDI_FUNC_CTL2(dsi_trans), tmp);
+               }
+       }
 }
 
 static void __attribute__((unused)) gen11_dsi_disable(