drm/amd/display: add monitor patch to add T7 delay

[Why]
Specifically to one panel,
TCON is able to accept active video signal quickly, but
the Source Driver requires 2-3 frames of extra time.

It is a Panel issue since TCON needs to take care of
all Sink requirements including Source Driver. But in
this case it does not.

Customer is asking to add fixed T7 delay as panel
workaround.

[How]
Add monitor specific patch to add T7 delay

Signed-off-by: Anthony Koo <anthony.koo@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
index 46257f0fcbe7d271f32d2c39068cc483f9b0fdfb..878f47b59d5a10865cd167002498dc54265e1658 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c
@@ -162,6 +162,10 @@ bool edp_receiver_ready_T7(struct dc_link *link)
                        break;
                udelay(25); //MAx T7 is 50ms
        } while (++tries < 300);
+
+       if (link->local_sink->edid_caps.panel_patch.extra_t7_ms > 0)
+               udelay(link->local_sink->edid_caps.panel_patch.extra_t7_ms * 1000);
+
        return result;
 }
 

diff --git a/drivers/gpu/drm/amd/display/dc/dc_types.h b/drivers/gpu/drm/amd/display/dc/dc_types.h
index 6eabb6491a3df07ce0d42025806aa5b1dfafa727..ce6d73d21ccae0106854fa2f25b4a91e636cbe07 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dc_types.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_types.h
@@ -202,6 +202,7 @@ struct dc_panel_patch {
        unsigned int dppowerup_delay;
        unsigned int extra_t12_ms;
        unsigned int extra_delay_backlight_off;
+       unsigned int extra_t7_ms;
 };
 
 struct dc_edid_caps {