From: Anthony Koo anthony.koo@amd.com
[ Upstream commit 88eac241a1fc500ce5274a09ddc4bd5fc2b5adb6 ]
[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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c | 4 ++++ drivers/gpu/drm/amd/display/dc/dc_types.h | 1 + 2 files changed, 5 insertions(+)
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 b0dea759cd860..8aecf044e2ae8 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c @@ -154,6 +154,10 @@ 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 6c2a3d9a4c2e7..283082666be51 100644 --- 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 {