From: "Jerry (Fangzhi) Zuo" <Jerry.Zuo@xxxxxxx>
[Why]
Some monitors mark 4K at 60 capable HDMI port only have 300MHz TMDS
maximum, but the edid includes 4K at 60 mode in cea extension block.
[How]
To enable 4K at 60, need to limit BW by allowing YCbCr420 ONLY mode.
Add YCbCr420 only support for monitors that do not fully support
HDMI2.0, e.g., ASUS PA328. The YCbCr420 only support applies to
DCN, DCE112 or higher.
Signed-off-by: Jerry (Fangzhi) Zuo <Jerry.Zuo at amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu at amd.com>
Acked-by: Harry Wentland <harry.wentland at amd.com>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index cc69cf484325..e79e89be486a 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3569,7 +3569,6 @@ void amdgpu_dm_connector_init_helper(struct amdgpu_display_manager *dm,
aconnector->base.stereo_allowed = false;
aconnector->base.dpms = DRM_MODE_DPMS_OFF;
aconnector->hpd.hpd = AMDGPU_HPD_NONE; /* not used */
-
mutex_init(&aconnector->hpd_lock);
/* configure support HPD hot plug connector_>polled default value is 0
@@ -3578,9 +3577,13 @@ void amdgpu_dm_connector_init_helper(struct amdgpu_display_manager *dm,
switch (connector_type) {
case DRM_MODE_CONNECTOR_HDMIA:
aconnector->base.polled = DRM_CONNECTOR_POLL_HPD;
+ aconnector->base.ycbcr_420_allowed =
+ link->link_enc->features.ycbcr420_supported ? true : false;
break;
case DRM_MODE_CONNECTOR_DisplayPort:
aconnector->base.polled = DRM_CONNECTOR_POLL_HPD;
+ aconnector->base.ycbcr_420_allowed =
+ link->link_enc->features.ycbcr420_supported ? true : false;
break;
case DRM_MODE_CONNECTOR_DVID:
aconnector->base.polled = DRM_CONNECTOR_POLL_HPD;
--
2.17.1
