From e7baae1cfb7fd1a31fa8c968403cbc761cf999ff Mon Sep 17 00:00:00 2001 From: "Jerry (Fangzhi) Zuo" Date: Fri, 22 Jun 2018 17:12:47 -0400 Subject: [PATCH] drm/amd/display: Add YCbCr420 only support for HDMI 4K@60 [Why] Some monitors mark 4K@60 capable HDMI port only have 300MHz TMDS maximum, but the edid includes 4K@60 mode in cea extension block. [How] To enable 4K@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 Reviewed-by: Charlene Liu Acked-by: Harry Wentland Signed-off-by: Alex Deucher --- 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 d2cc32add5f7..88854982171c 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -3509,7 +3509,6 @@ 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 @@ -3518,9 +3517,13 @@ 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; -- 2.11.0