Commit 68d9821f authored by Fangzhi Zuo's avatar Fangzhi Zuo Committed by Alex Deucher
Browse files

drm/amd/display: Retrieve DSC Branch Decoder Caps 



DSC extended branch decoder caps 0xA0 ~ 0xA2 is read from dsc_aux.
The dsc_aux is returned from drm dsc determination policy with the
right DSC capable MST branch device for decoding.

The values are all zero if DSC decoding at a MST BU with virtual DPCD;
The values are meaningful when DSC decoding at a MST BU without
virtual DPCD or at a DSC capable MST endpoint.

Signed-off-by: default avatarFangzhi Zuo <Jerry.Zuo@amd.com>
Reviewed-by: default avatarNicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: default avatarQingqing Zhuo <qingqing.zhuo@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 4932d176

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c

+8 −2
Original line number Diff line number Diff line
@@ -160,6 +160,8 @@ static bool validate_dsc_caps_on_connector(struct amdgpu_dm_connector *aconnecto 
	struct dc_sink *dc_sink = aconnector->dc_sink;

	struct drm_dp_mst_port *port = aconnector->port;

	u8 dsc_caps[16] = { 0 };

	u8 dsc_branch_dec_caps_raw[3] = { 0 };	// DSC branch decoder caps 0xA0 ~ 0xA2

	u8 *dsc_branch_dec_caps = NULL;



	aconnector->dsc_aux = drm_dp_mst_dsc_aux_for_port(port);

#if defined(CONFIG_HP_HOOK_WORKAROUND)
@@ -182,8 +184,12 @@ static bool validate_dsc_caps_on_connector(struct amdgpu_dm_connector *aconnecto 
	if (drm_dp_dpcd_read(aconnector->dsc_aux, DP_DSC_SUPPORT, dsc_caps, 16) < 0)

		return false;



	if (drm_dp_dpcd_read(aconnector->dsc_aux,

			DP_DSC_BRANCH_OVERALL_THROUGHPUT_0, dsc_branch_dec_caps_raw, 3) == 3)

		dsc_branch_dec_caps = dsc_branch_dec_caps_raw;



	if (!dc_dsc_parse_dsc_dpcd(aconnector->dc_link->ctx->dc,

				   dsc_caps, NULL,

				  dsc_caps, dsc_branch_dec_caps,

				  &dc_sink->dsc_caps.dsc_dec_caps))

		return false;