Commit 64b3f7a3 authored Aug 12, 2024 by Fangzhi Zuo Committed by Wen Zhiwei Oct 29, 2024

drm/amd/display: Fix Synaptics Cascaded Panamera DSC Determination

stable inclusion
from stable-v6.6.54
commit b5d38f1d4acb3a0aa0763d4d70bec6c9cf51300c
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/IAZ3K2

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=b5d38f1d4acb3a0aa0763d4d70bec6c9cf51300c



--------------------------------

commit 4437936c6b696b98f3fe1d8679a2788c41b4df77 upstream.

Synaptics Cascaded Panamera topology needs to unconditionally
acquire root aux for dsc decoding.

Reviewed-by: Roman Li <roman.li@amd.com>
Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Mario Limonciello <superm1@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Wen Zhiwei <wenzhiwei@kylinos.cn>

parent f094ce0e

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

+1 −1

Original line number	Diff line number	Diff line
		@@ -246,7 +246,7 @@ static bool validate_dsc_caps_on_connector(struct amdgpu_dm_connector *aconnecto
		aconnector->dsc_aux = &aconnector->mst_root->dm_dp_aux.aux;

		/* synaptics cascaded MST hub case */
		if (!aconnector->dsc_aux && is_synaptics_cascaded_panamera(aconnector->dc_link, port))
		if (is_synaptics_cascaded_panamera(aconnector->dc_link, port))
		aconnector->dsc_aux = port->mgr->aux;

		if (!aconnector->dsc_aux)