Commit 44f5fe6f authored by Paul Hsieh's avatar Paul Hsieh Committed by Zheng Zengkai
Browse files

drm/amd/display: Clear dpcd_sink_ext_caps if not set 

stable inclusion
from stable-v6.6.3
commit a4a131bdd9cf37c76388276835a1c31d3e1dc240
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8LBQP

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a4a131bdd9cf37c76388276835a1c31d3e1dc240



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

commit 923bbfe6c888812db1088d684bd30c24036226d2 upstream.

[WHY]
Some eDP panels' ext caps don't set initial values
and the value of dpcd_addr (0x317) is random.
It means that sometimes the eDP can be OLED, miniLED and etc,
and cause incorrect backlight control interface.

[HOW]
Add remove_sink_ext_caps to remove sink ext caps (HDR, OLED and etc)

Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: default avatarAnthony Koo <anthony.koo@amd.com>
Acked-by: default avatarAlex Hung <alex.hung@amd.com>
Signed-off-by: default avatarPaul Hsieh <paul.hsieh@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent 9d77c95d

drivers/gpu/drm/amd/display/dc/dc_types.h

+1 −0
Original line number Diff line number Diff line
@@ -189,6 +189,7 @@ struct dc_panel_patch { 
	unsigned int disable_fams;

	unsigned int skip_avmute;

	unsigned int mst_start_top_delay;

	unsigned int remove_sink_ext_caps;

};



struct dc_edid_caps {

drivers/gpu/drm/amd/display/dc/link/link_detection.c

+3 −0
Original line number Diff line number Diff line
@@ -1085,6 +1085,9 @@ static bool detect_link_and_local_sink(struct dc_link *link, 
		if (sink->edid_caps.panel_patch.skip_scdc_overwrite)

			link->ctx->dc->debug.hdmi20_disable = true;



		if (sink->edid_caps.panel_patch.remove_sink_ext_caps)

			link->dpcd_sink_ext_caps.raw = 0;



		if (dc_is_hdmi_signal(link->connector_signal))

			read_scdc_caps(link->ddc, link->local_sink);