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drm/amd/display: Clear dpcd_sink_ext_caps if not set

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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: Anthony Koo <anthony.koo@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Paul Hsieh <paul.hsieh@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paul Hsieh 2023-10-25 10:53:35 +08:00 committed by Greg Kroah-Hartman
parent 9a5ae53e0f
commit a4a131bdd9
2 changed files with 4 additions and 0 deletions
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1
drivers/gpu/drm/amd/display/dc/dc_types.h
View File

@ -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 {

3
drivers/gpu/drm/amd/display/dc/link/link_detection.c
View File

@ -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);