4.20-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 99b922f9ed6a6313c0d2247cde8aa1e4a0bd67e4 ]
[why] Some dongle doesn't have a valid extended dongle caps, but we still set the extended dongle caps to be valid. This causes validation fails for all timing.
[how] If no dp_hdmi_max_pixel_clk is provided, don't use extended dongle caps.
Signed-off-by: Wenjing Liu Wenjing.Liu@amd.com Reviewed-by: Aric Cyr Aric.Cyr@amd.com Reviewed-by: Jun Lei Jun.Lei@amd.com Acked-by: Abdoulaye Berthe Abdoulaye.Berthe@amd.com Acked-by: Leo Li sunpeng.li@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c index d91df5ef0cb3..d33a5ebe990b 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c @@ -2240,7 +2240,8 @@ static void get_active_converter_info( translate_dpcd_max_bpc( hdmi_color_caps.bits.MAX_BITS_PER_COLOR_COMPONENT);
- link->dpcd_caps.dongle_caps.extendedCapValid = true; + if (link->dpcd_caps.dongle_caps.dp_hdmi_max_pixel_clk != 0) + link->dpcd_caps.dongle_caps.extendedCapValid = true; }
break;