From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> CH7511 eDP->LVDS bridge doesn't seem to set SINK_COUNT properly causing i915 to detect it as disconnected. Add a quirk to ignore SINK_COUNT on these devices. Cc: David S. <david@xxxxxxxxxxxx> Cc: Peteris Rudzusiks <peteris.rudzusiks@xxxxxxxxx> Tested-by: Peteris Rudzusiks <peteris.rudzusiks@xxxxxxxxx> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105406 Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> --- drivers/gpu/drm/drm_dp_helper.c | 4 +++- include/drm/drm_dp_helper.h | 7 +++++++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index e6af758a7d22..0b994d083a89 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -1280,7 +1280,9 @@ static const struct dpcd_quirk dpcd_quirk_list[] = { /* LG LP140WF6-SPM1 eDP panel */ { OUI(0x00, 0x22, 0xb9), DEVICE_ID('s', 'i', 'v', 'a', 'r', 'T'), false, BIT(DP_DPCD_QUIRK_CONSTANT_N) }, /* Apple panels need some additional handling to support PSR */ - { OUI(0x00, 0x10, 0xfa), DEVICE_ID_ANY, false, BIT(DP_DPCD_QUIRK_NO_PSR) } + { OUI(0x00, 0x10, 0xfa), DEVICE_ID_ANY, false, BIT(DP_DPCD_QUIRK_NO_PSR) }, + /* CH7511 seems to leave SINK_COUNT zeroed */ + { OUI(0x00, 0x00, 0x00), DEVICE_ID('C', 'H', '7', '5', '1', '1'), false, BIT(DP_DPCD_QUIRK_NO_SINK_COUNT) }, }; #undef OUI diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 3fc534ee8174..7e52eb81284a 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -1414,6 +1414,13 @@ enum drm_dp_quirk { * driver still need to implement proper handling for such device. */ DP_DPCD_QUIRK_NO_PSR, + /** + * @DP_DPCD_QUIRK_NO_SINK_COUNT: + * + * The device does not set SINK_COUNT to a non-zero value. + * The driver should ignore SINK_COUNT during detection. + */ + DP_DPCD_QUIRK_NO_SINK_COUNT, }; /** -- 2.21.0 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
