On Tue, May 28, 2019 at 05:06:49PM +0300, Ville Syrjala wrote: > 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> Pushed patch 1 to drm-misc-next with Jani's irc ack. I thought of pushing the i915 patch drm-misc-next too, but then thought better of it due to the current i915 code churn. I'll just wait for a backmerge instead. > --- > 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 -- Ville Syrjälä Intel _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
