| Message ID | 20231030155843.2251023-9-imre.deak@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/i915: Improve BW management on MST links | expand |
Reviewed-by: Lyude Paul <lyude@redhat.com> On Mon, 2023-10-30 at 17:58 +0200, Imre Deak wrote: > Add a quirk for Synaptics MST hubs, which require a workaround - at leat > on i915 - for some modes, on which the hub applies HBLANK expansion. > These modes will only work by enabling DSC decompression for them, a > follow-up patch will do this in i915. > > v2: > - Fix the quirk name in its DocBook description. > > Cc: Lyude Paul <lyude@redhat.com> > Cc: dri-devel@lists.freedesktop.org > Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> > Signed-off-by: Imre Deak <imre.deak@intel.com> > --- > drivers/gpu/drm/display/drm_dp_helper.c | 2 ++ > include/drm/display/drm_dp_helper.h | 7 +++++++ > 2 files changed, 9 insertions(+) > > diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c > index f3680f4e69708..e5d7970a9ddd0 100644 > --- a/drivers/gpu/drm/display/drm_dp_helper.c > +++ b/drivers/gpu/drm/display/drm_dp_helper.c > @@ -2245,6 +2245,8 @@ static const struct dpcd_quirk dpcd_quirk_list[] = { > { OUI(0x00, 0x00, 0x00), DEVICE_ID('C', 'H', '7', '5', '1', '1'), false, BIT(DP_DPCD_QUIRK_NO_SINK_COUNT) }, > /* Synaptics DP1.4 MST hubs can support DSC without virtual DPCD */ > { OUI(0x90, 0xCC, 0x24), DEVICE_ID_ANY, true, BIT(DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD) }, > + /* Synaptics DP1.4 MST hubs require DSC for some modes on which it applies HBLANK expansion. */ > + { OUI(0x90, 0xCC, 0x24), DEVICE_ID_ANY, true, BIT(DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC) }, > /* Apple MacBookPro 2017 15 inch eDP Retina panel reports too low DP_MAX_LINK_RATE */ > { OUI(0x00, 0x10, 0xfa), DEVICE_ID(101, 68, 21, 101, 98, 97), false, BIT(DP_DPCD_QUIRK_CAN_DO_MAX_LINK_RATE_3_24_GBPS) }, > }; > diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h > index 3d74b2cec72fd..da94932f4262b 100644 > --- a/include/drm/display/drm_dp_helper.h > +++ b/include/drm/display/drm_dp_helper.h > @@ -632,6 +632,13 @@ enum drm_dp_quirk { > * the DP_MAX_LINK_RATE register reporting a lower max multiplier. > */ > DP_DPCD_QUIRK_CAN_DO_MAX_LINK_RATE_3_24_GBPS, > + /** > + * @DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC: > + * > + * The device applies HBLANK expansion for some modes, but this > + * requires enabling DSC. > + */ > + DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC, > }; > > /**
diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index f3680f4e69708..e5d7970a9ddd0 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -2245,6 +2245,8 @@ static const struct dpcd_quirk dpcd_quirk_list[] = { { OUI(0x00, 0x00, 0x00), DEVICE_ID('C', 'H', '7', '5', '1', '1'), false, BIT(DP_DPCD_QUIRK_NO_SINK_COUNT) }, /* Synaptics DP1.4 MST hubs can support DSC without virtual DPCD */ { OUI(0x90, 0xCC, 0x24), DEVICE_ID_ANY, true, BIT(DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD) }, + /* Synaptics DP1.4 MST hubs require DSC for some modes on which it applies HBLANK expansion. */ + { OUI(0x90, 0xCC, 0x24), DEVICE_ID_ANY, true, BIT(DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC) }, /* Apple MacBookPro 2017 15 inch eDP Retina panel reports too low DP_MAX_LINK_RATE */ { OUI(0x00, 0x10, 0xfa), DEVICE_ID(101, 68, 21, 101, 98, 97), false, BIT(DP_DPCD_QUIRK_CAN_DO_MAX_LINK_RATE_3_24_GBPS) }, }; diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h index 3d74b2cec72fd..da94932f4262b 100644 --- a/include/drm/display/drm_dp_helper.h +++ b/include/drm/display/drm_dp_helper.h @@ -632,6 +632,13 @@ enum drm_dp_quirk { * the DP_MAX_LINK_RATE register reporting a lower max multiplier. */ DP_DPCD_QUIRK_CAN_DO_MAX_LINK_RATE_3_24_GBPS, + /** + * @DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC: + * + * The device applies HBLANK expansion for some modes, but this + * requires enabling DSC. + */ + DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC, }; /**