From: Imre Deak Date: Tue, 24 Oct 2023 10:22:16 +0000 (+0300) Subject: drm/dp_mst: Add HBLANK expansion quirk for Synaptics MST hubs X-Git-Tag: v6.8-rc1~111^2~21^2~105 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a6315ec25eed0e9a70cb1cfc43cf694911546a5c;p=thirdparty%2Fkernel%2Flinux.git drm/dp_mst: Add HBLANK expansion quirk for Synaptics MST hubs 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 Cc: dri-devel@lists.freedesktop.org Reviewed-by: Stanislav Lisovskiy Acked-by: Maxime Ripard Reviewed-by: Lyude Paul Signed-off-by: Imre Deak Link: https://patchwork.freedesktop.org/patch/msgid/20231030155843.2251023-9-imre.deak@intel.com --- diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index 8a1b64c57dfdb..2a95a05f0437e 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -2242,6 +2242,8 @@ 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 3369104e2d257..01636a679ee6c 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, }; /**