diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_dp_mst.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp_mst.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c index 5f2217483a87..37ff5457d5d1 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c @@ -421,15 +421,22 @@ static int mode_hblank_period_ns(const struct drm_display_mode *mode) static bool hblank_expansion_quirk_needs_dsc(const struct intel_connector *connector, - const struct intel_crtc_state *crtc_state) + const struct intel_crtc_state *crtc_state, + const struct link_config_limits *limits) { const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode; + bool is_uhbr_sink = connector->mst_port && + drm_dp_128b132b_supported(connector->mst_port->dpcd); + int hblank_limit = is_uhbr_sink ? 500 : 300; if (!connector->dp.dsc_hblank_expansion_quirk) return false; - if (mode_hblank_period_ns(adjusted_mode) > 300) + if (is_uhbr_sink && !drm_dp_is_uhbr_rate(limits->max_rate)) + return false; + + if (mode_hblank_period_ns(adjusted_mode) > hblank_limit) return false; return true; @@ -445,7 +452,7 @@ adjust_limits_for_dsc_hblank_expansion_quirk(const struct intel_connector *conne const struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc); int min_bpp_x16 = limits->link.min_bpp_x16; - if (!hblank_expansion_quirk_needs_dsc(connector, crtc_state)) + if (!hblank_expansion_quirk_needs_dsc(connector, crtc_state, limits)) return true; if (!dsc) { @@ -1604,7 +1611,14 @@ static bool detect_dsc_hblank_expansion_quirk(const struct intel_connector *conn DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC)) return false; - if (!(dpcd[DP_RECEIVE_PORT_0_CAP_0] & DP_HBLANK_EXPANSION_CAPABLE)) + /* + * UHBR (MST sink) devices requiring this quirk don't advertise the + * HBLANK expansion support. Presuming that they perform HBLANK + * expansion internally, or are affected by this issue on modes with a + * short HBLANK for other reasons. + */ + if (!drm_dp_128b132b_supported(dpcd) && + !(dpcd[DP_RECEIVE_PORT_0_CAP_0] & DP_HBLANK_EXPANSION_CAPABLE)) return false; drm_dbg_kms(&i915->drm, |