@@ -930,16 +930,17 @@ enum drm_mode_status msm_dp_bridge_mode_valid(struct drm_bridge *bridge,
return -EINVAL;
}
- if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
- return MODE_CLOCK_HIGH;
-
msm_dp_display = container_of(dp, struct msm_dp_display_private, msm_dp_display);
link_info = &msm_dp_display->panel->link_info;
- if (drm_mode_is_420_only(&dp->connector->display_info, mode) &&
- msm_dp_display->panel->vsc_sdp_supported)
+ if ((drm_mode_is_420_only(&dp->connector->display_info, mode) &&
+ msm_dp_display->panel->vsc_sdp_supported) ||
+ msm_dp_wide_bus_available(dp))
mode_pclk_khz /= 2;
+ if (mode_pclk_khz > DP_MAX_PIXEL_CLK_KHZ)
+ return MODE_CLOCK_HIGH;
+
mode_bpp = dp->connector->display_info.bpc * num_components;
if (!mode_bpp)
mode_bpp = default_bpp;
@@ -257,7 +257,10 @@ static enum drm_mode_status msm_edp_bridge_mode_valid(struct drm_bridge *bridge,
return -EINVAL;
}
- if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
+ if (msm_dp_wide_bus_available(dp))
+ mode_pclk_khz /= 2;
+
+ if (mode_pclk_khz > DP_MAX_PIXEL_CLK_KHZ)
return MODE_CLOCK_HIGH;
/*
Widebus allows the DP controller to operate in 2 pixel per clock mode. The mode validation logic validates the mode->clock against the max DP pixel clock. However the max DP pixel clock limit assumes widebus is already enabled. Adjust the mode validation logic to only compare the adjusted pixel clock which accounts for widebus against the max DP pixel clock. Also fix the mode validation logic for YUV420 modes as in that case as well, only half the pixel clock is needed. Fixes: 757a2f36ab09 ("drm/msm/dp: enable widebus feature for display port") Fixes: 6db6e5606576 ("drm/msm/dp: change clock related programming for YUV420 over DP") Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com> --- Changes in v2: - move msm_dp_wide_bus_available() to the next line - Link to v1: https://lore.kernel.org/r/20250128-dp-widebus-fix-v1-1-b66d2265596b@quicinc.com --- drivers/gpu/drm/msm/dp/dp_display.c | 11 ++++++----- drivers/gpu/drm/msm/dp/dp_drm.c | 5 ++++- 2 files changed, 10 insertions(+), 6 deletions(-) --- base-commit: 2bd7708f11777d4fd436fcba62b57cff6a92e389 change-id: 20250127-dp-widebus-fix-fba78bbe242d Best regards,