target/linux/bcm27xx/patches-5.15/950-0643-drm-vc4-hdmi-Fix-no-video-output-on-DVI-monitors.patch

   1 From 64c3b233b38af0817c70d142c65b915ca1fbc71a Mon Sep 17 00:00:00 2001
   2 From: Matthias Reichl <hias@horus.com>
   3 Date: Thu, 30 Dec 2021 15:12:19 +0100
   4 Subject: [PATCH] drm/vc4: hdmi: Fix no video output on DVI monitors
   5
   6 The drm edid parser doesn't signal RGB support on DVI monitors
   7 with old edid versions, leading to 8-bit RGB mode being rejected
   8 and no video on DVI monitors.
   9
  10 As 8-bit RGB is mandatory on HDMI and DVI monitors anyways we can
  11 simply drop the RGB format check, aligning vc4 with other drivers.
  12
  13 Signed-off-by: Matthias Reichl <hias@horus.com>
  14 ---
  15  drivers/gpu/drm/vc4/vc4_hdmi.c | 3 ---
  16  1 file changed, 3 deletions(-)
  17
  18 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
  19 +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
  20 @@ -1415,9 +1415,6 @@ vc4_hdmi_sink_supports_format_bpc(const
  21         case VC4_HDMI_OUTPUT_RGB:
  22                 drm_dbg(dev, "RGB Format, checking the constraints.\n");
  23
  24 -               if (!(info->color_formats & DRM_COLOR_FORMAT_RGB444))
  25 -                       return false;
  26 -
  27                 if (bpc == 10 && !(info->edid_hdmi_rgb444_dc_modes & DRM_EDID_HDMI_DC_30)) {
  28                         drm_dbg(dev, "10 BPC but sink doesn't support Deep Color 30.\n");
  29                         return false;