target/linux/bcm27xx/patches-5.4/950-0842-drm-vc4-Allow-interlaced-HDMI-modes-from-FKMS.patch

   1 From 354bf89fd678a6da6256a6ac37440c27c3b62e80 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Tue, 30 Jun 2020 18:04:13 +0100
   4 Subject: [PATCH] drm/vc4: Allow interlaced HDMI modes from FKMS.
   5
   6 Having checked the firmware handling for interlaced modes,
   7 it appears to be possible to support interlaced modes on
   8 HDMI without adverse side effects, so do so.
   9
  10 https://github.com/raspberrypi/linux/issues/3694
  11
  12 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  13 ---
  14  drivers/gpu/drm/vc4/vc4_firmware_kms.c | 5 ++++-
  15  1 file changed, 4 insertions(+), 1 deletion(-)
  16
  17 --- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  18 +++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  19 @@ -936,6 +936,9 @@ static void vc4_crtc_mode_set_nofb(struc
  20                 break;
  21         }
  22
  23 +       if (mode->flags & DRM_MODE_FLAG_INTERLACE)
  24 +               mb.timings.flags |= TIMINGS_FLAGS_INTERLACE;
  25 +
  26         mb.timings.video_id_code = frame.avi.video_code;
  27
  28         if (!vc4_encoder->hdmi_monitor) {
  29 @@ -1632,7 +1635,7 @@ vc4_fkms_connector_init(struct drm_devic
  30                                    DRM_MODE_CONNECTOR_HDMIA);
  31                 drm_connector_helper_add(connector,
  32                                          &vc4_fkms_connector_helper_funcs);
  33 -               connector->interlace_allowed = 0;
  34 +               connector->interlace_allowed = 1;
  35         }
  36
  37         ret = drm_mode_create_tv_margin_properties(dev);