diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.10/950-0480-drm-vc4-Change-the-default-DPI-format-to-being-18bpp.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.10/950-0480-drm-vc4-Change-the-default-DPI-format-to-being-18bpp.patch | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.10/950-0480-drm-vc4-Change-the-default-DPI-format-to-being-18bpp.patch b/target/linux/bcm27xx/patches-5.10/950-0480-drm-vc4-Change-the-default-DPI-format-to-being-18bpp.patch new file mode 100644 index 0000000000..b7aa16ee40 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.10/950-0480-drm-vc4-Change-the-default-DPI-format-to-being-18bpp.patch @@ -0,0 +1,34 @@ +From 9a5326f4c3a3a066802886f1e09216a1894c943d Mon Sep 17 00:00:00 2001 +From: Dave Stevenson <dave.stevenson@raspberrypi.com> +Date: Fri, 12 Feb 2021 17:31:37 +0000 +Subject: [PATCH] drm/vc4: Change the default DPI format to being + 18bpp, not 24. + +DPI hasn't really been used up until now, so the default has +been meaningless. +In theory we should be able to pass the desired format for the +adjacent bridge chip through, but framework seems to be missing +for that. + +As the main device to use DPI is the VGA666 or Adafruit Kippah, +both of which use RGB666, change the default to being RGB666 instead +of RGB888. + +Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com> +--- + drivers/gpu/drm/vc4/vc4_dpi.c | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +--- a/drivers/gpu/drm/vc4/vc4_dpi.c ++++ b/drivers/gpu/drm/vc4/vc4_dpi.c +@@ -178,8 +178,8 @@ static void vc4_dpi_encoder_enable(struc + break; + } + } else { +- /* Default to 24bit if no connector found. */ +- dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB, DPI_FORMAT); ++ /* Default to 18bit if no connector found. */ ++ dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_1, DPI_FORMAT); + } + + if (mode->flags & DRM_MODE_FLAG_NHSYNC) |