[PATCH v5 04/17] drm/bridge: Act on the DRM color format property
From: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Date: 2025-11-28 21:07:11
Also in:
amd-gfx, dri-devel, intel-gfx, intel-xe, linux-rockchip, lkml
Subsystem:
drm drivers, drm drivers and misc gpu patches, drm drivers for bridge chips, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Andrzej Hajda, Neil Armstrong, Robert Foss, Linus Torvalds
The new DRM color format property allows userspace to request a specific color format on a connector. In turn, this fills the connector state's color_format member to switch color formats. Make drm_bridges consider the color_format set in the connector state during the atomic bridge check. Specifically, reject any output bus formats that do not correspond to the requested color format. Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com> --- drivers/gpu/drm/drm_bridge.c | 45 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+)
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 8f355df883d8..8aac9747f35e 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c@@ -1052,6 +1052,47 @@ static int select_bus_fmt_recursive(struct drm_bridge *first_bridge, return ret; } +static bool __pure bus_format_is_color_fmt(u32 bus_fmt, enum drm_color_format fmt) +{ + if (fmt == DRM_COLOR_FORMAT_AUTO) + return true; + + switch (bus_fmt) { + case MEDIA_BUS_FMT_FIXED: + return true; + case MEDIA_BUS_FMT_RGB888_1X24: + case MEDIA_BUS_FMT_RGB101010_1X30: + case MEDIA_BUS_FMT_RGB121212_1X36: + case MEDIA_BUS_FMT_RGB161616_1X48: + return fmt == DRM_COLOR_FORMAT_RGB444; + case MEDIA_BUS_FMT_YUV8_1X24: + case MEDIA_BUS_FMT_YUV10_1X30: + case MEDIA_BUS_FMT_YUV12_1X36: + case MEDIA_BUS_FMT_YUV16_1X48: + return fmt == DRM_COLOR_FORMAT_YCBCR444; + case MEDIA_BUS_FMT_UYVY8_1X16: + case MEDIA_BUS_FMT_VYUY8_1X16: + case MEDIA_BUS_FMT_YUYV8_1X16: + case MEDIA_BUS_FMT_YVYU8_1X16: + case MEDIA_BUS_FMT_UYVY10_1X20: + case MEDIA_BUS_FMT_YUYV10_1X20: + case MEDIA_BUS_FMT_VYUY10_1X20: + case MEDIA_BUS_FMT_YVYU10_1X20: + case MEDIA_BUS_FMT_UYVY12_1X24: + case MEDIA_BUS_FMT_VYUY12_1X24: + case MEDIA_BUS_FMT_YUYV12_1X24: + case MEDIA_BUS_FMT_YVYU12_1X24: + return fmt == DRM_COLOR_FORMAT_YCBCR422; + case MEDIA_BUS_FMT_UYYVYY8_0_5X24: + case MEDIA_BUS_FMT_UYYVYY10_0_5X30: + case MEDIA_BUS_FMT_UYYVYY12_0_5X36: + case MEDIA_BUS_FMT_UYYVYY16_0_5X48: + return fmt == DRM_COLOR_FORMAT_YCBCR420; + default: + return false; + } +} + /* * This function is called by &drm_atomic_bridge_chain_check() just before * calling &drm_bridge_funcs.atomic_check() on all elements of the chain.
@@ -1137,6 +1178,10 @@ drm_atomic_bridge_chain_select_bus_fmts(struct drm_bridge *bridge, } for (i = 0; i < num_out_bus_fmts; i++) { + if (!bus_format_is_color_fmt(out_bus_fmts[i], conn_state->color_format)) { + ret = -ENOTSUPP; + continue; + } ret = select_bus_fmt_recursive(bridge, last_bridge, crtc_state, conn_state, out_bus_fmts[i]); if (ret != -ENOTSUPP)
--
2.52.0