From 106b4a2a78b2a2f14885604891957b84bba502db Mon Sep 17 00:00:00 2001 From: Adrian Betschart Date: Fri, 11 Sep 2026 17:13:14 +0200 Subject: drm/amd/display: Try RGB before YCbCr 4:4:4 in stream validation amdgpu_dm_create_validate_stream_for_sink() walks encoding_order[] and uses the first encoding that validates. YCbCr 4:4:4 is listed before RGB, so an HDMI sink that advertises 4:4:4 gets YCbCr 4:4:4 whenever the "color format" property is left at AUTO, even though RGB fits the same link. That contradicts the documented AUTO behaviour for HDMI in enum drm_connector_color_format (RGB, falling back to YCbCr 4:2:0 only when the bandwidth is not available or the mode is 4:2:0-only), which the amdgpu implementation of the property also describes. It also leaves the "Broadcast RGB" property without effect on such sinks, since the quantization range it selects only applies to RGB output. Try RGB first. The mask still holds every encoding the sink supports, so a mode that cannot carry RGB falls back exactly as before. For reference, v7.2 picked RGB here unless YCbCr 4:4:4 was forced through debugfs, while earlier kernels picked YCbCr 4:4:4 for any HDMI sink that advertised it. Fixes: 0b0ff65d3ca1 ("drm/amd/display: Refactor stream validation") Suggested-by: Adolfo Rodrigues Assisted-by: Claude Code:claude-fable-5-1 Signed-off-by: Adrian Betschart Reviewed-by: Fangzhi Zuo Tested-by: Adolfo Rodrigues Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher (cherry picked from commit 7de432bc753133764dc40d37f9388da56de251e7) --- drivers/tty/serdev/Kconfig | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 drivers/tty/serdev/Kconfig (limited to 'drivers/tty/serdev/Kconfig') diff --git a/drivers/tty/serdev/Kconfig b/drivers/tty/serdev/Kconfig new file mode 100644 index 000000000..e6dfe949a --- /dev/null +++ b/drivers/tty/serdev/Kconfig @@ -0,0 +1,32 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Serial bus device driver configuration +# +menuconfig SERIAL_DEV_BUS + tristate "Serial device bus" + help + Core support for devices connected via a serial port. + + Note that you typically also want to enable TTY port controller support. + +config RUST_SERIAL_DEV_BUS_ABSTRACTIONS + bool "Rust Serial device bus abstractions" + depends on RUST + select SERIAL_DEV_BUS + help + This enables the Rust abstraction for the serial device bus API. + +if SERIAL_DEV_BUS + +config SERIAL_DEV_CTRL_TTYPORT + bool "Serial device TTY port controller" + help + Say Y here if you want to use the Serial device bus with common TTY + drivers (e.g. serial drivers). + + If unsure, say Y. + depends on TTY + depends on SERIAL_DEV_BUS != m + default y + +endif -- cgit v1.3.1