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/usb/class/Kconfig | 49 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 drivers/usb/class/Kconfig (limited to 'drivers/usb/class/Kconfig') diff --git a/drivers/usb/class/Kconfig b/drivers/usb/class/Kconfig new file mode 100644 index 000000000..d3f5162bd --- /dev/null +++ b/drivers/usb/class/Kconfig @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# USB Class driver configuration +# +comment "USB Device Class drivers" + +config USB_ACM + tristate "USB Modem (CDC ACM) support" + depends on TTY + help + This driver supports USB modems and ISDN adapters which support the + Communication Device Class Abstract Control Model interface. + Please read for details. + + If your modem only reports "Cls=ff(vend.)" in the descriptors in + /sys/kernel/debug/usb/devices, then your modem will not work with this + driver. + + To compile this driver as a module, choose M here: the + module will be called cdc-acm. + +config USB_PRINTER + tristate "USB Printer support" + help + Say Y here if you want to connect a USB printer to your computer's + USB port. + + To compile this driver as a module, choose M here: the + module will be called usblp. + +config USB_WDM + tristate "USB Wireless Device Management support" + help + This driver supports the WMC Device Management functionality + of cell phones compliant to the CDC WMC specification. You can use + AT commands over this device. + + To compile this driver as a module, choose M here: the + module will be called cdc-wdm. + +config USB_TMC + tristate "USB Test and Measurement Class support" + help + Say Y here if you want to connect a USB device that follows + the USB.org specification for USB Test and Measurement devices + to your computer's USB port. + + To compile this driver as a module, choose M here: the + module will be called usbtmc. -- cgit v1.3.1