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| author | Yijie Yang <yijie.yang@oss.qualcomm.com> | 2026-08-11 16:46:47 +0800 |
|---|---|---|
| committer | Rob Herring (Arm) <robh@kernel.org> | 2026-08-15 15:46:52 -0500 |
| commit | e1c13aed4a1641550e8c9518c96f016e1d52d09b (patch) | |
| tree | 61c2297688373db165cc857b7c7adcb147a5c419 /Documentation/admin-guide/edid.rst | |
| download | linux-stable-e1c13aed4a1641550e8c9518c96f016e1d52d09b.tar.gz linux-stable-e1c13aed4a1641550e8c9518c96f016e1d52d09b.zip | |
dt-bindings: interconnect: qcom-bwmon: Add Maili cpu-bwmon compatiblegrafted
Add the Qualcomm Maili SoC compatible string for the CPU bandwidth
monitor (BWMONv4). This falls back to the sdm845-bwmon compatible,
consistent with the existing pattern used by other recent SoCs such as
sm8750 and kaanapali.
Signed-off-by: Yijie Yang <yijie.yang@oss.qualcomm.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Jingyi Wang <jingyi.wang@oss.qualcomm.com>
Link: https://patch.msgid.link/20260811-bwmon-v2-1-80f7f150ab9e@oss.qualcomm.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Diffstat (limited to 'Documentation/admin-guide/edid.rst')
| -rw-r--r-- | Documentation/admin-guide/edid.rst | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/Documentation/admin-guide/edid.rst b/Documentation/admin-guide/edid.rst new file mode 100644 index 000000000..1a9b965aa --- /dev/null +++ b/Documentation/admin-guide/edid.rst @@ -0,0 +1,27 @@ +.. SPDX-License-Identifier: GPL-2.0 + +==== +EDID +==== + +In the good old days when graphics parameters were configured explicitly +in a file called xorg.conf, even broken hardware could be managed. + +Today, with the advent of Kernel Mode Setting, a graphics board is +either correctly working because all components follow the standards - +or the computer is unusable, because the screen remains dark after +booting or it displays the wrong area. Cases when this happens are: + +- The graphics board does not recognize the monitor. +- The graphics board is unable to detect any EDID data. +- The graphics board incorrectly forwards EDID data to the driver. +- The monitor sends no or bogus EDID data. +- A KVM sends its own EDID data instead of querying the connected monitor. + +Adding the kernel parameter "nomodeset" helps in most cases, but causes +restrictions later on. + +As a remedy for such situations, the kernel configuration item +CONFIG_DRM_LOAD_EDID_FIRMWARE was introduced. It allows to provide an +individually prepared or corrected EDID data set in the /lib/firmware +directory from where it is loaded via the firmware interface. |
