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According to the eDP specification (VESA Embedded DisplayPort Standard v1.4b, Section 3.3.10.2), if the value of DP_EDP_PWMGEN_BIT_COUNT is less than DP_EDP_PWMGEN_BIT_COUNT_CAP_MIN, the sink is required to use the MIN value as the effective PWM bit count. This commit updates the logic to clamp the reported DP_EDP_PWMGEN_BIT_COUNT to the range defined by _CAP_MIN and _CAP_MAX. As part of this change, the behavior is modified such that reading both _CAP_MIN and _CAP_MAX registers is now required to succeed, otherwise bl->max value could end up being not set although drm_edp_backlight_probe_max() returned success. This ensures correct handling of eDP panels that report a zero PWM bit count but still provide valid non-zero MIN and MAX capability values. Without this clamping, brightness values may be interpreted incorrectly, leading to a dim or non-functional backlight. For example, the Samsung ATNA40YK20 OLED panel used in the Lenovo ThinkPad T14s Gen6 (Snapdragon) reports a PWM bit count of 0, but supports AUX backlight control and declares a valid 11-bit range. Clamping ensures brightness scaling works as intended on such panels. Co-developed-by: Rui Miguel Silva <rui.silva@linaro.org> Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org> Signed-off-by: Christopher Obbard <christopher.obbard@linaro.org> Tested-by: Christopher Obbard <christopher.obbard@linaro.org> Reviewed-by: Christopher Obbard <christopher.obbard@linaro.org> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> Link: https://lore.kernel.org/r/20250814-topic-x1e80100-t14s-oled-dp-brightness-v7-1-b3d7b4dfe8c5@linaro.org
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.