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fe82b93fc1
Grab the HDR DPCD refresh timeout (time we need to wait after writing the sourc OUI before the HDR DPCD registers are ready) from the VBT. Windows doesn't even seem to have any default value for this, which is perhaps a bit weird since the VBT value is documented as TGL+ and I thought the HDR backlight stuff might already be used on earlier platforms. To play it safe I left the old hardcoded 30ms default in place. Digging through some internal stuff that seems to have been a number given by the vendor for one particularly slow TCON. Although I did see 50ms mentioned somewhere as well. Let's also include the value in the debug print to ease debugging, and toss in the customary connector id+name as well. The TGL Thinkpad T14 I have sets this to 0 btw. So the delay is now gone on this machine: [CONNECTOR:308:eDP-1] Detected Intel HDR backlight interface version 1 [CONNECTOR:308:eDP-1] Using Intel proprietary eDP backlight controls [CONNECTOR:308:eDP-1] SDR backlight is controlled through PWM [CONNECTOR:308:eDP-1] Using native PCH PWM for backlight control (controller=0) [CONNECTOR:308:eDP-1] Using AUX HDR interface for backlight control (range 0..496) [CONNECTOR:308:eDP-1] Performing OUI wait (0 ms) Cc: Lyude Paul <lyude@redhat.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230220164718.23117-1-ville.syrjala@linux.intel.com Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
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 Restructured Text 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.