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36d3571698
Panel power off delay is the time the panel power needs to remain off after being switched off, before it can be switched on again. For the purpose of respecting panel power off delay at driver probe, assuming the panel was last switched off at driver probe is overly pessimistic. If the panel was never on, we'd end up waiting for no reason. We don't know what has happened before kernel boot, but we can make some assumptions: - The panel may have been switched off right before kernel boot by some pre-os environment. - After kernel boot, the panel may only be switched off by i915. - At i915 driver probe, only a previously loaded and removed i915 may have switched the panel power off. With these assumptions, we can initialize the last power off time to kernel boot time, if we also ensure i915 driver remove waits for the panel power off delay after switching panel power off. This shaves off the time it takes from kernel boot to i915 probe from the first panel enable, if (and only if) the panel was not already enabled at boot. The encoder destroy hook is pretty much the last place where we can wait, right after we've ensured the panel power has been switched off, and before the whole encoder is destroyed. Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/7417 Cc: Lee Shawn C <shawn.c.lee@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Tested-by: Lee Shawn C <shawn.c.lee@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20221116150657.1347504-1-jani.nikula@intel.com |
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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.