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PIPEDSL is reading as 0 when in SRDENT(PSR1) or DEEP_SLEEP(PSR2). On wake-up scanline counting starts from vblank_start - 1. We don't know if wake-up is already ongoing when evasion starts. In worst case PIPEDSL could start reading valid value right after checking the scanline. In this scenario we wouldn't have enough time to write all registers. To tackle this evade scanline 0 as well. As a drawback we have 1 frame delay in flip when waking up. v2: - use intel_dsb_emit_wait_dsl - add evasion of scanline 0 also for Panel Replay Signed-off-by: Jouni Högander <jouni.hogander@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20250213064804.2077127-11-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 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.