ef39826c12
Legacy cursor APIs are handled by intel_legacy_cursor_update(), that calls drm_atomic_helper_update_plane() when going through the slow/atomic path to update cursor, what was the case for PSR2 selective fetch. drm_atomic_helper_update_plane() sets drm_atomic_state->legacy_cursor_update to true when updating the cursor plane, to allow several cursor updates to happen within the same frame, as userspace does that. If drivers waited for a vblank increment at the end of every cursor movement that would cause a visible lag in the cursor. But this optimization do not properly work with PSR2 selective fetch dirt area calculation, for example if within a single frame the cursor had 3 moves the final dirt area programmed to PSR2_MAN_TRK_CTL would be based in the second movement as old state and third movement as new state, not updating the area where cursor was in the first state. So here switching back to the fast path approach in intel_legacy_cursor_update() and handling cursor movements as frontbuffer rendering(psr_force_hw_tracking_exit()), that is not the most optimal for power-savings but is the solution that we have until mailbox style updates is implemented. Also removing the cursor workaround as not it is properly undestand the issue and is know that it will never cover all the cases. Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com> Signed-off-by: José Roberto de Souza <jose.souza@intel.com> Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210930001409.254817-5-jose.souza@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.