drm/format-helper: Add drm_fb_xrgb8888_to_mono_reversed()
commit 120dd7b1b3c14ba47ff4aacd91cb0f661356b414 from https://nv-tegra.nvidia.com/r/3rdparty/canonical/linux-jammy.git jetson_36.3 Add support to convert from XR24 to reversed monochrome for drivers that control monochromatic display panels, that only have 1 bit per pixel. The function does a line-by-line conversion doing an intermediate step first from XR24 to 8-bit grayscale and then to reversed monochrome. The drm_fb_gray8_to_mono_reversed_line() helper was based on code from drivers/gpu/drm/tiny/repaper.c driver. Signed-off-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Maxime Ripard <maxime@cerno.tech> Link: https://patchwork.freedesktop.org/patch/msgid/20220214133710.3278506-3-javierm@redhat.com (cherry picked from commit bcf8b616 ) Change-Id: Ifeadced4d47db1ea22a00f90579d0820dbe95a85 Signed-off-by: Thierry Reding <treding@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/3rdparty/canonical/linux-jammy/+/2985834 Reviewed-by: svcacv <svcacv@nvidia.com> Reviewed-by: Jonathan Hunter <jonathanh@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com> Signed-off-by: Rajeshkumar Ramasamy <rajeshkumar.ramasamy@windriver.com>
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