kernel/linux.git/drivers/video/fbdev/core/cfbimgblt.c, branch v6.7

fbdev: Fix cfb_imageblit() for arbitrary image widths

2022-03-24T23:55:54+00:00

Commit 0d03011894d2 ("fbdev: Improve performance of cfb_imageblit()") broke cfb_imageblit() for image widths that are not aligned to 8-bit boundaries. Fix this by handling the trailing pixels on each line separately. The performance improvements in the original commit do not regress by this change. Signed-off-by: Thomas Zimmermann Fixes: 0d03011894d2 ("fbdev: Improve performance of cfb_imageblit()") Reported-by: Marek Szyprowski Cc: Thomas Zimmermann Cc: Javier Martinez Canillas Cc: Sam Ravnborg Tested-by: Marek Szyprowski Acked-by: Daniel Vetter Reviewed-by: Javier Martinez Canillas Tested-by: Guenter Roeck Signed-off-by: Dave Airlie Link: https://patchwork.freedesktop.org/patch/msgid/20220313192952.12058-3-tzimmermann@suse.de

fbdev: Improve performance of cfb_imageblit()

2022-03-02T19:22:33+00:00

Improve the performance of cfb_imageblit() by manually unrolling the inner blitting loop and moving some invariants out. The compiler failed to do this automatically. This change keeps cfb_imageblit() in sync with sys_imagebit(). A microbenchmark measures the average number of CPU cycles for cfb_imageblit() after a stabilizing period of a few minutes (i7-4790, FullHD, simpledrm, kernel with debugging). cfb_imageblit(), new: 15724 cycles cfb_imageblit(): old: 30566 cycles In the optimized case, cfb_imageblit() is now ~2x faster than before. v3: * fix commit description (Pekka) Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas Acked-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20220223193804.18636-5-tzimmermann@suse.de

fbdev: Remove trailing whitespaces from cfbimgblt.c

2022-03-02T19:22:06+00:00

Fix coding style. No functional changes. Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas Acked-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20220223193804.18636-4-tzimmermann@suse.de

fbdev: move fbdev core files to separate directory

2014-04-17T05:10:19+00:00

Instead of having fbdev framework core files at the root fbdev directory, mixed with random fbdev device drivers, move the fbdev core files to a separate core directory. This makes it much clearer which of the files are actually part of the fbdev framework, and which are part of device drivers. Signed-off-by: Tomi Valkeinen Acked-by: Laurent Pinchart Acked-by: Geert Uytterhoeven Acked-by: Rob Clark Acked-by: Jingoo Han Acked-by: Daniel Vetter