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| author | Thomas Zimmermann <tzimmermann@suse.de> | 2022-02-09 17:16:17 +0100 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2022-02-10 14:49:31 +0100 |
| commit | ded74cafeea9311c1eaf6fccce963de2516145f7 (patch) | |
| tree | f67989ea4114dfcd02ce2aaf14631f7910fb2299 /drivers/gpu/drm/drm_fb_helper.c | |
| parent | fe23b56f56532dcc5e49e83e20333b97919dec53 (diff) | |
| download | linux-ded74cafeea9311c1eaf6fccce963de2516145f7.tar.gz linux-ded74cafeea9311c1eaf6fccce963de2516145f7.tar.bz2 linux-ded74cafeea9311c1eaf6fccce963de2516145f7.zip | |
drm/fb-helper: Clip damage area horizontally
Clip the damage area horizontally if only a single scanline has been
changed. This is helpful to reduce the memcpy overhead for small writes.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220209161617.3553-6-tzimmermann@suse.de
Diffstat (limited to 'drivers/gpu/drm/drm_fb_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_fb_helper.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 4d5410dd96c5..e05a7bd6fb12 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -690,6 +690,18 @@ static void drm_fb_helper_memory_range_to_clip(struct fb_info *info, off_t off, u32 x2 = info->var.xres; u32 y2 = DIV_ROUND_UP(end, info->fix.line_length); + if ((y2 - y1) == 1) { + /* + * We've only written to a single scanline. Try to reduce + * the number of horizontal pixels that need an update. + */ + off_t bit_off = (off % info->fix.line_length) * 8; + off_t bit_end = (end % info->fix.line_length) * 8; + + x1 = bit_off / info->var.bits_per_pixel; + x2 = DIV_ROUND_UP(bit_end, info->var.bits_per_pixel); + } + drm_rect_init(clip, x1, y1, x2 - x1, y2 - y1); } |