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drm/udl: Move log-cpp code out of udl_damage_handler()

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Computing the cpp value's logarithm in a separate helper function makes
the damage-handler code more readable.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191206085954.9697-6-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2019-12-06 09:59:52 +01:00
parent ffc90486e3
commit cd45e30a70
1 changed files with 12 additions and 5 deletions
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17
drivers/gpu/drm/udl/udl_fb.c
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@ -58,6 +58,13 @@ static uint16_t rgb16(uint32_t col)
}
#endif
static long udl_log_cpp(unsigned int cpp)
{
if (WARN_ON(!is_power_of_2(cpp)))
return -EINVAL;
return __ffs(cpp);
}
static int udl_aligned_damage_clip(struct drm_rect *clip, int x, int y,
int width, int height)
{
@ -92,11 +99,6 @@ int udl_handle_damage(struct drm_framebuffer *fb, int x, int y,
int log_bpp;
void *vaddr;
if (WARN_ON(!is_power_of_2(fb->format->cpp[0])))
return -EINVAL;
log_bpp = __ffs(fb->format->cpp[0]);
spin_lock(&udl->active_fb_16_lock);
if (udl->active_fb_16 != fb) {
spin_unlock(&udl->active_fb_16_lock);
@ -104,6 +106,11 @@ int udl_handle_damage(struct drm_framebuffer *fb, int x, int y,
}
spin_unlock(&udl->active_fb_16_lock);
ret = udl_log_cpp(fb->format->cpp[0]);
if (ret < 0)
return ret;
log_bpp = ret;
ret = udl_aligned_damage_clip(&clip, x, y, width, height);
if (ret)
return ret;