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authorThomas Zimmermann <tzimmermann@suse.de>2019-07-05 10:31:00 +0300
committerThomas Zimmermann <tzimmermann@suse.de>2019-07-09 11:25:02 +0300
commitf458579ede0b721418f7fc9f0eb624ca058ea0ea (patch)
treeb0cf508c008abc7c29ac7974a486363a40f4e415 /drivers/gpu/drm/drm_fb_helper.c
parentcf1ca9aeb930df074bb5bbcde55f935fec04e529 (diff)
downloadlinux-f458579ede0b721418f7fc9f0eb624ca058ea0ea.tar.xz
drm/fb-helper: Instanciate shadow FB if configured in device's mode_config
Generic framebuffer emulation uses a shadow buffer for framebuffers with dirty() function. If drivers want to use the shadow FB without such a function, they can now set prefer_shadow or prefer_shadow_fbdev in their mode_config structures. The former flag is exported to userspace, the latter flag is fbdev-only. v3: * only schedule dirty worker if fbdev uses shadow fb * test shadow fb settings with boolean operators * use bool for struct drm_mode_config.prefer_shadow_fbdev * fix documentation comments Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Noralf Trønnes <noralf@tronnes.org> Tested-by: Noralf Trønnes <noralf@tronnes.org> Link: https://patchwork.freedesktop.org/patch/315834/
Diffstat (limited to 'drivers/gpu/drm/drm_fb_helper.c')
-rw-r--r--drivers/gpu/drm/drm_fb_helper.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 7ba6a0255821..a7ba5b4902d6 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -421,7 +421,9 @@ static void drm_fb_helper_dirty_work(struct work_struct *work)
return;
drm_fb_helper_dirty_blit_real(helper, &clip_copy);
}
- helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1);
+ if (helper->fb->funcs->dirty)
+ helper->fb->funcs->dirty(helper->fb, NULL, 0, 0,
+ &clip_copy, 1);
if (helper->buffer)
drm_client_buffer_vunmap(helper->buffer);
@@ -613,6 +615,16 @@ void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
}
EXPORT_SYMBOL(drm_fb_helper_unlink_fbi);
+static bool drm_fbdev_use_shadow_fb(struct drm_fb_helper *fb_helper)
+{
+ struct drm_device *dev = fb_helper->dev;
+ struct drm_framebuffer *fb = fb_helper->fb;
+
+ return dev->mode_config.prefer_shadow_fbdev ||
+ dev->mode_config.prefer_shadow ||
+ fb->funcs->dirty;
+}
+
static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y,
u32 width, u32 height)
{
@@ -620,7 +632,7 @@ static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y,
struct drm_clip_rect *clip = &helper->dirty_clip;
unsigned long flags;
- if (!helper->fb->funcs->dirty)
+ if (!drm_fbdev_use_shadow_fb(helper))
return;
spin_lock_irqsave(&helper->dirty_lock, flags);
@@ -2213,7 +2225,7 @@ int drm_fb_helper_generic_probe(struct drm_fb_helper *fb_helper,
drm_fb_helper_fill_info(fbi, fb_helper, sizes);
- if (fb->funcs->dirty) {
+ if (drm_fbdev_use_shadow_fb(fb_helper)) {
struct fb_ops *fbops;
void *shadow;