drm/udl: Store active framebuffer in device structure

The framebuffer's 'active_16' flag signals which framebuffer to flush
to device memory. Moving the 'active_16' state from struct udl_framebuffer
into struct udl_device prepares for using the generic GEM framebuffer.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191114141025.32198-4-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/udl/udl_drv.h b/drivers/gpu/drm/udl/udl_drv.h
index be585e3..a0946b9 100644 (file)
--- a/drivers/gpu/drm/udl/udl_drv.h
+++ b/drivers/gpu/drm/udl/udl_drv.h
@@ -53,6 +53,10 @@ struct udl_device {
        struct usb_device *udev;
        struct drm_crtc *crtc;
 
+       /* active framebuffer on the 16-bit channel */
+       const struct drm_framebuffer *active_fb_16;
+       spinlock_t active_fb_16_lock;
+
        struct mutex gem_lock;
 
        int sku_pixel_limit;
@@ -73,7 +77,6 @@ struct udl_device {
 struct udl_framebuffer {
        struct drm_framebuffer base;
        struct drm_gem_shmem_object *shmem;
-       bool active_16; /* active on the 16-bit channel */
 };
 
 #define to_udl_fb(x) container_of(x, struct udl_framebuffer, base)

diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
index a9e6ec3..e9a4bbd 100644 (file)
--- a/drivers/gpu/drm/udl/udl_fb.c
+++ b/drivers/gpu/drm/udl/udl_fb.c
@@ -78,8 +78,12 @@ int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
        BUG_ON(!is_power_of_2(fb->base.format->cpp[0]));
        log_bpp = __ffs(fb->base.format->cpp[0]);
 
-       if (!fb->active_16)
+       spin_lock(&udl->active_fb_16_lock);
+       if (udl->active_fb_16 != &fb->base) {
+               spin_unlock(&udl->active_fb_16_lock);
                return 0;
+       }
+       spin_unlock(&udl->active_fb_16_lock);
 
        vaddr = drm_gem_shmem_vmap(&fb->shmem->base);
        if (IS_ERR(vaddr)) {
@@ -153,14 +157,19 @@ static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
                                      unsigned num_clips)
 {
        struct udl_framebuffer *ufb = to_udl_fb(fb);
+       struct udl_device *udl = fb->dev->dev_private;
        struct dma_buf_attachment *import_attach;
        int i;
        int ret = 0;
 
        drm_modeset_lock_all(fb->dev);
 
-       if (!ufb->active_16)
+       spin_lock(&udl->active_fb_16_lock);
+       if (udl->active_fb_16 != fb) {
+               spin_unlock(&udl->active_fb_16_lock);
                goto unlock;
+       }
+       spin_unlock(&udl->active_fb_16_lock);
 
        import_attach = ufb->shmem->base.import_attach;
 

diff --git a/drivers/gpu/drm/udl/udl_main.c b/drivers/gpu/drm/udl/udl_main.c
index 9b091b5..a23218f 100644 (file)
--- a/drivers/gpu/drm/udl/udl_main.c
+++ b/drivers/gpu/drm/udl/udl_main.c
@@ -317,6 +317,9 @@ int udl_init(struct udl_device *udl)
 
        DRM_DEBUG("\n");
 
+       udl->active_fb_16 = NULL;
+       spin_lock_init(&udl->active_fb_16_lock);
+
        mutex_init(&udl->gem_lock);
 
        if (!udl_parse_vendor_descriptor(dev, udl->udev)) {

diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c
index 6582c9d..44a741f 100644 (file)
--- a/drivers/gpu/drm/udl/udl_modeset.c
+++ b/drivers/gpu/drm/udl/udl_modeset.c
@@ -332,11 +332,9 @@ static int udl_crtc_mode_set(struct drm_crtc *crtc,
 
        wrptr = udl_dummy_render(wrptr);
 
-       if (old_fb) {
-               struct udl_framebuffer *uold_fb = to_udl_fb(old_fb);
-               uold_fb->active_16 = false;
-       }
-       ufb->active_16 = true;
+       spin_lock(&udl->active_fb_16_lock);
+       udl->active_fb_16 = &ufb->base;
+       spin_unlock(&udl->active_fb_16_lock);
        udl->mode_buf_len = wrptr - buf;
 
        /* damage all of it */
@@ -364,13 +362,11 @@ static int udl_crtc_page_flip(struct drm_crtc *crtc,
 {
        struct udl_framebuffer *ufb = to_udl_fb(fb);
        struct drm_device *dev = crtc->dev;
+       struct udl_device *udl = dev->dev_private;
 
-       struct drm_framebuffer *old_fb = crtc->primary->fb;
-       if (old_fb) {
-               struct udl_framebuffer *uold_fb = to_udl_fb(old_fb);
-               uold_fb->active_16 = false;
-       }
-       ufb->active_16 = true;
+       spin_lock(&udl->active_fb_16_lock);
+       udl->active_fb_16 = fb;
+       spin_unlock(&udl->active_fb_16_lock);
 
        udl_handle_damage(ufb, 0, 0, fb->width, fb->height);