drm/hisilicon/hibmc: Use GEM VRAM's prepare_fb() and cleanup_fb() helpers

This patch implements prepare_fb() and cleanup_fb() in hibmc with the
GEM VRAM helpers. In the current code, pinning the BO is performed by
hibmc_plane_atomic_update(), where the operation does not belong.

This patch also fixes a bug where the pinned BO was never unpinned.
Pinning multiple BOs would have exhaused the available VRAM and further
pin operations would have failed, leaving the display in a corrupt
state.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20191024081404.6978-4-tzimmermann@suse.de

diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
index cc4c417..6527a97 100644 (file)
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
@@ -96,7 +96,6 @@ static void hibmc_plane_atomic_update(struct drm_plane *plane,
 {
        struct drm_plane_state  *state  = plane->state;
        u32 reg;
-       int ret;
        s64 gpu_addr = 0;
        unsigned int line_l;
        struct hibmc_drm_private *priv = plane->dev->dev_private;
@@ -109,16 +108,9 @@ static void hibmc_plane_atomic_update(struct drm_plane *plane,
        hibmc_fb = to_hibmc_framebuffer(state->fb);
        gbo = drm_gem_vram_of_gem(hibmc_fb->obj);
 
-       ret = drm_gem_vram_pin(gbo, DRM_GEM_VRAM_PL_FLAG_VRAM);
-       if (ret) {
-               DRM_ERROR("failed to pin bo: %d", ret);
-               return;
-       }
        gpu_addr = drm_gem_vram_offset(gbo);
-       if (gpu_addr < 0) {
-               drm_gem_vram_unpin(gbo);
-               return;
-       }
+       if (WARN_ON_ONCE(gpu_addr < 0))
+               return; /* Bug: we didn't pin the BO to VRAM in prepare_fb. */
 
        writel(gpu_addr, priv->mmio + HIBMC_CRT_FB_ADDRESS);
 
@@ -157,6 +149,8 @@ static struct drm_plane_funcs hibmc_plane_funcs = {
 };
 
 static const struct drm_plane_helper_funcs hibmc_plane_helper_funcs = {
+       .prepare_fb     = drm_gem_vram_plane_helper_prepare_fb,
+       .cleanup_fb     = drm_gem_vram_plane_helper_cleanup_fb,
        .atomic_check = hibmc_plane_atomic_check,
        .atomic_update = hibmc_plane_atomic_update,
 };