Preallocate the format-conversion state's storage in the plane's
atomic_check function if a format conversion is necessary. Allows
the update to fail if no memory is available. Avoids the same
allocation within atomic_update, which may not fail.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
drivers/gpu/drm/solomon/ssd130x.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c
index dccbfe33edb5e..d3761e48bca12 100644
--- a/drivers/gpu/drm/solomon/ssd130x.c
+++ b/drivers/gpu/drm/solomon/ssd130x.c
@@ -638,6 +638,7 @@ static int ssd130x_primary_plane_atomic_check(struct drm_plane *plane,
struct ssd130x_device *ssd130x = drm_to_ssd130x(drm);
struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
struct ssd130x_plane_state *ssd130x_state = to_ssd130x_plane_state(plane_state);
+ struct drm_shadow_plane_state *shadow_plane_state = &ssd130x_state->base;
struct drm_crtc *crtc = plane_state->crtc;
struct drm_crtc_state *crtc_state = NULL;
const struct drm_format_info *fi;
@@ -662,6 +663,16 @@ static int ssd130x_primary_plane_atomic_check(struct drm_plane *plane,
pitch = drm_format_info_min_pitch(fi, 0, ssd130x->width);
+ if (plane_state->fb->format != fi) {
+ void *buf;
+
+ /* format conversion necessary; reserve buffer */
+ buf = drm_format_conv_state_reserve(&shadow_plane_state->fmtcnv_state,
+ pitch, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+ }
+
ssd130x_state->buffer = kcalloc(pitch, ssd130x->height, GFP_KERNEL);
if (!ssd130x_state->buffer)
return -ENOMEM;
--
2.42.0
