The maximum pitch constraint for the hardware is expressed in pixels.
Convert it to bytes to validate frame buffer creation, as frame buffer
pitches are expressed in bytes.
Reported-by: Phil Edworthy <phil.edworthy@xxxxxxxxxxx>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/rcar-du/rcar_du_kms.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
index 3875854..7eabbd7 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
@@ -135,7 +135,9 @@ rcar_du_fb_create(struct drm_device *dev, struct drm_file *file_priv,
{
struct rcar_du_device *rcdu = dev->dev_private;
const struct rcar_du_format_info *format;
+ unsigned int max_pitch;
unsigned int align;
+ unsigned int bpp;
format = rcar_du_format_info(mode_cmd->pixel_format);
if (format == NULL) {
@@ -144,13 +146,20 @@ rcar_du_fb_create(struct drm_device *dev, struct drm_file *file_priv,
return ERR_PTR(-EINVAL);
}
+ /*
+ * The pitch and alignment constraints are expressed in pixels on the
+ * hardware side and in bytes in the DRM API.
+ */
+ bpp = format->planes == 2 ? 1 : format->bpp / 8;
+ max_pitch = 4096 * bpp;
+
if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
align = 128;
else
- align = 16 * format->bpp / 8;
+ align = 16 * bpp;
if (mode_cmd->pitches[0] & (align - 1) ||
- mode_cmd->pitches[0] >= 8192) {
+ mode_cmd->pitches[0] >= max_pitch) {
dev_dbg(dev->dev, "invalid pitch value %u\n",
mode_cmd->pitches[0]);
return ERR_PTR(-EINVAL);
--
Regards,
Laurent Pinchart
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