[PATCH] gpu: ipu-v3: turns out the IPU can only downsize 4:1

[Philipp Zabel]

The value for downsizing 8:1 is marked as reserved in the technical reference
manual and the documentation states downsizing capability up to 4:1 only.

Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
---
 drivers/gpu/ipu-v3/ipu-ic.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/ipu-v3/ipu-ic.c b/drivers/gpu/ipu-v3/ipu-ic.c
index ad75588..1dcb96c 100644
--- a/drivers/gpu/ipu-v3/ipu-ic.c
+++ b/drivers/gpu/ipu-v3/ipu-ic.c
@@ -297,8 +297,8 @@ static int calc_resize_coeffs(struct ipu_ic *ic,
                return -EINVAL;
        }

-       /* Cannot downsize more than 8:1 */
-       if ((out_size << 3) < in_size) {
+       /* Cannot downsize more than 4:1 */
+       if ((out_size << 2) < in_size) {
                dev_err(ipu->dev, "Unsupported downsize\n");
                return -EINVAL;
        }
-- 
2.1.4