From: Philipp Zabel <p.zabel@pengutronix.de>
Date: Mon, 23 Mar 2015 10:16:21 +0000 (+0100)
Subject: gpu: ipu-v3: turns out the IPU can only downsize 4:1
X-Git-Tag: firefly_0821_release~176^2~1915^2~11^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8f361b279f76b1e9548c9b3e59da63d3dec11bea;p=firefly-linux-kernel-4.4.55.git

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

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@pengutronix.de>
---

diff --git a/drivers/gpu/ipu-v3/ipu-ic.c b/drivers/gpu/ipu-v3/ipu-ic.c
index ad75588e1629..1dcb96ccda66 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;
 	}