[PATCH 5.1 059/138] gpu: ipu-v3: image-convert: Fix image downsize coefficients

[Greg Kroah-Hartman]

[ Upstream commit 912bbf7e9ca422099935dd69d3ff0fd62db24882 ]

The output of the IC downsizer unit in both dimensions must be <= 1024
before being passed to the IC resizer unit. This was causing corrupted
images when:

input_dim > 1024, and
input_dim / 2 < output_dim < input_dim

Some broken examples were 1920x1080 -> 1024x768 and 1920x1080 ->
1280x1080.

Fixes: 70b9b6b3bcb21 ("gpu: ipu-v3: image-convert: calculate per-tile
resize coefficients")

Signed-off-by: Steve Longerbeam <slongerb...@gmail.com>
Signed-off-by: Philipp Zabel <p.za...@pengutronix.de>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/gpu/ipu-v3/ipu-image-convert.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/ipu-v3/ipu-image-convert.c 
b/drivers/gpu/ipu-v3/ipu-image-convert.c
index 19d3b85e0e98..e9803e2151f9 100644
--- a/drivers/gpu/ipu-v3/ipu-image-convert.c
+++ b/drivers/gpu/ipu-v3/ipu-image-convert.c
@@ -409,12 +409,14 @@ static int calc_image_resize_coefficients(struct 
ipu_image_convert_ctx *ctx,
        if (WARN_ON(resized_width == 0 || resized_height == 0))
                return -EINVAL;
 
-       while (downsized_width >= resized_width * 2) {
+       while (downsized_width > 1024 ||
+              downsized_width >= resized_width * 2) {
                downsized_width >>= 1;
                downsize_coeff_h++;
        }
 
-       while (downsized_height >= resized_height * 2) {
+       while (downsized_height > 1024 ||
+              downsized_height >= resized_height * 2) {
                downsized_height >>= 1;
                downsize_coeff_v++;
        }
-- 
2.20.1