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gpu: ipu-v3: image-convert: Fix image downsize coefficients 

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: 70b9b6b3bc ("gpu: ipu-v3: image-convert: calculate per-tile
resize coefficients")

Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Steve Longerbeam 2019-06-11 18:16:57 -07:00 committed by Philipp Zabel
parent bca4d70cf1
commit 912bbf7e9c
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/ipu-v3/ipu-image-convert.c
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@ -400,12 +400,14 @@ 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++;
}