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media: venus: helpers: Fix ALIGN() of non power of two 

ALIGN() expects its second argument to be a power of 2, otherwise
incorrect results are produced for some inputs. The output can be
both larger or smaller than what is expected.

For example, ALIGN(304, 192) equals 320 instead of 384, and
ALIGN(65, 192) equals 256 instead of 192.

However, nestling two ALIGN() as is done in this case seem to only
produce results equal to or bigger than the expected result if ALIGN()
had handled non powers of two, and that in turn results in framesizes
that are either the correct size or too large.

Fortunately, since 192 * 4 / 3 equals 256, it turns out that one ALIGN()
is sufficient.

Fixes: ab1eda449c ("media: venus: vdec: handle 10bit bitstreams")
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: Stanimir Varbanov <stanimir.k.varbanov@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Rikard Falkeborn 2020-09-12 20:03:01 +01:00 committed by Mauro Carvalho Chehab
parent 751be5c63f
commit 927e78ac8b
1 changed files with 2 additions and 2 deletions
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4
drivers/media/platform/qcom/venus/helpers.c
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@ -1031,8 +1031,8 @@ static u32 get_framesize_raw_yuv420_tp10_ubwc(u32 width, u32 height)
u32 extradata = SZ_16K;
u32 size;
y_stride = ALIGN(ALIGN(width, 192) * 4 / 3, 256);
uv_stride = ALIGN(ALIGN(width, 192) * 4 / 3, 256);
y_stride = ALIGN(width * 4 / 3, 256);
uv_stride = ALIGN(width * 4 / 3, 256);
y_sclines = ALIGN(height, 16);
uv_sclines = ALIGN((height + 1) >> 1, 16);