[media.git/next] media: venus: vdec: Make the range of us_per_frame explicit

[media-ci]

On Mon Jun 16 15:29:18 2025 +0000, Ricardo Ribalda wrote:
> Fps bigger than 0.000232829 fps, this fits in a 32 bit us_per_frame.
> There is no need to do a 64 bit division here.
> Also, the driver only works with whole fps.
> 
> Found by cocci:
> drivers/media/platform/qcom/venus/vdec.c:488:1-7: WARNING: do_div() does a 
> 64-by-32 division, please consider using div64_u64 instead.
> 
> Reviewed-by: Vikash Garodia <quic_vgaro...@quicinc.com>
> Reviewed-by: Bryan O'Donoghue <bryan.odonog...@linaro.org>
> Tested-by: Bryan O'Donoghue <bryan.odonog...@linaro.org> # qrb5615-rb5
> Signed-off-by: Ricardo Ribalda <riba...@chromium.org>
> Signed-off-by: Bryan O'Donoghue <b...@kernel.org>
> Signed-off-by: Hans Verkuil <hverk...@xs4all.nl>

Patch committed.

Thanks,
Hans Verkuil

 drivers/media/platform/qcom/venus/vdec.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

---

diff --git a/drivers/media/platform/qcom/venus/vdec.c 
b/drivers/media/platform/qcom/venus/vdec.c
index fca27be61f4b..29b0d6a5303d 100644
--- a/drivers/media/platform/qcom/venus/vdec.c
+++ b/drivers/media/platform/qcom/venus/vdec.c
@@ -482,8 +482,7 @@ static int vdec_s_parm(struct file *file, void *fh, struct 
v4l2_streamparm *a)
        do_div(us_per_frame, timeperframe->denominator);
 
        us_per_frame = clamp(us_per_frame, 1, USEC_PER_SEC);
-       fps = (u64)USEC_PER_SEC;
-       do_div(fps, us_per_frame);
+       fps = USEC_PER_SEC / (u32)us_per_frame;
        fps = min(VENUS_MAX_FPS, fps);
 
        inst->fps = fps;