Hi Prashant,
On 03/20/2015 03:48 PM, Prashant Laddha wrote:
> In addition to v4l2_find_dv_timings_cap(), where timings are searched
> against the list of preset timings, the incoming timing from v4l2-ctl
> is checked against CVT and GTF standards. If it confirms to be CVT or
> GTF, it is treated as valid timing and vivid format is updated with
> new timings.
>
> Cc: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> Signed-off-by: Prashant Laddha <prladdha@xxxxxxxxx>
> ---
> drivers/media/platform/vivid/vivid-vid-cap.c | 61 +++++++++++++++++++++++++++-
> 1 file changed, 60 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/platform/vivid/vivid-vid-cap.c b/drivers/media/platform/vivid/vivid-vid-cap.c
> index 867a29a..b4ec9b0 100644
> --- a/drivers/media/platform/vivid/vivid-vid-cap.c
> +++ b/drivers/media/platform/vivid/vivid-vid-cap.c
> @@ -1552,6 +1552,63 @@ int vivid_vid_cap_s_std(struct file *file, void *priv, v4l2_std_id id)
> return 0;
> }
>
> +static void find_aspect_ratio(u32 width, u32 height,
> + u32 *num, u32 *denom)
> +{
> + if (!(height % 3) && ((height * 4 / 3) == width)) {
> + *num = 4;
> + *denom = 3;
> + } else if (!(height % 9) && ((height * 16 / 9) == width)) {
> + *num = 16;
> + *denom = 9;
> + } else if (!(height % 10) && ((height * 16 / 10) == width)) {
> + *num = 16;
> + *denom = 10;
> + } else if (!(height % 4) && ((height * 5 / 4) == width)) {
> + *num = 5;
> + *denom = 4;
> + } else if (!(height % 9) && ((height * 15 / 9) == width)) {
> + *num = 15;
> + *denom = 9;
> + } else { /* default to 16:9 */
> + *num = 16;
> + *denom = 9;
> + }
> +}
> +
> +static bool valid_cvt_gtf_timings(struct v4l2_dv_timings *timings)
> +{
> + struct v4l2_bt_timings *bt = &timings->bt;
> + u32 total_h_pixel;
> + u32 total_v_lines;
> + u32 h_freq;
> +
> + if (!v4l2_valid_dv_timings(timings, &vivid_dv_timings_cap,
> + NULL, NULL))
> + return false;
> +
> + total_h_pixel = V4L2_DV_BT_FRAME_WIDTH(bt);
> + total_v_lines = V4L2_DV_BT_FRAME_HEIGHT(bt);
> +
> + h_freq = (u32)bt->pixelclock / total_h_pixel;
> +
> + if (bt->standards == V4L2_DV_BT_STD_CVT)
This test and the next isn't right. Apologies that I didn't see that
when I reviewed v1.
The correct test is:
if (bt->standard == 0 || (bt->standards & V4L2_DV_BT_STD_CVT))
> + return v4l2_detect_cvt(total_v_lines, h_freq, bt->vsync,
> + bt->polarities, timings);
Just returning here isn't right either: if a CVT format is detected, then
it can return true, otherwise it should continue and try the GTF format.
> +
> + if (bt->standards == V4L2_DV_BT_STD_GTF) {
And this becomes:
if (bt->standard == 0 || (bt->standards & V4L2_DV_BT_STD_GTF))
When it comes to autodetecting formats the driver can often detect
only a few timing properties, and it is rarely able to say if it
will be a CVT or GTF timing. So often they leave bt->standard to 0.
Regards,
Hans
> + struct v4l2_fract aspect_ratio;
> +
> + find_aspect_ratio(bt->width, bt->height,
> + &aspect_ratio.numerator,
> + &aspect_ratio.denominator);
> + return v4l2_detect_gtf(total_v_lines, h_freq, bt->vsync,
> + bt->polarities, aspect_ratio, timings);
> + }
> +
> + return false;
> +}
> +
> int vivid_vid_cap_s_dv_timings(struct file *file, void *_fh,
> struct v4l2_dv_timings *timings)
> {
> @@ -1561,8 +1618,10 @@ int vivid_vid_cap_s_dv_timings(struct file *file, void *_fh,
> return -ENODATA;
> if (vb2_is_busy(&dev->vb_vid_cap_q))
> return -EBUSY;
> +
> if (!v4l2_find_dv_timings_cap(timings, &vivid_dv_timings_cap,
> - 0, NULL, NULL))
> + 0, NULL, NULL)
> + && !valid_cvt_gtf_timings(timings))
> return -EINVAL;
> if (v4l2_match_dv_timings(timings, &dev->dv_timings_cap, 0))
> return 0;
>
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