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media: i2c: adv748x: Report correct DV timings for pattern generator

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If the pattern generator is enabled the device shall not be queried for
timings. Instead the timings programmed shall be reported as they are
the ones being used to generate the pattern.

Before this change an external HDMI source needed to be connected for
the pattern generator to work. The driver would query this external
HDMI source for timings and program the pattern generator using those.

With this change the user can control the timings and have the pattern
generator work without the need of an external HDMI source being
connected.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Niklas Söderlund 2023-02-22 23:12:49 +01:00 committed by Hans Verkuil
parent 8a7bc891b9
commit 092e321ab0
1 changed files with 10 additions and 0 deletions
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10
drivers/media/i2c/adv748x/adv748x-hdmi.c
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@ -283,6 +283,16 @@ static int adv748x_hdmi_query_dv_timings(struct v4l2_subdev *sd,
memset(timings, 0, sizeof(struct v4l2_dv_timings));
/*
* If the pattern generator is enabled the device shall not be queried
* for timings. Instead the timings programmed shall be reported as they
* are the ones being used to generate the pattern.
*/
if (cp_read(state, ADV748X_CP_PAT_GEN) & ADV748X_CP_PAT_GEN_EN) {
*timings = hdmi->timings;
return 0;
}
if (!adv748x_hdmi_has_signal(state))
return -ENOLINK;