diff mbox series

[3/3] media: i2c: adv748x: Report correct DV timings for pattern generator

Message ID 20230222221249.1324102-4-niklas.soderlund+renesas@ragnatech.se (mailing list archive)
State Accepted
Delegated to: Hans Verkuil
Headers
Series media: i2c: adv748x: Enable pattern generator without external HDMI source |

Commit Message

Niklas Söderlund Feb. 22, 2023, 10:12 p.m. UTC 
  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>
---
 drivers/media/i2c/adv748x/adv748x-hdmi.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
diff mbox series

Patch

diff --git a/drivers/media/i2c/adv748x/adv748x-hdmi.c b/drivers/media/i2c/adv748x/adv748x-hdmi.c
index 47688d1b6833..400d71c2745c 100644
--- a/drivers/media/i2c/adv748x/adv748x-hdmi.c
+++ b/drivers/media/i2c/adv748x/adv748x-hdmi.c
@@ -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;