commit 460b6c0831cb ("[media] tvp5150: Add s_stream subdev operation
support") added a logic that overrides TVP5150_CONF_SHARED_PIN setting,
depending on the type of bus set via the .set_fmt() subdev callback.
This is known to cause trobules on devices that don't use a V4L2
subdev devnode, and a fix for it was made by commit 47de9bf8931e
("[media] tvp5150: Fix breakage for serial usage"). Unfortunately,
such fix doesn't consider the case of progressive video inputs,
causing chroma decoding issues on such videos, as it overrides not
only the type of video output, but also other unrelated bits.
So, instead of trying to guess, let's detect if the device configuration
is set via Device Tree. If not, just ignore the new logic, restoring
the original behavior.
Fixes: 460b6c0831cb ("[media] tvp5150: Add s_stream subdev operation support")
Cc: Devin Heitmueller <dheitmuel...@kernellabs.com>
Cc: Javier Martinez Canillas <jav...@osg.samsung.com>
Cc: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Cc: sta...@vger.kernel.org
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
---
changes since version 2:
- fixed settings for register 0x0d
- tested on WinTV USB2 with S-Video input
I'll do an extra test with HVR-950 on both S-Video and composite soon enough
changes since version 1: added a notice about what's broken at the
tvp5150_stream() logic, and improved patch's description.
changes since RFC: don't touch at enum v4l2_mbus_type.
drivers/media/i2c/tvp5150.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/drivers/media/i2c/tvp5150.c b/drivers/media/i2c/tvp5150.c
index 6737685d5be5..8b9d2fad17df 100644
--- a/drivers/media/i2c/tvp5150.c
+++ b/drivers/media/i2c/tvp5150.c
@@ -57,6 +57,7 @@ struct tvp5150 {
u16 rom_ver;
enum v4l2_mbus_type mbus_type;
+ bool has_dt;
};
static inline struct tvp5150 *to_tvp5150(struct v4l2_subdev *sd)
@@ -1053,6 +1054,20 @@ static int tvp5150_s_stream(struct v4l2_subdev *sd, int
enable)
/* Output format: 8-bit ITU-R BT.656 with embedded syncs */
int val = 0x09;
+ if (!decoder->has_dt)
+ return 0;
+
+ /*
+ * FIXME: the logic below is hardcoded to work with some OMAP3
+ * hardware with tvp5151. As such, it hardcodes values for
+ * both TVP5150_CONF_SHARED_PIN and TVP5150_MISC_CTL, and ignores
+ * what was set before at the driver. Ideally, we should have
+ * DT nodes describing the setup, instead of hardcoding those
+ * values, and doing a read before writing values to
+ * TVP5150_MISC_CTL, but any patch adding support for it should
+ * keep DT backward-compatible.
+ */
+
/* Output format: 8-bit 4:2:2 YUV with discrete sync */
if (decoder->mbus_type == V4L2_MBUS_PARALLEL)
val = 0x0d;
@@ -1471,6 +1486,7 @@ static int tvp5150_probe(struct i2c_client *c,
dev_err(sd->dev, "DT parsing error: %d\n", res);
return res;
}
+ decoder->has_dt = true;
} else {
/* Default to BT.656 embedded sync */
core->mbus_type = V4L2_MBUS_BT656;
--
2.9.3
--
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