diff mbox

[07/12] au8522: fix lock detection to be more reliable.

Message ID 1492643635-30823-8-git-send-email-dheitmueller@kernellabs.com (mailing list archive)
State Accepted, archived
Delegated to: Hans Verkuil
Headers

Commit Message

Devin Heitmueller April 19, 2017, 11:13 p.m. UTC 
  Only looking at the lock register causes the status to float
between locked and not locked when there is no signal.  So improve
the logic to also examine the state of the FSC PLL, which results
in the lock status being consistently reported.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
---
 drivers/media/dvb-frontends/au8522_decoder.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox

Patch

diff --git a/drivers/media/dvb-frontends/au8522_decoder.c b/drivers/media/dvb-frontends/au8522_decoder.c
index 5e21640..343dc92 100644
--- a/drivers/media/dvb-frontends/au8522_decoder.c
+++ b/drivers/media/dvb-frontends/au8522_decoder.c
@@ -623,10 +623,12 @@  static int au8522_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
 	int val = 0;
 	struct au8522_state *state = to_state(sd);
 	u8 lock_status;
+	u8 pll_status;
 
 	/* Interrogate the decoder to see if we are getting a real signal */
 	lock_status = au8522_readreg(state, 0x00);
-	if (lock_status == 0xa2)
+	pll_status = au8522_readreg(state, 0x7e);
+	if ((lock_status == 0xa2) && (pll_status & 0x10))
 		vt->signal = 0xffff;
 	else
 		vt->signal = 0x00;