linux-kernel - [ 123/175] [media] au8522: bug-fix: enable modulation AFTER tune (instead of before tuning)

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Message-Id: <20120330194850.627915339@linuxfoundation.org>
Date:	Fri, 30 Mar 2012 12:50:28 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Michael Krufky <mkrufky@...uxtv.org>,
	Mauro Carvalho Chehab <mchehab@...hat.com>
Subject: [ 123/175] [media] au8522: bug-fix: enable modulation AFTER tune (instead of before tuning)

3.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michael Krufky <mkrufky@...nellabs.com>

commit ef3d2dc366c8c32d58dbbf9898cfd4f853ff8fe0 upstream.

The au8522 driver programs the tuner after programming the demodulator,
but the tuner should be programmed first. This patch fixes this behavior.

EDIT: Apparantly Devin created a similar patch some time ago, but hasn't
submitted it for merge.  I never saw his patch, but I thank him anyhow
for his efforts.  In addition, Devin pointed out a flaw in my patch:

This newly generated patch takes Devin's comments into account.

Thanks-to: Devin Heitmueller <dheitmueller@...nellabs.com>
Signed-off-by: Michael Krufky <mkrufky@...uxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/dvb/frontends/au8522_dig.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/drivers/media/dvb/frontends/au8522_dig.c
+++ b/drivers/media/dvb/frontends/au8522_dig.c
@@ -588,11 +588,6 @@ static int au8522_set_frontend(struct dv
 	    (state->current_modulation == c->modulation))
 		return 0;
 
-	au8522_enable_modulation(fe, c->modulation);
-
-	/* Allow the demod to settle */
-	msleep(100);
-
 	if (fe->ops.tuner_ops.set_params) {
 		if (fe->ops.i2c_gate_ctrl)
 			fe->ops.i2c_gate_ctrl(fe, 1);
@@ -604,6 +599,11 @@ static int au8522_set_frontend(struct dv
 	if (ret < 0)
 		return ret;
 
+	/* Allow the tuner to settle */
+	msleep(100);
+
+	au8522_enable_modulation(fe, c->modulation);
+
 	state->current_frequency = c->frequency;
 
 	return 0;


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