[3.13.y.z extended stable] Patch "[media] xc4000: Fix get_frequency()" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    [media] xc4000: Fix get_frequency()

to the linux-3.13.y-queue branch of the 3.13.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.13.y-queue

This patch is scheduled to be released in version 3.13.11.7.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 0335413692b53e8a6dc351a5d8a85e29df9ea931 Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <m.chehab at samsung.com>
Date: Mon, 21 Jul 2014 13:28:15 -0300
Subject: [media] xc4000: Fix get_frequency()

commit 4c07e32884ab69574cfd9eb4de3334233c938071 upstream.

The programmed frequency on xc4000 is not the middle
frequency, but the initial frequency on the bandwidth range.
However, the DVB API works with the middle frequency.

This works fine on set_frontend, as the device calculates
the needed offset. However, at get_frequency(), the returned
value is the initial frequency. That's generally not a big
problem on most drivers, however, starting with changeset
6fe1099c7aec, the frequency drift is taken into account at
dib7000p driver.

This broke support for PCTV 340e, with uses dib7000p demod and
xc4000 tuner.

Signed-off-by: Mauro Carvalho Chehab <m.chehab at samsung.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/media/tuners/xc4000.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/media/tuners/xc4000.c b/drivers/media/tuners/xc4000.c
index 2018bef..e71decb 100644
--- a/drivers/media/tuners/xc4000.c
+++ b/drivers/media/tuners/xc4000.c
@@ -93,7 +93,7 @@ struct xc4000_priv {
 	struct firmware_description *firm;
 	int	firm_size;
 	u32	if_khz;
-	u32	freq_hz;
+	u32	freq_hz, freq_offset;
 	u32	bandwidth;
 	u8	video_standard;
 	u8	rf_mode;
@@ -1157,14 +1157,14 @@ static int xc4000_set_params(struct dvb_frontend *fe)
 	case SYS_ATSC:
 		dprintk(1, "%s() VSB modulation\n", __func__);
 		priv->rf_mode = XC_RF_MODE_AIR;
-		priv->freq_hz = c->frequency - 1750000;
+		priv->freq_offset = 1750000;
 		priv->video_standard = XC4000_DTV6;
 		type = DTV6;
 		break;
 	case SYS_DVBC_ANNEX_B:
 		dprintk(1, "%s() QAM modulation\n", __func__);
 		priv->rf_mode = XC_RF_MODE_CABLE;
-		priv->freq_hz = c->frequency - 1750000;
+		priv->freq_offset = 1750000;
 		priv->video_standard = XC4000_DTV6;
 		type = DTV6;
 		break;
@@ -1173,23 +1173,23 @@ static int xc4000_set_params(struct dvb_frontend *fe)
 		dprintk(1, "%s() OFDM\n", __func__);
 		if (bw == 0) {
 			if (c->frequency < 400000000) {
-				priv->freq_hz = c->frequency - 2250000;
+				priv->freq_offset = 2250000;
 			} else {
-				priv->freq_hz = c->frequency - 2750000;
+				priv->freq_offset = 2750000;
 			}
 			priv->video_standard = XC4000_DTV7_8;
 			type = DTV78;
 		} else if (bw <= 6000000) {
 			priv->video_standard = XC4000_DTV6;
-			priv->freq_hz = c->frequency - 1750000;
+			priv->freq_offset = 1750000;
 			type = DTV6;
 		} else if (bw <= 7000000) {
 			priv->video_standard = XC4000_DTV7;
-			priv->freq_hz = c->frequency - 2250000;
+			priv->freq_offset = 2250000;
 			type = DTV7;
 		} else {
 			priv->video_standard = XC4000_DTV8;
-			priv->freq_hz = c->frequency - 2750000;
+			priv->freq_offset = 2750000;
 			type = DTV8;
 		}
 		priv->rf_mode = XC_RF_MODE_AIR;
@@ -1200,6 +1200,8 @@ static int xc4000_set_params(struct dvb_frontend *fe)
 		goto fail;
 	}

+	priv->freq_hz = c->frequency - priv->freq_offset;
+
 	dprintk(1, "%s() frequency=%d (compensated)\n",
 		__func__, priv->freq_hz);

@@ -1520,7 +1522,7 @@ static int xc4000_get_frequency(struct dvb_frontend *fe, u32 *freq)
 {
 	struct xc4000_priv *priv = fe->tuner_priv;

-	*freq = priv->freq_hz;
+	*freq = priv->freq_hz + priv->freq_offset;

 	if (debug) {
 		mutex_lock(&priv->lock);
--
1.9.1