There are several bugs at saa7115 standards detection:
After the fix, the driver is returning the proper standards,
as tested with 3 different broadcast sources:
On an invalid channel (without any TV signal):
[ 4394.931630] saa7115 15-0021: Status byte 2 (0x1f)=0xe0
[ 4394.931635] saa7115 15-0021: detected std mask = 00ffffff
With a PAL/M signal:
[ 4410.836855] saa7115 15-0021: Status byte 2 (0x1f)=0xb1
[ 4410.837727] saa7115 15-0021: Status byte 1 (0x1e)=0x82
[ 4410.837731] saa7115 15-0021: detected std mask = 00000900
With a NTSC/M signal:
[ 4422.383893] saa7115 15-0021: Status byte 2 (0x1f)=0xb1
[ 4422.384768] saa7115 15-0021: Status byte 1 (0x1e)=0x81
[ 4422.384772] saa7115 15-0021: detected std mask = 0000b000
Tests were done with a WinTV PVR USB2 Model 29xx card.
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
---
drivers/media/video/saa7115.c | 47 +++++++++++++++++++++++++++-------------
1 files changed, 32 insertions(+), 15 deletions(-)
diff --git a/drivers/media/video/saa7115.c b/drivers/media/video/saa7115.c
index cee98ea..86627a8 100644
--- a/drivers/media/video/saa7115.c
+++ b/drivers/media/video/saa7115.c
@@ -1344,35 +1344,52 @@ static int saa711x_g_vbi_data(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_dat
static int saa711x_querystd(struct v4l2_subdev *sd, v4l2_std_id *std)
{
struct saa711x_state *state = to_state(sd);
- int reg1e;
+ int reg1f, reg1e;
- *std = V4L2_STD_ALL;
- if (state->ident != V4L2_IDENT_SAA7115) {
- int reg1f = saa711x_read(sd, R_1F_STATUS_BYTE_2_VD_DEC);
-
- if (reg1f & 0x20)
- *std = V4L2_STD_525_60;
- else
- *std = V4L2_STD_625_50;
-
- return 0;
+ reg1f = saa711x_read(sd, R_1F_STATUS_BYTE_2_VD_DEC);
+ v4l2_dbg(1, debug, sd, "Status byte 2 (0x1f)=0x%02x\n", reg1f);
+ if (reg1f & 0x40) {
+ /* horizontal/vertical not locked */
+ *std = V4L2_STD_ALL;
+ goto ret;
}
+ if (reg1f & 0x20)
+ *std = V4L2_STD_525_60;
+ else
+ *std = V4L2_STD_625_50;
+
+ if (state->ident != V4L2_IDENT_SAA7115)
+ goto ret;
reg1e = saa711x_read(sd, R_1E_STATUS_BYTE_1_VD_DEC);
switch (reg1e & 0x03) {
case 1:
- *std = V4L2_STD_NTSC;
+ *std &= V4L2_STD_NTSC;
break;
case 2:
- *std = V4L2_STD_PAL;
+ /*
+ * V4L2_STD_PAL just cover the european PAL standards.
+ * This is wrong, as the device could also be using an
+ * other PAL standard.
+ */
+ *std &= V4L2_STD_PAL | V4L2_STD_PAL_N | V4L2_STD_PAL_Nc |
+ V4L2_STD_PAL_M | V4L2_STD_PAL_60;
break;
case 3:
- *std = V4L2_STD_SECAM;
+ *std &= V4L2_STD_SECAM;
break;
default:
+ /* Can't detect anything */
+ *std = V4L2_STD_ALL;
break;
}
+
+ v4l2_dbg(1, debug, sd, "Status byte 1 (0x1e)=0x%02x\n", reg1e);
+
+ret:
+ v4l2_dbg(1, debug, sd, "detected std mask = %08Lx\n", *std);
+
return 0;
}
--
1.7.6.4
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