diff options
| author | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-10-03 19:01:22 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-10-08 15:00:17 +0400 |
| commit | b728666ba5244505a80d1e395194e4b90386d504 (patch) | |
| tree | aa39fba5e24c94834df5b0135b3228e32814ce68 | |
| parent | 2f4cf2c3a971c4d5154def8ef9ce4811d702852d (diff) | |
| download | linux-b728666ba5244505a80d1e395194e4b90386d504.tar.xz | |
[media] saa7115: Fix standards detection
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.
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
| -rw-r--r-- | drivers/media/video/saa7115.c | 45 |
1 files changed, 31 insertions, 14 deletions
diff --git a/drivers/media/video/saa7115.c b/drivers/media/video/saa7115.c index cee98ea0eca7..86627a8fdbfb 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; } |