V4L/DVB (3693): Fix msp3400c and bttv stereo/mono/bilingual detection/handling

- msp3400c did not detect the second carrier, thus being always mono.
- properly mute the msp3400c while detecting the carrier.
- fix checks on the presence of scart2/3 inputs and scart 2 output.
- implement proper audio mode fallbacks for msp3400c/d, identical to the
  way msp3400g works.
- MODE_STEREO no longer produces dual languages when set for a bilingual
  transmission, instead it falls back to LANG1. Use LANG1_LANG2 to hear
  both languages of a bilingual transmission. This is much more intuitive
  for the user and is in accordance with the preferred usage in the v4l2
  specification.
- bttv tried to implement v4l2 calls with v4l1 calls to the i2c devices,
  completely mangling the audmode/rxsubchans handling. v4l2 calls now do
  v4l2 calls to the i2c devices.
- fixed broken i2c_vidiocschan in bttv.
- add start/end lines to LOG_STATUS.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 39 insertions, 32 deletions

diff --git a/drivers/media/video/msp3400-kthreads.c b/drivers/media/video/msp3400-kthreads.c
index 1a4564a7e92f..926095c6d826 100644
--- a/drivers/media/video/msp3400-kthreads.c
+++ b/drivers/media/video/msp3400-kthreads.c
@@ -170,7 +170,7 @@ static void msp_set_source(struct i2c_client *client, u16 src)
         msp_write_dsp(client, 0x000a, src);
         msp_write_dsp(client, 0x000b, src);
         msp_write_dsp(client, 0x000c, src);
-        if (state->has_scart23_in_scart2_out)
+        if (state->has_scart2_out)
                 msp_write_dsp(client, 0x0041, src);
 }
 
@@ -240,15 +240,22 @@ static void msp3400c_set_audmode(struct i2c_client *client)
                 return;
         }
 
-        /* If no second language is available, switch to the first language */
-        if ((audmode == V4L2_TUNER_MODE_LANG2 ||
-             audmode == V4L2_TUNER_MODE_LANG1_LANG2) &&
-            !(state->rxsubchans & V4L2_TUNER_SUB_LANG2))
-                audmode = V4L2_TUNER_MODE_LANG1;
-        /* switch to stereo for stereo transmission, otherwise
-           keep first language */
-        if (audmode == V4L2_TUNER_MODE_LANG1 &&
-            (state->rxsubchans & V4L2_TUNER_SUB_STEREO))
+        /* Note: for the C and D revs no NTSC stereo + SAP is possible as
+           the hardware does not support SAP. So the rxsubchans combination
+           of STEREO | LANG2 does not occur. */
+
+        /* switch to mono if only mono is available */
+        if (state->rxsubchans == V4L2_TUNER_SUB_MONO)
+                audmode = V4L2_TUNER_MODE_MONO;
+        /* if bilingual */
+        else if (state->rxsubchans & V4L2_TUNER_SUB_LANG2) {
+                /* and mono or stereo, then fallback to lang1 */
+                if (audmode == V4L2_TUNER_MODE_MONO ||
+                    audmode == V4L2_TUNER_MODE_STEREO)
+                        audmode = V4L2_TUNER_MODE_LANG1;
+        }
+        /* if stereo, and audmode is not mono, then switch to stereo */
+        else if (audmode != V4L2_TUNER_MODE_MONO)
                 audmode = V4L2_TUNER_MODE_STEREO;
 
         /* switch demodulator */
@@ -308,6 +315,7 @@ static void msp3400c_set_audmode(struct i2c_client *client)
         }
 
         /* switch audio */
+        v4l_dbg(1, msp_debug, client, "set audmode %d\n", audmode);
         switch (audmode) {
         case V4L2_TUNER_MODE_STEREO:
         case V4L2_TUNER_MODE_LANG1_LANG2:
@@ -476,8 +484,9 @@ int msp3400c_thread(void *data)
                         continue;
                 }
 
-                /* mute */
-                msp_set_mute(client);
+                /* put into sane state (and mute) */
+                msp_reset(client);
+
                 msp3400c_set_mode(client, MSP_MODE_AM_DETECT);
                 val1 = val2 = 0;
                 max1 = max2 = -1;
@@ -560,7 +569,6 @@ int msp3400c_thread(void *data)
                                 /* B/G NICAM */
                                 state->second = msp3400c_carrier_detect_55[max2].cdo;
                                 msp3400c_set_mode(client, MSP_MODE_FM_NICAM1);
-                                msp3400c_set_carrier(client, state->second, state->main);
                                 state->nicam_on = 1;
                                 state->watch_stereo = 1;
                         } else {
@@ -571,7 +579,6 @@ int msp3400c_thread(void *data)
                         /* PAL I NICAM */
                         state->second = MSP_CARRIER(6.552);
                         msp3400c_set_mode(client, MSP_MODE_FM_NICAM2);
-                        msp3400c_set_carrier(client, state->second, state->main);
                         state->nicam_on = 1;
                         state->watch_stereo = 1;
                         break;
@@ -585,13 +592,11 @@ int msp3400c_thread(void *data)
                                 /* L NICAM or AM-mono */
                                 state->second = msp3400c_carrier_detect_65[max2].cdo;
                                 msp3400c_set_mode(client, MSP_MODE_AM_NICAM);
-                                msp3400c_set_carrier(client, state->second, state->main);
                                 state->watch_stereo = 1;
                         } else if (max2 == 0 && state->has_nicam) {
                                 /* D/K NICAM */
                                 state->second = msp3400c_carrier_detect_65[max2].cdo;
                                 msp3400c_set_mode(client, MSP_MODE_FM_NICAM1);
-                                msp3400c_set_carrier(client, state->second, state->main);
                                 state->nicam_on = 1;
                                 state->watch_stereo = 1;
                         } else {
@@ -603,13 +608,15 @@ int msp3400c_thread(void *data)
                 no_second:
                         state->second = msp3400c_carrier_detect_main[max1].cdo;
                         msp3400c_set_mode(client, MSP_MODE_FM_TERRA);
-                        msp3400c_set_carrier(client, state->second, state->main);
                         state->rxsubchans = V4L2_TUNER_SUB_MONO;
                         break;
                 }
+                msp3400c_set_carrier(client, state->second, state->main);
 
-                /* unmute */
+                /* unmute, restore misc registers */
                 msp_set_audio(client);
+
+                msp_write_dsp(client, 0x13, state->acb);
                 msp3400c_set_audmode(client);
 
                 if (msp_debug)
@@ -617,12 +624,12 @@ int msp3400c_thread(void *data)
 
                 /* monitor tv audio mode, the first time don't wait
                    so long to get a quick stereo/bilingual result */
-                if (msp_sleep(state, 1000))
-                        goto restart;
+                count = 20;
                 while (state->watch_stereo) {
                         watch_stereo(client);
-                        if (msp_sleep(state, 5000))
+                        if (msp_sleep(state, count ? 200 : 5000))
                                 goto restart;
+                        if (count) count--;
                 }
         }
         v4l_dbg(1, msp_debug, client, "thread: exit\n");
@@ -634,7 +641,7 @@ int msp3410d_thread(void *data)
 {
         struct i2c_client *client = data;
         struct msp_state *state = i2c_get_clientdata(client);
-        int val, i, std;
+        int val, i, std, count;
 
         v4l_dbg(1, msp_debug, client, "msp3410 daemon started\n");
 
@@ -775,12 +782,12 @@ int msp3410d_thread(void *data)
 
                 /* monitor tv audio mode, the first time don't wait
                    so long to get a quick stereo/bilingual result */
-                if (msp_sleep(state, 1000))
-                        goto restart;
+                count = 20;
                 while (state->watch_stereo) {
                         watch_stereo(client);
-                        if (msp_sleep(state, 5000))
+                        if (msp_sleep(state, count ? 200 : 5000))
                                 goto restart;
+                        if (count) count--;
                 }
         }
         v4l_dbg(1, msp_debug, client, "thread: exit\n");
@@ -837,20 +844,20 @@ static void msp34xxg_set_source(struct i2c_client *client, u16 reg, int in)
                 source = 0; /* mono only */
                 matrix = 0x30;
                 break;
-        case V4L2_TUNER_MODE_LANG1:
-                source = 3; /* stereo or A */
-                matrix = 0x00;
-                break;
         case V4L2_TUNER_MODE_LANG2:
                 source = 4; /* stereo or B */
                 matrix = 0x10;
                 break;
-        case V4L2_TUNER_MODE_STEREO:
         case V4L2_TUNER_MODE_LANG1_LANG2:
-        default:
                 source = 1; /* stereo or A|B */
                 matrix = 0x20;
                 break;
+        case V4L2_TUNER_MODE_STEREO:
+        case V4L2_TUNER_MODE_LANG1:
+        default:
+                source = 3; /* stereo or A */
+                matrix = 0x00;
+                break;
         }
 
         if (in == MSP_DSP_OUT_TUNER)
@@ -877,7 +884,7 @@ static void msp34xxg_set_sources(struct i2c_client *client)
         msp34xxg_set_source(client, 0x000c, (in >> 4) & 0xf);
         msp34xxg_set_source(client, 0x0009, (in >> 8) & 0xf);
         msp34xxg_set_source(client, 0x000a, (in >> 12) & 0xf);
-        if (state->has_scart23_in_scart2_out)
+        if (state->has_scart2_out)
                 msp34xxg_set_source(client, 0x0041, (in >> 16) & 0xf);
         msp34xxg_set_source(client, 0x000b, (in >> 20) & 0xf);
 }