V4L/DVB (6821): s5h1409: fix IF frequency configuration

On the s5h1409 demod, the IF frequency for VSB is limited to 44 / 5.38 MHz.

Hardcode VSB IF frequency within the driver to 44 / 5.38 MHz.
QAM IF frequency remains configurable via attach-time configuration.

Acked-by: Steven Toth <stoth@hauppauge.com>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

2 files changed, 15 insertions, 3 deletions

diff --git a/drivers/media/dvb/frontends/s5h1409.c b/drivers/media/dvb/frontends/s5h1409.c
index 562d9208857a..b80a3ee91ba4 100644
--- a/drivers/media/dvb/frontends/s5h1409.c
+++ b/drivers/media/dvb/frontends/s5h1409.c
@@ -42,6 +42,7 @@ struct s5h1409_state {
         fe_modulation_t current_modulation;
 
         u32 current_frequency;
+        int if_freq;
 
         u32 is_qam_locked;
         u32 qam_state;
@@ -348,6 +349,9 @@ static int s5h1409_softreset(struct dvb_frontend* fe)
         return 0;
 }
 
+#define S5H1409_VSB_IF_FREQ 5380
+#define S5H1409_QAM_IF_FREQ state->config->qam_if
+
 static int s5h1409_set_if_freq(struct dvb_frontend* fe, int KHz)
 {
         struct s5h1409_state* state = fe->demodulator_priv;
@@ -369,6 +373,9 @@ static int s5h1409_set_if_freq(struct dvb_frontend* fe, int KHz)
                 ret = -1;
         }
 
+        if (0 == ret)
+                state->if_freq = KHz;
+
         return ret;
 }
 
@@ -394,11 +401,15 @@ static int s5h1409_enable_modulation(struct dvb_frontend* fe,
         switch(m) {
         case VSB_8:
                 dprintk("%s() VSB_8\n", __FUNCTION__);
+                if (state->if_freq != S5H1409_VSB_IF_FREQ)
+                        s5h1409_set_if_freq(fe, S5H1409_VSB_IF_FREQ);
                 s5h1409_writereg(state, 0xf4, 0);
                 break;
         case QAM_64:
         case QAM_256:
                 dprintk("%s() QAM_AUTO (64/256)\n", __FUNCTION__);
+                if (state->if_freq != S5H1409_QAM_IF_FREQ)
+                        s5h1409_set_if_freq(fe, S5H1409_QAM_IF_FREQ);
                 s5h1409_writereg(state, 0xf4, 1);
                 s5h1409_writereg(state, 0x85, 0x110);
                 break;
@@ -571,7 +582,7 @@ static int s5h1409_init (struct dvb_frontend* fe)
                 s5h1409_writereg(state, 0xab, 0x0); /* Parallel */
 
         s5h1409_set_spectralinversion(fe, state->config->inversion);
-        s5h1409_set_if_freq(fe, state->config->if_freq);
+        s5h1409_set_if_freq(fe, state->if_freq);
         s5h1409_set_gpio(fe, state->config->gpio);
         s5h1409_softreset(fe);
 
@@ -751,6 +762,7 @@ struct dvb_frontend* s5h1409_attach(const struct s5h1409_config* config,
         state->config = config;
         state->i2c = i2c;
         state->current_modulation = 0;
+        state->if_freq = S5H1409_VSB_IF_FREQ;
 
         /* check if the demod exists */
         if (s5h1409_readreg(state, 0x04) != 0x0066)
diff --git a/drivers/media/dvb/frontends/s5h1409.h b/drivers/media/dvb/frontends/s5h1409.h
index 20f9af1af445..b1f433906664 100644
--- a/drivers/media/dvb/frontends/s5h1409.h
+++ b/drivers/media/dvb/frontends/s5h1409.h
@@ -39,8 +39,8 @@ struct s5h1409_config
 #define S5H1409_GPIO_ON  1
         u8 gpio;
 
-        /* IF Freq in KHz */
-        u16 if_freq;
+        /* IF Freq for QAM in KHz, VSB is hardcoded to 5380 */
+        u16 qam_if;
 
         /* Spectral Inversion */
 #define S5H1409_INVERSION_OFF 0