V4L/DVB (9315): s5h1411: Skip reconfiguring demod modulation if already at the desired modulation

If we are already at the desired modulation, there is no need to reconfigure
the demod (at a tuning time cost)

Note that this change revealed that although the datasheet says the demod
starts out in VSB-8 mode, the first tuning was failing consistently unless
we went through the work of setting the registers.  So add a field to denote
this case so we always do the enable_frontend call, even if the first tuning
request is for VSB-8.

Signed-off-by: Devin Heitmueller <devin.heitmueller@gmail.com>
Reviewed-by: Michael Krufky <mkrufky@linuxtv.org>
Acked-by: Steven Toth <stoth@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/s5h1411.c b/drivers/media/dvb/frontends/s5h1411.c
index 40e0fedf381e..b9ac6d35a1eb 100644
--- a/drivers/media/dvb/frontends/s5h1411.c
+++ b/drivers/media/dvb/frontends/s5h1411.c
@@ -38,6 +38,7 @@ struct s5h1411_state {
         struct dvb_frontend frontend;
 
         fe_modulation_t current_modulation;
+        unsigned int first_tune:1;
 
         u32 current_frequency;
         int if_freq;
@@ -489,6 +490,12 @@ static int s5h1411_enable_modulation(struct dvb_frontend *fe,
 
         dprintk("%s(0x%08x)\n", __func__, m);
 
+        if ((state->first_tune == 0) && (m == state->current_modulation)) {
+                dprintk("%s() Already at desired modulation.  Skipping...\n",
+                        __func__);
+                return 0;
+        }
+
         switch (m) {
         case VSB_8:
                 dprintk("%s() VSB_8\n", __func__);
@@ -513,6 +520,7 @@ static int s5h1411_enable_modulation(struct dvb_frontend *fe,
         }
 
         state->current_modulation = m;
+        state->first_tune = 0;
         s5h1411_softreset(fe);
 
         return 0;
@@ -622,6 +630,11 @@ static int s5h1411_init(struct dvb_frontend *fe)
         /* The datasheet says that after initialisation, VSB is default */
         state->current_modulation = VSB_8;
 
+        /* Although the datasheet says it's in VSB, empirical evidence
+           shows problems getting lock on the first tuning request.  Make
+           sure we call enable_modulation the first time around */
+        state->first_tune = 1;
+
         if (state->config->output_mode == S5H1411_SERIAL_OUTPUT)
                 /* Serial */
                 s5h1411_set_serialmode(fe, 1);