V4L/DVB (13329): s5h1409: provide HVR-1600 specific optimizations

Perform some optimization of the register configuration based on a trace
of the HVR-1600 Windows i2c traffic (and consultation with Steven Toth).
Note that some of these values may be able to be moved into the common driver,
but I am holding off on that until they can be tested with other boards.

This work was sponsored by ONELAN Limited.

Cc: Steven Toth <stoth@kernellabs.com>
Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 22 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/s5h1409.c b/drivers/media/dvb/frontends/s5h1409.c
index fb3011518427..85fba581c5ab 100644
--- a/drivers/media/dvb/frontends/s5h1409.c
+++ b/drivers/media/dvb/frontends/s5h1409.c
@@ -614,6 +614,21 @@ static int s5h1409_init(struct dvb_frontend *fe)
         /* The datasheet says that after initialisation, VSB is default */
         state->current_modulation = VSB_8;
 
+        /* Optimize for the HVR-1600 if appropriate.  Note that some of these
+           may get folded into the generic case after testing with other
+           devices */
+        if (state->config->hvr1600_opt == S5H1409_HVR1600_OPTIMIZE) {
+                /* VSB AGC REF */
+                s5h1409_writereg(state, 0x09, 0x0050);
+
+                /* Unknown but Windows driver does it... */
+                s5h1409_writereg(state, 0x21, 0x0001);
+                s5h1409_writereg(state, 0x50, 0x030e);
+
+                /* QAM AGC REF */
+                s5h1409_writereg(state, 0x82, 0x0800);
+        }
+
         if (state->config->output_mode == S5H1409_SERIAL_OUTPUT)
                 s5h1409_writereg(state, 0xab,
                         s5h1409_readreg(state, 0xab) | 0x100); /* Serial */
diff --git a/drivers/media/dvb/frontends/s5h1409.h b/drivers/media/dvb/frontends/s5h1409.h
index 070d9743e330..91f2ebd1a534 100644
--- a/drivers/media/dvb/frontends/s5h1409.h
+++ b/drivers/media/dvb/frontends/s5h1409.h
@@ -57,6 +57,13 @@ struct s5h1409_config {
 #define S5H1409_MPEGTIMING_NONCONTINOUS_INVERTING_CLOCK    2
 #define S5H1409_MPEGTIMING_NONCONTINOUS_NONINVERTING_CLOCK 3
         u16 mpeg_timing;
+
+        /* HVR-1600 optimizations (to better work with MXL5005s)
+           Note: some of these are likely to be folded into the generic driver
+           after being regression tested with other boards */
+#define S5H1409_HVR1600_NOOPTIMIZE 0
+#define S5H1409_HVR1600_OPTIMIZE   1
+        u8 hvr1600_opt;
 };
 
 #if defined(CONFIG_DVB_S5H1409) || (defined(CONFIG_DVB_S5H1409_MODULE) \