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authorDevin Heitmueller <dheitmueller@kernellabs.com>2009-10-28 23:10:16 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-12-05 18:41:23 -0200
commit48c511ed675772bd08044d97756f7f7aae5168eb (patch)
tree19f91133199dfad5ab0174ff5d826c0404760328 /drivers/media/common
parentf0cd44b4a1a7465230dfbe1e645d9dc73f83cb13 (diff)
V4L/DVB (13331): mxl5005s: provide ability to override QAM gain for HVR-1600
The HVR-1600 doesn't use the standard mechanism for computing the gain when in QAM mode, instead always forcing it to be 0x02. Provide the ability to override the algorithm on a per-board basis. This change results in an improvement of 0.4-0.6 dB for QAM tuning. 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>
Diffstat (limited to 'drivers/media/common')
-rw-r--r--drivers/media/common/tuners/mxl5005s.c5
-rw-r--r--drivers/media/common/tuners/mxl5005s.h4
2 files changed, 8 insertions, 1 deletions
diff --git a/drivers/media/common/tuners/mxl5005s.c b/drivers/media/common/tuners/mxl5005s.c
index 0803dab58ff..605e28b7326 100644
--- a/drivers/media/common/tuners/mxl5005s.c
+++ b/drivers/media/common/tuners/mxl5005s.c
@@ -2789,7 +2789,10 @@ static u16 MXL_TuneRF(struct dvb_frontend *fe, u32 RF_Freq)
/* add for 2.6.5 Special setting for QAM */
if (state->Mod_Type == MXL_QAM) {
- if (state->RF_IN < 680000000)
+ if (state->config->qam_gain != 0)
+ status += MXL_ControlWrite(fe, RFSYN_CHP_GAIN,
+ state->config->qam_gain);
+ else if (state->RF_IN < 680000000)
status += MXL_ControlWrite(fe, RFSYN_CHP_GAIN, 3);
else
status += MXL_ControlWrite(fe, RFSYN_CHP_GAIN, 2);
diff --git a/drivers/media/common/tuners/mxl5005s.h b/drivers/media/common/tuners/mxl5005s.h
index 7ac6815b30a..fc8a1ffc53b 100644
--- a/drivers/media/common/tuners/mxl5005s.h
+++ b/drivers/media/common/tuners/mxl5005s.h
@@ -108,6 +108,10 @@ struct mxl5005s_config {
#define MXL_LOW_IF 1
u8 if_mode;
+ /* Some boards need to override the built-in logic for determining
+ the gain when in QAM mode (the HVR-1600 is one such case) */
+ u8 qam_gain;
+
/* Stuff I don't know what to do with */
u8 AgcMasterByte;
};