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Subject: media: lgdt3306a: QAM streaming improvement
Author: Brad Love <b...@nextdimension.cc>
Date: Thu Jan 4 20:30:24 2018 -0500
Add some register updates required for stable viewing
on Cablevision in NY. Does not adversely affect other providers.
Changes since v1:
- Change upper case hex to lower case.
Signed-off-by: Brad Love <b...@nextdimension.cc>
Reviewed-by: Michael Ira Krufky <mkru...@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
drivers/media/dvb-frontends/lgdt3306a.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
---
diff --git a/drivers/media/dvb-frontends/lgdt3306a.c
b/drivers/media/dvb-frontends/lgdt3306a.c
index d2477edae197..377271decbab 100644
--- a/drivers/media/dvb-frontends/lgdt3306a.c
+++ b/drivers/media/dvb-frontends/lgdt3306a.c
@@ -598,6 +598,28 @@ static int lgdt3306a_set_qam(struct lgdt3306a_state
*state, int modulation)
if (lg_chkerr(ret))
goto fail;
+ /* 5.1 V0.36 SRDCHKALWAYS : For better QAM detection */
+ ret = lgdt3306a_read_reg(state, 0x000a, &val);
+ val &= 0xfd;
+ val |= 0x02;
+ ret = lgdt3306a_write_reg(state, 0x000a, val);
+ if (lg_chkerr(ret))
+ goto fail;
+
+ /* 5.2 V0.36 Control of "no signal" detector function */
+ ret = lgdt3306a_read_reg(state, 0x2849, &val);
+ val &= 0xdf;
+ ret = lgdt3306a_write_reg(state, 0x2849, val);
+ if (lg_chkerr(ret))
+ goto fail;
+
+ /* 5.3 Fix for Blonder Tongue HDE-2H-QAM and AQM modulators */
+ ret = lgdt3306a_read_reg(state, 0x302b, &val);
+ val &= 0x7f; /* SELFSYNCFINDEN_CQS=0; disable auto reset */
+ ret = lgdt3306a_write_reg(state, 0x302b, val);
+ if (lg_chkerr(ret))
+ goto fail;
+
/* 6. Reset */
ret = lgdt3306a_soft_reset(state);
if (lg_chkerr(ret))
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