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media: lgdt3306a: QAM streaming improvement

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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 <brad@nextdimension.cc>
Reviewed-by: Michael Ira Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Brad Love 2018-01-04 20:30:24 -05:00 committed by Mauro Carvalho Chehab
parent 5b3a8e9069
commit 4c7c3f9b1a
1 changed files with 22 additions and 0 deletions
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22
drivers/media/dvb-frontends/lgdt3306a.c
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@ -598,6 +598,28 @@ static int lgdt3306a_set_qam(struct lgdt3306a_state *state, int modulation)
if (lg_chkerr(ret)) if (lg_chkerr(ret))
goto fail; 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 */ /* 6. Reset */
ret = lgdt3306a_soft_reset(state); ret = lgdt3306a_soft_reset(state);
if (lg_chkerr(ret)) if (lg_chkerr(ret))