| Date | Mon, 05 Sep 2005 01:23:20 +0200 | From | Johannes Stezenbach <> | Subject | [DVB patch 21/54] frontend: stv0297: QAM128 tuning improvement |
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From: Patrick Boettcher <pb@linuxtv.org>
while investigating the QAM_128-issue with the stv0297-driver for the Cablestar (which is not the same as the one in dvb-kernel CVS, yet), I fixed it, not by increasing the timeout, but by disabling the corner-detection for QAM_128 and higher.
This patch has been tested on dvb-kernel cvs, and has been reported to work by multiple users. Some cards still need timeout increase on top of this patch. This will be addressed later.
Signed-off-by: Patrick Boettcher <pb@linuxtv.org> Signed-off-by: Michael Krufky <mkrufky@m1k.net> Signed-off-by: Johannes Stezenbach <js@linuxtv.org>
drivers/media/dvb/frontends/stv0297.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
--- linux-2.6.13-git4.orig/drivers/media/dvb/frontends/stv0297.c 2005-09-04 22:24:24.000000000 +0200 +++ linux-2.6.13-git4/drivers/media/dvb/frontends/stv0297.c 2005-09-04 22:28:12.000000000 +0200 @@ -606,7 +606,13 @@ static int stv0297_set_frontend(struct d stv0297_set_inversion(state, inversion); /* kick off lock */ - stv0297_writereg_mask(state, 0x88, 0x08, 0x08); + /* Disable corner detection for higher QAMs */ + if (p->u.qam.modulation == QAM_128 || + p->u.qam.modulation == QAM_256) + stv0297_writereg_mask(state, 0x88, 0x08, 0x00); + else + stv0297_writereg_mask(state, 0x88, 0x08, 0x08); + stv0297_writereg_mask(state, 0x5a, 0x20, 0x00); stv0297_writereg_mask(state, 0x6a, 0x01, 0x01); stv0297_writereg_mask(state, 0x43, 0x40, 0x40); --
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