tree 9d369ee3d09001d11c497c2184337fb7a6ea239f
parent c589ebfce79834a9617c44d7ec0f608fa70eb42d
author Patrick Boettcher <[EMAIL PROTECTED]> Sat, 10 Sep 2005 03:02:38 -0700
committer Linus Torvalds <[EMAIL PROTECTED]> Sat, 10 Sep 2005 03:57:39 -0700

[PATCH] dvb: frontend: stv0297: QAM128 tuning improvement

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 <[EMAIL PROTECTED]>
Signed-off-by: Michael Krufky <[EMAIL PROTECTED]>
Signed-off-by: Johannes Stezenbach <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>

 drivers/media/dvb/frontends/stv0297.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/media/dvb/frontends/stv0297.c 
--- a/drivers/media/dvb/frontends/stv0297.c
+++ b/drivers/media/dvb/frontends/stv0297.c
@@ -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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