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V4L/DVB (4377): Force horizontal resolution limits in the pvrusb2 driver

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This change causes the pvrusb2 driver to limit horizontal resolution
to be only 720 if 24xxx device hardware is being used.  This is a
workaround for an unsolved problem in the driver where if the
resolution is set to something other than 720 the video quality will
be _seriously_ degraded.  It only happens on 24xxx devices (29xxx are
unaffected by the problem and unaffected by this change).  Once the
problem is finally solved, this small change can be removed.

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Mike Isely 2006-08-08 09:10:07 -03:00 committed by Mauro Carvalho Chehab
parent 89ebd63fdd
commit 094ddbe950
1 changed files with 30 additions and 0 deletions
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30
drivers/media/video/pvrusb2/pvrusb2-hdw.c
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@ -363,6 +363,30 @@ static int ctrl_freq_set(struct pvr2_ctrl *cptr,int m,int v)
return 0;
}
#ifdef CONFIG_VIDEO_PVRUSB2_24XXX
static int ctrl_hres_max_get(struct pvr2_ctrl *cptr,int *vp)
{
/* If we're dealing with a 24xxx device, force the horizontal
maximum to be 720 no matter what, since we can't get the device
to work properly with any other value. Otherwise just return
the normal value. */
*vp = cptr->info->def.type_int.max_value;
if (cptr->hdw->hdw_type == PVR2_HDW_TYPE_24XXX) *vp = 720;
return 0;
}
static int ctrl_hres_min_get(struct pvr2_ctrl *cptr,int *vp)
{
/* If we're dealing with a 24xxx device, force the horizontal
minimum to be 720 no matter what, since we can't get the device
to work properly with any other value. Otherwise just return
the normal value. */
*vp = cptr->info->def.type_int.min_value;
if (cptr->hdw->hdw_type == PVR2_HDW_TYPE_24XXX) *vp = 720;
return 0;
}
#endif
static int ctrl_cx2341x_is_dirty(struct pvr2_ctrl *cptr)
{
return cptr->hdw->enc_stale != 0;
@ -721,6 +745,12 @@ static const struct pvr2_ctl_info control_defs[] = {
.default_value = 720,
DEFREF(res_hor),
DEFINT(320,720),
#ifdef CONFIG_VIDEO_PVRUSB2_24XXX
/* Hook in check for clamp on horizontal resolution in
order to avoid unsolved problem involving cx25840. */
.get_max_value = ctrl_hres_max_get,
.get_min_value = ctrl_hres_min_get,
#endif
},{
.desc = "Vertical capture resolution",
.name = "resolution_ver",