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[media] gscpa - sn9c20x: Add sd_isoc_init ensuring enough bw when i420 fmt 

When using the SN9C20X_I420 fmt the sn9c20x needs more bandwidth
than our regular bandwidth calculations reserve.

This patch adds a sd_isoc_init function, which forces the use of a specific
altsetting when using the SN9C20X_I420 fmt.

This fixes the bottom 10-30% of the image getting corrupted when using
the SN9C20X_I420 fmt (which is the default fmt).

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans de Goede 2012-01-01 16:03:37 -03:00 committed by Mauro Carvalho Chehab
parent eb3fb7c963
commit d80dd5d036
1 changed files with 37 additions and 0 deletions
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37
drivers/media/video/gspca/sn9c20x.c
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@ -2234,6 +2234,42 @@ static void configure_sensor_output(struct gspca_dev *gspca_dev, int mode)
}
}
static int sd_isoc_init(struct gspca_dev *gspca_dev)
{
struct usb_interface *intf;
u32 flags = gspca_dev->cam.cam_mode[(int)gspca_dev->curr_mode].priv;
/*
* When using the SN9C20X_I420 fmt the sn9c20x needs more bandwidth
* than our regular bandwidth calculations reserve, so we force the
* use of a specific altsetting when using the SN9C20X_I420 fmt.
*/
if (!(flags & (MODE_RAW | MODE_JPEG))) {
intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
if (intf->num_altsetting != 9) {
pr_warn("sn9c20x camera with unknown number of alt "
"settings (%d), please report!\n",
intf->num_altsetting);
gspca_dev->alt = intf->num_altsetting;
return 0;
}
switch (gspca_dev->width) {
case 160: /* 160x120 */
gspca_dev->alt = 2;
break;
case 320: /* 320x240 */
gspca_dev->alt = 6;
break;
default: /* >= 640x480 */
gspca_dev->alt = 9;
}
}
return 0;
}
#define HW_WIN(mode, hstart, vstart) \
((const u8 []){hstart, 0, vstart, 0, \
(mode & MODE_SXGA ? 1280 >> 4 : 640 >> 4), \
@ -2474,6 +2510,7 @@ static const struct sd_desc sd_desc = {
.nctrls = ARRAY_SIZE(sd_ctrls),
.config = sd_config,
.init = sd_init,
.isoc_init = sd_isoc_init,
.start = sd_start,
.stopN = sd_stopN,
.pkt_scan = sd_pkt_scan,