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| author | Hans de Goede <hdegoede@redhat.com> | 2012-01-01 16:03:37 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-01-06 09:08:55 -0200 |
| commit | d80dd5d036147e00a27e3c649aec64bf9e572e9b (patch) | |
| tree | 46c68026a045d8be9978666991772a23241cb826 /drivers | |
| parent | eb3fb7c9633f79077c7c650efe0edec1840926da (diff) | |
| download | linux-d80dd5d036147e00a27e3c649aec64bf9e572e9b.tar.bz2 | |
[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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/video/gspca/sn9c20x.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/media/video/gspca/sn9c20x.c b/drivers/media/video/gspca/sn9c20x.c index 7350718c613a..b5fca9166745 100644 --- a/drivers/media/video/gspca/sn9c20x.c +++ b/drivers/media/video/gspca/sn9c20x.c @@ -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, |