diff options
| -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, |