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path: root/drivers/media/video/gspca/sn9c20x.c
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Diffstat (limited to 'drivers/media/video/gspca/sn9c20x.c')
-rw-r--r--drivers/media/video/gspca/sn9c20x.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/media/video/gspca/sn9c20x.c b/drivers/media/video/gspca/sn9c20x.c
index 33cabc342dc..9e198b45c3c 100644
--- a/drivers/media/video/gspca/sn9c20x.c
+++ b/drivers/media/video/gspca/sn9c20x.c
@@ -2048,6 +2048,7 @@ static int sd_config(struct gspca_dev *gspca_dev,
struct cam *cam;
cam = &gspca_dev->cam;
+ cam->needs_full_bandwidth = 1;
sd->sensor = (id->driver_info >> 8) & 0xff;
sd->i2c_addr = id->driver_info & 0xff;
@@ -2233,6 +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), \
@@ -2473,6 +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,