V4L/DVB (11715): gspca - main: Set the number of packets per ISOC message.

The number of packets per isochronous message may now be set by the subdrivers
(default value 32).
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/gspca.c

@@ -513,9 +513,9 @@ static int create_urbs(struct gspca_dev *gspca_dev,
 
 		/* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
 		psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
-		npkt = ISO_MAX_SIZE / psize;
-		if (npkt > ISO_MAX_PKT)
-			npkt = ISO_MAX_PKT;
+		npkt = gspca_dev->cam.npkt;
+		if (npkt == 0)
+			npkt = 32;		/* default value */
 		bsize = psize * npkt;
 		PDEBUG(D_STREAM,
 			"isoc %d pkts size %d = bsize:%d",

drivers/media/video/gspca/gspca.h

@@ -44,8 +44,6 @@ extern int gspca_debug;
 #define GSPCA_MAX_FRAMES 16	/* maximum number of video frame buffers */
 /* image transfers */
 #define MAX_NURBS 4		/* max number of URBs */
-#define ISO_MAX_PKT 32		/* max number of packets in an ISOC transfer */
-#define ISO_MAX_SIZE 0x8000	/* max size of one URB buffer (32 Kb) */
 
 /* device information - set at probe time */
 struct cam {
@@ -57,6 +55,8 @@ struct cam {
 				 * - when 0 and bulk_size != 0 means
 				 *   1 URB and submit done by subdriver */
 	u8 bulk;		/* image transfer by 0:isoc / 1:bulk */
+	u8 npkt;		/* number of packets in an ISOC message
+				 * 0 is the default value: 32 packets */
 	u32 input_flags;	/* value for ENUM_INPUT status flags */
 };
 

drivers/media/video/gspca/sonixb.c

@@ -877,6 +877,8 @@ static int sd_config(struct gspca_dev *gspca_dev,
 		cam->cam_mode = sif_mode;
 		cam->nmodes = ARRAY_SIZE(sif_mode);
 	}
+	cam->npkt = 36;			/* 36 packets per ISOC message */
+
 	sd->brightness = BRIGHTNESS_DEF;
 	sd->gain = GAIN_DEF;
 	sd->exposure = EXPOSURE_DEF;

drivers/media/video/gspca/sonixj.c

@@ -1280,6 +1280,7 @@ static int sd_config(struct gspca_dev *gspca_dev,
 	cam = &gspca_dev->cam;
 	cam->cam_mode = vga_mode;
 	cam->nmodes = ARRAY_SIZE(vga_mode);
+	cam->npkt = 24;			/* 24 packets per ISOC message */
 
 	sd->bridge = id->driver_info >> 16;
 	sd->sensor = id->driver_info >> 8;

drivers/media/video/gspca/vc032x.c

@@ -42,7 +42,7 @@ struct sd {
 	char bridge;
 #define BRIDGE_VC0321 0
 #define BRIDGE_VC0323 1
-	char sensor;
+	u8 sensor;
 #define SENSOR_HV7131R 0
 #define SENSOR_MI0360 1
 #define SENSOR_MI1310_SOC 2
@@ -2453,6 +2453,17 @@ static int sd_config(struct gspca_dev *gspca_dev,
 	struct usb_device *dev = gspca_dev->dev;
 	struct cam *cam;
 	int sensor;
+	static u8 npkt[] = {	/* number of packets per ISOC message */
+		64,		/* HV7131R 0 */
+		32,		/* MI0360 1 */
+		32,		/* MI1310_SOC 2 */
+		64,		/* MI1320 3 */
+		128,		/* MI1320_SOC 4 */
+		32,		/* OV7660 5 */
+		64,		/* OV7670 6 */
+		128,		/* PO1200 7 */
+		128,		/* PO3130NC 8 */
+	};
 
 	cam = &gspca_dev->cam;
 	sd->bridge = id->driver_info;
@@ -2515,6 +2526,7 @@ static int sd_config(struct gspca_dev *gspca_dev,
 			break;
 		}
 	}
+	cam->npkt = npkt[sd->sensor];
 
 	sd->hflip = HFLIP_DEF;
 	sd->vflip = VFLIP_DEF;