By default, isoc transfers are used if possible.
With the new module parameter, bulk can be selected as the
preferred USB transfer type.
Signed-off-by: Frank Schäfer <fschaefer.oss@xxxxxxxxxxxxxx>
---
drivers/media/usb/em28xx/em28xx-cards.c | 11 +++++++++--
1 Datei geändert, 9 Zeilen hinzugefügt(+), 2 Zeilen entfernt(-)
diff --git a/drivers/media/usb/em28xx/em28xx-cards.c b/drivers/media/usb/em28xx/em28xx-cards.c
index a9344f0..7f5b303 100644
--- a/drivers/media/usb/em28xx/em28xx-cards.c
+++ b/drivers/media/usb/em28xx/em28xx-cards.c
@@ -61,6 +61,11 @@ static unsigned int card[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
module_param_array(card, int, NULL, 0444);
MODULE_PARM_DESC(card, "card type");
+static unsigned int prefer_bulk;
+module_param(prefer_bulk, int, 0644);
+MODULE_PARM_DESC(prefer_bulk, "prefer USB bulk transfers");
+
+
/* Bitmask marking allocated devices from 0 to EM28XX_MAXBOARDS - 1 */
static unsigned long em28xx_devused;
@@ -3334,9 +3339,11 @@ static int em28xx_usb_probe(struct usb_interface *interface,
}
/* Select USB transfer types to use */
- if (has_video && !dev->analog_ep_isoc)
+ if (has_video &&
+ (!dev->analog_ep_isoc || (prefer_bulk && dev->analog_ep_bulk)))
dev->analog_xfer_bulk = 1;
- if (has_dvb && !dev->dvb_ep_isoc)
+ if (has_dvb &&
+ (!dev->dvb_ep_isoc || (prefer_bulk && dev->dvb_ep_bulk)))
dev->dvb_xfer_bulk = 1;
snprintf(dev->name, sizeof(dev->name), "em28xx #%d", nr);
--
1.7.10.4
--
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