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[media] em28xx: add module parameter for selection of the preferred USB transfer type

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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@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Frank Schaefer 2012-11-08 14:11:53 -03:00 committed by Mauro Carvalho Chehab
parent c647a91a25
commit 454fe92f01
1 changed files with 9 additions and 2 deletions
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11
drivers/media/usb/em28xx/em28xx-cards.c
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@ -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;
@ -3332,9 +3337,11 @@ 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);