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

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>
hifive-unleashed-5.1
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);