From 454fe92f01f8d669669619a9b301d133eda9d173 Mon Sep 17 00:00:00 2001 From: Frank Schaefer Date: Thu, 8 Nov 2012 14:11:53 -0300 Subject: [PATCH] [media] em28xx: add module parameter for selection of the preferred USB transfer type MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/em28xx/em28xx-cards.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/media/usb/em28xx/em28xx-cards.c b/drivers/media/usb/em28xx/em28xx-cards.c index a6f00181c246..bc63b1cee808 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; @@ -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); -- 2.20.1