On Wed, Jul 05, 2017 at 08:19:51PM +0300, Dmitry Osipenko wrote: > NVIDIA Tegra20 UDC can't cope with unaligned DMA and require a USB gadget > quirk that avoids SKB buffer alignment to be set in order to make Ethernet > Gadget working. Later Tegra generations do not require that quirk. Let's > add a new platform data flag that allows to enable USB gadget quirk for > platforms that require it. > > Signed-off-by: Dmitry Osipenko <[email protected]> > --- > drivers/usb/chipidea/udc.c | 3 +++ > include/linux/usb/chipidea.h | 1 + > 2 files changed, 4 insertions(+) > > diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c > index d68b125796f9..404f10513339 100644 > --- a/drivers/usb/chipidea/udc.c > +++ b/drivers/usb/chipidea/udc.c > @@ -1899,6 +1899,9 @@ static int udc_start(struct ci_hdrc *ci) > ci->gadget.name = ci->platdata->name; > ci->gadget.otg_caps = otg_caps; > > + if (ci->platdata->flags & CI_HDRC_REQUIRES_ALIGNED_DMA) > + ci->gadget.quirk_avoids_skb_reserve = 1; > + > if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support || > otg_caps->adp_support)) > ci->gadget.is_otg = 1; > diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h > index c5fdfcf99828..d725cff7268d 100644 > --- a/include/linux/usb/chipidea.h > +++ b/include/linux/usb/chipidea.h > @@ -58,6 +58,7 @@ struct ci_hdrc_platform_data { > #define CI_HDRC_OVERRIDE_TX_BURST BIT(10) > #define CI_HDRC_OVERRIDE_RX_BURST BIT(11) > #define CI_HDRC_OVERRIDE_PHY_CONTROL BIT(12) /* Glue layer manages phy */ > +#define CI_HDRC_REQUIRES_ALIGNED_DMA BIT(13) > enum usb_dr_mode dr_mode; > #define CI_HDRC_CONTROLLER_RESET_EVENT 0 > #define CI_HDRC_CONTROLLER_STOPPED_EVENT 1
Acked-by: Peter Chen <[email protected]> -- Best Regards, Peter Chen -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
