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 <digetx@xxxxxxxxx>
> ---
> 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 <peter.chen@xxxxxxx>
--
Best Regards,
Peter Chen
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
