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usb: chipidea: udc: Support SKB alignment quirk 

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@gmail.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
This commit is contained in:
Dmitry Osipenko 2017-08-16 13:32:39 +03:00 committed by Peter Chen
parent 7c3a8b8150
commit 581821ae7f
2 changed files with 4 additions and 0 deletions
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3
drivers/usb/chipidea/udc.c
View File

@ -1896,6 +1896,9 @@ 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;

1
include/linux/usb/chipidea.h
View File

@ -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