From ab330cf3888d8e0779fa05a243d53ba9f53a7ba9 Mon Sep 17 00:00:00 2001 From: Yoshihiro Shimoda Date: Thu, 12 Mar 2015 15:35:20 +0900 Subject: usb: renesas_usbhs: add support for USB-DMAC Some Renesas SoCs have the USB-DMAC. It is able to terminate transfers when a short packet is received, even if less bytes than the transfer counter size have been received. Also, it is able to send a short packet even if the packet size is not multiples of 8bytes. Since the previous code has used the interruption of USBHS controller when receiving packets even if this driver has used a dmac, a lot of interruptions has happened. This patch will reduce such interruptions. This patch allows to use the USB-DMAC on R-Car H2 and M2. Signed-off-by: Yoshihiro Shimoda Signed-off-by: Felipe Balbi --- include/linux/usb/renesas_usbhs.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux/usb') diff --git a/include/linux/usb/renesas_usbhs.h b/include/linux/usb/renesas_usbhs.h index 9fd9e481ea98..f06529c14141 100644 --- a/include/linux/usb/renesas_usbhs.h +++ b/include/linux/usb/renesas_usbhs.h @@ -165,6 +165,8 @@ struct renesas_usbhs_driver_param { */ u32 has_otg:1; /* for controlling PWEN/EXTLP */ u32 has_sudmac:1; /* for SUDMAC */ + u32 has_usb_dmac:1; /* for USB-DMAC */ +#define USBHS_USB_DMAC_XFER_SIZE 32 /* hardcode the xfer size */ }; #define USBHS_TYPE_R8A7790 1 -- cgit v1.2.2