usb: musb: Add quirk to avoid skb reserve in gadget mode

For tusb6010 the DMA functionality only possible if the buffer is 32bit
aligned (SYNC access to FIFO) since with ASYNC access the TX/RX offset
registers will corrupt eventually.
The MUSB_G_NO_SKB_RESERVE will set the quirk_avoids_skb_reserve flag in
usb_gadget struct to provide correctly aligned buffer.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 870da18..87cbd56 100644 (file)
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -2224,6 +2224,9 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
                musb->io.ep_select = musb_flat_ep_select;
        }
 
+       if (musb->io.quirks & MUSB_G_NO_SKB_RESERVE)
+               musb->g.quirk_avoids_skb_reserve = 1;
+
        /* At least tusb6010 has its own offsets */
        if (musb->ops->ep_offset)
                musb->io.ep_offset = musb->ops->ep_offset;

diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
index 3e98d42..9f22c5b 100644 (file)
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -172,6 +172,7 @@ struct musb_io;
  */
 struct musb_platform_ops {
 
+#define MUSB_G_NO_SKB_RESERVE  BIT(9)
 #define MUSB_DA8XX             BIT(8)
 #define MUSB_PRESERVE_SESSION  BIT(7)
 #define MUSB_DMA_UX500         BIT(6)