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

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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>
This commit is contained in:
Peter Ujfalusi 2017-06-16 10:40:56 -05:00 committed by Greg Kroah-Hartman
parent 9816c09e2c
commit 1fa07c370b
2 changed files with 4 additions and 0 deletions
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3
drivers/usb/musb/musb_core.c
View File

@ -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;

1
drivers/usb/musb/musb_core.h
View File

@ -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)