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Subject[PATCH v2 02/10] usb: musb: Add quirk to avoid skb reserve in gadget mode
Date
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>
---
drivers/usb/musb/musb_core.c | 3 +++
drivers/usb/musb/musb_core.h | 1 +
2 files changed, 4 insertions(+)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 870da18f5077..87cbd56cc761 100644
--- 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 3e98d4268a64..9f22c5b8ce37 100644
--- 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)
--
2.12.2
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