The udc uses an shared dma memory space between hard and software. This
memory layout is described in ci13xxx_qh and ci13xxx_td which are marked
with the attribute ((packed)).
The compiler currently does not know about the alignment of the memory
layout, and will create strb and ldrb operations.
The Datasheet of the synopsys core describes, that some operations on
the mapped memory need to be atomic double word operations. I.e. the
next pointer addressing in the qhead, as otherwise the hardware could
read wrong data and totally stuck.
This patch adds the attribute ((aligned(4))) to the structures to tell
the compiler to use 32bit operations. It also adds an wmb() for the
prepared TD data before it gets enqueued into the qhead.
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
---
drivers/usb/chipidea/udc.c | 2 ++
drivers/usb/chipidea/udc.h | 4 ++--
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index f64fbea..77fb66f 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -461,6 +461,8 @@ static int _hardware_enqueue(struct ci13xxx_ep *mEp, struct ci13xxx_req *mReq)
mReq->ptr->page[i] =
(mReq->req.dma + i * CI13XXX_PAGE_SIZE) & ~TD_RESERVED_MASK;
+ wmb();
+
if (!list_empty(&mEp->qh.queue)) {
struct ci13xxx_req *mReqPrev;
int n = hw_ep_bit(mEp->num, mEp->dir);
diff --git a/drivers/usb/chipidea/udc.h b/drivers/usb/chipidea/udc.h
index 4ff2384d..d12e8b5 100644
--- a/drivers/usb/chipidea/udc.h
+++ b/drivers/usb/chipidea/udc.h
@@ -40,7 +40,7 @@ struct ci13xxx_td {
#define TD_CURR_OFFSET (0x0FFFUL << 0)
#define TD_FRAME_NUM (0x07FFUL << 0)
#define TD_RESERVED_MASK (0x0FFFUL << 0)
-} __attribute__ ((packed));
+} __attribute__ ((packed, aligned(4)));
/* DMA layout of queue heads */
struct ci13xxx_qh {
@@ -57,7 +57,7 @@ struct ci13xxx_qh {
/* 9 */
u32 RESERVED;
struct usb_ctrlrequest setup;
-} __attribute__ ((packed));
+} __attribute__ ((packed, aligned(4)));
/**
* struct ci13xxx_req - usb request representation
--
1.8.2.rc2
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
