For Inventra dma, dma is configured for rx transfers after receiving first
packet (MUSB_RXCSR_RXPKTRDY set in RXCSR). DMA is configured based on the
requested length or the maximum length dma can handle. However, if the
received packet is less than the maximum packet size, length of this packet
should be used to configure the dma. As it will be the only packet to transfer
for this request.
Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@xxxxxxxxxxxxxx>
---
drivers/usb/musb/musb_gadget.c | 8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 419ca3e..ba5d5bd 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -731,7 +731,13 @@ static void rxstate(struct musb *musb, struct musb_request *req)
if (request->actual < request->length) {
int transfer_size = 0;
#ifdef USE_MODE1
- transfer_size = min(request->length - request->actual,
+ /* In case first packet is short */
+ if (len < musb_ep->packet_sz)
+ transfer_size = len;
+ else
+ transfer_size =
+ min(request->length -
+ request->actual,
channel->max_len);
#else
transfer_size = min(request->length - request->actual,
--
1.7.4.1
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