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musb: use dma mode 1 for TX if transfer size equals maxpacket (v2)

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Currently, with Inventra DMA, we use Mode 0 if transfer size is less
than or equal to the endpoint's maxpacket size.  This requires that
we explicitly set TXPKTRDY for that transfer.

However the musb_g_tx code will not set TXPKTRDY twice if the last
transfer is exactly equal to maxpacket, even if request->zero is set.
Using Mode 1 will solve this; a better fix might be in musb_g_tx().

Without this change, musb will not correctly send out a ZLP if the
last transfer is the maxpacket size and request->zero is set.

Signed-off-by: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Anand Gadiyar 2009-04-02 12:07:08 -07:00 committed by Greg Kroah-Hartman
parent ab983f2a1b
commit d1043a2697
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/musb/musb_gadget.c
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@ -310,7 +310,7 @@ static void txstate(struct musb *musb, struct musb_request *req)
/* setup DMA, then program endpoint CSR */
request_size = min(request->length,
musb_ep->dma->max_len);
if (request_size <= musb_ep->packet_sz)
if (request_size < musb_ep->packet_sz)
musb_ep->dma->desired_mode = 0;
else
musb_ep->dma->desired_mode = 1;