This is a note to let you know that I've just added the patch titled
usb: musb: set TXMAXP and AUTOSET for full speed bulk in device mode
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-musb-set-txmaxp-and-autoset-for-full-speed-bulk-in-device-mode.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From bb3a2ef2eb8cfaea335dcb3426350df7f3d48069 Mon Sep 17 00:00:00 2001
From: supriya karanth <supriya.karanth@xxxxxxxxxxxxxx>
Date: Thu, 6 Dec 2012 11:12:48 +0530
Subject: usb: musb: set TXMAXP and AUTOSET for full speed bulk in device mode
From: supriya karanth <supriya.karanth@xxxxxxxxxxxxxx>
commit bb3a2ef2eb8cfaea335dcb3426350df7f3d48069 upstream.
The TXMAXP register is not set correctly for full speed bulk case
when the can_bulk_split() is used. Without this PIO transfers will
not take place correctly
The "mult" factor needs to be updated correctly for the
can_bulk_split() case
The AUTOSET bit in the TXCSR is not being set if the "mult"
factor is greater than 0 for the High Bandwidth ISO case.
But the "mult" factor is also greater than 0 in case of Full speed
bulk transfers with the packet splitting in TXMAXP register
Without the AUTOSET the DMA transfers will not progress in mode1
[ balbi@xxxxxx : add braces to both branches ]
Signed-off-by: supriya karanth <supriya.karanth@xxxxxxxxxxxxxx>
Signed-off-by: Praveena NADAHALLY <praveen.nadahally@xxxxxxxxxxxxxx>
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
Cc: ian coolidge <iancoolidge@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/musb/musb_gadget.c | 22 +++++++++++++++++++---
1 file changed, 19 insertions(+), 3 deletions(-)
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -401,7 +401,19 @@ static void txstate(struct musb *musb, s
csr |= (MUSB_TXCSR_DMAENAB
| MUSB_TXCSR_DMAMODE
| MUSB_TXCSR_MODE);
- if (!musb_ep->hb_mult)
+ /*
+ * Enable Autoset according to table
+ * below
+ * bulk_split hb_mult Autoset_Enable
+ * 0 0 Yes(Normal)
+ * 0 >0 No(High BW ISO)
+ * 1 0 Yes(HS bulk)
+ * 1 >0 Yes(FS bulk)
+ */
+ if (!musb_ep->hb_mult ||
+ (musb_ep->hb_mult &&
+ can_bulk_split(musb,
+ musb_ep->type)))
csr |= MUSB_TXCSR_AUTOSET;
}
csr &= ~MUSB_TXCSR_P_UNDERRUN;
@@ -1100,11 +1112,15 @@ static int musb_gadget_enable(struct usb
/* Set TXMAXP with the FIFO size of the endpoint
* to disable double buffering mode.
*/
- if (musb->double_buffer_not_ok)
+ if (musb->double_buffer_not_ok) {
musb_writew(regs, MUSB_TXMAXP, hw_ep->max_packet_sz_tx);
- else
+ } else {
+ if (can_bulk_split(musb, musb_ep->type))
+ musb_ep->hb_mult = (hw_ep->max_packet_sz_tx /
+ musb_ep->packet_sz) - 1;
musb_writew(regs, MUSB_TXMAXP, musb_ep->packet_sz
| (musb_ep->hb_mult << 11));
+ }
csr = MUSB_TXCSR_MODE | MUSB_TXCSR_CLRDATATOG;
if (musb_readw(regs, MUSB_TXCSR)
Patches currently in stable-queue which might be from supriya.karanth@xxxxxxxxxxxxxx are
queue-3.4/usb-musb-set-txmaxp-and-autoset-for-full-speed-bulk-in-device-mode.patch
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