diff options
Diffstat (limited to 'recipes/linux/linux-omap-2.6.29/musb/0022-musb-use-dma-mode-1-for-TX-if-transfer-size-equals.patch')
| -rw-r--r-- | recipes/linux/linux-omap-2.6.29/musb/0022-musb-use-dma-mode-1-for-TX-if-transfer-size-equals.patch | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/recipes/linux/linux-omap-2.6.29/musb/0022-musb-use-dma-mode-1-for-TX-if-transfer-size-equals.patch b/recipes/linux/linux-omap-2.6.29/musb/0022-musb-use-dma-mode-1-for-TX-if-transfer-size-equals.patch new file mode 100644 index 0000000000..16b5b9908b --- /dev/null +++ b/recipes/linux/linux-omap-2.6.29/musb/0022-musb-use-dma-mode-1-for-TX-if-transfer-size-equals.patch @@ -0,0 +1,38 @@ +From ba59a0812ba0e223bd0af8f4dea6c971b6289696 Mon Sep 17 00:00:00 2001 +From: Anand Gadiyar <gadiyar-l0cyMroinI0@public.gmane.org> +Date: Thu, 2 Apr 2009 12:07:08 -0700 +Subject: [PATCH] musb: use dma mode 1 for TX if transfer size equals maxpacket (v2) + +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-l0cyMroinI0@public.gmane.org> +Signed-off-by: David Brownell <dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org> +--- + drivers/usb/musb/musb_gadget.c | 2 +- + 1 files changed, 1 insertions(+), 1 deletions(-) + +diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c +index bc197b2..e8f920c 100644 +--- a/drivers/usb/musb/musb_gadget.c ++++ b/drivers/usb/musb/musb_gadget.c +@@ -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; +-- +1.6.0.4 + |