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https://git.yoctoproject.org/meta-ti
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Koen Kooi
536748db58
The complete patchset will get rebased to the tip of the PSP tree soon, but the conflicts take a lot of time to resolve. Signed-off-by: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Denys Dmytriyenko <denys@ti.com>
47 lines
1.6 KiB
Diff
47 lines
1.6 KiB
Diff
From 4fbf77cebc6d141b9a74a92fd2b3f756908ef657 Mon Sep 17 00:00:00 2001
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From: Ajay Kumar Gupta <ajay.gupta@ti.com>
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Date: Wed, 18 Apr 2012 00:16:03 +0530
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Subject: [PATCH 13/18] usb: musb: cppi41: fix zero byte OUT issue
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Fixes ZERO byte transfer in tx direction which was not being done in DMA mode.
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Used PIO mode for all zero byte tx transfer.
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---
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drivers/usb/musb/musb_host.c | 12 +++++++++++-
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1 files changed, 11 insertions(+), 1 deletions(-)
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diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
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index 7545a65..8981586 100644
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--- a/drivers/usb/musb/musb_host.c
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+++ b/drivers/usb/musb/musb_host.c
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@@ -761,6 +761,8 @@ static void musb_ep_program(struct musb *musb, u8 epnum,
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void __iomem *epio = hw_ep->regs;
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struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out);
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u16 packet_sz = qh->maxpacket;
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+ u8 use_dma = 1;
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+ u16 csr;
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dev_dbg(musb->controller, "%s hw%d urb %p spd%d dev%d ep%d%s "
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"h_addr%02x h_port%02x bytes %d\n",
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@@ -772,9 +774,17 @@ static void musb_ep_program(struct musb *musb, u8 epnum,
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musb_ep_select(musb, mbase, epnum);
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+ if (is_out && !len) {
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+ use_dma = 0;
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+ csr = musb_readw(epio, MUSB_TXCSR);
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+ csr &= ~MUSB_TXCSR_DMAENAB;
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+ musb_writew(epio, MUSB_TXCSR, csr);
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+ hw_ep->tx_channel = NULL;
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+ }
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+
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/* candidate for DMA? */
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dma_controller = musb->dma_controller;
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- if (is_dma_capable() && epnum && dma_controller) {
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+ if (use_dma && is_dma_capable() && epnum && dma_controller) {
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dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel;
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if (!dma_channel) {
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dma_channel = dma_controller->channel_alloc(
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--
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1.7.7.6
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