From 2ed9127cff9a255b7671b8d3d938109f68a87961 Mon Sep 17 00:00:00 2001 From: Mantesh Sarasetti Date: Fri, 1 Jun 2012 14:54:30 +0300 Subject: [PATCH] usb: musb: host: Disable MUSB DMA mode incase of DMA channel request failure Currently in case of MUSB DMA channel request failure we are not clearing MUSB_RXCSR_DMAENAB, MUSB_RXCSR_H_AUTOREQ and MUSB_RXCSR_AUTOCLEAR bits of MUSB RXCSR of MUSB DMA. Which is causing failure in receipt of data packets in next transfer. Fix is to disable the MUSB DMA mode and related bits incase of DMA channel request fails Signed-off-by: Mantesh Sarashetti Signed-off-by: Ruslan Bilovol Signed-off-by: Felipe Balbi --- drivers/usb/musb/musb_host.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c index ef8d744800ac..33fc45151b8f 100644 --- a/drivers/usb/musb/musb_host.c +++ b/drivers/usb/musb/musb_host.c @@ -1736,7 +1736,11 @@ void musb_host_rx(struct musb *musb, u8 epnum) c->channel_release(dma); hw_ep->rx_channel = NULL; dma = NULL; - /* REVISIT reset CSR */ + val = musb_readw(epio, MUSB_RXCSR); + val &= ~(MUSB_RXCSR_DMAENAB + | MUSB_RXCSR_H_AUTOREQ + | MUSB_RXCSR_AUTOCLEAR); + musb_writew(epio, MUSB_RXCSR, val); } } #endif /* Mentor DMA */