From: Hema HK Date: Thu, 24 Jun 2010 17:37:09 +0000 (+0530) Subject: USB: musb: Enable the maximum supported burst mode for DMA X-Git-Tag: v2.6.35-rc4~18^2~2 X-Git-Url: https://bbs.cooldavid.org/git/?p=net-next-2.6.git;a=commitdiff_plain;h=c0f1f8e38fda8e345cad9269c559b4f036378120 USB: musb: Enable the maximum supported burst mode for DMA Setting MUSB Burst Mode 3 automatically enables support for lower burst modes (BURST4, BURST8, BURST16 or bursts of unspecified length). There is no need to set these burst modes based on the packet size. Also enable the burst mode for both mode1 and mode0. This is a fix for buggy hardware - having the lower burst modes enabled can potentially cause lockups of the DMA engine used in OMAP2/3/4 chips. Signed-off-by: Hema HK Signed-off-by: Anand Gadiyar Signed-off-by: Ajay Kumar Gupta Acked-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c index 1008044a3bb..dc66e4376d4 100644 --- a/drivers/usb/musb/musbhsdma.c +++ b/drivers/usb/musb/musbhsdma.c @@ -132,18 +132,9 @@ static void configure_channel(struct dma_channel *channel, if (mode) { csr |= 1 << MUSB_HSDMA_MODE1_SHIFT; BUG_ON(len < packet_sz); - - if (packet_sz >= 64) { - csr |= MUSB_HSDMA_BURSTMODE_INCR16 - << MUSB_HSDMA_BURSTMODE_SHIFT; - } else if (packet_sz >= 32) { - csr |= MUSB_HSDMA_BURSTMODE_INCR8 - << MUSB_HSDMA_BURSTMODE_SHIFT; - } else if (packet_sz >= 16) { - csr |= MUSB_HSDMA_BURSTMODE_INCR4 - << MUSB_HSDMA_BURSTMODE_SHIFT; - } } + csr |= MUSB_HSDMA_BURSTMODE_INCR16 + << MUSB_HSDMA_BURSTMODE_SHIFT; csr |= (musb_channel->epnum << MUSB_HSDMA_ENDPOINT_SHIFT) | (1 << MUSB_HSDMA_ENABLE_SHIFT)