From: Hema HK <[email protected]> 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 <[email protected]> Signed-off-by: Anand Gadiyar <[email protected]> Signed-off-by: Ajay Kumar Gupta <[email protected]> --- drivers/usb/musb/musbhsdma.c | 13 ++----------- 1 files changed, 2 insertions(+), 11 deletions(-) diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c index 1008044..dc66e43 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) -- 1.6.2.4 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
