From c0f1f8e38fda8e345cad9269c559b4f036378120 Mon Sep 17 00:00:00 2001
From: Hema HK <hemahk@ti.com>
Date: Thu, 24 Jun 2010 23:07:09 +0530
Subject: [PATCH] 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 <hemahk@ti.com>
Signed-off-by: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Acked-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/usb/musb/musbhsdma.c | 13 ++-----------
1 file changed, 2 insertions(+), 11 deletions(-)
diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c
index 1008044a3bbc..dc66e4376d49 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)
--
2.34.1