From f5090044763fd954a002a6ef466fcbc21033518f Mon Sep 17 00:00:00 2001
From: Gregory Herrero <gregory.herrero@intel.com>
Date: Fri, 9 Jan 2015 13:38:47 +0100
Subject: [PATCH] usb: dwc2: gadget: don't erase gahbcfg register when enabling
 dma

Do a read-modify-write instead of only setting DMAEn bit.

Tested-by: Robert Baldyga <r.baldyga@samsung.com>
Acked-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Gregory Herrero <gregory.herrero@intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 drivers/usb/dwc2/gadget.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index b69b8fa81779..b98622f2092d 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -2827,8 +2827,8 @@ static void s3c_hsotg_init(struct dwc2_hsotg *hsotg)
 	writel(GUSBCFG_PHYIF16 | GUSBCFG_TOUTCAL(7) | (0x5 << 10),
 	       hsotg->regs + GUSBCFG);
 
-	writel(using_dma(hsotg) ? GAHBCFG_DMA_EN : 0x0,
-	       hsotg->regs + GAHBCFG);
+	if (using_dma(hsotg))
+		__orr32(hsotg->regs + GAHBCFG, GAHBCFG_DMA_EN);
 }
 
 /**
-- 
2.11.0