usb: s3c-hsotg: Fix maximum patcket size setting for EP0
MPS field of DOEPCTL0 is read only.
Signed-off-by: Anton Tikhomirov <av.tikhomirov@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index e3fe5fd..03de169 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -1696,10 +1696,12 @@
reg |= mpsval;
writel(reg, regs + S3C_DIEPCTL(ep));
- reg = readl(regs + S3C_DOEPCTL(ep));
- reg &= ~S3C_DxEPCTL_MPS_MASK;
- reg |= mpsval;
- writel(reg, regs + S3C_DOEPCTL(ep));
+ if (ep) {
+ reg = readl(regs + S3C_DOEPCTL(ep));
+ reg &= ~S3C_DxEPCTL_MPS_MASK;
+ reg |= mpsval;
+ writel(reg, regs + S3C_DOEPCTL(ep));
+ }
return;