usb: s3c-hsotg: Avoid TxFIFO corruption in DMA mode

Writing to TxFIFO relates only to Slave mode and leads to
TxFIFO corruption in DMA mode.

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 03de169ab3651b826d3def9e5e388d7ff11050b6..8db23660b5e2d42dab04c85efa7eda2f3f804a8c 100644 (file)
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -1921,7 +1921,8 @@ static void s3c_hsotg_epint(struct s3c_hsotg *hsotg, unsigned int idx,
                    ints & S3C_DIEPMSK_TxFIFOEmpty) {
                        dev_dbg(hsotg->dev, "%s: ep%d: TxFIFOEmpty\n",
                                __func__, idx);
-                       s3c_hsotg_trytx(hsotg, hs_ep);
+                       if (!using_dma(hsotg))
+                               s3c_hsotg_trytx(hsotg, hs_ep);
                }
        }
 }