From: Minas Harutyunyan <hmi...@synopsys.com>
Before flushing fifos required to check AHB master state and
lush when AHB master is in IDLE state.
Signed-off-by: Minas Harutyunyan <hmi...@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovma...@synopsys.com>
---
drivers/usb/dwc2/core.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c
index 6868ddf972f7..64a0b2068b14 100644
--- a/drivers/usb/dwc2/core.c
+++ b/drivers/usb/dwc2/core.c
@@ -658,6 +658,11 @@ void dwc2_flush_tx_fifo(struct dwc2_hsotg *hsotg, const
int num)
dev_vdbg(hsotg->dev, "Flush Tx FIFO %d\n", num);
+ /* Wait for AHB master IDLE state */
+ if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, GRSTCTL_AHBIDLE, 10000))
+ dev_warn(hsotg->dev, "%s: HANG! AHB Idle GRSCTL\n",
+ __func__);
+
greset = GRSTCTL_TXFFLSH;
greset |= num << GRSTCTL_TXFNUM_SHIFT & GRSTCTL_TXFNUM_MASK;
dwc2_writel(greset, hsotg->regs + GRSTCTL);
@@ -681,6 +686,11 @@ void dwc2_flush_rx_fifo(struct dwc2_hsotg *hsotg)
dev_vdbg(hsotg->dev, "%s()\n", __func__);
+ /* Wait for AHB master IDLE state */
+ if (dwc2_hsotg_wait_bit_set(hsotg, GRSTCTL, GRSTCTL_AHBIDLE, 10000))
+ dev_warn(hsotg->dev, "%s: HANG! AHB Idle GRSCTL\n",
+ __func__);
+
greset = GRSTCTL_RXFFLSH;
dwc2_writel(greset, hsotg->regs + GRSTCTL);
--
2.11.0
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
