* [13/17] usb: dwc2: Change TxFIFO and RxFIFO flushing flow
@ 2018-01-19 10:44 Grigor Tovmasyan
0 siblings, 0 replies; only message in thread
From: Grigor Tovmasyan @ 2018-01-19 10:44 UTC (permalink / raw
To: John Youn, Felipe Balbi, Greg Kroah-Hartman, linux-usb
Cc: Minas Harutyunyan, Grigor Tovmasyan
From: Minas Harutyunyan <hminas@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 <hminas@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@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);
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2018-01-19 10:44 [13/17] usb: dwc2: Change TxFIFO and RxFIFO flushing flow Grigor Tovmasyan
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