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usb: dwc2: Change TxFIFO and RxFIFO flushing flow

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Before flushing fifos required to check AHB master state and
lush when AHB master is in IDLE state.

Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Minas Harutyunyan 2018-01-19 14:44:46 +04:00 committed by Felipe Balbi
parent 92a8dd2646
commit 8f55fd6041
1 changed files with 10 additions and 0 deletions
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10
drivers/usb/dwc2/core.c
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@ -675,6 +675,11 @@ 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);
@ -698,6 +703,11 @@ 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);