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usb: dwc3: switch to peripheral mode when exiting

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This allow the phy to enter idle and then suspend.
the K2 platforms require the PHY to be suspended before the USB domain
clock can be turned off.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
This commit is contained in:
Jean-Jacques Hiblot 2019-09-11 11:33:45 +02:00 committed by Marek Vasut
parent a8973731a4
commit bbe3d4a6c1
1 changed files with 13 additions and 0 deletions
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13
drivers/usb/dwc3/core.c
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@ -581,6 +581,12 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
return 0;
}
static void dwc3_gadget_run(struct dwc3 *dwc)
{
dwc3_writel(dwc->regs, DWC3_DCTL, DWC3_DCTL_RUN_STOP);
mdelay(100);
}
static void dwc3_core_exit_mode(struct dwc3 *dwc)
{
switch (dwc->dr_mode) {
@ -598,6 +604,13 @@ static void dwc3_core_exit_mode(struct dwc3 *dwc)
/* do nothing */
break;
}
/*
* switch back to peripheral mode
* This enables the phy to enter idle and then, if enabled, suspend.
*/
dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
dwc3_gadget_run(dwc);
}
#define DWC3_ALIGN_MASK (16 - 1)