diff options
| author | Artur Petrosyan <Arthur.Petrosyan@synopsys.com> | 2021-04-13 11:37:22 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-13 12:25:12 +0200 |
| commit | ef5e0eec476426791d3d5e74fa96b2a30076922d (patch) | |
| tree | 20bdbe580f4c14b705fcb153f2cfdcad181bbe3e | |
| parent | 50fb0c128b6e8df62200ba85c05ecd6b1396476d (diff) | |
usb: dwc2: Add clock gating exiting flow by system resume
If not hibernation nor partial power down are supported,
port resume is done using the clock gating programming flow.
Adds a new flow of exiting clock gating when PC is
resumed.
Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210413073723.BA0FEA022E@mailhost.synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/dwc2/hcd.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index 09dcd37b9ef8..04a1b53d65af 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -4445,6 +4445,28 @@ static int _dwc2_hcd_resume(struct usb_hcd *hcd) break; case DWC2_POWER_DOWN_PARAM_HIBERNATION: case DWC2_POWER_DOWN_PARAM_NONE: + /* + * If not hibernation nor partial power down are supported, + * port resume is done using the clock gating programming flow. + */ + spin_unlock_irqrestore(&hsotg->lock, flags); + dwc2_host_exit_clock_gating(hsotg, 0); + + /* + * Initialize the Core for Host mode, as after system resume + * the global interrupts are disabled. + */ + dwc2_core_init(hsotg, false); + dwc2_enable_global_interrupts(hsotg); + dwc2_hcd_reinit(hsotg); + spin_lock_irqsave(&hsotg->lock, flags); + + /* + * Set HW accessible bit before powering on the controller + * since an interrupt may rise. + */ + set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + break; default: hsotg->lx_state = DWC2_L0; goto unlock; |