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authorArtur Petrosyan <Arthur.Petrosyan@synopsys.com>2021-04-13 11:37:22 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-04-13 12:25:12 +0200
commitef5e0eec476426791d3d5e74fa96b2a30076922d (patch)
tree20bdbe580f4c14b705fcb153f2cfdcad181bbe3e
parent50fb0c128b6e8df62200ba85c05ecd6b1396476d (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.c22
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;