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usb: chipidea: udc: add suspend/resume support for device controller 

The controller's power may be powered off during system suspend. This
will add suspend/resume support when the controller suffers power lost.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Acked-by: Peter Chen <peter.chen@kernel.org>
Link: https://lore.kernel.org/r/20221013151442.3262951-5-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xu Yang 2022-10-13 23:14:38 +08:00 committed by Greg Kroah-Hartman
parent 2f64d6a6cd
commit 235ffc17d0
1 changed files with 32 additions and 0 deletions
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32
drivers/usb/chipidea/udc.c
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@ -2181,6 +2181,34 @@ static void udc_id_switch_for_host(struct ci_hdrc *ci)
ci->platdata->pins_default);
}
#ifdef CONFIG_PM_SLEEP
static void udc_suspend(struct ci_hdrc *ci)
{
/*
* Set OP_ENDPTLISTADDR to be non-zero for
* checking if controller resume from power lost
* in non-host mode.
*/
if (hw_read(ci, OP_ENDPTLISTADDR, ~0) == 0)
hw_write(ci, OP_ENDPTLISTADDR, ~0, ~0);
}
static void udc_resume(struct ci_hdrc *ci, bool power_lost)
{
if (power_lost) {
if (ci->is_otg)
hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
OTGSC_BSVIS | OTGSC_BSVIE);
if (ci->vbus_active)
usb_gadget_vbus_disconnect(&ci->gadget);
}
/* Restore value 0 if it was set for power lost check */
if (hw_read(ci, OP_ENDPTLISTADDR, ~0) == 0xFFFFFFFF)
hw_write(ci, OP_ENDPTLISTADDR, ~0, 0);
}
#endif
/**
* ci_hdrc_gadget_init - initialize device related bits
* @ci: the controller
@ -2201,6 +2229,10 @@ int ci_hdrc_gadget_init(struct ci_hdrc *ci)
rdrv->start = udc_id_switch_for_device;
rdrv->stop = udc_id_switch_for_host;
#ifdef CONFIG_PM_SLEEP
rdrv->suspend = udc_suspend;
rdrv->resume = udc_resume;
#endif
rdrv->irq = udc_irq;
rdrv->name = "gadget";