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usb: xhci-mtk: add support runtime PM

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A dedicated wakeup irq will be used to handle runtime suspend/resume,
we use dev_pm_set_dedicated_wake_irq API to take care of requesting
and attaching wakeup irq, then the suspend/resume framework will help
to enable/disable wakeup irq.

The runtime PM is default off since some platforms may not support it.
users can enable it via power/control (set "auto") in sysfs.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1618031406-15347-3-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2021-04-10 13:10:04 +08:00 committed by Greg Kroah-Hartman
parent fe8e488058
commit 04284eb74e
1 changed files with 124 additions and 16 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

140
drivers/usb/host/xhci-mtk.c
View file

@ -16,6 +16,7 @@
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/pm_wakeirq.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
@ -358,7 +359,6 @@ static int usb_wakeup_of_property_parse(struct xhci_hcd_mtk *mtk,
mtk->uwk_reg_base, mtk->uwk_vers);
return PTR_ERR_OR_ZERO(mtk->uwk);
}
static void usb_wakeup_set(struct xhci_hcd_mtk *mtk, bool enable)
@ -467,6 +467,7 @@ static int xhci_mtk_probe(struct platform_device *pdev)
struct resource *res;
struct usb_hcd *hcd;
int ret = -ENODEV;
int wakeup_irq;
int irq;
if (usb_disabled())
@ -494,6 +495,21 @@ static int xhci_mtk_probe(struct platform_device *pdev)
if (ret)
return ret;
irq = platform_get_irq_byname_optional(pdev, "host");
if (irq < 0) {
if (irq == -EPROBE_DEFER)
return irq;
/* for backward compatibility */
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
}
wakeup_irq = platform_get_irq_byname_optional(pdev, "wakeup");
if (wakeup_irq == -EPROBE_DEFER)
return wakeup_irq;
mtk->lpm_support = of_property_read_bool(node, "usb3-lpm-capable");
mtk->u2_lpm_disable = of_property_read_bool(node, "usb2-lpm-disable");
/* optional property, ignore the error if it does not exist */
@ -506,9 +522,11 @@ static int xhci_mtk_probe(struct platform_device *pdev)
return ret;
}
pm_runtime_set_active(dev);
pm_runtime_use_autosuspend(dev);
pm_runtime_set_autosuspend_delay(dev, 4000);
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
device_enable_async_suspend(dev);
ret = xhci_mtk_ldos_enable(mtk);
if (ret)
@ -518,12 +536,6 @@ static int xhci_mtk_probe(struct platform_device *pdev)
if (ret)
goto disable_ldos;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
ret = irq;
goto disable_clk;
}
hcd = usb_create_hcd(driver, dev, dev_name(dev));
if (!hcd) {
ret = -ENOMEM;
@ -590,8 +602,26 @@ static int xhci_mtk_probe(struct platform_device *pdev)
if (ret)
goto dealloc_usb2_hcd;
if (wakeup_irq > 0) {
ret = dev_pm_set_dedicated_wake_irq(dev, wakeup_irq);
if (ret) {
dev_err(dev, "set wakeup irq %d failed\n", wakeup_irq);
goto dealloc_usb3_hcd;
}
dev_info(dev, "wakeup irq %d\n", wakeup_irq);
}
device_enable_async_suspend(dev);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
pm_runtime_forbid(dev);
return 0;
dealloc_usb3_hcd:
usb_remove_hcd(xhci->shared_hcd);
xhci->shared_hcd = NULL;
dealloc_usb2_hcd:
usb_remove_hcd(hcd);
@ -612,25 +642,26 @@ static int xhci_mtk_probe(struct platform_device *pdev)
xhci_mtk_ldos_disable(mtk);
disable_pm:
pm_runtime_put_sync(dev);
pm_runtime_put_sync_autosuspend(dev);
pm_runtime_disable(dev);
return ret;
}
static int xhci_mtk_remove(struct platform_device *dev)
static int xhci_mtk_remove(struct platform_device *pdev)
{
struct xhci_hcd_mtk *mtk = platform_get_drvdata(dev);
struct xhci_hcd_mtk *mtk = platform_get_drvdata(pdev);
struct usb_hcd *hcd = mtk->hcd;
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
struct usb_hcd *shared_hcd = xhci->shared_hcd;
struct device *dev = &pdev->dev;
pm_runtime_put_noidle(&dev->dev);
pm_runtime_disable(&dev->dev);
pm_runtime_get_sync(dev);
xhci->xhc_state |= XHCI_STATE_REMOVING;
dev_pm_clear_wake_irq(dev);
device_init_wakeup(dev, false);
usb_remove_hcd(shared_hcd);
xhci->shared_hcd = NULL;
device_init_wakeup(&dev->dev, false);
usb_remove_hcd(hcd);
usb_put_hcd(shared_hcd);
usb_put_hcd(hcd);
@ -638,6 +669,10 @@ static int xhci_mtk_remove(struct platform_device *dev)
xhci_mtk_clks_disable(mtk);
xhci_mtk_ldos_disable(mtk);
pm_runtime_disable(dev);
pm_runtime_put_noidle(dev);
pm_runtime_set_suspended(dev);
return 0;
}
@ -701,10 +736,83 @@ static int __maybe_unused xhci_mtk_resume(struct device *dev)
return ret;
}
static int check_rhub_status(struct xhci_hcd *xhci, struct xhci_hub *rhub)
{
u32 suspended_ports;
u32 status;
int num_ports;
int i;
num_ports = rhub->num_ports;
suspended_ports = rhub->bus_state.suspended_ports;
for (i = 0; i < num_ports; i++) {
if (!(suspended_ports & BIT(i))) {
status = readl(rhub->ports[i]->addr);
if (status & PORT_CONNECT)
return -EBUSY;
}
}
return 0;
}
/*
* check the bus whether it could suspend or not
* the bus will suspend if the downstream ports are already suspended,
* or no devices connected.
*/
static int check_bus_status(struct xhci_hcd *xhci)
{
int ret;
ret = check_rhub_status(xhci, &xhci->usb3_rhub);
if (ret)
return ret;
return check_rhub_status(xhci, &xhci->usb2_rhub);
}
static int __maybe_unused xhci_mtk_runtime_suspend(struct device *dev)
{
struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev);
struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd);
int ret = 0;
if (xhci->xhc_state)
return -ESHUTDOWN;
if (device_may_wakeup(dev)) {
ret = check_bus_status(xhci);
if (!ret)
ret = xhci_mtk_suspend(dev);
}
/* -EBUSY: let PM automatically reschedule another autosuspend */
return ret ? -EBUSY : 0;
}
static int __maybe_unused xhci_mtk_runtime_resume(struct device *dev)
{
struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev);
struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd);
int ret = 0;
if (xhci->xhc_state)
return -ESHUTDOWN;
if (device_may_wakeup(dev))
ret = xhci_mtk_resume(dev);
return ret;
}
static const struct dev_pm_ops xhci_mtk_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(xhci_mtk_suspend, xhci_mtk_resume)
SET_RUNTIME_PM_OPS(xhci_mtk_runtime_suspend,
xhci_mtk_runtime_resume, NULL)
};
#define DEV_PM_OPS IS_ENABLED(CONFIG_PM) ? &xhci_mtk_pm_ops : NULL
#define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &xhci_mtk_pm_ops : NULL)
static const struct of_device_id mtk_xhci_of_match[] = {
{ .compatible = "mediatek,mt8173-xhci"},