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Date: Tue, 22 Dec 2020 17:34:41 +0800
From: Chunfeng Yun <chunfeng.yun@...iatek.com>
To: Ikjoon Jang <ikjn@...omium.org>
CC: Chunfeng Yun <chunfeng.yun@...iatek.com>,
Tianping Fang <tianping.fang@...iatek.com>,
Zhanyong Wang <zhangyong.wang@...iatek.com>,
<linux-mediatek@...ts.infradead.org>, <linux-usb@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, CK Hu <ck.hu@...iatek.com>,
Zhanyong Wang <zhanyong.wang@...iatek.com>
Subject: [RFC PATCH v3 4/5] usb: xhci-mtk: add support runtime pm
From: CK Hu <ck.hu@...iatek.com>
add support runtime pm feature
Signed-off-by: Zhanyong Wang <zhanyong.wang@...iatek.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
v3:
1. fix some issues
2. remove attribute files
v2: fix error caused by request irq suggested by CK
---
drivers/usb/host/xhci-mtk.c | 285 +++++++++++++++++++++++++++++++++++-
drivers/usb/host/xhci-mtk.h | 14 ++
2 files changed, 294 insertions(+), 5 deletions(-)
mode change 100755 => 100644 drivers/usb/host/xhci-mtk.c
diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
old mode 100755
new mode 100644
index 34bd3de090b1..c07d54acbcb7
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -14,6 +14,7 @@
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
@@ -77,6 +78,72 @@ enum ssusb_uwk_vers {
SSUSB_UWK_V3,
};
+int xhci_mtk_runtime_ready;
+
+static int xhci_mtk_runtime_resume(struct device *dev);
+
+static void xhci_mtk_seal_work(struct work_struct *work)
+{
+ struct xhci_hcd_mtk *mtk =
+ container_of(work, struct xhci_hcd_mtk, seal.work);
+ struct usb_hcd *hcd = mtk->hcd;
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+ xhci_dbg(xhci, "spm unseals xHCI controller %i\n", mtk->seal_status);
+ if (mtk->seal_status == SEAL_SUSPENDED) {
+ mtk->seal_status = SEAL_RESUMING;
+ pm_runtime_mark_last_busy(mtk->dev);
+ pm_runtime_put_sync_autosuspend(mtk->dev);
+ } else {
+ /*
+ * FIXME: Sometimes seal_status will keep it on SEAL_RESUMING staus not to expect
+ * since pm_runtime_put_sync_autosuspend doesn't invoke runtime_resume of callback.
+ * and to survey why not to invoke runtime_resume callback named
+ * xhci_mtk_runtime_resume in time in short feature, Herely provide one solution
+ * that make sure seal_status to match h/w state machine,and MTK xHCI clocks
+ * on as soon as unseal event received.
+ */
+ if (mtk->seal_status == SEAL_RESUMING)
+ xhci_mtk_runtime_resume(mtk->dev);
+ else
+ xhci_warn(xhci,
+ "Ignore seal wakeup source disordered in xHCI controller\n");
+ }
+}
+
+static irqreturn_t xhci_mtk_seal_irq(int irq, void *data)
+{
+ struct xhci_hcd_mtk *mtk = data;
+ struct usb_hcd *hcd = mtk->hcd;
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+ xhci_dbg(xhci, "seal irq ISR invoked\n");
+
+ schedule_delayed_work(&mtk->seal, 0);
+
+ return IRQ_HANDLED;
+}
+
+static void xhci_mtk_seal_wakeup_enable(struct xhci_hcd_mtk *mtk, bool enable)
+{
+ struct irq_desc *desc;
+ struct device *dev = mtk->dev;
+
+ if (mtk && mtk->seal_irq) {
+ desc = irq_to_desc(mtk->seal_irq);
+ if (enable) {
+ desc->irq_data.chip->irq_ack(&desc->irq_data);
+ enable_irq(mtk->seal_irq);
+ dev_dbg(dev, "%s: enable_irq %i\n",
+ __func__, mtk->seal_irq);
+ } else {
+ disable_irq(mtk->seal_irq);
+ dev_dbg(dev, "%s: disable_irq %i\n",
+ __func__, mtk->seal_irq);
+ }
+ }
+}
+
static int xhci_mtk_host_enable(struct xhci_hcd_mtk *mtk)
{
struct mu3c_ippc_regs __iomem *ippc = mtk->ippc_regs;
@@ -347,7 +414,6 @@ 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)
@@ -482,9 +548,11 @@ 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,
+ CONFIG_USB_AUTOSUSPEND_DELAY * 1000);
pm_runtime_enable(dev);
- pm_runtime_get_sync(dev);
- device_enable_async_suspend(dev);
ret = xhci_mtk_ldos_enable(mtk);
if (ret)
@@ -499,6 +567,14 @@ static int xhci_mtk_probe(struct platform_device *pdev)
ret = irq;
goto disable_clk;
}
+ dev_dbg(dev, "irq %i\n", irq);
+
+ mtk->seal_irq = platform_get_irq_optional(pdev, 1);
+ if (mtk->seal_irq < 0) {
+ ret = mtk->seal_irq;
+ goto disable_clk;
+ }
+ dev_dbg(dev, "seal_irq %i\n", mtk->seal_irq);
hcd = usb_create_hcd(driver, dev, dev_name(dev));
if (!hcd) {
@@ -565,6 +641,27 @@ static int xhci_mtk_probe(struct platform_device *pdev)
if (ret)
goto dealloc_usb2_hcd;
+ INIT_DELAYED_WORK(&mtk->seal, xhci_mtk_seal_work);
+ snprintf(mtk->seal_descr, sizeof(mtk->seal_descr), "seal%s:usb%d",
+ hcd->driver->description, hcd->self.busnum);
+ ret = devm_request_irq(dev, mtk->seal_irq, &xhci_mtk_seal_irq,
+ IRQF_TRIGGER_FALLING, mtk->seal_descr, mtk);
+ if (ret != 0) {
+ dev_err(dev, "seal request interrupt %d failed\n",
+ mtk->seal_irq);
+ goto dealloc_usb2_hcd;
+ }
+ xhci_mtk_seal_wakeup_enable(mtk, false);
+
+ device_enable_async_suspend(dev);
+ xhci_mtk_runtime_ready = 1;
+
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_autosuspend(dev);
+
+ dev_dbg(dev, "%s: xhci_mtk_runtime_ready %i",
+ __func__, xhci_mtk_runtime_ready);
+
return 0;
dealloc_usb2_hcd:
@@ -587,7 +684,7 @@ 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;
}
@@ -602,6 +699,7 @@ static int xhci_mtk_remove(struct platform_device *dev)
pm_runtime_put_noidle(&dev->dev);
pm_runtime_disable(&dev->dev);
+ xhci_mtk_runtime_ready = 0;
usb_remove_hcd(shared_hcd);
xhci->shared_hcd = NULL;
device_init_wakeup(&dev->dev, false);
@@ -638,6 +736,7 @@ static int __maybe_unused xhci_mtk_suspend(struct device *dev)
xhci_mtk_host_disable(mtk);
xhci_mtk_clks_disable(mtk);
usb_wakeup_set(mtk, true);
+
return 0;
}
@@ -659,10 +758,185 @@ static int __maybe_unused xhci_mtk_resume(struct device *dev)
return 0;
}
+static int __maybe_unused xhci_mtk_bus_status(struct device *dev)
+{
+ struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev);
+ struct usb_hcd *hcd;
+ struct xhci_hcd *xhci;
+ struct xhci_hub *usb2_rhub;
+ struct xhci_hub *usb3_rhub;
+ struct xhci_bus_state *bus_state;
+ struct xhci_port *port;
+ u32 usb2_suspended_ports = -1;
+ u32 usb3_suspended_ports = -1;
+ u16 status;
+ int num_ports;
+ int ret = 0;
+ int i;
+
+ if (!mtk->hcd)
+ return -ESHUTDOWN;
+
+ hcd = mtk->hcd;
+ xhci = hcd_to_xhci(hcd);
+ if ((xhci->xhc_state & XHCI_STATE_REMOVING) ||
+ (xhci->xhc_state & XHCI_STATE_HALTED)) {
+ return -ESHUTDOWN;
+ }
+
+ usb2_rhub = &xhci->usb2_rhub;
+ if (usb2_rhub) {
+ bus_state = &usb2_rhub->bus_state;
+ num_ports = usb2_rhub->num_ports;
+ usb2_suspended_ports = bus_state->suspended_ports;
+ usb2_suspended_ports ^= (BIT(num_ports) - 1);
+ usb2_suspended_ports &= (BIT(num_ports) - 1);
+ for (i = 0; i < num_ports; i++) {
+ if (usb2_suspended_ports & (1UL << i)) {
+ port = usb2_rhub->ports[i];
+ status = readl(port->addr);
+
+ xhci_dbg(xhci,
+ "USB20: portsc[%i]: 0x%04X\n",
+ i, status);
+
+ if (!(status & PORT_CONNECT))
+ usb2_suspended_ports &= ~(1UL << i);
+ }
+ }
+
+ if (usb2_suspended_ports) {
+ ret = -EBUSY;
+ goto ebusy;
+ }
+ }
+
+ usb3_rhub = &xhci->usb3_rhub;
+ if (usb3_rhub) {
+ bus_state = &usb3_rhub->bus_state;
+ num_ports = usb3_rhub->num_ports;
+ usb3_suspended_ports = bus_state->suspended_ports;
+ usb3_suspended_ports ^= (BIT(num_ports) - 1);
+ usb3_suspended_ports &= (BIT(num_ports) - 1);
+ for (i = 0; i < num_ports; i++) {
+ if (usb3_suspended_ports & BIT(i)) {
+ port = usb3_rhub->ports[i];
+ status = readl(port->addr);
+
+ xhci_dbg(xhci, "USB3: portsc[%i]: 0x%04X\n",
+ i, status);
+
+ if (!(status & PORT_CONNECT))
+ usb3_suspended_ports &= ~BIT(i);
+ }
+ }
+
+ if (usb3_suspended_ports) {
+ ret = -EBUSY;
+ goto ebusy;
+ }
+ }
+
+ebusy:
+ xhci_dbg(xhci, "%s: USB2: 0x%08X, USB3: 0x%08X ret: %i\n",
+ __func__, usb2_suspended_ports,
+ usb3_suspended_ports, ret);
+
+ return ret;
+}
+
+static int __maybe_unused xhci_mtk_runtime_suspend(struct device *dev)
+{
+ bool wakeup = device_may_wakeup(dev);
+ struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev);
+ struct usb_hcd *hcd;
+ struct xhci_hcd *xhci;
+ int ret = 0;
+
+ if (!mtk->hcd)
+ return -ESHUTDOWN;
+
+ hcd = mtk->hcd;
+ xhci = hcd_to_xhci(hcd);
+ if ((xhci->xhc_state & XHCI_STATE_REMOVING) ||
+ (xhci->xhc_state & XHCI_STATE_HALTED)) {
+ return -ESHUTDOWN;
+ }
+
+ mtk->seal_status = SEAL_BUSY;
+ ret = xhci_mtk_bus_status(dev);
+ if (wakeup && !ret) {
+ mtk->seal_status = SEAL_SUSPENDING;
+ xhci_mtk_suspend(dev);
+ xhci_mtk_seal_wakeup_enable(mtk, true);
+ mtk->seal_status = SEAL_SUSPENDED;
+ xhci_dbg(xhci, "%s: seals xHCI controller\n", __func__);
+ }
+
+ xhci_dbg(xhci, "%s: seals wakeup = %i, ret = %i!\n",
+ __func__, wakeup, ret);
+
+ return ret;
+}
+
+static int __maybe_unused xhci_mtk_runtime_resume(struct device *dev)
+{
+ bool wakeup = device_may_wakeup(dev);
+ struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev);
+ struct usb_hcd *hcd;
+ struct xhci_hcd *xhci;
+
+ if (!mtk->hcd)
+ return -ESHUTDOWN;
+
+ hcd = mtk->hcd;
+ xhci = hcd_to_xhci(hcd);
+ if ((xhci->xhc_state & XHCI_STATE_REMOVING) ||
+ (xhci->xhc_state & XHCI_STATE_HALTED)) {
+ return -ESHUTDOWN;
+ }
+
+ /*
+ * list cases by one extra interrupt named seal to process!!!
+ * Who to process these module reinitilization after SPM wakeup
+ * case 1: usb remote wakeup, therefore xHCI need reinitilizate also.
+ * case 2: other-wakeup-source wakeup, therefore, xHCI need reinit
+ * case 3: usb client driver can invoke it in runtime mechanism
+ * case 4: user active
+ */
+ if (wakeup) {
+ xhci_mtk_seal_wakeup_enable(mtk, false);
+ xhci_mtk_resume(dev);
+ xhci_dbg(xhci, "%s: unseals xHCI controller\n", __func__);
+ }
+ mtk->seal_status = SEAL_RESUMED;
+
+ xhci_dbg(xhci, "%s: unseals wakeup = %i\n", __func__, wakeup);
+
+ return 0;
+}
+
+static int __maybe_unused xhci_mtk_runtime_idle(struct device *dev)
+{
+ int ret = 0;
+
+ dev_dbg(dev, "%s: xhci_mtk_runtime_ready %i",
+ __func__, xhci_mtk_runtime_ready);
+
+ if (!xhci_mtk_runtime_ready)
+ ret = -EAGAIN;
+
+ 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,
+ xhci_mtk_runtime_idle)
};
-#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)
#ifdef CONFIG_OF
static const struct of_device_id mtk_xhci_of_match[] = {
@@ -686,6 +960,7 @@ MODULE_ALIAS("platform:xhci-mtk");
static int __init xhci_mtk_init(void)
{
+ xhci_mtk_runtime_ready = 0;
xhci_init_driver(&xhci_mtk_hc_driver, &xhci_mtk_overrides);
return platform_driver_register(&mtk_xhci_driver);
}
diff --git a/drivers/usb/host/xhci-mtk.h b/drivers/usb/host/xhci-mtk.h
index 323b281933b9..103d83ce6a3e 100644
--- a/drivers/usb/host/xhci-mtk.h
+++ b/drivers/usb/host/xhci-mtk.h
@@ -133,6 +133,14 @@ struct mu3c_ippc_regs {
__le32 reserved3[33]; /* 0x80 ~ 0xff */
};
+enum xhci_mtk_seal {
+ SEAL_BUSY = 0,
+ SEAL_SUSPENDING,
+ SEAL_SUSPENDED,
+ SEAL_RESUMING,
+ SEAL_RESUMED
+};
+
struct xhci_hcd_mtk {
struct device *dev;
struct usb_hcd *hcd;
@@ -158,6 +166,12 @@ struct xhci_hcd_mtk {
struct regmap *uwk;
u32 uwk_reg_base;
u32 uwk_vers;
+
+ /* usb eint wakeup source */
+ int seal_irq;
+ enum xhci_mtk_seal seal_status;
+ struct delayed_work seal;
+ char seal_descr[32]; /* "seal" + driver + bus # */
};
static inline struct xhci_hcd_mtk *hcd_to_mtk(struct usb_hcd *hcd)
--
2.18.0
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