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Message-Id: <1513395904-5139-1-git-send-email-tqnguyen@apm.com>
Date: Sat, 16 Dec 2017 10:45:04 +0700
From: "Thang Q. Nguyen" <tqnguyen@....com>
To: Mathias Nyman <mathias.nyman@...el.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Thang Nguyen <tqnguyen@....com>, Tung Nguyen <tunguyen@....com>,
Phong Vo <pvo@....com>, Loc Ho <lho@....com>, patches@....com
Subject: [PATCH v1 1/1] usb: xhci: do not create and register shared_hcd when USB3.0 is disabled
From: Tung Nguyen <tunguyen@....com>
Currently, hcd->shared_hcd always creates and registers to the usb-core.
If, for some reasons, USB3 downstream port is disabled, no roothub port for
USB3.0 is found. This causes kernel to display an error:
hub 2-0:1.0: config failed, hub doesn't have any ports! (err -19)
This patch checks, creates and registers shared_hcd if USB3.0 downstream
port is available.
Signed-off-by: Tung Nguyen <tunguyen@....com>
Signed-off-by: Thang Q. Nguyen <tqnguyen@....com>
---
drivers/usb/host/xhci-mem.c | 2 +-
drivers/usb/host/xhci-plat.c | 26 +++++++++++----------
drivers/usb/host/xhci.c | 54 ++++++++++++++++++++++++++++++++------------
3 files changed, 54 insertions(+), 28 deletions(-)
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 554a8a5..157d1e7 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1067,7 +1067,7 @@ static u32 xhci_find_real_port_number(struct xhci_hcd *xhci,
struct usb_device *top_dev;
struct usb_hcd *hcd;
- if (udev->speed >= USB_SPEED_SUPER)
+ if (udev->speed >= USB_SPEED_SUPER && xhci->shared_hcd)
hcd = xhci->shared_hcd;
else
hcd = xhci->main_hcd;
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 6f03830..e812e3d 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -253,12 +253,6 @@ static int xhci_plat_probe(struct platform_device *pdev)
xhci->clk = clk;
xhci->main_hcd = hcd;
- xhci->shared_hcd = __usb_create_hcd(driver, sysdev, &pdev->dev,
- dev_name(&pdev->dev), hcd);
- if (!xhci->shared_hcd) {
- ret = -ENOMEM;
- goto disable_clk;
- }
if (device_property_read_bool(sysdev, "usb2-lpm-disable"))
xhci->quirks |= XHCI_HW_LPM_DISABLE;
@@ -290,12 +284,20 @@ static int xhci_plat_probe(struct platform_device *pdev)
if (ret)
goto disable_usb_phy;
- if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
- xhci->shared_hcd->can_do_streams = 1;
-
- ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
- if (ret)
- goto dealloc_usb2_hcd;
+ if (xhci->num_usb3_ports > 0) {
+ xhci->shared_hcd = __usb_create_hcd(driver, sysdev, &pdev->dev,
+ dev_name(&pdev->dev), hcd);
+ if (!xhci->shared_hcd) {
+ ret = -ENOMEM;
+ goto disable_clk;
+ }
+ if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
+ xhci->shared_hcd->can_do_streams = 1;
+
+ ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
+ if (ret)
+ goto dealloc_usb2_hcd;
+ }
device_enable_async_suspend(&pdev->dev);
pm_runtime_put_noidle(&pdev->dev);
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 05104bd..4824bf6 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -417,12 +417,14 @@ static void compliance_mode_recovery(struct timer_list *t)
i + 1);
xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
"Attempting compliance mode recovery");
- hcd = xhci->shared_hcd;
+ if (xhci->shared_hcd) {
+ hcd = xhci->shared_hcd;
- if (hcd->state == HC_STATE_SUSPENDED)
- usb_hcd_resume_root_hub(hcd);
+ if (hcd->state == HC_STATE_SUSPENDED)
+ usb_hcd_resume_root_hub(hcd);
- usb_hcd_poll_rh_status(hcd);
+ usb_hcd_poll_rh_status(hcd);
+ }
}
}
@@ -611,6 +613,18 @@ int xhci_run(struct usb_hcd *hcd)
if (ret)
xhci_free_command(xhci, command);
}
+ /*
+ * Execute xhci_start() in case xhci->shared_hcd is not registered.
+ * If the xhci->shared_hcd doesn't exist, no one triggers to start
+ * the xhci which should be done before exitting run function
+ */
+ if (!xhci->shared_hcd) {
+ if (xhci_start(xhci)) {
+ xhci_halt(xhci);
+ return -ENODEV;
+ }
+ xhci->cmd_ring_state = CMD_RING_STATE_RUNNING;
+ }
xhci_dbg_trace(xhci, trace_xhci_dbg_init,
"Finished xhci_run for USB2 roothub");
@@ -861,8 +875,8 @@ int xhci_suspend(struct xhci_hcd *xhci, bool do_wakeup)
if (!hcd->state)
return 0;
- if (hcd->state != HC_STATE_SUSPENDED ||
- xhci->shared_hcd->state != HC_STATE_SUSPENDED)
+ if (hcd->state != HC_STATE_SUSPENDED || (xhci->shared_hcd &&
+ xhci->shared_hcd->state != HC_STATE_SUSPENDED))
return -EINVAL;
xhci_dbc_suspend(xhci);
@@ -875,12 +889,15 @@ int xhci_suspend(struct xhci_hcd *xhci, bool do_wakeup)
xhci_dbg(xhci, "%s: stopping port polling.\n", __func__);
clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
del_timer_sync(&hcd->rh_timer);
- clear_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
- del_timer_sync(&xhci->shared_hcd->rh_timer);
+ if (xhci->shared_hcd) {
+ clear_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
+ del_timer_sync(&xhci->shared_hcd->rh_timer);
+ }
spin_lock_irq(&xhci->lock);
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
- clear_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
+ if (xhci->shared_hcd)
+ clear_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
/* step 1: stop endpoint */
/* skipped assuming that port suspend has done */
@@ -961,7 +978,8 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
msleep(100);
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
- set_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
+ if (xhci->shared_hcd)
+ set_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
spin_lock_irq(&xhci->lock);
if (xhci->quirks & XHCI_RESET_ON_RESUME)
@@ -998,7 +1016,9 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
/* Let the USB core know _both_ roothubs lost power. */
usb_root_hub_lost_power(xhci->main_hcd->self.root_hub);
- usb_root_hub_lost_power(xhci->shared_hcd->self.root_hub);
+ if (xhci->shared_hcd)
+ usb_root_hub_lost_power(
+ xhci->shared_hcd->self.root_hub);
xhci_dbg(xhci, "Stop HCD\n");
xhci_halt(xhci);
@@ -1039,7 +1059,8 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
retval = xhci_run(secondary_hcd);
}
hcd->state = HC_STATE_SUSPENDED;
- xhci->shared_hcd->state = HC_STATE_SUSPENDED;
+ if (xhci->shared_hcd)
+ xhci->shared_hcd->state = HC_STATE_SUSPENDED;
goto done;
}
@@ -1068,7 +1089,8 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
/* Resume root hubs only when have pending events. */
status = readl(&xhci->op_regs->status);
if (status & STS_EINT) {
- usb_hcd_resume_root_hub(xhci->shared_hcd);
+ if (xhci->shared_hcd)
+ usb_hcd_resume_root_hub(xhci->shared_hcd);
usb_hcd_resume_root_hub(hcd);
}
}
@@ -1087,8 +1109,10 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
/* Re-enable port polling. */
xhci_dbg(xhci, "%s: starting port polling.\n", __func__);
- set_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
- usb_hcd_poll_rh_status(xhci->shared_hcd);
+ if (xhci->shared_hcd) {
+ set_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
+ usb_hcd_poll_rh_status(xhci->shared_hcd);
+ }
set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
usb_hcd_poll_rh_status(hcd);
--
1.8.3.1
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