Re: [PATCH v1 1/1] usb: xhci: do not create and register shared_hcd when USB3.0 is disabled

From: Thang Q. Nguyen
Date: Thu Jan 04 2018 - 00:17:50 EST

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Hi,

On Sat, Dec 16, 2017 at 10:45 AM, Thang Q. Nguyen <tqnguyen@xxxxxxx> wrote:
> From: Tung Nguyen <tunguyen@xxxxxxx>
>
> 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@xxxxxxx>
> Signed-off-by: Thang Q. Nguyen <tqnguyen@xxxxxxx>
> ---
> 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
>
Do you have any comment on this patch?

Next message: Dan Williams: "Re: [RFC PATCH] asm/generic: introduce if_nospec and nospec_barrier"
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