[PATCH v2 1/5] usb: xhci-mtk: check return value in suspend/resume hooks

[Chunfeng Yun]

Return error number if encounter errors during suspend and resume.

Signed-off-by: Chunfeng Yun <chunfeng....@mediatek.com>
---
v2: no changes
---
 drivers/usb/host/xhci-mtk.c | 37 +++++++++++++++++++++++++++----------
 1 file changed, 27 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index c1bc40289833..a74764ab914a 100644
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -630,18 +630,12 @@ static int xhci_mtk_remove(struct platform_device *dev)
        return 0;
 }
 
-/*
- * if ip sleep fails, and all clocks are disabled, access register will hang
- * AHB bus, so stop polling roothubs to avoid regs access on bus suspend.
- * and no need to check whether ip sleep failed or not; this will cause SPM
- * to wake up system immediately after system suspend complete if ip sleep
- * fails, it is what we wanted.
- */
 static int __maybe_unused xhci_mtk_suspend(struct device *dev)
 {
        struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev);
        struct usb_hcd *hcd = mtk->hcd;
        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+       int ret;
 
        xhci_dbg(xhci, "%s: stop port polling\n", __func__);
        clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
@@ -649,10 +643,21 @@ static int __maybe_unused xhci_mtk_suspend(struct device 
*dev)
        clear_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
        del_timer_sync(&xhci->shared_hcd->rh_timer);
 
-       xhci_mtk_host_disable(mtk);
+       ret = xhci_mtk_host_disable(mtk);
+       if (ret)
+               goto restart_poll_rh;
+
        xhci_mtk_clks_disable(mtk);
        usb_wakeup_set(mtk, true);
        return 0;
+
+restart_poll_rh:
+       xhci_dbg(xhci, "%s: restart port polling\n", __func__);
+       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);
+       return ret;
 }
 
 static int __maybe_unused xhci_mtk_resume(struct device *dev)
@@ -660,10 +665,16 @@ static int __maybe_unused xhci_mtk_resume(struct device 
*dev)
        struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev);
        struct usb_hcd *hcd = mtk->hcd;
        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+       int ret;
 
        usb_wakeup_set(mtk, false);
-       xhci_mtk_clks_enable(mtk);
-       xhci_mtk_host_enable(mtk);
+       ret = xhci_mtk_clks_enable(mtk);
+       if (ret)
+               goto enable_wakeup;
+
+       ret = xhci_mtk_host_enable(mtk);
+       if (ret)
+               goto disable_clks;
 
        xhci_dbg(xhci, "%s: restart port polling\n", __func__);
        set_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
@@ -671,6 +682,12 @@ static int __maybe_unused xhci_mtk_resume(struct device 
*dev)
        set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
        usb_hcd_poll_rh_status(hcd);
        return 0;
+
+disable_clks:
+       xhci_mtk_clks_disable(mtk);
+enable_wakeup:
+       usb_wakeup_set(mtk, true);
+       return ret;
 }
 
 static const struct dev_pm_ops xhci_mtk_pm_ops = {
-- 
2.18.0