linux-kernel - [PATCH v6] xhci: re-initialize the HC during resume if HCE was set

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Message-Id: <20220129093036.488231-1-pumahsu@google.com>
Date:   Sat, 29 Jan 2022 17:30:36 +0800
From:   Puma Hsu <pumahsu@...gle.com>
To:     mathias.nyman@...el.com, gregkh@...uxfoundation.org
Cc:     s.shtylyov@....ru, albertccwang@...gle.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Puma Hsu <pumahsu@...gle.com>, stable@...r.kernel.org
Subject: [PATCH v6] xhci: re-initialize the HC during resume if HCE was set

When HCE(Host Controller Error) is set, it means an internal
error condition has been detected. Software needs to re-initialize
the HC, so add this check in xhci resume.

Cc: stable@...r.kernel.org
Signed-off-by: Puma Hsu <pumahsu@...gle.com>
---
v2: Follow Sergey Shtylyov <s.shtylyov@....ru>'s comment.
v3: Add stable@...r.kernel.org for stable release.
v4: Refine the commit message.
v5: Add a debug log. Follow Mathias Nyman <mathias.nyman@...ux.intel.com>'s comment.
v6: Fix the missing declaration for str.

 drivers/usb/host/xhci.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index dc357cabb265..6f1198068004 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1091,6 +1091,7 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
 	int			retval = 0;
 	bool			comp_timer_running = false;
 	bool			pending_portevent = false;
+	char			str[XHCI_MSG_MAX];
 
 	if (!hcd->state)
 		return 0;
@@ -1146,8 +1147,10 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
 		temp = readl(&xhci->op_regs->status);
 	}
 
-	/* If restore operation fails, re-initialize the HC during resume */
-	if ((temp & STS_SRE) || hibernated) {
+	/* If restore operation fails or HC error is detected, re-initialize the HC during resume */
+	if ((temp & (STS_SRE | STS_HCE)) || hibernated) {
+		xhci_warn(xhci, "re-initialize HC during resume, USBSTS:%s\n",
+			  xhci_decode_usbsts(str, temp));
 
 		if ((xhci->quirks & XHCI_COMP_MODE_QUIRK) &&
 				!(xhci_all_ports_seen_u0(xhci))) {
-- 
2.35.0.rc2.247.g8bbb082509-goog