linux-kernel - [PATCH] usb: xhci: Increase timeout for HC halt

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Message-Id: <20210511002933.1612871-1-luzmaximilian@gmail.com>
Date:   Tue, 11 May 2021 02:29:33 +0200
From:   Maximilian Luz <luzmaximilian@...il.com>
To:     Mathias Nyman <mathias.nyman@...el.com>
Cc:     Maximilian Luz <luzmaximilian@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] usb: xhci: Increase timeout for HC halt

On some devices (specifically the SC8180x based Surface Pro X with
QCOM04A6) HC halt / xhci_halt() times out during boot. Manually binding
the xhci-hcd driver at some point later does not exhibit this behavior.
To work around this, double XHCI_MAX_HALT_USEC, which also resolves this
issue.

Signed-off-by: Maximilian Luz <luzmaximilian@...il.com>
---
 drivers/usb/host/xhci-ext-caps.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/xhci-ext-caps.h b/drivers/usb/host/xhci-ext-caps.h
index fa59b242cd51..fb591e41cd50 100644
--- a/drivers/usb/host/xhci-ext-caps.h
+++ b/drivers/usb/host/xhci-ext-caps.h
@@ -7,8 +7,8 @@
  * Author: Sarah Sharp
  * Some code borrowed from the Linux EHCI driver.
  */
-/* Up to 16 ms to halt an HC */
-#define XHCI_MAX_HALT_USEC	(16*1000)
+/* Up to 32 ms to halt an HC */
+#define XHCI_MAX_HALT_USEC	(32 * 1000)
 /* HC not running - set to 1 when run/stop bit is cleared. */
 #define XHCI_STS_HALT		(1<<0)
 
-- 
2.31.1