linux-kernel - [PATCH 3.19.y-ckt 47/99] usb: host: xhci-rcar: Avoid long wait in xhci

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Date:	Thu,  7 Jul 2016 11:37:46 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 47/99] usb: host: xhci-rcar: Avoid long wait in xhci_reset()

3.19.8-ckt23 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>

commit f879fc32aa0c96fbac261b3d857a1239d554ad01 upstream.

The firmware of R-Car USB 3.0 host controller will control the reset.
So, if the xhci driver doesn't do firmware downloading (e.g. kernel
configuration is CONFIG_USB_XHCI_PLATFORM=y and CONFIG_USB_XHCI_RCAR
is not set), the reset of USB 3.0 host controller doesn't work
correctly. Then, the host controller will cause long wait in
xhci_reset() because the CMD_RESET bit of op_regs->command is not
cleared for 10 seconds.

So, this patch modifies the Kconfig to enable both CONFIG_USB_XHCI_PLATFORM
and CONFIG_USB_XHCI_RCAR.

Fixes: 4ac8918f3a7 (usb: host: xhci-plat: add support for the R-Car H2 and M2 xHCI controllers)
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Reviewed-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[ kamal: backport to 4.2-stable: s/ARCH_RENESAS/ARCH_SHMOBILE/ ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/usb/host/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index c87e6e7..0321587 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -33,6 +33,7 @@ config USB_XHCI_PCI
 
 config USB_XHCI_PLATFORM
 	tristate
+	select USB_XHCI_RCAR if ARCH_SHMOBILE
 
 config USB_XHCI_MVEBU
 	tristate "xHCI support for Marvell Armada 375/38x"
@@ -44,7 +45,7 @@ config USB_XHCI_MVEBU
 
 config USB_XHCI_RCAR
 	tristate "xHCI support for Renesas R-Car SoCs"
-	select USB_XHCI_PLATFORM
+	depends on USB_XHCI_PLATFORM
 	depends on ARCH_SHMOBILE || COMPILE_TEST
 	---help---
 	  Say 'Y' to enable the support for the xHCI host controller
-- 
2.7.4