[PATCH] usb: dwc3: Add shutdown to platform_driver

From: Vicente Bergas <vicencb@gmail.com>
To: Felipe Balbi <balbi@kernel.org>, Robin Murphy <robin.murphy@arm.com>
Cc: Matthias Brugger <mbrugger@suse.com>,
	Heiko Stuebner <heiko@sntech.de>,
	MarcZyngier <marc.zyngier@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	linux-usb@vger.kernel.org, Will Deacon <will.deacon@arm.com>,
	Vicente Bergas <vicencb@gmail.com>,
	linux-rockchip@lists.infradead.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH] usb: dwc3: Add shutdown to platform_driver
Date: Sat, 17 Aug 2019 19:41:40 +0200	[thread overview]
Message-ID: <20190817174140.6394-1-vicencb@gmail.com> (raw)
In-Reply-To: <4d18d4f7-a00e-bd60-6361-51054eba3bca@arm.com>

Otherwise the device keeps writing to memory after kexec and disturbs
the next kernel.

Signed-off-by: Vicente Bergas <vicencb@gmail.com>
---
 drivers/usb/dwc3/dwc3-of-simple.c | 6 ++++++
 1 file changed, 6 insertions(+)

Hi Felipe, Robin,
this version calls 'remove' from 'shutdown' instead of just asserting
a reset because it looks like a cleaner way to stop the device.

Calling remove from shutdown in core.c instead of dwc3-of-simple.c does not
fix the issue either.

It has been tested on the sapphire board, a RK3399 platform.

Regards,
  Vicenç.

diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c
index bdac3e7d7b18..d5fd45c64901 100644
--- a/drivers/usb/dwc3/dwc3-of-simple.c
+++ b/drivers/usb/dwc3/dwc3-of-simple.c
@@ -133,6 +133,11 @@ static int dwc3_of_simple_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static void dwc3_of_simple_shutdown(struct platform_device *pdev)
+{
+	dwc3_of_simple_remove(pdev);
+}
+
 static int __maybe_unused dwc3_of_simple_runtime_suspend(struct device *dev)
 {
 	struct dwc3_of_simple	*simple = dev_get_drvdata(dev);
@@ -190,6 +195,7 @@ MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);
 static struct platform_driver dwc3_of_simple_driver = {
 	.probe		= dwc3_of_simple_probe,
 	.remove		= dwc3_of_simple_remove,
+	.shutdown	= dwc3_of_simple_shutdown,
 	.driver		= {
 		.name	= "dwc3-of-simple",
 		.of_match_table = of_dwc3_simple_match,
-- 
2.22.1


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