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From: Nicolas Ferre <nicolas.ferre@microchip•com>
To: <linux-kernel@vger•kernel.org>,
	<linux-arm-kernel@lists•infradead.org>,
	<stern@rowland•harvard.edu>, <gregkh@linuxfoundation•org>
Cc: Boris.Krasnovskiy@lairdconnect•com,
	Alexandre Belloni <alexandre.belloni@bootlin•com>,
	linux-usb@vger•kernel.org,
	Ludovic Desroches <ludovic.desroches@microchip•com>
Subject: [PATCH 1/3] USB: host: ohci-at91: completely shutdown the controller in at91_stop_hc()
Date: Wed, 11 Sep 2019 08:41:52 +0200	[thread overview]
Message-ID: <20190911064154.28633-2-nicolas.ferre@microchip.com> (raw)
In-Reply-To: <20190911064154.28633-1-nicolas.ferre@microchip.com>

From: Boris Krasnovskiy <Boris.Krasnovskiy@lairdconnect•com>

When removing the ohci-at91 module, the fact of not running complete shutdown
of all the ports was keeping additional analog cells consuming power for no
reason.
Doing Reset (OHCI_HCR) to HcCommandStatus register is the way to go, but using
the OHCI controller shutdown procedure is just perfect for this.

Signed-off-by: Boris Krasnovskiy <Boris.Krasnovskiy@lairdconnect•com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip•com>
---
 drivers/usb/host/ohci-at91.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index fc35a7993b7b..cb63bcd5049a 100644
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -123,7 +123,7 @@ static void at91_stop_hc(struct platform_device *pdev)
 	/*
 	 * Put the USB host controller into reset.
 	 */
-	writel(0, &regs->control);
+	usb_hcd_platform_shutdown(pdev);
 
 	/*
 	 * Stop the USB clocks.
-- 
2.17.1


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  reply	other threads:[~2019-09-11  6:43 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-11  6:41 [PATCH 0/3] USB: host: ohci-at91: tailor power consumption Nicolas Ferre
2019-09-11  6:41 ` Nicolas Ferre [this message]
2019-09-11  6:41 ` [PATCH 2/3] USB: host: ohci-at91: suspend: delay needed before to stop clocks Nicolas Ferre
2019-09-11  6:41 ` [PATCH 3/3] USB: host: ohci-at91: resume: balance the clock start call Nicolas Ferre
2019-09-11 15:09 ` [PATCH 0/3] USB: host: ohci-at91: tailor power consumption Alan Stern

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