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Message-id: <1464768141-25420-11-git-send-email-k.kozlowski@samsung.com>
Date: Wed, 01 Jun 2016 10:02:19 +0200
From: Krzysztof Kozlowski <k.kozlowski@...sung.com>
To: hzpeterchen@...il.com, Ulf Hansson <ulf.hansson@...aro.org>,
Sebastian Reichel <sre@...nel.org>,
Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
David Woodhouse <dwmw2@...radead.org>,
Krzysztof Kozlowski <k.kozlowski@...sung.com>,
Javier Martinez Canillas <javier@....samsung.com>,
linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
linux-pm@...r.kernel.or, Alan Stern <stern@...land.harvard.edu>,
linux-usb@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Kukjin Kim <kgene@...nel.org>, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: [PATCH v3 10/12] EXAMPLE CODE: usb: hub: Power sequence the ports on
activation
The autodetection of attached USB device might not work on certain
boards where the power is delivered externally. These devices also might
require a hard reset. Use pwrseq for that in USB hub.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
---
drivers/usb/core/hub.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index c421745b84aa..46d9f9aedacc 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -26,6 +26,7 @@
#include <linux/mutex.h>
#include <linux/random.h>
#include <linux/pm_qos.h>
+#include <linux/pwrseq.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
@@ -1663,6 +1664,15 @@ static int hub_configure(struct usb_hub *hub,
usb_hub_adjust_deviceremovable(hdev, hub->descriptor);
+ /* FIXME: When do the pre-power-on? */
+ /*
+ for (i = 0; i < maxchild; i++)
+ pwrseq_pre_power_on(hub->ports[i]->pwrseq);
+ */
+
+ for (i = 0; i < maxchild; i++)
+ pwrseq_post_power_on(hub->ports[i]->pwrseq);
+
hub_activate(hub, HUB_INIT);
return 0;
--
1.9.1
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