From: Kai-Heng Feng <kai.heng.feng@canonical.com>
To: arnd@arndb.de, gregkh@linuxfoundation.org
Cc: ulf.hansson@linaro.org, stern@rowland.harvard.edu,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
Kai-Heng Feng <kai.heng.feng@canonical.com>
Subject: [PATCH 1/4 v6] misc: rtsx_usb: Use USB remote wakeup signaling for card insertion detection
Date: Wed, 31 Oct 2018 14:59:00 +0800 [thread overview]
Message-ID: <20181031065903.6209-2-kai.heng.feng@canonical.com> (raw)
In-Reply-To: <20181031065903.6209-1-kai.heng.feng@canonical.com>
Although rtsx_usb doesn't support card removal detection, card insertion
will resume rtsx_usb by USB remote wakeup signaling.
When rtsx_usb gets resumed, also resumes its child devices,
rtsx_usb_sdmmc and rtsx_usb_ms, to notify them there's a card in its
slot.
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
drivers/misc/cardreader/rtsx_usb.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/misc/cardreader/rtsx_usb.c b/drivers/misc/cardreader/rtsx_usb.c
index b97903ff1a72..f7a66f614085 100644
--- a/drivers/misc/cardreader/rtsx_usb.c
+++ b/drivers/misc/cardreader/rtsx_usb.c
@@ -723,8 +723,15 @@ static int rtsx_usb_suspend(struct usb_interface *intf, pm_message_t message)
return 0;
}
+static int rtsx_usb_resume_child(struct device *dev, void *data)
+{
+ pm_request_resume(dev);
+ return 0;
+}
+
static int rtsx_usb_resume(struct usb_interface *intf)
{
+ device_for_each_child(&intf->dev, NULL, rtsx_usb_resume_child);
return 0;
}
@@ -734,6 +741,7 @@ static int rtsx_usb_reset_resume(struct usb_interface *intf)
(struct rtsx_ucr *)usb_get_intfdata(intf);
rtsx_usb_reset_chip(ucr);
+ device_for_each_child(&intf->dev, NULL, rtsx_usb_resume_child);
return 0;
}
--
2.17.1
next prev parent reply other threads:[~2018-10-31 6:59 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-31 6:58 [PATCH 0/4 v6] Keep rtsx_usb suspended when there's no card Kai-Heng Feng
2018-10-31 6:59 ` Kai-Heng Feng [this message]
2018-10-31 6:59 ` [PATCH 2/4 v6] memstick: Prevent memstick host from getting runtime suspended during card detection Kai-Heng Feng
2018-10-31 6:59 ` [PATCH 3/4 v6] memstick: rtsx_usb_ms: Use ms_dev() helper Kai-Heng Feng
2018-10-31 6:59 ` [PATCH 4/4 v6] memstick: rtsx_usb_ms: Support runtime power management Kai-Heng Feng
2018-10-31 10:40 ` Ulf Hansson
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