[09/12,SRU,B,C,D,OEM-B] misc: rtsx_usb: Use USB remote wakeup signaling for card insertion detection

Message ID 20190111083019.32135-10-acelan.kao@canonical.com
State New
Headers show
  • To reduce the Realtek USB cardreader power consumption
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Commit Message

AceLan Kao Jan. 11, 2019, 8:30 a.m.
From: Kai-Heng Feng <kai.heng.feng@canonical.com>

BugLink: https://bugs.launchpad.net/bugs/1811337

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

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
(cherry picked from commit 883a87ddf2f118fbce617b1b3472b8224803eb14)
Signed-off-by: AceLan Kao <acelan.kao@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);
+	device_for_each_child(&intf->dev, NULL, rtsx_usb_resume_child);
 	return 0;