linux-kernel - [PATCH 5/5] misc: rtsx_usb: / memstick: rtsx_usb_ms: Avoid long delay before system suspend

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Date:   Tue, 31 Jul 2018 14:17:21 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     arnd@...db.de, gregkh@...uxfoundation.org
Cc:     ulf.hansson@...aro.org, stern@...land.harvard.edu,
        bauer.chen@...ltek.com, ricky_wu@...ltek.com,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>
Subject: [PATCH 5/5] misc: rtsx_usb: / memstick: rtsx_usb_ms: Avoid long delay before system suspend

There's a long power-on delay at the end of rtsx_usb_ms_set_param().
This delay is noticeable right before system suspend.

To prevent already suspended memstick host from getting powered on by PM
core, use DPM_FLAG_SMART_SUSPEND to avoid the situation.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 drivers/memstick/host/rtsx_usb_ms.c | 4 ++++
 drivers/misc/cardreader/rtsx_usb.c  | 1 +
 2 files changed, 5 insertions(+)

diff --git a/drivers/memstick/host/rtsx_usb_ms.c b/drivers/memstick/host/rtsx_usb_ms.c
index 126eb310980a..e3b635d1220f 100644
--- a/drivers/memstick/host/rtsx_usb_ms.c
+++ b/drivers/memstick/host/rtsx_usb_ms.c
@@ -763,6 +763,10 @@ static int rtsx_usb_ms_drv_probe(struct platform_device *pdev)
 	msh->set_param = rtsx_usb_ms_set_param;
 	msh->caps = MEMSTICK_CAP_PAR4;
 
+	/* DPM_FLAG_LEAVE_SUSPENDED is not needed, the parent device will wake
+	 * up memstick host.
+	 */
+	dev_pm_set_driver_flags(ms_dev(host), DPM_FLAG_SMART_SUSPEND);
 	pm_runtime_set_active(ms_dev(host));
 	pm_runtime_enable(ms_dev(host));
 
diff --git a/drivers/misc/cardreader/rtsx_usb.c b/drivers/misc/cardreader/rtsx_usb.c
index f7a66f614085..98bb878a6ade 100644
--- a/drivers/misc/cardreader/rtsx_usb.c
+++ b/drivers/misc/cardreader/rtsx_usb.c
@@ -671,6 +671,7 @@ static int rtsx_usb_probe(struct usb_interface *intf,
 		goto out_init_fail;
 
 #ifdef CONFIG_PM
+	dev_pm_set_driver_flags(&intf->dev, DPM_FLAG_SMART_SUSPEND | DPM_FLAG_LEAVE_SUSPENDED);
 	intf->needs_remote_wakeup = 1;
 	usb_enable_autosuspend(usb_dev);
 #endif
-- 
2.17.1