linux-kernel - [PATCH v5] usb: xhci: plat: Facilitate using autosuspend for xhci plat devices

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Message-Id: <20250916120436.3617598-1-krishna.kurapati@oss.qualcomm.com>
Date: Tue, 16 Sep 2025 17:34:36 +0530
From: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
To: Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Krishna Kurapati <krishna.kurapati@....qualcomm.com>
Subject: [PATCH v5] usb: xhci: plat: Facilitate using autosuspend for xhci plat devices

Allow autosuspend to be used by xhci plat device. For Qualcomm SoCs,
when in host mode, it is intended that the controller goes to suspend
state to save power and wait for interrupts from connected peripheral
to wake it up. This is particularly used in cases where a HID or Audio
device is connected. In such scenarios, the usb controller can enter
auto suspend and resume action after getting interrupts from the
connected device.

Signed-off-by: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
---
Changes in v5:
Rebased on top of latest usb-next.
The first two patches in v4 have been sent separately and merged.
Sending the third patch independently now.

Link to v4:
https://lore.kernel.org/all/20250812055542.1588528-4-krishna.kurapati@oss.qualcomm.com/

 drivers/usb/host/xhci-plat.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 5eb51797de32..dd57ffedcaa2 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -171,6 +171,7 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s
 		return ret;
 
 	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 	pm_runtime_get_noresume(&pdev->dev);
 
-- 
2.34.1