linux-kernel - [PATCH 2/5] xhci: host: Use 200ms autosuspend delay for runtime suspend

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Message-Id: <20230325165217.31069-3-manivannan.sadhasivam@linaro.org>
Date:   Sat, 25 Mar 2023 22:22:14 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     andersson@...nel.org, Thinh.Nguyen@...opsys.com,
        gregkh@...uxfoundation.org, mathias.nyman@...el.com
Cc:     konrad.dybcio@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH 2/5] xhci: host: Use 200ms autosuspend delay for runtime suspend

On the Qcom platforms making use of DWC3 IP, xhci IRQs are received after
some delay while resuming from runtime suspend. Due to this, the xhci
driver once resumed, quickly goes into runtime suspend mode again, thus
deferring the usb enumeration.

So let's add a 200ms autosuspend delay to the xhci driver so that it get's
enough time to catch the IRQs.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/usb/host/xhci-plat.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index b9f9625467d6..f09510d3effe 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -173,6 +173,8 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s
 		return ret;
 
 	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 200);
+	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 	pm_runtime_get_noresume(&pdev->dev);
 
-- 
2.25.1