linux-kernel - [PATCH] PCI: dwc: Enable runtime pm of the host bridge

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Date: Mon, 19 Feb 2024 18:51:10 +0530
From: Krishna chaitanya chundru <quic_krichai@...cinc.com>
To: Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel
	<gustavo.pimentel@...opsys.com>,
        Manivannan Sadhasivam
	<manivannan.sadhasivam@...aro.org>,
        Lorenzo Pieralisi
	<lpieralisi@...nel.org>,
        Krzysztof Wilczyński
	<kw@...ux.com>,
        Rob Herring <robh@...nel.org>, Bjorn Helgaas
	<bhelgaas@...gle.com>
CC: <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <quic_vbadigan@...cinc.com>, <quic_ramkri@...cinc.com>,
        <quic_nitegupt@...cinc.com>, <quic_skananth@...cinc.com>,
        <quic_parass@...cinc.com>,
        Krishna chaitanya chundru
	<quic_krichai@...cinc.com>
Subject: [PATCH] PCI: dwc: Enable runtime pm of the host bridge

Currently controller driver goes to runtime suspend irrespective
of the child(pci-pci bridge & endpoint driver) runtime state.
This is because the runtime pm is not being enabled for the host
bridge dev which maintains parent child relationship.

So enable pm runtime for the host bridge, so that controller driver
goes to suspend only when all child devices goes to runtime suspend.

Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index d5fc31f8345f..57756a73df30 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -16,6 +16,7 @@
 #include <linux/of_pci.h>
 #include <linux/pci_regs.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 
 #include "../../pci.h"
 #include "pcie-designware.h"
@@ -505,6 +506,9 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)
 	if (pp->ops->post_init)
 		pp->ops->post_init(pp);
 
+	pm_runtime_set_active(&bridge->dev);
+	pm_runtime_enable(&bridge->dev);
+
 	return 0;
 
 err_stop_link:

---
base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d
change-id: 20240219-runtime_pm_enable-bdc17914bd50

Best regards,
-- 
Krishna chaitanya chundru <quic_krichai@...cinc.com>