linux-kernel - [PATCH v3 01/11] PCI: Update current bus speed as part of pci_pwrctrl

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Message-Id: <20250519-mhi_bw_up-v3-1-3acd4a17bbb5@oss.qualcomm.com>
Date: Mon, 19 May 2025 15:12:14 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Johannes Berg <johannes@...solutions.net>,
        Jeff Johnson <jjohnson@...nel.org>,
        Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, mhi@...ts.linux.dev,
        linux-wireless@...r.kernel.org, ath11k@...ts.infradead.org,
        qiang.yu@....qualcomm.com, quic_vbadigan@...cinc.com,
        quic_vpernami@...cinc.com, quic_mrana@...cinc.com,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
        Jeff Johnson <jeff.johnson@....qualcomm.com>
Subject: [PATCH v3 01/11] PCI: Update current bus speed as part of
 pci_pwrctrl_notify()

If the link is not up till the pwrctl drivers enable power to endpoints
then cur_bus_speed will not be updated with correct speed.

As part of rescan, pci_pwrctrl_notify() will be called when new devices
are added and as part of it update the link bus speed.

Suggested-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
---
 drivers/pci/pwrctrl/core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pci/pwrctrl/core.c b/drivers/pci/pwrctrl/core.c
index 9cc7e2b7f2b5608ee67c838b6500b2ae4a07ad52..034f0a5d7868fe956e3fc6a9b7ed485bb69caa04 100644
--- a/drivers/pci/pwrctrl/core.c
+++ b/drivers/pci/pwrctrl/core.c
@@ -10,16 +10,21 @@
 #include <linux/pci-pwrctrl.h>
 #include <linux/property.h>
 #include <linux/slab.h>
+#include "../pci.h"
 
 static int pci_pwrctrl_notify(struct notifier_block *nb, unsigned long action,
 			      void *data)
 {
 	struct pci_pwrctrl *pwrctrl = container_of(nb, struct pci_pwrctrl, nb);
 	struct device *dev = data;
+	struct pci_bus *bus = to_pci_dev(dev)->bus;
 
 	if (dev_fwnode(dev) != dev_fwnode(pwrctrl->dev))
 		return NOTIFY_DONE;
 
+	if (bus->self)
+		pcie_update_link_speed((struct pci_bus *)bus);
+
 	switch (action) {
 	case BUS_NOTIFY_ADD_DEVICE:
 		/*

-- 
2.34.1