linux-kernel - [PATCH v2 01/10] PCI: update current bus speed as part of pci_bus_add

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Message-Id: <20250313-mhi_bw_up-v2-1-869ca32170bf@oss.qualcomm.com>
Date: Thu, 13 Mar 2025 17:10:08 +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>
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,
        quic_pyarlaga@...cinc.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 v2 01/10] PCI: update current bus speed as part of
 pci_bus_add_devices()

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_bus_add_devices() will be called and as part of
it update the link bus speed.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
---
 drivers/pci/bus.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 98910bc0fcc4..994879071d4c 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -432,6 +432,9 @@ void pci_bus_add_devices(const struct pci_bus *bus)
 	struct pci_dev *dev;
 	struct pci_bus *child;
 
+	if (bus->self)
+		pcie_update_link_speed((struct pci_bus *)bus);
+
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		/* Skip already-added devices */
 		if (pci_dev_is_added(dev))

-- 
2.34.1