[PATCH v2] PCI: dw-rockchip: Add runtime PM support to Rockchip PCIe
From: Anand Moon <hidden>
Date: 2026-01-02 13:18:32
Also in:
linux-pci, linux-rockchip, lkml
Subsystem:
arm/rockchip soc support, pci native host bridge and endpoint drivers, pci subsystem, the rest · Maintainers:
Heiko Stuebner, Lorenzo Pieralisi, Krzysztof Wilczyński, Manivannan Sadhasivam, Bjorn Helgaas, Linus Torvalds
Add runtime powwe manageement functionality into the Rockchip DesignWare PCIe controller driver. Calling devm_pm_runtime_enable() during device probing allows the controller to report its runtime PM status, enabling power management controls to be applied consistently across the entire connected PCIe hierarchy. Signed-off-by: Anand Moon <redacted> --- v2: improve the commit message Drop the .remove patch Drop the disable_pm_runtime v1: https://lore.kernel.org/all/20251027145602.199154-3-linux.amoon@gmail.com/ (local) --- drivers/pci/controller/dwc/pcie-dw-rockchip.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
index f8605fe61a415..2498ff5146a5a 100644
--- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
+++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c@@ -20,6 +20,7 @@ #include <linux/of_irq.h> #include <linux/phy/phy.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/regmap.h> #include <linux/reset.h>
@@ -709,6 +710,20 @@ static int rockchip_pcie_probe(struct platform_device *pdev) if (ret) goto deinit_phy; + ret = pm_runtime_set_suspended(dev); + if (ret) + goto deinit_clk; + + ret = devm_pm_runtime_enable(dev); + if (ret) { + ret = dev_err_probe(dev, ret, "Failed to enable runtime PM\n"); + goto deinit_clk; + } + + ret = pm_runtime_resume_and_get(dev); + if (ret) + goto deinit_clk; + switch (data->mode) { case DW_PCIE_RC_TYPE: ret = rockchip_pcie_configure_rc(pdev, rockchip);
@@ -730,6 +745,8 @@ static int rockchip_pcie_probe(struct platform_device *pdev) deinit_clk: clk_bulk_disable_unprepare(rockchip->clk_cnt, rockchip->clks); + pm_runtime_disable(dev); + pm_runtime_no_callbacks(dev); deinit_phy: rockchip_pcie_phy_deinit(rockchip);
base-commit: b69053dd3ffbc0d2dedbbc86182cdef6f641fe1b -- 2.50.1