[PATCH v4 2/9] PCI: dw-rockchip: Support get_ltssm operation
From: Sebastian Reichel <hidden>
Date: 2025-10-29 17:57:04
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
Implement .get_ltssm operation function pointer, which will be needed for system suspend support. As the driver used to have a function called rockchip_pcie_get_ltssm() with different behavior the new function is named rockchip_pcie_get_ltssm_state(), so that issues can easily be detected when porting patches. Signed-off-by: Sebastian Reichel <redacted> --- drivers/pci/controller/dwc/pcie-dw-rockchip.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
index 58427db1cc65..e3d7792f7819 100644
--- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
+++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c@@ -180,6 +180,14 @@ static u32 rockchip_pcie_get_ltssm_status_reg(struct rockchip_pcie *rockchip) return rockchip_pcie_readl_apb(rockchip, PCIE_CLIENT_LTSSM_STATUS); } +static u32 rockchip_pcie_get_ltssm_state(struct dw_pcie *pci) +{ + struct rockchip_pcie *rockchip = to_rockchip_pcie(pci); + u32 val = rockchip_pcie_get_ltssm_status_reg(rockchip); + + return FIELD_GET(PCIE_LTSSM_STATUS_MASK, val); +} + static void rockchip_pcie_enable_ltssm(struct rockchip_pcie *rockchip) { rockchip_pcie_writel_apb(rockchip, PCIE_CLIENT_ENABLE_LTSSM,
@@ -446,6 +454,7 @@ static const struct dw_pcie_ops dw_pcie_ops = { .link_up = rockchip_pcie_link_up, .start_link = rockchip_pcie_start_link, .stop_link = rockchip_pcie_stop_link, + .get_ltssm = rockchip_pcie_get_ltssm_state, }; static irqreturn_t rockchip_pcie_rc_sys_irq_thread(int irq, void *arg)
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2.51.0