linux-kernel - [PATCH v4 2/9] PCI: dw-rockchip: Support get

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Message-Id: <20251029-rockchip-pcie-system-suspend-v4-2-ce2e1b0692d2@collabora.com>
Date: Wed, 29 Oct 2025 18:56:41 +0100
From: Sebastian Reichel <sebastian.reichel@...labora.com>
To: Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kwilczynski@...nel.org>, 
 Manivannan Sadhasivam <mani@...nel.org>, Rob Herring <robh@...nel.org>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, Heiko Stuebner <heiko@...ech.de>, 
 Philipp Zabel <p.zabel@...gutronix.de>, Jingoo Han <jingoohan1@...il.com>, 
 Shawn Lin <shawn.lin@...k-chips.com>
Cc: linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 kernel@...labora.com, Sebastian Reichel <sebastian.reichel@...labora.com>
Subject: [PATCH v4 2/9] PCI: dw-rockchip: Support get_ltssm operation

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 <sebastian.reichel@...labora.com>
---
 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)

-- 
2.51.0