[PATCH 2/2] PCI: mediatek: handle optional reset for perstout for AN7583
From: Christian Marangi <ansuelsmth@gmail.com>
Date: 2026-07-08 09:05:57
Also in:
linux-devicetree, linux-mediatek, linux-pci, lkml
Subsystem:
pci native host bridge and endpoint drivers, pci subsystem, pcie driver for mediatek, the rest · Maintainers:
Lorenzo Pieralisi, Krzysztof Wilczyński, Manivannan Sadhasivam, Bjorn Helgaas, Ryder Lee, Linus Torvalds
The Airoha AN7583 provide the perstout via a dedicated reset line as using the PCIe register is not possible as it will cause glitch. Add support for it via the additional reset name pcie-perstout[slot] and assert/deassert on an7583 specific startup. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com> --- drivers/pci/controller/pcie-mediatek.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index 8b57c3d75b94..3d4de9d69407 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c@@ -175,6 +175,7 @@ struct mtk_pcie_soc { * @phys_base: Physical address of the I/O register base region * @list: port list * @pcie: pointer to PCIe host info + * @perstout_reset: pointer to port perstout reset control * @reset: pointer to port reset control * @sys_ck: pointer to transaction/data link layer clock * @ahb_ck: pointer to AHB slave interface operating clock for CSR access
@@ -198,6 +199,7 @@ struct mtk_pcie_port { struct list_head list; struct mtk_pcie *pcie; struct reset_control *reset; + struct reset_control *perstout_reset; struct clk *sys_ck; struct clk *ahb_ck; struct clk *axi_ck;
@@ -865,6 +867,9 @@ static int mtk_pcie_startup_port_an7583(struct mtk_pcie_port *port) size = lower_32_bits(resource_size(entry->res)); regmap_write(pbus_regmap, args[1], GENMASK(31, __fls(size))); + reset_control_assert(port->perstout_reset); + reset_control_deassert(port->perstout_reset); + return mtk_pcie_startup_port_v2(port); }
@@ -1020,6 +1025,11 @@ static int mtk_pcie_parse_port(struct mtk_pcie *pcie, if (PTR_ERR(port->reset) == -EPROBE_DEFER) return PTR_ERR(port->reset); + snprintf(name, sizeof(name), "pcie-perstout%d", slot); + port->perstout_reset = devm_reset_control_get_optional_exclusive(dev, name); + if (PTR_ERR(port->perstout_reset) == -EPROBE_DEFER) + return PTR_ERR(port->perstout_reset); + /* some platforms may use default PHY setting */ snprintf(name, sizeof(name), "pcie-phy%d", slot); port->phy = devm_phy_optional_get(dev, name);
--
2.53.0