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PCI: rockchip: dw: Add present IO detect

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prsnt-gpios can be defined in DTS for showing if PCIe device is present
or not. By default, low voltage means device is present defined by PCIe
ECM spec. However, some buggy board may invert this voltage level. So
if you need high voltage to show the device is present, please add
rockchip,prsnt-active-high as well.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Change-Id: Ib0a5b509afc202a9ec63a4bbdd1e54a3916dcfc9
This commit is contained in:
Shawn Lin
2022-01-21 15:44:25 +08:00
committed by Tao Huang
parent 65e1c00702
commit cca1a93b9e
1 changed files with 16 additions and 0 deletions
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16
drivers/pci/controller/dwc/pcie-dw-rockchip.c
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@@ -147,6 +147,8 @@ struct rk_pcie {
unsigned int clk_cnt;
struct reset_bulk_data *rsts;
struct gpio_desc *rst_gpio;
struct gpio_desc *prsnt_gpio;
int prsnt_active_stat;
phys_addr_t mem_start;
size_t mem_size;
struct pcie_port pp;
@@ -1179,6 +1181,13 @@ static int rk_pcie_resource_get(struct platform_device *pdev,
return PTR_ERR(rk_pcie->rst_gpio);
}
rk_pcie->prsnt_gpio = devm_gpiod_get_optional(&pdev->dev, "prsnt", GPIOD_IN);
if (IS_ERR_OR_NULL(rk_pcie->prsnt_gpio))
dev_info(&pdev->dev, "invalid prsnt-gpios property in node\n");
if (device_property_read_bool(&pdev->dev, "rockchip,prsnt-active-high"))
rk_pcie->prsnt_active_stat = 1;
return 0;
}
@@ -1752,6 +1761,13 @@ static int rk_pcie_really_probe(void *p)
goto release_driver;
}
if (!IS_ERR_OR_NULL(rk_pcie->prsnt_gpio)) {
if (gpiod_get_value(rk_pcie->prsnt_gpio) != rk_pcie->prsnt_active_stat) {
ret = -ENODEV;
goto release_driver;
}
}
retry_regulator:
/* DON'T MOVE ME: must be enable before phy init */
rk_pcie->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");