Port imx6_pcie_ltssm_enable() from Linux kernel driver.
Signed-off-by: Andrey Smirnov <[email protected]>
---
drivers/pci/pci-imx6.c | 27 ++++++++++++++++++---------
1 file changed, 18 insertions(+), 9 deletions(-)
diff --git a/drivers/pci/pci-imx6.c b/drivers/pci/pci-imx6.c
index 573888a33..ab67a552c 100644
--- a/drivers/pci/pci-imx6.c
+++ b/drivers/pci/pci-imx6.c
@@ -457,6 +457,23 @@ static int imx6_pcie_wait_for_speed_change(struct
imx6_pcie *imx6_pcie)
return -EINVAL;
}
+static void imx6_pcie_ltssm_enable(struct device_d *dev)
+{
+ struct imx6_pcie *imx6_pcie = dev->priv;
+ u32 gpr12;
+
+ switch (imx6_pcie->variant) {
+ case IMX6Q:
+ case IMX6QP:
+ gpr12 = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
+ gpr12 |= IMX6Q_GPR12_PCIE_CTL_2;
+ writel(gpr12, imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
+ break;
+ case IMX7D:
+ reset_control_deassert(imx6_pcie->apps_reset);
+ break;
+ }
+}
static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
{
@@ -464,7 +481,6 @@ static int imx6_pcie_establish_link(struct imx6_pcie
*imx6_pcie)
struct device_d *dev = pci->dev;
uint32_t tmp;
int ret;
- u32 gpr12;
/*
* Force Gen1 operation when starting the link. In case the link is
@@ -476,14 +492,7 @@ static int imx6_pcie_establish_link(struct imx6_pcie
*imx6_pcie)
tmp |= PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN1;
dw_pcie_writel_dbi(pci, PCIE_RC_LCR, tmp);
- /* Start LTSSM. */
- if (imx6_pcie->variant == IMX7D) {
- reset_control_deassert(imx6_pcie->apps_reset);
- } else {
- gpr12 = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
- gpr12 |= IMX6Q_GPR12_PCIE_CTL_2;
- writel(gpr12, imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
- }
+ imx6_pcie_ltssm_enable(dev);
ret = imx6_pcie_wait_for_link(imx6_pcie);
if (ret)
--
2.20.1
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