mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-15 06:55:13 +08:00
PCI: imx6: Factor out ref clock enable
Factor out ref clock enable to make it cleaner to add imx6sx support. No functional change intended. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Tested-by: Christoph Fritz <chf.fritz@googlemail.com>
This commit is contained in:
parent
b2d7a9cd3f
commit
4d1821e729
@ -269,6 +269,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
|
||||
{
|
||||
/* power up core phy and enable ref clock */
|
||||
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
|
||||
IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
|
||||
/*
|
||||
* the async reset input need ref clock to sync internally,
|
||||
* when the ref clock comes after reset, internal synced
|
||||
* reset time is too short, cannot meet the requirement.
|
||||
* add one ~10us delay here.
|
||||
*/
|
||||
udelay(10);
|
||||
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
|
||||
IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
|
||||
{
|
||||
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
|
||||
@ -292,18 +309,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
|
||||
goto err_pcie;
|
||||
}
|
||||
|
||||
/* power up core phy and enable ref clock */
|
||||
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
|
||||
IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
|
||||
/*
|
||||
* the async reset input need ref clock to sync internally,
|
||||
* when the ref clock comes after reset, internal synced
|
||||
* reset time is too short, cannot meet the requirement.
|
||||
* add one ~10us delay here.
|
||||
*/
|
||||
udelay(10);
|
||||
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
|
||||
IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
|
||||
ret = imx6_pcie_enable_ref_clk(imx6_pcie);
|
||||
if (ret) {
|
||||
dev_err(pp->dev, "unable to enable pcie ref clock\n");
|
||||
goto err_ref_clk;
|
||||
}
|
||||
|
||||
/* allow the clocks to stabilize */
|
||||
usleep_range(200, 500);
|
||||
@ -316,6 +326,8 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
|
||||
}
|
||||
return 0;
|
||||
|
||||
err_ref_clk:
|
||||
clk_disable_unprepare(imx6_pcie->pcie);
|
||||
err_pcie:
|
||||
clk_disable_unprepare(imx6_pcie->pcie_bus);
|
||||
err_pcie_bus:
|
||||
|
Loading…
Reference in New Issue
Block a user