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42 lines
1.5 KiB
Diff
42 lines
1.5 KiB
Diff
From dd3d8c2c0b77eb742b288cf83e4849f87c8db5c6 Mon Sep 17 00:00:00 2001
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From: Khem Raj <raj.khem@gmail.com>
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Date: Tue, 7 Mar 2023 21:19:36 -0800
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Subject: [PATCH 3/4] PCI: imx: Use the external clock as REF_CLK when needed
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for i.MX8MQ
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Do not use the external clock when the internal PLL is used as PCIe
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REF_CLK.
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Signed-off-by: Ryosuke Saito <rsaito@redhat.com>
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Signed-off-by: Khem Raj <raj.khem@gmail.com>
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---
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drivers/pci/controller/dwc/pci-imx6.c | 15 +++++++-----
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1 file changed, 7 insertions(+), 5 deletions(-)
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diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
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index 3a8350cad812..841af6f55c7d 100644
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--- a/drivers/pci/controller/dwc/pci-imx6.c
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+++ b/drivers/pci/controller/dwc/pci-imx6.c
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@@ -370,11 +370,13 @@ static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
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static int imx8mq_pcie_init_phy(struct imx_pcie *imx_pcie)
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{
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- /* TODO: Currently this code assumes external oscillator is being used */
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- regmap_update_bits(imx_pcie->iomuxc_gpr,
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- imx_pcie_grp_offset(imx_pcie),
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- IMX8MQ_GPR_PCIE_REF_USE_PAD,
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- IMX8MQ_GPR_PCIE_REF_USE_PAD);
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+ if (imx_pcie->ext_osc) {
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+ /* Use the external oscillator as REF clock */
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+ regmap_update_bits(imx_pcie->iomuxc_gpr,
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+ imx_pcie_grp_offset(imx_pcie),
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+ IMX8MQ_GPR_PCIE_REF_USE_PAD,
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+ IMX8MQ_GPR_PCIE_REF_USE_PAD);
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+ }
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/*
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* Regarding the datasheet, the PCIE_VPH is suggested to be 1.8V. If the PCIE_VPH is
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* supplied by 3.3V, the VREG_BYPASS should be cleared to zero.
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--
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2.39.2
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