linux-kernel - [PATCH v8 4/8] PCI: imx6: Disable iMX6QDL PCIe REF clock when disable PCIe clocks

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Date:   Fri, 25 Feb 2022 11:44:23 +0800
From:   Richard Zhu <hongxing.zhu@....com>
To:     l.stach@...gutronix.de, bhelgaas@...gle.com, broonie@...nel.org,
        lorenzo.pieralisi@....com, jingoohan1@...il.com,
        festevam@...il.com, francesco.dolcini@...adex.com
Cc:     hongxing.zhu@....com, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, linux-imx@....com
Subject: [PATCH v8 4/8] PCI: imx6: Disable iMX6QDL PCIe REF clock when disable PCIe clocks

When disable PCIe clocks, disable i.MX6QDL PCIe REF clock too.

Signed-off-by: Richard Zhu <hongxing.zhu@....com>
---
 drivers/pci/controller/dwc/pci-imx6.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 99fc22d1d55e..0f1b8c873a4a 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -540,6 +540,14 @@ static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
 	clk_disable_unprepare(imx6_pcie->pcie_bus);
 
 	switch (imx6_pcie->drvdata->variant) {
+	case IMX6Q:
+	case IMX6QP:
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+				IMX6Q_GPR1_PCIE_REF_CLK_EN, 0);
+		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+				IMX6Q_GPR1_PCIE_TEST_PD,
+				IMX6Q_GPR1_PCIE_TEST_PD);
+		break;
 	case IMX6SX:
 		clk_disable_unprepare(imx6_pcie->pcie_inbound_axi);
 		break;
-- 
2.25.1