linux-kernel - [PATCH v7 06/10] PCI: imx6: Fix the missing reference clock disable logic

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Message-Id: <20241126075702.4099164-7-hongxing.zhu@nxp.com>
Date: Tue, 26 Nov 2024 15:56:58 +0800
From: Richard Zhu <hongxing.zhu@....com>
To: l.stach@...gutronix.de,
	bhelgaas@...gle.com,
	lpieralisi@...nel.org,
	kw@...ux.com,
	manivannan.sadhasivam@...aro.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	shawnguo@...nel.org,
	frank.li@....com,
	s.hauer@...gutronix.de,
	festevam@...il.com
Cc: imx@...ts.linux.dev,
	kernel@...gutronix.de,
	linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Richard Zhu <hongxing.zhu@....com>,
	Frank Li <Frank.Li@....com>
Subject: [PATCH v7 06/10] PCI: imx6: Fix the missing reference clock disable logic

Ensure the *_enable_ref_clk() function is symmetric by addressing missing
disable parts on some platforms.

Fixes: d0a75c791f98 ("PCI: imx6: Factor out ref clock disable to match enable")
Signed-off-by: Richard Zhu <hongxing.zhu@....com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Reviewed-by: Frank Li <Frank.Li@....com>
---
 drivers/pci/controller/dwc/pci-imx6.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 413db182ce9f..ab2c97a8c327 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -599,10 +599,9 @@ static int imx_pcie_attach_pd(struct device *dev)
 
 static int imx6sx_pcie_enable_ref_clk(struct imx_pcie *imx_pcie, bool enable)
 {
-	if (enable)
-		regmap_clear_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12,
-				  IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
-
+	regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12,
+			   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
+			   enable ? 0 : IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
 	return 0;
 }
 
@@ -631,19 +630,20 @@ static int imx8mm_pcie_enable_ref_clk(struct imx_pcie *imx_pcie, bool enable)
 {
 	int offset = imx_pcie_grp_offset(imx_pcie);
 
-	if (enable) {
-		regmap_clear_bits(imx_pcie->iomuxc_gpr, offset, IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE);
-		regmap_set_bits(imx_pcie->iomuxc_gpr, offset, IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN);
-	}
-
+	regmap_update_bits(imx_pcie->iomuxc_gpr, offset,
+			   IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE,
+			   enable ? 0 : IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE);
+	regmap_update_bits(imx_pcie->iomuxc_gpr, offset,
+			   IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN,
+			   enable ? IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN : 0);
 	return 0;
 }
 
 static int imx7d_pcie_enable_ref_clk(struct imx_pcie *imx_pcie, bool enable)
 {
-	if (!enable)
-		regmap_set_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12,
-				IMX7D_GPR12_PCIE_PHY_REFCLK_SEL);
+	regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12,
+			   IMX7D_GPR12_PCIE_PHY_REFCLK_SEL,
+			   enable ? 0 : IMX7D_GPR12_PCIE_PHY_REFCLK_SEL);
 	return 0;
 }
 
-- 
2.37.1