linux-kernel - Re: [PATCH v7 06/16] PCI: imx6: Simplify ltssm_enable() by using ltssm_off and ltssm

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Message-ID: <20240107032456.GE3416@thinkpad>
Date: Sun, 7 Jan 2024 08:54:56 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Frank Li <Frank.Li@....com>
Cc: krzysztof.kozlowski@...aro.org, bhelgaas@...gle.com,
	conor+dt@...nel.org, devicetree@...r.kernel.org, festevam@...il.com,
	helgaas@...nel.org, hongxing.zhu@....com, imx@...ts.linux.dev,
	kernel@...gutronix.de, krzysztof.kozlowski+dt@...aro.org,
	kw@...ux.com, l.stach@...gutronix.de,
	linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	lpieralisi@...nel.org, robh@...nel.org, s.hauer@...gutronix.de,
	shawnguo@...nel.org
Subject: Re: [PATCH v7 06/16] PCI: imx6: Simplify ltssm_enable() by using
 ltssm_off and ltssm_mask

On Wed, Dec 27, 2023 at 01:27:17PM -0500, Frank Li wrote:
> Add drvdata::ltssm_off and drvdata::ltssm_mask to simple
> imx6_pcie_ltssm_enable(disable)() logic.
> 
> Signed-off-by: Frank Li <Frank.Li@....com>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

- Mani

> ---
> 
> Notes:
>     Change from v1 to v3
>     - none
> 
>  drivers/pci/controller/dwc/pci-imx6.c | 37 ++++++++++++---------------
>  1 file changed, 16 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 332c392f8e5bc..588bfb616260e 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -75,6 +75,8 @@ struct imx6_pcie_drvdata {
>  	int dbi_length;
>  	const char *gpr;
>  	const char *clk_names[IMX6_PCIE_MAX_CLKS];
> +	const u32 ltssm_off;
> +	const u32 ltssm_mask;
>  };
>  
>  struct imx6_pcie {
> @@ -775,18 +777,11 @@ static int imx6_pcie_wait_for_speed_change(struct imx6_pcie *imx6_pcie)
>  static void imx6_pcie_ltssm_enable(struct device *dev)
>  {
>  	struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
> +	const struct imx6_pcie_drvdata *drvdata = imx6_pcie->drvdata;
>  
> -	switch (imx6_pcie->drvdata->variant) {
> -	case IMX6Q:
> -	case IMX6SX:
> -	case IMX6QP:
> -		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> -				   IMX6Q_GPR12_PCIE_CTL_2,
> -				   IMX6Q_GPR12_PCIE_CTL_2);
> -		break;
> -	default:
> -		break;
> -	}
> +	if (drvdata->ltssm_mask)
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, drvdata->ltssm_off, drvdata->ltssm_mask,
> +				   drvdata->ltssm_mask);
>  
>  	reset_control_deassert(imx6_pcie->apps_reset);
>  }
> @@ -794,17 +789,11 @@ static void imx6_pcie_ltssm_enable(struct device *dev)
>  static void imx6_pcie_ltssm_disable(struct device *dev)
>  {
>  	struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
> +	const struct imx6_pcie_drvdata *drvdata = imx6_pcie->drvdata;
>  
> -	switch (imx6_pcie->drvdata->variant) {
> -	case IMX6Q:
> -	case IMX6SX:
> -	case IMX6QP:
> -		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> -				   IMX6Q_GPR12_PCIE_CTL_2, 0);
> -		break;
> -	default:
> -		break;
> -	}
> +	if (drvdata->ltssm_mask)
> +		regmap_update_bits(imx6_pcie->iomuxc_gpr, drvdata->ltssm_off,
> +				   drvdata->ltssm_mask, 0);
>  
>  	reset_control_assert(imx6_pcie->apps_reset);
>  }
> @@ -1385,6 +1374,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
>  		.dbi_length = 0x200,
>  		.gpr = "fsl,imx6q-iomuxc-gpr",
>  		.clk_names = {"pcie_bus", "pcie", "pcie_phy"},
> +		.ltssm_off = IOMUXC_GPR12,
> +		.ltssm_mask = IMX6Q_GPR12_PCIE_CTL_2,
>  	},
>  	[IMX6SX] = {
>  		.variant = IMX6SX,
> @@ -1393,6 +1384,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
>  			 IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
>  		.gpr = "fsl,imx6q-iomuxc-gpr",
>  		.clk_names = {"pcie_bus", "pcie", "pcie_phy", "pcie_inbound_axi"},
> +		.ltssm_off = IOMUXC_GPR12,
> +		.ltssm_mask = IMX6Q_GPR12_PCIE_CTL_2,
>  	},
>  	[IMX6QP] = {
>  		.variant = IMX6QP,
> @@ -1402,6 +1395,8 @@ static const struct imx6_pcie_drvdata drvdata[] = {
>  		.dbi_length = 0x200,
>  		.gpr = "fsl,imx6q-iomuxc-gpr",
>  		.clk_names = {"pcie_bus", "pcie", "pcie_phy"},
> +		.ltssm_off = IOMUXC_GPR12,
> +		.ltssm_mask = IMX6Q_GPR12_PCIE_CTL_2,
>  	},
>  	[IMX7D] = {
>  		.variant = IMX7D,
> -- 
> 2.34.1
> 

-- 
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