linux-kernel - Re: [PATCH v6 09/10] PCI: imx6: Call: Common PHY API to set mode, speed, and submode

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Message-ID: <20240630162337.GD5264@thinkpad>
Date: Sun, 30 Jun 2024 21:53:37 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Frank Li <Frank.Li@....com>
Cc: Richard Zhu <hongxing.zhu@....com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	NXP Linux Team <linux-imx@....com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-pci@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v6 09/10] PCI: imx6: Call: Common PHY API to set mode,
 speed, and submode

On Mon, Jun 17, 2024 at 04:16:45PM -0400, Frank Li wrote:

You don't need the colon after 'Call' in subject.

> Invoke the common PHY API to configure mode, speed, and submode. While
> these functions are optional in the PHY interface, they are necessary for
> certain PHY drivers. Lack of support for these functions in a PHY driver
> does not cause harm.
> 
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index ab0ed7ab3007a..18c133f5a56fc 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -30,6 +30,7 @@
>  #include <linux/interrupt.h>
>  #include <linux/reset.h>
>  #include <linux/phy/phy.h>
> +#include <linux/phy/pcie.h>

This should be moved one entry above.

>  #include <linux/pm_domain.h>
>  #include <linux/pm_runtime.h>
>  
> @@ -229,6 +230,10 @@ static void imx_pcie_configure_type(struct imx_pcie *imx_pcie)
>  
>  	id = imx_pcie->controller_id;
>  
> +	/* If mode_mask[0] is 0, means use phy driver to set mode */

/* If mode_mask is 0, then generic PHY driver is used to set the mode */

> +	if (!drvdata->mode_mask[0])
> +		return;
> +
>  	/* If mode_mask[id] is zero, means each controller have its individual gpr */
>  	if (!drvdata->mode_mask[id])
>  		id = 0;
> @@ -808,6 +813,7 @@ static void imx_pcie_ltssm_enable(struct device *dev)
>  	struct imx_pcie *imx_pcie = dev_get_drvdata(dev);
>  	const struct imx_pcie_drvdata *drvdata = imx_pcie->drvdata;
>  
> +	phy_set_speed(imx_pcie->phy, PCI_EXP_LNKCAP_SLS_2_5GB);

Is this setting really universal? This looks like applicable only to specific
platforms supporting this link speed.

>  	if (drvdata->ltssm_mask)
>  		regmap_update_bits(imx_pcie->iomuxc_gpr, drvdata->ltssm_off, drvdata->ltssm_mask,
>  				   drvdata->ltssm_mask);
> @@ -820,6 +826,7 @@ static void imx_pcie_ltssm_disable(struct device *dev)
>  	struct imx_pcie *imx_pcie = dev_get_drvdata(dev);
>  	const struct imx_pcie_drvdata *drvdata = imx_pcie->drvdata;
>  
> +	phy_set_speed(imx_pcie->phy, 0);
>  	if (drvdata->ltssm_mask)
>  		regmap_update_bits(imx_pcie->iomuxc_gpr, drvdata->ltssm_off,
>  				   drvdata->ltssm_mask, 0);
> @@ -955,6 +962,12 @@ static int imx_pcie_host_init(struct dw_pcie_rp *pp)
>  			goto err_clk_disable;
>  		}
>  
> +		ret = phy_set_mode_ext(imx_pcie->phy, PHY_MODE_PCIE, PHY_MODE_PCIE_RC);
> +		if (ret) {
> +			dev_err(dev, "unable to set pcie PHY mode\n");

s/pcie/PCIe

- Mani

-- 
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