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

Manivannan Sadhasivam
2024-06-30T16:23:46Z

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@nxp.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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