Re: [PATCH v2] ata: ahci_ceva: fix error handling for Xilinx GT PHY support

From: Niklas Cassel
Date: Fri Feb 16 2024 - 05:30:11 EST

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Hello Radhey,

On Thu, Feb 15, 2024 at 11:31:00PM +0530, Radhey Shyam Pandey wrote:
> Platform clock and phy error resources are not cleaned up in Xilinx GT PHY
> error path.
>
> To fix it create a wrapper ceva_ahci_platform_enable_resources() API which
> is a customized version of ahci_platform_enable_resources() and inline with
> SATA IP programming sequence it does:
>
> - Assert SATA reset
> - Program PS GTR phy
> - Bring SATA by de-asserting the reset
> - Wait for GT lane PLL to be locked
>
> It switches to ceva_ahci_platform_enable_resources() in resume path
> as same SATA programming sequence (as in probe) should be followed.
>
> It also cleanup mix usage of ahci_platform_enable_resources() and custom
> implementation in probe function as both are not required.
>
> Fixes: 9a9d3abe24bb ("ata: ahci: ceva: Update the driver to support xilinx GT phy")
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xxxxxxx>
> ---
> Changes for v2:
>
> - Create wrapper ceva_ahci_platform_enable_resources()
> - Remove legacy ahci_platform_enable_resources() and its related code.
> - Modified commit description and merge 1/2 and 2/2 fix as it is
> automatically done when reusing ahci_platform_enable_resources()
> logic.
> - Drop Reviewed-by: Damien Le Moal <dlemoal@xxxxxxxxxx> tag.
> ---
> drivers/ata/ahci_ceva.c | 125 +++++++++++++++++++++++++---------------
> 1 file changed, 79 insertions(+), 46 deletions(-)
>
> diff --git a/drivers/ata/ahci_ceva.c b/drivers/ata/ahci_ceva.c
> index 64f7f7d6ba84..c04f5033f981 100644
> --- a/drivers/ata/ahci_ceva.c
> +++ b/drivers/ata/ahci_ceva.c
> @@ -88,7 +88,6 @@ struct ceva_ahci_priv {
> u32 axicc;
> bool is_cci_enabled;
> int flags;
> - struct reset_control *rst;
> };
>
> static unsigned int ceva_ahci_read_id(struct ata_device *dev,
> @@ -189,6 +188,60 @@ static const struct scsi_host_template ahci_platform_sht = {
> AHCI_SHT(DRV_NAME),
> };
>
> +static int ceva_ahci_platform_enable_resources(struct ahci_host_priv *hpriv)
> +{
> + int rc, i;
> +
> + rc = ahci_platform_enable_regulators(hpriv);
> + if (rc)
> + return rc;
> +
> + rc = ahci_platform_enable_clks(hpriv);
> + if (rc)
> + goto disable_regulator;
> +
> + /* Assert the controller reset */
> + rc = ahci_platform_assert_rsts(hpriv);
> + if (rc)
> + goto disable_clks;
> +
> + for (i = 0; i < hpriv->nports; i++) {
> + rc = phy_init(hpriv->phys[i]);
> + if (rc)
> + goto disable_rsts;
> + }
> +
> + /* De-assert the controller reset */
> + ahci_platform_deassert_rsts(hpriv);
> +
> + for (i = 0; i < hpriv->nports; i++) {
> + rc = phy_power_on(hpriv->phys[i]);
> + if (rc) {
> + phy_exit(hpriv->phys[i]);
> + goto disable_phys;
> + }
> + }
> +
> + return 0;
> +
> +disable_rsts:
> + ahci_platform_deassert_rsts(hpriv);
> +
> +disable_phys:
> + while (--i >= 0) {
> + phy_power_off(hpriv->phys[i]);
> + phy_exit(hpriv->phys[i]);
> + }
> +
> +disable_clks:
> + ahci_platform_disable_clks(hpriv);
> +
> +disable_regulator:
> + ahci_platform_disable_regulators(hpriv);
> +
> + return rc;
> +}
> +
> static int ceva_ahci_probe(struct platform_device *pdev)
> {
> struct device_node *np = pdev->dev.of_node;
> @@ -203,47 +256,19 @@ static int ceva_ahci_probe(struct platform_device *pdev)
> return -ENOMEM;
>
> cevapriv->ahci_pdev = pdev;
> -
> - cevapriv->rst = devm_reset_control_get_optional_exclusive(&pdev->dev,
> - NULL);
> - if (IS_ERR(cevapriv->rst))
> - dev_err_probe(&pdev->dev, PTR_ERR(cevapriv->rst),
> - "failed to get reset\n");
> -
> hpriv = ahci_platform_get_resources(pdev, 0);
> if (IS_ERR(hpriv))
> return PTR_ERR(hpriv);
>
> - if (!cevapriv->rst) {
> - rc = ahci_platform_enable_resources(hpriv);
> - if (rc)
> - return rc;
> - } else {
> - int i;
> -
> - rc = ahci_platform_enable_clks(hpriv);
> - if (rc)
> - return rc;
> - /* Assert the controller reset */
> - reset_control_assert(cevapriv->rst);
> -
> - for (i = 0; i < hpriv->nports; i++) {
> - rc = phy_init(hpriv->phys[i]);
> - if (rc)
> - return rc;
> - }
> -
> - /* De-assert the controller reset */
> - reset_control_deassert(cevapriv->rst);
> + hpriv->rsts = devm_reset_control_get_optional_exclusive(&pdev->dev,
> + NULL);
> + if (IS_ERR(hpriv->rsts))
> + dev_err_probe(&pdev->dev, PTR_ERR(hpriv->rsts),
> + "failed to get reset\n");
>

Here you just continue on even though there was an error.
You should return the error here.

It can be done in one statement:
return dev_err_probe(&pdev->dev, PTR_ERR(hpriv->rsts),
"failed to get reset\n");

Otherwise, this looks good.

Kind regards,
Niklas

> - for (i = 0; i < hpriv->nports; i++) {
> - rc = phy_power_on(hpriv->phys[i]);
> - if (rc) {
> - phy_exit(hpriv->phys[i]);
> - return rc;
> - }
> - }
> - }
> + rc = ceva_ahci_platform_enable_resources(hpriv);
> + if (rc)
> + return rc;
>
> if (of_property_read_bool(np, "ceva,broken-gen2"))
> cevapriv->flags = CEVA_FLAG_BROKEN_GEN2;
> @@ -252,52 +277,60 @@ static int ceva_ahci_probe(struct platform_device *pdev)
> if (of_property_read_u8_array(np, "ceva,p0-cominit-params",
> (u8 *)&cevapriv->pp2c[0], 4) < 0) {
> dev_warn(dev, "ceva,p0-cominit-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_resources;
> }
>
> if (of_property_read_u8_array(np, "ceva,p1-cominit-params",
> (u8 *)&cevapriv->pp2c[1], 4) < 0) {
> dev_warn(dev, "ceva,p1-cominit-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_resources;
> }
>
> /* Read OOB timing value for COMWAKE from device-tree*/
> if (of_property_read_u8_array(np, "ceva,p0-comwake-params",
> (u8 *)&cevapriv->pp3c[0], 4) < 0) {
> dev_warn(dev, "ceva,p0-comwake-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_resources;
> }
>
> if (of_property_read_u8_array(np, "ceva,p1-comwake-params",
> (u8 *)&cevapriv->pp3c[1], 4) < 0) {
> dev_warn(dev, "ceva,p1-comwake-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_resources;
> }
>
> /* Read phy BURST timing value from device-tree */
> if (of_property_read_u8_array(np, "ceva,p0-burst-params",
> (u8 *)&cevapriv->pp4c[0], 4) < 0) {
> dev_warn(dev, "ceva,p0-burst-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_resources;
> }
>
> if (of_property_read_u8_array(np, "ceva,p1-burst-params",
> (u8 *)&cevapriv->pp4c[1], 4) < 0) {
> dev_warn(dev, "ceva,p1-burst-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_resources;
> }
>
> /* Read phy RETRY interval timing value from device-tree */
> if (of_property_read_u16_array(np, "ceva,p0-retry-params",
> (u16 *)&cevapriv->pp5c[0], 2) < 0) {
> dev_warn(dev, "ceva,p0-retry-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_resources;
> }
>
> if (of_property_read_u16_array(np, "ceva,p1-retry-params",
> (u16 *)&cevapriv->pp5c[1], 2) < 0) {
> dev_warn(dev, "ceva,p1-retry-params property not defined\n");
> - return -EINVAL;
> + rc = -EINVAL;
> + goto disable_resources;
> }
>
> /*
> @@ -335,7 +368,7 @@ static int __maybe_unused ceva_ahci_resume(struct device *dev)
> struct ahci_host_priv *hpriv = host->private_data;
> int rc;
>
> - rc = ahci_platform_enable_resources(hpriv);
> + rc = ceva_ahci_platform_enable_resources(hpriv);
> if (rc)
> return rc;
>
> --
> 2.34.1
>

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