Re: [PATCH v10 4/8] ata: libahci: allow to use multiple PHYs

Lothar Waßmann
2014-07-18T13:18:26Z

Hi,

Antoine Ténart wrote:
> The current implementation of the libahci does not allow to use multiple
> PHYs. This patch adds the support of multiple PHYs by the libahci while
> keeping the old bindings valid for device tree compatibility.
>
> This introduce a new way of defining SATA ports in the device tree, with
> one port per sub-node. This as the advantage of allowing a per port
> configuration. Because some ports may be accessible but disabled in the
> device tree, the port_map mask is computed automatically when using
> this.
>
> Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
> ---
> drivers/ata/ahci.h | 3 +-
> drivers/ata/libahci_platform.c | 179 ++++++++++++++++++++++++++++++++---------
> 2 files changed, 142 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
> index cb8d58926851..b0ea7b077d6e 100644
> --- a/drivers/ata/ahci.h
> +++ b/drivers/ata/ahci.h
> @@ -332,7 +332,8 @@ struct ahci_host_priv {
> bool got_runtime_pm; /* Did we do pm_runtime_get? */
> struct clk *clks[AHCI_MAX_CLKS]; /* Optional */
> struct regulator *target_pwr; /* Optional */
> - struct phy *phy; /* If platform uses phy */
> + struct phy **phys; /* If platform uses phys */
> + unsigned nphys; /* Number of phys */
> void *plat_data; /* Other platform data */
> /*
> * Optional ahci_start_engine override, if not set this gets set to the
> diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
> index db9b90d876dd..2c2439b4101d 100644
> --- a/drivers/ata/libahci_platform.c
> +++ b/drivers/ata/libahci_platform.c
> @@ -39,6 +39,61 @@ static struct scsi_host_template ahci_platform_sht = {
> };
>
> /**
> + * ahci_platform_enable_phys - Enable PHYs
> + * @hpriv: host private area to store config values
> + *
> + * This function enables all the PHYs found in hpriv->phys, if any.
> + * If a PHY fails to be enabled, it disables all the PHYs already
> + * enabled in reverse order and returns an error.
> + *
> + * RETURNS:
> + * 0 on success otherwise a negative error code
> + */
> +int ahci_platform_enable_phys(struct ahci_host_priv *hpriv)
> +{
> + int i, rc = 0;
> +
You shouldn't have to initialize rc here, or does your gcc falsely
complain about an uninitialized variable if you don't?

> + for (i = 0; i < hpriv->nphys; i++) {
> + rc = phy_init(hpriv->phys[i]);
> + if (rc)
> + goto disable_phys;
> +
> + rc = phy_power_on(hpriv->phys[i]);
> + if (rc) {
> + phy_exit(hpriv->phys[i]);
> + goto disable_phys;
> + }
> + }
> +
> + return 0;
> +
> +disable_phys:
> + while (--i >= 0) {
> + phy_power_off(hpriv->phys[i]);
> + phy_exit(hpriv->phys[i]);
> + }
> + return rc;
> +}

Lothar Waßmann
--
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