linux-kernel - Re: [PATCH v4 2/3] ata: ahci

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Date:	Fri, 10 Jan 2014 19:55:03 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Roger Quadros <rogerq@...com>, <tj@...nel.org>
CC:	<sergei.shtylyov@...entembedded.com>, <b.zolnierkie@...sung.com>,
	<hdegoede@...hat.com>, <arnd@...db.de>,
	<linux-ide@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>, Balaji T K <balajitk@...com>
Subject: Re: [PATCH v4 2/3] ata: ahci_platform: Manage SATA PHY

On Thursday 09 January 2014 04:26 PM, Roger Quadros wrote:
> From: Balaji T K <balajitk@...com>
> 
> Some platforms have a PHY hooked up to the
> SATA controller. The PHY needs to be initialized
> and powered up for SATA to work. We do that
> using the PHY framework.
> 
> [Roger Q] Cleaned up.
> 
> CC: Tejun Heo <tj@...nel.org>
> Signed-off-by: Balaji T K <balajitk@...com>
> Signed-off-by: Roger Quadros <rogerq@...com>

Acked-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/ata/ahci.h          |  2 ++
>  drivers/ata/ahci_platform.c | 46 ++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 47 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
> index 2289efd..f9bbada 100644
> --- a/drivers/ata/ahci.h
> +++ b/drivers/ata/ahci.h
> @@ -37,6 +37,7 @@
>  
>  #include <linux/clk.h>
>  #include <linux/libata.h>
> +#include <linux/phy/phy.h>
>  
>  /* Enclosure Management Control */
>  #define EM_CTRL_MSG_TYPE              0x000f0000
> @@ -322,6 +323,7 @@ struct ahci_host_priv {
>  	u32			em_buf_sz;	/* EM buffer size in byte */
>  	u32			em_msg_type;	/* EM message type */
>  	struct clk		*clk;		/* Only for platforms supporting clk */
> +	struct phy		*phy;		/* If platform uses phy */
>  	void			*plat_data;	/* Other platform data */
>  };
>  
> diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
> index d5ced13..b476642 100644
> --- a/drivers/ata/ahci_platform.c
> +++ b/drivers/ata/ahci_platform.c
> @@ -142,6 +142,39 @@ static int ahci_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> +	hpriv->phy = devm_phy_get(dev, "sata-phy");
> +	if (IS_ERR(hpriv->phy)) {
> +		rc = PTR_ERR(hpriv->phy);
> +		switch (rc) {
> +		case -ENODEV:
> +		case -ENOSYS:
> +			/* continue normally */
> +			hpriv->phy = NULL;
> +			break;
> +
> +		case -EPROBE_DEFER:
> +			goto disable_unprepare_clk;
> +			break;
> +
> +		default:
> +			dev_err(dev, "couldn't get sata-phy\n");
> +			goto disable_unprepare_clk;
> +			break;
> +		}
> +	}
> +
> +	if (hpriv->phy) {
> +		rc = phy_init(hpriv->phy);
> +		if (rc)
> +			goto disable_unprepare_clk;
> +
> +		rc = phy_power_on(hpriv->phy);
> +		if (rc) {
> +			phy_exit(hpriv->phy);
> +			goto disable_unprepare_clk;
> +		}
> +	}
> +
>  	/*
>  	 * Some platforms might need to prepare for mmio region access,
>  	 * which could be done in the following init call. So, the mmio
> @@ -151,7 +184,7 @@ static int ahci_probe(struct platform_device *pdev)
>  	if (pdata && pdata->init) {
>  		rc = pdata->init(dev, hpriv->mmio);
>  		if (rc)
> -			goto disable_unprepare_clk;
> +			goto disable_phy;
>  	}
>  
>  	ahci_save_initial_config(dev, hpriv,
> @@ -221,6 +254,12 @@ static int ahci_probe(struct platform_device *pdev)
>  pdata_exit:
>  	if (pdata && pdata->exit)
>  		pdata->exit(dev);
> +disable_phy:
> +	if (hpriv->phy) {
> +		phy_power_off(hpriv->phy);
> +		phy_exit(hpriv->phy);
> +	}
> +
>  disable_unprepare_clk:
>  	if (!IS_ERR(hpriv->clk))
>  		clk_disable_unprepare(hpriv->clk);
> @@ -239,6 +278,11 @@ static void ahci_host_stop(struct ata_host *host)
>  	if (pdata && pdata->exit)
>  		pdata->exit(dev);
>  
> +	if (hpriv->phy) {
> +		phy_power_off(hpriv->phy);
> +		phy_exit(hpriv->phy);
> +	}
> +
>  	if (!IS_ERR(hpriv->clk)) {
>  		clk_disable_unprepare(hpriv->clk);
>  		clk_put(hpriv->clk);
> 

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