linux-kernel - Re: [PATCH 10/17] fpga: dfl: afu: export __port

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Date:   Tue, 2 Apr 2019 08:50:18 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     Wu Hao <hao.wu@...el.com>
Cc:     atull@...nel.org, mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Xu Yilun <yilun.xu@...el.com>
Subject: Re: [PATCH 10/17] fpga: dfl: afu: export __port_enable/disable
 function.

On Mon, Mar 25, 2019 at 11:07:37AM +0800, Wu Hao wrote:
> As these two functions are used by other private features. e.g.
> in error reporting private feature, it requires to check port status
> and reset port for error clearing.
> 
> Signed-off-by: Xu Yilun <yilun.xu@...el.com>
> Signed-off-by: Wu Hao <hao.wu@...el.com>
Acked-by: Moritz Fischer <mdf@...nel.org>
> ---
>  drivers/fpga/dfl-afu-main.c | 25 ++++++++++++++-----------
>  drivers/fpga/dfl-afu.h      |  3 +++
>  2 files changed, 17 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
> index 2916876..e727d9b 100644
> --- a/drivers/fpga/dfl-afu-main.c
> +++ b/drivers/fpga/dfl-afu-main.c
> @@ -24,14 +24,16 @@
>  #define DRV_VERSION	"0.8"
>  
>  /**
> - * port_enable - enable a port
> + * __port_enable - enable a port
>   * @pdev: port platform device.
>   *
>   * Enable Port by clear the port soft reset bit, which is set by default.
>   * The AFU is unable to respond to any MMIO access while in reset.
> - * port_enable function should only be used after port_disable function.
> + * __port_enable function should only be used after __port_disable function.
> + *
> + * The caller needs to hold lock for protection.
>   */
> -static void port_enable(struct platform_device *pdev)
> +void __port_enable(struct platform_device *pdev)
>  {
>  	struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
>  	void __iomem *base;
> @@ -54,13 +56,14 @@ static void port_enable(struct platform_device *pdev)
>  #define RST_POLL_TIMEOUT 1000 /* us */
>  
>  /**
> - * port_disable - disable a port
> + * __port_disable - disable a port
>   * @pdev: port platform device.
>   *
> - * Disable Port by setting the port soft reset bit, it puts the port into
> - * reset.
> + * Disable Port by setting the port soft reset bit, it puts the port into reset.
> + *
> + * The caller needs to hold lock for protection.
>   */
> -static int port_disable(struct platform_device *pdev)
> +int __port_disable(struct platform_device *pdev)
>  {
>  	struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
>  	void __iomem *base;
> @@ -106,9 +109,9 @@ static int __port_reset(struct platform_device *pdev)
>  {
>  	int ret;
>  
> -	ret = port_disable(pdev);
> +	ret = __port_disable(pdev);
>  	if (!ret)
> -		port_enable(pdev);
> +		__port_enable(pdev);
>  
>  	return ret;
>  }
> @@ -810,9 +813,9 @@ static int port_enable_set(struct platform_device *pdev, bool enable)
>  
>  	mutex_lock(&pdata->lock);
>  	if (enable)
> -		port_enable(pdev);
> +		__port_enable(pdev);
>  	else
> -		ret = port_disable(pdev);
> +		ret = __port_disable(pdev);
>  	mutex_unlock(&pdata->lock);
>  
>  	return ret;
> diff --git a/drivers/fpga/dfl-afu.h b/drivers/fpga/dfl-afu.h
> index 0c7630a..35e60c5 100644
> --- a/drivers/fpga/dfl-afu.h
> +++ b/drivers/fpga/dfl-afu.h
> @@ -79,6 +79,9 @@ struct dfl_afu {
>  	struct dfl_feature_platform_data *pdata;
>  };
>  
> +void __port_enable(struct platform_device *pdev);
> +int __port_disable(struct platform_device *pdev);
> +
>  void afu_mmio_region_init(struct dfl_feature_platform_data *pdata);
>  int afu_mmio_region_add(struct dfl_feature_platform_data *pdata,
>  			u32 region_index, u64 region_size, u64 phys, u32 flags);
> -- 
> 2.7.4
>