linux-kernel - Re: [PATCH 2/3] drm/exynos: dp: Remove support for unused dptx-phy

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Message-id: <54522CF7.6030302@samsung.com>
Date:	Thu, 30 Oct 2014 21:20:07 +0900
From:	Inki Dae <inki.dae@...sung.com>
To:	Vivek Gautam <gautam.vivek@...sung.com>
Cc:	dri-devel@...ts.freedesktop.org, linux-samsung-soc@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	seanpaul@...gle.com, kishon@...com, ajaykumar.rs@...sung.com,
	Jingoo Han <jg1.han@...sung.com>, "cpgs ." <cpgs@...sung.com>
Subject: Re: [PATCH 2/3] drm/exynos: dp: Remove support for unused dptx-phy


Sorry for late. I missed this patch a little bit for long time.


On 2014년 09월 15일 22:13, Vivek Gautam wrote:
> Now that we have moved to generic phy based bindings,
> we don't need to have any code related to older dptx-phy.
> Nobody is using this dptx-phy anymore, so removing the
> same.
> 
> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> Cc: Jingoo Han <jg1.han@...sung.com>
> ---
>  drivers/gpu/drm/exynos/exynos_dp_core.c |   58 +++++++------------------------
>  drivers/gpu/drm/exynos/exynos_dp_core.h |    2 --
>  2 files changed, 13 insertions(+), 47 deletions(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.c b/drivers/gpu/drm/exynos/exynos_dp_core.c
> index 4f3c7eb..5ffc1b2 100644
> --- a/drivers/gpu/drm/exynos/exynos_dp_core.c
> +++ b/drivers/gpu/drm/exynos/exynos_dp_core.c
> @@ -1050,28 +1050,14 @@ static int exynos_dp_create_connector(struct exynos_drm_display *display,
>  
>  static void exynos_dp_phy_init(struct exynos_dp_device *dp)
>  {
> -	if (dp->phy) {
> +	if (dp->phy)
>  		phy_power_on(dp->phy);
> -	} else if (dp->phy_addr) {
> -		u32 reg;
> -
> -		reg = __raw_readl(dp->phy_addr);
> -		reg |= dp->enable_mask;
> -		__raw_writel(reg, dp->phy_addr);
> -	}
>  }
>  
>  static void exynos_dp_phy_exit(struct exynos_dp_device *dp)
>  {
> -	if (dp->phy) {
> +	if (dp->phy)
>  		phy_power_off(dp->phy);
> -	} else if (dp->phy_addr) {
> -		u32 reg;
> -
> -		reg = __raw_readl(dp->phy_addr);
> -		reg &= ~(dp->enable_mask);
> -		__raw_writel(reg, dp->phy_addr);
> -	}
>  }
>  
>  static void exynos_dp_poweron(struct exynos_drm_display *display)
> @@ -1210,39 +1196,21 @@ static struct video_info *exynos_dp_dt_parse_pdata(struct device *dev)
>  
>  static int exynos_dp_dt_parse_phydata(struct exynos_dp_device *dp)
>  {
> -	struct device_node *dp_phy_node = of_node_get(dp->dev->of_node);
> -	u32 phy_base;
>  	int ret = 0;
>  
> -	dp_phy_node = of_find_node_by_name(dp_phy_node, "dptx-phy");
> -	if (!dp_phy_node) {
> -		dp->phy = devm_phy_get(dp->dev, "dp");
> -		return PTR_ERR_OR_ZERO(dp->phy);
> -	}
> -
> -	if (of_property_read_u32(dp_phy_node, "reg", &phy_base)) {
> -		dev_err(dp->dev, "failed to get reg for dptx-phy\n");
> -		ret = -EINVAL;
> -		goto err;
> -	}
> -
> -	if (of_property_read_u32(dp_phy_node, "samsung,enable-mask",
> -				&dp->enable_mask)) {
> -		dev_err(dp->dev, "failed to get enable-mask for dptx-phy\n");
> -		ret = -EINVAL;
> -		goto err;
> -	}
> -
> -	dp->phy_addr = ioremap(phy_base, SZ_4);
> -	if (!dp->phy_addr) {
> -		dev_err(dp->dev, "failed to ioremap dp-phy\n");
> -		ret = -ENOMEM;
> -		goto err;
> +	dp->phy = devm_phy_get(dp->dev, "dp");
> +	if (IS_ERR(dp->phy)) {
> +		ret = PTR_ERR(dp->phy);
> +		if (ret == -ENOSYS || ret == -ENODEV) {
> +			dp->phy = NULL;
> +		} else if (ret == -EPROBE_DEFER) {
> +			return ret;
> +		} else {

WARNING: else is not generally useful after a break or return
#146: FILE: drivers/gpu/drm/exynos/exynos_dp_core.c:1208:
+			return ret;
+		} else {

How about just returning ret like below?
		if (IS_ERR(dp->phy)) {
			dev_err(dp->dev, "no DP phy configured\n");
			return PTR_ERR(ret);
		}

And then you can handle the error at probe function properly.

Thanks,
Inki Dae


> +			dev_err(dp->dev, "no DP phy configured\n");
> +			return ret;
> +		}
>  	}
>  
> -err:
> -	of_node_put(dp_phy_node);
> -
>  	return ret;
>  }
>  
> diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.h b/drivers/gpu/drm/exynos/exynos_dp_core.h
> index a1aee69..6426201 100644
> --- a/drivers/gpu/drm/exynos/exynos_dp_core.h
> +++ b/drivers/gpu/drm/exynos/exynos_dp_core.h
> @@ -153,8 +153,6 @@ struct exynos_dp_device {
>  	struct clk		*clock;
>  	unsigned int		irq;
>  	void __iomem		*reg_base;
> -	void __iomem		*phy_addr;
> -	unsigned int		enable_mask;
>  
>  	struct video_info	*video_info;
>  	struct link_train	link_train;
> 

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