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Date:   Fri, 1 Dec 2017 08:32:41 +0000
From:   Philippe CORNU <philippe.cornu@...com>
To:     Nickey Yang <nickey.yang@...k-chips.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "heiko@...ech.de" <heiko@...ech.de>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "airlied@...ux.ie" <airlied@...ux.ie>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-rockchip@...ts.infradead.org" 
        <linux-rockchip@...ts.infradead.org>,
        "laurent.pinchart@...asonboard.com" 
        <laurent.pinchart@...asonboard.com>,
        "seanpaul@...omium.org" <seanpaul@...omium.org>,
        "briannorris@...omium.org" <briannorris@...omium.org>,
        "mka@...omium.org" <mka@...omium.org>,
        "hoegsberg@...il.com" <hoegsberg@...il.com>,
        "architt@...eaurora.org" <architt@...eaurora.org>,
        Yannick FERTRE <yannick.fertre@...com>,
        "hl@...k-chips.com" <hl@...k-chips.com>,
        "zyw@...k-chips.com" <zyw@...k-chips.com>,
        "xbl@...k-chips.com" <xbl@...k-chips.com>
Subject: Re: [PATCH v4 1/3] drm/bridge/synopsys: dsi: stop clobbering drvdata

Dear Nickey,

Many thanks for your patch.

I am sorry to say that but you can not add my "Acked-by" to this patch 
because this code is different from the "original" one from Brian (which 
got my "Acked-by").

Sometimes it is not an issue because differences are not important but 
in this particular case, the code is really different: you have remove 
platform_set_drvdata() & platform_get_drvdata() in the stm part.

Could you please go back to the original code or propose me an updated 
version of this code.

Many thanks,

Philippe :-)


On 12/01/2017 04:58 AM, Nickey Yang wrote:
> From: Brian Norris <briannorris@...omium.org>
> 
> Bridge drivers/helpers shouldn't be clobbering the drvdata, since a
> parent driver might need to own this. Instead, let's return our
> 'dw_mipi_dsi' object and have callers pass that back to us for removal.
> 
> Signed-off-by: Brian Norris <briannorris@...omium.org>
> Signed-off-by: Nickey Yang <nickey.yang@...k-chips.com>
> Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
> Reviewed-by: Archit Taneja <architt@...eaurora.org>
> Acked-by: Philippe Cornu <philippe.cornu@...com>
> Link:https://patchwork.kernel.org/patch/10078493/
> 
> ---
> Changes in v4:
> - Add From tag,update subject line
> - keep patch "drm/stm: dsi: Adjust dw_mipi_dsi_probe and remove"
>    in this piece together.
> 
>   drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 36 ++++++++++-----------------
>   drivers/gpu/drm/stm/dw_mipi_dsi-stm.c         |  8 +++---
>   include/drm/bridge/dw_mipi_dsi.h              | 17 ++++++++-----
>   3 files changed, 29 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> index d9cca4f..c39c7dc 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> @@ -922,8 +922,6 @@ static int dw_mipi_dsi_bridge_attach(struct drm_bridge *bridge)
>   	dsi->bridge.of_node = pdev->dev.of_node;
>   #endif
>   
> -	dev_set_drvdata(dev, dsi);
> -
>   	return dsi;
>   }
>   
> @@ -935,23 +933,16 @@ static void __dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi)
>   /*
>    * Probe/remove API, used from platforms based on the DRM bridge API.
>    */
> -int dw_mipi_dsi_probe(struct platform_device *pdev,
> -		      const struct dw_mipi_dsi_plat_data *plat_data)
> +struct dw_mipi_dsi *
> +dw_mipi_dsi_probe(struct platform_device *pdev,
> +		  const struct dw_mipi_dsi_plat_data *plat_data)
>   {
> -	struct dw_mipi_dsi *dsi;
> -
> -	dsi = __dw_mipi_dsi_probe(pdev, plat_data);
> -	if (IS_ERR(dsi))
> -		return PTR_ERR(dsi);
> -
> -	return 0;
> +	return __dw_mipi_dsi_probe(pdev, plat_data);
>   }
>   EXPORT_SYMBOL_GPL(dw_mipi_dsi_probe);
>   
> -void dw_mipi_dsi_remove(struct platform_device *pdev)
> +void dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi)
>   {
> -	struct dw_mipi_dsi *dsi = platform_get_drvdata(pdev);
> -
>   	mipi_dsi_host_unregister(&dsi->dsi_host);
>   
>   	__dw_mipi_dsi_remove(dsi);
> @@ -961,31 +952,30 @@ void dw_mipi_dsi_remove(struct platform_device *pdev)
>   /*
>    * Bind/unbind API, used from platforms based on the component framework.
>    */
> -int dw_mipi_dsi_bind(struct platform_device *pdev, struct drm_encoder *encoder,
> -		     const struct dw_mipi_dsi_plat_data *plat_data)
> +struct dw_mipi_dsi *
> +dw_mipi_dsi_bind(struct platform_device *pdev, struct drm_encoder *encoder,
> +		 const struct dw_mipi_dsi_plat_data *plat_data)
>   {
>   	struct dw_mipi_dsi *dsi;
>   	int ret;
>   
>   	dsi = __dw_mipi_dsi_probe(pdev, plat_data);
>   	if (IS_ERR(dsi))
> -		return PTR_ERR(dsi);
> +		return dsi;
>   
>   	ret = drm_bridge_attach(encoder, &dsi->bridge, NULL);
>   	if (ret) {
> -		dw_mipi_dsi_remove(pdev);
> +		dw_mipi_dsi_remove(dsi);
>   		DRM_ERROR("Failed to initialize bridge with drm\n");
> -		return ret;
> +		return ERR_PTR(ret);
>   	}
>   
> -	return 0;
> +	return dsi;
>   }
>   EXPORT_SYMBOL_GPL(dw_mipi_dsi_bind);
>   
> -void dw_mipi_dsi_unbind(struct device *dev)
> +void dw_mipi_dsi_unbind(struct dw_mipi_dsi *dsi)
>   {
> -	struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);
> -
>   	__dw_mipi_dsi_remove(dsi);
>   }
>   EXPORT_SYMBOL_GPL(dw_mipi_dsi_unbind);
> diff --git a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> index e5b6310..80f9950 100644
> --- a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> +++ b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c
> @@ -66,6 +66,7 @@ enum dsi_color {
>   struct dw_mipi_dsi_stm {
>   	void __iomem *base;
>   	struct clk *pllref_clk;
> +	struct dw_mipi_dsi *dmd;
>   };
>   
>   static inline void dsi_write(struct dw_mipi_dsi_stm *dsi, u32 reg, u32 val)
> @@ -318,10 +319,11 @@ static int dw_mipi_dsi_stm_probe(struct platform_device *pdev)
>   	dw_mipi_dsi_stm_plat_data.base = dsi->base;
>   	dw_mipi_dsi_stm_plat_data.priv_data = dsi;
>   
> -	ret = dw_mipi_dsi_probe(pdev, &dw_mipi_dsi_stm_plat_data);
> -	if (ret) {
> +	dsi->dmd = dw_mipi_dsi_probe(pdev, &dw_mipi_dsi_stm_plat_data);
> +	if (IS_ERR(dsi->dmd)) {
>   		DRM_ERROR("Failed to initialize mipi dsi host\n");
>   		clk_disable_unprepare(dsi->pllref_clk);
> +		return PTR_ERR(dsi->dmd);
>   	}
>   
>   	return ret;
> @@ -332,7 +334,7 @@ static int dw_mipi_dsi_stm_remove(struct platform_device *pdev)
>   	struct dw_mipi_dsi_stm *dsi = dw_mipi_dsi_stm_plat_data.priv_data;
>   
>   	clk_disable_unprepare(dsi->pllref_clk);
> -	dw_mipi_dsi_remove(pdev);
> +	dw_mipi_dsi_remove(dsi->dmd);
>   
>   	return 0;
>   }
> diff --git a/include/drm/bridge/dw_mipi_dsi.h b/include/drm/bridge/dw_mipi_dsi.h
> index 9b30fec..d9c6d54 100644
> --- a/include/drm/bridge/dw_mipi_dsi.h
> +++ b/include/drm/bridge/dw_mipi_dsi.h
> @@ -10,6 +10,8 @@
>   #ifndef __DW_MIPI_DSI__
>   #define __DW_MIPI_DSI__
>   
> +struct dw_mipi_dsi;
> +
>   struct dw_mipi_dsi_phy_ops {
>   	int (*init)(void *priv_data);
>   	int (*get_lane_mbps)(void *priv_data, struct drm_display_mode *mode,
> @@ -29,11 +31,14 @@ struct dw_mipi_dsi_plat_data {
>   	void *priv_data;
>   };
>   
> -int dw_mipi_dsi_probe(struct platform_device *pdev,
> -		      const struct dw_mipi_dsi_plat_data *plat_data);
> -void dw_mipi_dsi_remove(struct platform_device *pdev);
> -int dw_mipi_dsi_bind(struct platform_device *pdev, struct drm_encoder *encoder,
> -		     const struct dw_mipi_dsi_plat_data *plat_data);
> -void dw_mipi_dsi_unbind(struct device *dev);
> +struct dw_mipi_dsi *dw_mipi_dsi_probe(struct platform_device *pdev,
> +				      const struct dw_mipi_dsi_plat_data
> +				      *plat_data);
> +void dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi);
> +struct dw_mipi_dsi *dw_mipi_dsi_bind(struct platform_device *pdev,
> +				     struct drm_encoder *encoder,
> +				     const struct dw_mipi_dsi_plat_data
> +				     *plat_data);
> +void dw_mipi_dsi_unbind(struct dw_mipi_dsi *dsi);
>   
>   #endif /* __DW_MIPI_DSI__ */
> 

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