linux-kernel - Re: [Freedreno] [PATCH 2/5] drm/msm/dp: Use devres for ioremap()

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Message-ID: <612495cded56d0ec6abe502a296ebd6b@codeaurora.org>
Date:   Fri, 23 Jul 2021 13:11:57 -0700
From:   abhinavk@...eaurora.org
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Kuogee Hsieh <khsieh@...eaurora.org>,
        Tanmay Shah <tanmay@...eaurora.org>,
        freedreno@...ts.freedesktop.org,
        Chandan Uddaraju <chandanu@...eaurora.org>
Subject: Re: [Freedreno] [PATCH 2/5] drm/msm/dp: Use devres for ioremap()

On 2021-07-21 19:42, Bjorn Andersson wrote:
> The non-devres version of ioremap is used, which requires manual
> cleanup. But the code paths leading here is mixed with other devres
> users, so rely on this for ioremap as well to simplify the code.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Reviewed-by: Abhinav Kumar <abhinavk@...eaurora.org>
> ---
>  drivers/gpu/drm/msm/dp/dp_parser.c | 29 ++++-------------------------
>  1 file changed, 4 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c
> b/drivers/gpu/drm/msm/dp/dp_parser.c
> index 0519dd3ac3c3..c064ced78278 100644
> --- a/drivers/gpu/drm/msm/dp/dp_parser.c
> +++ b/drivers/gpu/drm/msm/dp/dp_parser.c
> @@ -32,7 +32,7 @@ static int msm_dss_ioremap(struct platform_device 
> *pdev,
>  	}
> 
>  	io_data->len = (u32)resource_size(res);
> -	io_data->base = ioremap(res->start, io_data->len);
> +	io_data->base = devm_ioremap(&pdev->dev, res->start, io_data->len);
>  	if (!io_data->base) {
>  		DRM_ERROR("%pS->%s: ioremap failed\n",
>  			__builtin_return_address(0), __func__);
> @@ -42,22 +42,6 @@ static int msm_dss_ioremap(struct platform_device 
> *pdev,
>  	return 0;
>  }
> 
> -static void msm_dss_iounmap(struct dss_io_data *io_data)
> -{
> -	if (io_data->base) {
> -		iounmap(io_data->base);
> -		io_data->base = NULL;
> -	}
> -	io_data->len = 0;
> -}
> -
> -static void dp_parser_unmap_io_resources(struct dp_parser *parser)
> -{
> -	struct dp_io *io = &parser->io;
> -
> -	msm_dss_iounmap(&io->dp_controller);
> -}
> -
>  static int dp_parser_ctrl_res(struct dp_parser *parser)
>  {
>  	int rc = 0;
> @@ -67,19 +51,14 @@ static int dp_parser_ctrl_res(struct dp_parser 
> *parser)
>  	rc = msm_dss_ioremap(pdev, &io->dp_controller);
>  	if (rc) {
>  		DRM_ERROR("unable to remap dp io resources, rc=%d\n", rc);
> -		goto err;
> +		return rc;
>  	}
> 
>  	io->phy = devm_phy_get(&pdev->dev, "dp");
> -	if (IS_ERR(io->phy)) {
> -		rc = PTR_ERR(io->phy);
> -		goto err;
> -	}
> +	if (IS_ERR(io->phy))
> +		return PTR_ERR(io->phy);
> 
>  	return 0;
> -err:
> -	dp_parser_unmap_io_resources(parser);
> -	return rc;
>  }
> 
>  static int dp_parser_misc(struct dp_parser *parser)