linux-kernel - Re: [Freedreno] [PATCH v3 3/5] drm/msm/dp: Refactor ioremap wrapper

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Date:   Tue, 05 Oct 2021 13:59:18 -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>,
        Kuogee Hsieh <khsieh@...eaurora.org>,
        Tanmay Shah <tanmay@...eaurora.org>,
        Chandan Uddaraju <chandanu@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Freedreno] [PATCH v3 3/5] drm/msm/dp: Refactor ioremap wrapper

On 2021-10-01 10:43, Bjorn Andersson wrote:
> In order to deal with multiple memory ranges in the following commit
> change the ioremap wrapper to not poke directly into the dss_io_data
> struct.
> 
> While at it, devm_ioremap_resource() already prints useful error
> messages on failure, so omit the unnecessary prints from the caller.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Reviewed-by: Abhinav Kumar <abhinavk@...eaurora.org>
> ---
> 
> Changes since v2:
> - Switched to devm_platform_get_and_ioremap_resource()
> 
>  drivers/gpu/drm/msm/dp/dp_parser.c | 35 ++++++++++--------------------
>  drivers/gpu/drm/msm/dp/dp_parser.h |  2 +-
>  2 files changed, 12 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c
> b/drivers/gpu/drm/msm/dp/dp_parser.c
> index c064ced78278..c05ba1990218 100644
> --- a/drivers/gpu/drm/msm/dp/dp_parser.c
> +++ b/drivers/gpu/drm/msm/dp/dp_parser.c
> @@ -19,40 +19,27 @@ static const struct dp_regulator_cfg 
> sdm845_dp_reg_cfg = {
>  	},
>  };
> 
> -static int msm_dss_ioremap(struct platform_device *pdev,
> -				struct dss_io_data *io_data)
> +static void __iomem *dp_ioremap(struct platform_device *pdev, int
> idx, size_t *len)
>  {
> -	struct resource *res = NULL;
> +	struct resource *res;
> +	void __iomem *base;
> 
> -	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	if (!res) {
> -		DRM_ERROR("%pS->%s: msm_dss_get_res failed\n",
> -			__builtin_return_address(0), __func__);
> -		return -ENODEV;
> -	}
> -
> -	io_data->len = (u32)resource_size(res);
> -	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__);
> -		return -EIO;
> -	}
> +	base = devm_platform_get_and_ioremap_resource(pdev, idx, &res);
> +	if (!IS_ERR(base))
> +		*len = resource_size(res);
> 
> -	return 0;
> +	return base;
>  }
> 
>  static int dp_parser_ctrl_res(struct dp_parser *parser)
>  {
> -	int rc = 0;
>  	struct platform_device *pdev = parser->pdev;
>  	struct dp_io *io = &parser->io;
> +	struct dss_io_data *dss = &io->dp_controller;
> 
> -	rc = msm_dss_ioremap(pdev, &io->dp_controller);
> -	if (rc) {
> -		DRM_ERROR("unable to remap dp io resources, rc=%d\n", rc);
> -		return rc;
> -	}
> +	dss->base = dp_ioremap(pdev, 0, &dss->len);
> +	if (IS_ERR(dss->base))
> +		return PTR_ERR(dss->base);
> 
>  	io->phy = devm_phy_get(&pdev->dev, "dp");
>  	if (IS_ERR(io->phy))
> diff --git a/drivers/gpu/drm/msm/dp/dp_parser.h
> b/drivers/gpu/drm/msm/dp/dp_parser.h
> index 34b49628bbaf..dc62e70b1640 100644
> --- a/drivers/gpu/drm/msm/dp/dp_parser.h
> +++ b/drivers/gpu/drm/msm/dp/dp_parser.h
> @@ -26,7 +26,7 @@ enum dp_pm_type {
>  };
> 
>  struct dss_io_data {
> -	u32 len;
> +	size_t len;
>  	void __iomem *base;
>  };