linux-kernel - Re: [PATCH v3 1/2] drm/imx/dcss: request memory region

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Date: Wed, 17 Jan 2024 14:18:31 +0200
From: Laurentiu Palcu <laurentiu.palcu@....nxp.com>
To: Philipp Stanner <pstanner@...hat.com>
Cc: Lucas Stach <l.stach@...gutronix.de>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	NXP Linux Team <linux-imx@....com>, dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] drm/imx/dcss: request memory region

Hi Philipp,

On Thu, Jan 11, 2024 at 11:13:46AM +0100, Philipp Stanner wrote:
> The driver's memory regions are currently just ioremap()ed, but not
> reserved through a request. That's not a bug, but having the request is
> a little more robust.
> 
> Implement the region-request through the corresponding managed
> devres-function.
> 
> Signed-off-by: Philipp Stanner <pstanner@...hat.com>

Reviewed-by: Laurentiu Palcu <laurentiu.palcu@....nxp.com>

Thanks,
Laurentiu

> ---
>  drivers/gpu/drm/imx/dcss/dcss-dev.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-dev.c b/drivers/gpu/drm/imx/dcss/dcss-dev.c
> index 4f3af0dfb344..d448bf1c205e 100644
> --- a/drivers/gpu/drm/imx/dcss/dcss-dev.c
> +++ b/drivers/gpu/drm/imx/dcss/dcss-dev.c
> @@ -170,6 +170,7 @@ struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output)
>  	struct resource *res;
>  	struct dcss_dev *dcss;
>  	const struct dcss_type_data *devtype;
> +	resource_size_t res_len;
>  
>  	devtype = of_device_get_match_data(dev);
>  	if (!devtype) {
> @@ -183,6 +184,12 @@ struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output)
>  		return ERR_PTR(-EINVAL);
>  	}
>  
> +	res_len = res->end - res->start;
> +	if (!devm_request_mem_region(dev, res->start, res_len, "dcss")) {
> +		dev_err(dev, "cannot request memory region\n");
> +		return ERR_PTR(-EBUSY);
> +	}
> +
>  	dcss = kzalloc(sizeof(*dcss), GFP_KERNEL);
>  	if (!dcss)
>  		return ERR_PTR(-ENOMEM);
> -- 
> 2.43.0
>