linux-kernel - Re: [PATCH 16/60] drm/imx/dcss: Add support for the nomodeset kernel parameter

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Message-ID: <1dece3a3593d271eaef7fa388957bc0ca6397851.camel@pengutronix.de>
Date:   Wed, 15 Dec 2021 10:20:31 +0100
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Javier Martinez Canillas <javierm@...hat.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc:     Laurentiu Palcu <laurentiu.palcu@....nxp.com>
Subject: Re: [PATCH 16/60] drm/imx/dcss: Add support for the nomodeset
 kernel parameter

Am Mittwoch, dem 15.12.2021 um 01:59 +0100 schrieb Javier Martinez Canillas:
> According to disable Documentation/admin-guide/kernel-parameters.txt, this
> parameter can be used to disable kernel modesetting.
> 
> DRM drivers will not perform display-mode changes or accelerated rendering
> and only the systewm system framebuffer will be available if it was set-up.
                    ^ typo in all the patches.
> 
> But only a few DRM drivers currently check for nomodeset, make this driver
> to also support the command line parameter.
> 
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>

Reviewed-by: Lucas Stach <l.stach@...gutronix.de>

> ---
> 
>  drivers/gpu/drm/imx/dcss/dcss-drv.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/imx/dcss/dcss-drv.c b/drivers/gpu/drm/imx/dcss/dcss-drv.c
> index 8dc2f85c514b..5be591da7389 100644
> --- a/drivers/gpu/drm/imx/dcss/dcss-drv.c
> +++ b/drivers/gpu/drm/imx/dcss/dcss-drv.c
> @@ -38,6 +38,9 @@ static int dcss_drv_platform_probe(struct platform_device *pdev)
>  	int err = 0;
>  	bool hdmi_output = true;
>  
> +	if (drm_firmware_drivers_only())
> +		return -ENODEV;
> +
>  	if (!dev->of_node)
>  		return -ENODEV;
>