linux-kernel - Re: [RESEND PATCH v2] drm/mxsfb: Remove generic DRM drivers in probe function

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Message-ID: <1ea567f4-33c2-40a6-9bca-117e4daee8ef@suse.de>
Date: Thu, 5 Dec 2024 17:32:29 +0100
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Dario Binacchi <dario.binacchi@...rulasolutions.com>,
 linux-kernel@...r.kernel.org
Cc: linux-amarula@...rulasolutions.com,
 Michael Trimarchi <michael@...rulasolutions.com>,
 David Airlie <airlied@...il.com>, Fabio Estevam <festevam@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Marek Vasut <marex@...x.de>, Maxime Ripard <mripard@...nel.org>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Sascha Hauer <s.hauer@...gutronix.de>, Shawn Guo <shawnguo@...nel.org>,
 Simona Vetter <simona@...ll.ch>, Stefan Agner <stefan@...er.ch>,
 dri-devel@...ts.freedesktop.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [RESEND PATCH v2] drm/mxsfb: Remove generic DRM drivers in probe
 function




Am 05.12.24 um 17:24 schrieb Dario Binacchi:
> Use aperture helpers to remove all generic graphics drivers before
> loading mxsfb. Makes mxsfb compatible with simpledrm.
>
> Co-developed-by: Michael Trimarchi <michael@...rulasolutions.com>
> Signed-off-by: Michael Trimarchi <michael@...rulasolutions.com>
> Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>

Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>

>
> ---
>
> Changes in v2:
> - Use aperture_remove_all_conflicting_devices() instead of
>    drm_aperture_remove_framebuffers().
>
>   drivers/gpu/drm/mxsfb/mxsfb_drv.c | 10 ++++++++++
>   1 file changed, 10 insertions(+)
>
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> index 6b95e4eb3e4e..10da8b54f4c6 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> @@ -8,6 +8,7 @@
>    * Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved.
>    */
>   
> +#include <linux/aperture.h>
>   #include <linux/clk.h>
>   #include <linux/dma-mapping.h>
>   #include <linux/io.h>
> @@ -362,6 +363,15 @@ static int mxsfb_probe(struct platform_device *pdev)
>   	if (ret)
>   		goto err_free;
>   
> +	/*
> +	 * Remove early framebuffers (ie. simplefb). The framebuffer can be
> +	 * located anywhere in RAM
> +	 */
> +	ret = aperture_remove_all_conflicting_devices(mxsfb_driver.name);
> +	if (ret)
> +		return dev_err_probe(&pdev->dev, ret,
> +				     "can't kick out existing framebuffers\n");
> +
>   	ret = drm_dev_register(drm, 0);
>   	if (ret)
>   		goto err_unload;

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)