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

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Message-ID: <5fb2b696-b7b2-4e4c-8a46-6521b98843bd@suse.de>
Date: Thu, 24 Oct 2024 12:54:09 +0200
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: [PATCH] drm/mxsfb: Remove generic DRM drivers in probe function

Hi

Am 24.10.24 um 12:46 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>
>
> ---
>
>   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 cb5ce4e81fc7..a8d6dffcd02c 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> @@ -17,6 +17,7 @@
>   #include <linux/property.h>
>   #include <linux/pm_runtime.h>
>   
> +#include <drm/drm_aperture.h>
>   #include <drm/drm_atomic_helper.h>
>   #include <drm/drm_bridge.h>
>   #include <drm/drm_connector.h>
> @@ -360,6 +361,15 @@ 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 = drm_aperture_remove_framebuffers(&mxsfb_driver);

This function has been removed recently. Call 
aperture_remove_all_conflicting_devices() instead. You can use 
msxfb_driver.name for the argument.

[1] 
https://elixir.bootlin.com/linux/v6.11.5/source/include/linux/aperture.h#L57

Best regards
Thomas

> +	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)