linux-kernel - Re: [PATCH 02/11] drm/gma500: Use drm_aperture_remove_conflicting_pci

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Message-ID: <bad82927-1c58-4c2a-c265-571e10d1f67d@suse.de>
Date:   Thu, 12 Jan 2023 10:04:48 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Daniel Vetter <daniel.vetter@...ll.ch>,
        DRI Development <dri-devel@...ts.freedesktop.org>
Cc:     Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Daniel Vetter <daniel.vetter@...el.com>
Subject: Re: [PATCH 02/11] drm/gma500: Use
 drm_aperture_remove_conflicting_pci_framebuffers

Hi

Am 11.01.23 um 16:41 schrieb Daniel Vetter:
> This one nukes all framebuffers, which is a bit much. In reality
> gma500 is igpu and never shipped with anything discrete, so there should
> not be any difference.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
> ---
>   drivers/gpu/drm/gma500/psb_drv.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/gma500/psb_drv.c b/drivers/gpu/drm/gma500/psb_drv.c
> index cd9c73f5a64a..9b0daf90dc50 100644
> --- a/drivers/gpu/drm/gma500/psb_drv.c
> +++ b/drivers/gpu/drm/gma500/psb_drv.c
> @@ -429,7 +429,7 @@ static int psb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>   	 * TODO: Refactor psb_driver_load() to map vdc_reg earlier. Then we
>   	 *       might be able to read the framebuffer range from the device.
>   	 */
> -	ret = drm_aperture_remove_framebuffers(true, &driver);
> +	ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &driver);

This does not work. The comment just above the changed line explains 
why. The device uses shared memory similar to other integrated Intel 
chips. The console is somewhere in a 16 MiB range, which has been stolen 
by the BIOS from main memory. There's only a 1 MiB memory range on the 
device to program the device. Unless you want to refactor as described, 
this call has to cover the whole memory for now.

Best regards
Thomas

>   	if (ret)
>   		return ret;
>   

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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