[Intel-gfx] [PATCH 1/8] drm/gma500: Use drm_aperture_remove_conflicting_pci_framebuffers

[Thomas Zimmermann]

Hi

Am 04.04.23 um 22:18 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.

I do own an Intel DN2800MT board with gma500 hardware. [1] It has a PCIe 
x1 slot. I never tried, but in principle, there could be another 
graphics card in the system. The linked spec say 'Discrete: None'. I 
don't know what that means exactly.

Best regards
Thomas

[1] 
https://ark.intel.com/content/www/us/en/ark/products/56455/intel-desktop-board-dn2800mt.html

> 
> v2: Unfortunately the framebuffer sits outside of the pci bars for
> gma500, and so only using the pci helpers won't be enough. Otoh if we
> only use non-pci helper, then we don't get the vga handling, and
> subsequent refactoring to untangle these special cases won't work.
> 
> It's not pretty, but the simplest fix (since gma500 really is the only
> quirky pci driver like this we have) is to just have both calls.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
> Cc: Patrik Jakobsson <patrik.r.jakobsson at gmail.com>
> Cc: Thomas Zimmermann <tzimmermann at suse.de>
> Cc: Javier Martinez Canillas <javierm at redhat.com>
> ---
>   drivers/gpu/drm/gma500/psb_drv.c | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/gma500/psb_drv.c b/drivers/gpu/drm/gma500/psb_drv.c
> index 2ce96b1b9c74..f1e0eed8fea4 100644
> --- a/drivers/gpu/drm/gma500/psb_drv.c
> +++ b/drivers/gpu/drm/gma500/psb_drv.c
> @@ -422,12 +422,17 @@ static int psb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>   
>   	/*
>   	 * We cannot yet easily find the framebuffer's location in memory. So
> -	 * remove all framebuffers here.
> +	 * remove all framebuffers here. Note that we still want the pci special
> +	 * handling to kick out vgacon.
>   	 *
>   	 * 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_framebuffers(false, &driver);
> +	if (ret)
> +		return ret;
> +
> +	ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &driver);
>   	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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