Re: [PATCH 2/3] drm/xe/display: Avoid using stolen memory for framebuffer when media gt exists.

[Matthew Auld <matthew.auld@intel.com>]

On 30/06/2026 14:55, Maarten Lankhorst wrote:
> On systems with media GT, extra latency is added when accessing stolen
> memory when the GT is in MC6.
> 
> Simply disable allocating stolen memory for framebuffers when media gt
> is found.
> 
> Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/work_items/7513
> Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>
> ---
>   drivers/gpu/drm/xe/display/xe_display_bo.c | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/gpu/drm/xe/display/xe_display_bo.c b/drivers/gpu/drm/xe/display/xe_display_bo.c
> index 8953da0136dcb..677ae3af9ac0c 100644
> --- a/drivers/gpu/drm/xe/display/xe_display_bo.c
> +++ b/drivers/gpu/drm/xe/display/xe_display_bo.c
> @@ -131,6 +131,13 @@ bool xe_display_bo_fbdev_prefer_stolen(struct xe_device *xe, unsigned int size)
>   	if (IS_DGFX(xe))
>   		return false;
>   
> +	/*
> +	 * Avoid stolen memory when the media_gt exists,
> +	 * because a lot of latency is added when media gt is in MC6
> +	 */
> +	if (xe_device_get_root_tile(xe)->media_gt)
> +		return false;
> +
>   	if (XE_DEVICE_WA(xe, 22019338487_display))
>   		return false;

There is also the question for why this WA only applies to LNL, but the 
GT side of the WA applies even to PTL+, which seems highly suspect. 
Might be worth mentioning that in the commit. Also wondering if can now 
just drop 22019338487_display?

Also not sure if should just go with platform check here:

if (info.platform >= LNL)

?

Either way:
Reviewed-by: Matthew Auld <matthew.auld@intel.com>

>