Re: [PATCH] drm/msm: enable separate_gpu_kms by default

[Dmitry Baryshkov]

On Mon, Feb 23, 2026 at 12:40:10AM +0530, Mahadevan P wrote:
> On targets with multiple display subsystems, such as SA8775P, the GPU
> binds to the first display subsystem that probes. This implicit binding
> prevents subsequent display subsystems from probing successfully,
> breaking multi-display support.
> 
> Enable separate_gpu_kms by default to decouple GPU and display subsystem
> probing. This allows each display subsystem to initialize independently,
> ensuring that all display subsystems are probed.
> 
> Signed-off-by: Mahadevan P <mahadevan.p@xxxxxxxxxxxxxxxx>
> ---
> Depends on:
> 	https://lore.kernel.org/lkml/20260124-adreno-module-table-v1-1-9c2dbb2638b4@xxxxxxxxxxxxxxxx/
> 	https://lore.kernel.org/all/20260217071420.2240380-1-mkuntuma@xxxxxxxxxxxxxxxx/

What exactly depends on this patchset?

> ---
>  drivers/gpu/drm/msm/msm_drv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index ed2a61c66ac9..65119fb3dfa2 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -54,7 +54,7 @@ static bool modeset = true;
>  MODULE_PARM_DESC(modeset, "Use kernel modesetting [KMS] (1=on (default), 0=disable)");
>  module_param(modeset, bool, 0600);
>  
> -static bool separate_gpu_kms;
> +static bool separate_gpu_kms = true;
>  MODULE_PARM_DESC(separate_gpu_drm, "Use separate DRM device for the GPU (0=single DRM device for both GPU and display (default), 1=two DRM devices)");
>  module_param(separate_gpu_kms, bool, 0400);

The patch LGTM, but I'd prefer to get confirmation from Rob.

BTW: have you tested it with X11? Are you still getting accelerated GPU?

-- 
With best wishes
Dmitry