linux-kernel - Re: [PATCH] drm/msm/adreno: Check for zap node availability

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Date: Sun, 19 May 2024 20:15:15 -0700
From: Bjorn Andersson <quic_bjorande@...cinc.com>
To: Rob Clark <robdclark@...il.com>
CC: <dri-devel@...ts.freedesktop.org>, <freedreno@...ts.freedesktop.org>,
        <linux-arm-msm@...r.kernel.org>, Rob Clark <robdclark@...omium.org>,
        "Nikita
 Travkin" <nikita@...n.ru>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        "Dmitry
 Baryshkov" <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        "Marijn Suijten" <marijn.suijten@...ainline.org>,
        David Airlie
	<airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Konrad Dybcio
	<konrad.dybcio@...aro.org>,
        Connor Abbott <cwabbott0@...il.com>,
        Ruan Jinjie
	<ruanjinjie@...wei.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm/adreno: Check for zap node availability

On Fri, May 17, 2024 at 12:50:19PM -0700, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
> 
> This should allow disabling the zap node via an overlay, for slbounce.
> 
> Suggested-by: Nikita Travkin <nikita@...n.ru>
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
>  drivers/gpu/drm/msm/adreno/adreno_gpu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> index d9ea15994ae9..a00241e3373b 100644
> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
> @@ -46,7 +46,7 @@ static int zap_shader_load_mdt(struct msm_gpu *gpu, const char *fwname,
>  	}
>  
>  	np = of_get_child_by_name(dev->of_node, "zap-shader");
> -	if (!np) {
> +	if (!np || !of_device_is_available(np)) {

	if (!of_device_is_available(np)) {

would cover both cases and be slightly cleaner imho...

But this looks reasonable either way.

Reviewed-by: Bjorn Andersson <quic_bjorande@...cinc.com>

Regards,
Bjorn

>  		zap_available = false;
>  		return -ENODEV;
>  	}
> -- 
> 2.45.1
>