linux-kernel - Re: [PATCH] drm/msm/a6xx: No zap shader is not an error

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Date:   Wed, 8 May 2019 09:29:30 -0600
From:   Jordan Crouse <jcrouse@...eaurora.org>
To:     Rob Clark <robdclark@...il.com>
Cc:     dri-devel@...ts.freedesktop.org,
        Rob Clark <robdclark@...omium.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sharat Masetty <smasetty@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/a6xx: No zap shader is not an error

On Wed, May 08, 2019 at 06:06:52AM -0700, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
> 
> Depending on platform firmware, a zap shader may not be required to take
> the GPU out of secure mode on boot, in which case we can just write
> RBBM_SECVID_TRUST_CNTL directly.  Which we *mostly* handled, but missed
> clearing 'ret' resulting that hw_init() returned an error on these
> devices.
> 
> Fixes: abccb9fe3267 drm/msm/a6xx: Add zap shader load
> Signed-off-by: Rob Clark <robdclark@...omium.org>

Woo, I'm glad we finally got a chance to verify this on both types of systems.

Acked-by: Jordan Crouse <jcrouse@...eaurora.org>

> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index ec24508b9d68..e74dce474250 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -527,6 +527,7 @@ static int a6xx_hw_init(struct msm_gpu *gpu)
>  		dev_warn_once(gpu->dev->dev,
>  			"Zap shader not enabled - using SECVID_TRUST_CNTL instead\n");
>  		gpu_write(gpu, REG_A6XX_RBBM_SECVID_TRUST_CNTL, 0x0);
> +		ret = 0;
>  	}
>  
>  out:
> -- 
> 2.20.1
> 

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