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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190508143546.GJ17077@art_vandelay>
Date:   Wed, 8 May 2019 10:35:46 -0400
From:   Sean Paul <sean@...rly.run>
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>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        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>

Reviewed-by: Sean Paul <sean@...rly.run>

> ---
>  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
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS