linux-kernel - Re: [PATCH v2 05/14] drm/msm/adreno: Disable has_cached_coherent for A610/A619

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Date:   Fri, 17 Feb 2023 22:54:13 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-arm-msm@...r.kernel.org, andersson@...nel.org,
        agross@...nel.org
Cc:     marijn.suijten@...ainline.org, Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>,
        Chia-I Wu <olvaffe@...il.com>,
        Ricardo Ribalda <ribalda@...omium.org>,
        Nathan Chancellor <nathan@...nel.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 05/14] drm/msm/adreno: Disable has_cached_coherent for
 A610/A619_holi

On 14/02/2023 19:31, Konrad Dybcio wrote:
> These SKUs don't support the feature. Disable it to make the GPU stop
> crashing after almost each and every submission - the received data on
> the GPU end was simply incomplete in garbled, resulting in almost nothing
> being executed properly.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>   drivers/gpu/drm/msm/adreno/adreno_device.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c
> index 36f062c7582f..82757f005a1a 100644
> --- a/drivers/gpu/drm/msm/adreno/adreno_device.c
> +++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
> @@ -540,7 +540,13 @@ static int adreno_bind(struct device *dev, struct device *master, void *data)
>   		config.rev.minor, config.rev.patchid);
>   
>   	priv->is_a2xx = config.rev.core == 2;
> -	priv->has_cached_coherent = config.rev.core >= 6;
> +
> +	if (config.rev.core >= 6) {
> +		/* Exclude A610 and A619_holi */
> +		if (!(adreno_cmp_rev(ADRENO_REV(6, 1, 0, ANY_ID), config.rev) ||
> +		      adreno_cmp_rev(ADRENO_REV(6, 1, 9, 1), config.rev)))
> +			priv->has_cached_coherent = true;
> +	}

I'd suggest something like:

if (config.rev.core >= 6 &&
     !(info.quirks & ADRENO_QUIRK_NO_CACHE_COHERENT))
         priv->has_cache_coherent = true;

Let's keep all the information and quirks in a single place.

>   
>   	gpu = info->init(drm);
>   	if (IS_ERR(gpu)) {

-- 
With best wishes
Dmitry