linux-kernel - Re: [Freedreno] [PATCH] drm/msm: Fix the a650 hw

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Message-ID: <821c76c7-32dd-4914-817f-7f52843e9b1b@marek.ca>
Date:   Tue, 15 Sep 2020 12:01:03 -0400
From:   Jonathan Marek <jonathan@...ek.ca>
To:     Jordan Crouse <jcrouse@...eaurora.org>,
        linux-arm-msm@...r.kernel.org
Cc:     David Airlie <airlied@...ux.ie>, freedreno@...ts.freedesktop.org,
        Sharat Masetty <smasetty@...eaurora.org>,
        Akhil P Oommen <akhilpo@...eaurora.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Eric Anholt <eric@...olt.net>, Rob Clark <robdclark@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Sean Paul <sean@...rly.run>
Subject: Re: [Freedreno] [PATCH] drm/msm: Fix the a650 hw_apriv check

On 9/15/20 11:56 AM, Jordan Crouse wrote:
> Commit 604234f33658 ("drm/msm: Enable expanded apriv support for a650")
> was checking the result of adreno_is_a650() before the gpu revision
> got probed in adreno_gpu_init() so it was always coming across as
> false. Snoop into the revision ID ahead of time to correctly set the
> hw_apriv flag so that it can be used by msm_gpu to properly setup
> global buffers.
> 
> Fixes: 604234f33658 ("drm/msm: Enable expanded apriv support for a650")
> Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>

Tested-by: Jonathan Marek <jonathan@...ek.ca>

> ---
> 
>   drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 11 ++++++++++-
>   1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index 74bc27eb4203..f3b6d93c207c 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -1048,6 +1048,8 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
>   {
>   	struct msm_drm_private *priv = dev->dev_private;
>   	struct platform_device *pdev = priv->gpu_pdev;
> +	struct adreno_platform_config *config = pdev->dev.platform_data;
> +	const struct adreno_info *info;
>   	struct device_node *node;
>   	struct a6xx_gpu *a6xx_gpu;
>   	struct adreno_gpu *adreno_gpu;
> @@ -1064,7 +1066,14 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
>   	adreno_gpu->registers = NULL;
>   	adreno_gpu->reg_offsets = a6xx_register_offsets;
>   
> -	if (adreno_is_a650(adreno_gpu))
> +	/*
> +	 * We need to know the platform type before calling into adreno_gpu_init
> +	 * so that the hw_apriv flag can be correctly set. Snoop into the info
> +	 * and grab the revision number
> +	 */
> +	info = adreno_info(config->rev);
> +
> +	if (info && info->revn == 650)
>   		adreno_gpu->base.hw_apriv = true;
>   
>   	ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs, 1);
>