linux-kernel - Re: [Freedreno] [PATCH 1/2] drm/msm: Fix a5xx/a6xx timestamps

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Date:   Fri, 2 Apr 2021 08:50:01 -0600
From:   Jordan Crouse <jordan@...micpenguin.net>
To:     Rob Clark <robdclark@...il.com>
Cc:     dri-devel@...ts.freedesktop.org,
        Rob Clark <robdclark@...omium.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <freedreno@...ts.freedesktop.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        David Airlie <airlied@...ux.ie>,
        Sam Ravnborg <sam@...nborg.org>,
        Sharat Masetty <smasetty@...eaurora.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Eric Anholt <eric@...olt.net>,
        "Kristian H. Kristensen" <hoegsberg@...gle.com>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Sean Paul <sean@...rly.run>,
        open list <linux-kernel@...r.kernel.org>,
        Emil Velikov <emil.velikov@...labora.com>
Subject: Re: [Freedreno] [PATCH 1/2] drm/msm: Fix a5xx/a6xx timestamps

On Wed, Mar 24, 2021 at 06:23:52PM -0700, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
> 
> They were reading a counter that was configured to ALWAYS_COUNT (ie.
> cycles that the GPU is doing something) rather than ALWAYS_ON.  This
> isn't the thing that userspace is looking for.

Acked-by: Jordan Crouse <jordan@...micpenguin.net>

> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
>  drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 4 ++--
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> index a5af223eaf50..bb82fcd9df81 100644
> --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> @@ -1241,8 +1241,8 @@ static int a5xx_pm_suspend(struct msm_gpu *gpu)
>  
>  static int a5xx_get_timestamp(struct msm_gpu *gpu, uint64_t *value)
>  {
> -	*value = gpu_read64(gpu, REG_A5XX_RBBM_PERFCTR_CP_0_LO,
> -		REG_A5XX_RBBM_PERFCTR_CP_0_HI);
> +	*value = gpu_read64(gpu, REG_A5XX_RBBM_ALWAYSON_COUNTER_LO,
> +		REG_A5XX_RBBM_ALWAYSON_COUNTER_HI);
>  
>  	return 0;
>  }
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index 130661898546..59718c304488 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -1173,8 +1173,8 @@ static int a6xx_get_timestamp(struct msm_gpu *gpu, uint64_t *value)
>  	/* Force the GPU power on so we can read this register */
>  	a6xx_gmu_set_oob(&a6xx_gpu->gmu, GMU_OOB_GPU_SET);
>  
> -	*value = gpu_read64(gpu, REG_A6XX_RBBM_PERFCTR_CP_0_LO,
> -		REG_A6XX_RBBM_PERFCTR_CP_0_HI);
> +	*value = gpu_read64(gpu, REG_A6XX_CP_ALWAYS_ON_COUNTER_LO,
> +		REG_A6XX_CP_ALWAYS_ON_COUNTER_HI);
>  
>  	a6xx_gmu_clear_oob(&a6xx_gpu->gmu, GMU_OOB_GPU_SET);
>  	return 0;
> -- 
> 2.29.2
> 
> _______________________________________________
> Freedreno mailing list
> Freedreno@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/freedreno

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