linux-kernel - Re: [PATCH] drm/msm/a6xx: Correct the highestbank configuration

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Date:   Fri, 24 Jan 2020 11:26:54 -0700
From:   Jordan Crouse <jcrouse@...eaurora.org>
To:     Akhil P Oommen <akhilpo@...eaurora.org>
Cc:     freedreno@...ts.freedesktop.org, dri-devel@...edesktop.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        smasetty@...eaurora.org
Subject: Re: [PATCH] drm/msm/a6xx: Correct the highestbank configuration

On Fri, Jan 24, 2020 at 05:50:11PM +0530, Akhil P Oommen wrote:
> Highest bank bit configuration is different for a618 gpu. Update
> it with the correct configuration which is the reset value incidentally.
> 
> Signed-off-by: Akhil P Oommen <akhilpo@...eaurora.org>
> Signed-off-by: Sharat Masetty <smasetty@...eaurora.org>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index daf0780..536d196 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -470,10 +470,12 @@ static int a6xx_hw_init(struct msm_gpu *gpu)
>  	/* Select CP0 to always count cycles */
>  	gpu_write(gpu, REG_A6XX_CP_PERFCTR_CP_SEL_0, PERF_CP_ALWAYS_COUNT);
>  
> -	gpu_write(gpu, REG_A6XX_RB_NC_MODE_CNTL, 2 << 1);
> -	gpu_write(gpu, REG_A6XX_TPL1_NC_MODE_CNTL, 2 << 1);
> -	gpu_write(gpu, REG_A6XX_SP_NC_MODE_CNTL, 2 << 1);
> -	gpu_write(gpu, REG_A6XX_UCHE_MODE_CNTL, 2 << 21);
> +	if (adreno_is_a630(adreno_gpu)) {
> +		gpu_write(gpu, REG_A6XX_RB_NC_MODE_CNTL, 2 << 1);
> +		gpu_write(gpu, REG_A6XX_TPL1_NC_MODE_CNTL, 2 << 1);
> +		gpu_write(gpu, REG_A6XX_SP_NC_MODE_CNTL, 2 << 1);
> +		gpu_write(gpu, REG_A6XX_UCHE_MODE_CNTL, 2 << 21);
> +	}

it shouldn't come as a surprise that everything in the a6xx family is going to
have a highest bank bit setting. Even though the a618 uses the reset value, I
think it would be less confusing to future folks if we explicitly program it:

if (adreno_is_a630(adreno_dev))
  hbb = 2;
else
  hbb = 0;

....

Jordan

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