linux-kernel - Re: [PATCH v4 3/7] drm: msm: a6xx: set gpu freq through hfi

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Date:   Thu, 9 Jul 2020 16:04:31 -0400
From:   Jonathan Marek <jonathan@...ek.ca>
To:     Akhil P Oommen <akhilpo@...eaurora.org>,
        freedreno@...ts.freedesktop.org
Cc:     dri-devel@...edesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, jcrouse@...eaurora.org,
        smasetty@...eaurora.org, devicetree@...r.kernel.org,
        mka@...omium.org, saravanak@...gle.com, sibis@...eaurora.org,
        viresh.kumar@...aro.org
Subject: Re: [PATCH v4 3/7] drm: msm: a6xx: set gpu freq through hfi

On 7/9/20 4:00 PM, Akhil P Oommen wrote:
> Newer targets support changing gpu frequency through HFI. So
> use that wherever supported instead of the legacy method.
> 

It was already using HFI on newer targets. Don't break it in one commit 
then fix it in the next.

> Signed-off-by: Akhil P Oommen <akhilpo@...eaurora.org>
> ---
>   drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 11 +++++++----
>   1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index 233afea..b547339 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -121,6 +121,12 @@ void a6xx_gmu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp)
>   		if (gpu_freq == gmu->gpu_freqs[perf_index])
>   			break;
>   
> +	if (!gmu->legacy) {
> +		a6xx_hfi_set_freq(gmu, gmu->current_perf_index);
> +		icc_set_bw(gpu->icc_path, 0, MBps_to_icc(7216));
> +		return;
> +	}
> +
>   	gmu->current_perf_index = perf_index;
>   	gmu->freq = gmu->gpu_freqs[perf_index];
>   
> @@ -893,10 +899,7 @@ int a6xx_gmu_resume(struct a6xx_gpu *a6xx_gpu)
>   	enable_irq(gmu->hfi_irq);
>   
>   	/* Set the GPU to the current freq */
> -	if (gmu->legacy)
> -		a6xx_gmu_set_initial_freq(gpu, gmu);
> -	else
> -		a6xx_hfi_set_freq(gmu, gmu->current_perf_index);
> +	a6xx_gmu_set_initial_freq(gpu, gmu);
>   
>   	/*
>   	 * "enable" the GX power domain which won't actually do anything but it
>