linux-kernel - Re: [PATCH 5/6] drm: msm: a6xx: use dev_pm_opp_set

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200515010535.GX4525@google.com>
Date:   Thu, 14 May 2020 18:05:35 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Sharat Masetty <smasetty@...eaurora.org>
Cc:     freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        dri-devel@...edesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, jcrouse@...eaurora.org,
        georgi.djakov@...aro.org
Subject: Re: [PATCH 5/6] drm: msm: a6xx: use dev_pm_opp_set_bw to set DDR
 bandwidth

On Thu, May 14, 2020 at 04:24:18PM +0530, Sharat Masetty wrote:
> This patches replaces the previously used static DDR vote and uses
> dev_pm_opp_set_bw() to scale GPU->DDR bandwidth along with scaling
> GPU frequency.
> 
> Signed-off-by: Sharat Masetty <smasetty@...eaurora.org>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index 2d8124b..79433d3 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -141,11 +141,7 @@ void a6xx_gmu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp)
> 
>  	gmu->freq = gmu->gpu_freqs[perf_index];
> 
> -	/*
> -	 * Eventually we will want to scale the path vote with the frequency but
> -	 * for now leave it at max so that the performance is nominal.
> -	 */
> -	icc_set_bw(gpu->icc_path, 0, MBps_to_icc(7216));
> +	dev_pm_opp_set_bw(&gpu->pdev->dev, opp);

Is there a particular reason to keep this one liner in a separate patch?
I think it would make sense to squash it into "drm: msm: a6xx: send opp
instead of a frequency" and change the subject of the combined patch to
something like "drm: msm: a6xx: Scale the DDR bandwidth dynamically".