From: Rob Clark <robdclark@gmail.com>
To: Sharat Masetty <smasetty@codeaurora.org>,
freedreno <freedreno@lists.freedesktop.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
dri-devel@freedesktop.org,
linux-arm-msm <linux-arm-msm@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Georgi Djakov <georgi.djakov@linaro.org>,
Matthias Kaehlcke <mka@chromium.org>
Subject: Re: [Freedreno] [PATCH 5/6] drm: msm: a6xx: use dev_pm_opp_set_bw to set DDR bandwidth
Date: Mon, 18 May 2020 09:25:41 -0700 [thread overview]
Message-ID: <CAF6AEGtoNwUGX-r7QytGn5hSU-VD4RJZyhcb3WdgAgAFR5BK4A@mail.gmail.com> (raw)
In-Reply-To: <20200518142333.GA10796@jcrouse1-lnx.qualcomm.com>
On Mon, May 18, 2020 at 7:23 AM Jordan Crouse <jcrouse@codeaurora.org> wrote:
>
> 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@codeaurora.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);
> > }
>
> This adds an implicit requirement that all targets need bandwidth settings
> defined in the OPP or they won't get a bus vote at all. I would prefer that
> there be an default escape valve but if not you'll need to add
> bandwidth values for the sdm845 OPP that target doesn't regress.
>
it looks like we could maybe do something like:
ret = dev_pm_opp_set_bw(...);
if (ret) {
dev_warn_once(dev, "no bandwidth settings");
icc_set_bw(...);
}
?
BR,
-R
> Jordan
>
> > unsigned long a6xx_gmu_get_freq(struct msm_gpu *gpu)
> > --
> > 2.7.4
> >
>
> --
> The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> a Linux Foundation Collaborative Project
> _______________________________________________
> Freedreno mailing list
> Freedreno@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/freedreno
next prev parent reply other threads:[~2020-05-18 16:25 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-14 10:54 [PATCH 0/6] Add support for GPU DDR BW scaling Sharat Masetty
2020-05-14 10:54 ` [PATCH 1/6] arm64: dts: qcom: sc7180: Add interconnect bindings for GPU Sharat Masetty
2020-05-14 23:37 ` Matthias Kaehlcke
2020-05-14 10:54 ` [PATCH 2/6] arm64: dts: qcom: sc7180: Add opp-peak-kBps to GPU opp Sharat Masetty
2020-05-14 23:45 ` Matthias Kaehlcke
2020-05-14 10:54 ` [PATCH 3/6] OPP: Add and export helper to set bandwidth Sharat Masetty
2020-05-15 0:32 ` Matthias Kaehlcke
2020-05-14 10:54 ` [PATCH 4/6] drm: msm: a6xx: send opp instead of a frequency Sharat Masetty
2020-05-15 0:39 ` Matthias Kaehlcke
2020-05-15 0:58 ` Matthias Kaehlcke
2020-05-14 10:54 ` [PATCH 5/6] drm: msm: a6xx: use dev_pm_opp_set_bw to set DDR bandwidth Sharat Masetty
2020-05-15 1:05 ` Matthias Kaehlcke
2020-05-18 14:23 ` Jordan Crouse
2020-05-18 16:25 ` Rob Clark [this message]
2020-05-27 8:47 ` [Freedreno] " Sharat Masetty
2020-05-27 15:38 ` Rob Clark
2020-05-27 17:31 ` Saravana Kannan
2020-05-27 20:41 ` Sibi Sankar
2020-05-27 20:51 ` Jordan Crouse
2020-05-28 11:02 ` Sharat Masetty
2020-05-14 10:54 ` [PATCH 6/6] dt-bindings: drm/msm/gpu: Document gpu opp table Sharat Masetty
2020-05-28 15:14 ` Rob Herring
2020-05-14 23:56 ` [PATCH 0/6] Add support for GPU DDR BW scaling Matthias Kaehlcke
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