linux-kernel - Re: [PATCH v3 1/3] drm/msm/a6xx: Add support for an interconnect path

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Date:   Thu, 20 Dec 2018 11:28:15 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Jordan Crouse <jcrouse@...eaurora.org>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Clark <robdclark@...il.com>
Cc:     freedreno <freedreno@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Stephen Boyd <swboyd@...omium.org>,
        Kees Cook <keescook@...omium.org>,
        Sharat Masetty <smasetty@...eaurora.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Gross <andy.gross@...aro.org>,
        David Airlie <airlied@...ux.ie>,
        Johan Hovold <johan@...nel.org>,
        Colin Ian King <colin.king@...onical.com>
Subject: Re: [PATCH v3 1/3] drm/msm/a6xx: Add support for an interconnect path

Hi,

On Thu, Dec 20, 2018 at 9:30 AM Jordan Crouse <jcrouse@...eaurora.org> wrote:
>
> Try to get the interconnect path for the GPU and vote for the maximum
> bandwidth to support all frequencies. This is needed for performance.
> Later we will want to scale the bandwidth based on the frequency to
> also optimize for power but that will require some device tree
> infrastructure that does not yet exist.
>
> v5: Remove hardcoded interconnect name and just use the default
> v4: Don't use a port string at all to skip the need for names in the DT
> v3: Use macros and change port string per Georgi Djakov
>
> Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
> ---
>
>  drivers/gpu/drm/msm/Kconfig             |  1 +
>  drivers/gpu/drm/msm/adreno/a6xx_gmu.c   | 20 ++++++++++++++++++++
>  drivers/gpu/drm/msm/adreno/adreno_gpu.c |  9 +++++++++
>  drivers/gpu/drm/msm/msm_gpu.h           |  3 +++
>  4 files changed, 33 insertions(+)

There is very little difference between this an the previous version
[1].  Maybe could have kept Rob Clark's Acked-by?  The only change
was:

-       gpu->icc_path = of_icc_get(dev, "gfx-mem");
+       gpu->icc_path = of_icc_get(dev, NULL);

Also: I assume that this is still intended to go through Georgi's tree?

[1] https://lkml.kernel.org/r/20181207170656.13208-1-jcrouse@codeaurora.org

-Doug