linux-kernel - Re: [PATCH v6] drm/msm/a6xx: Add support for an interconnect path

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Date:   Fri, 18 Jan 2019 13:52:20 -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>,
        Andy Gross <andy.gross@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Kees Cook <keescook@...omium.org>,
        Colin Ian King <colin.king@...onical.com>,
        Sharat Masetty <smasetty@...eaurora.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        Jonathan Marek <jonathan@...ek.ca>,
        Mamta Shukla <mamtashukla555@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Evan Green <evgreen@...omium.org>
Subject: Re: [PATCH v6] drm/msm/a6xx: Add support for an interconnect path

Hi,

On Fri, Jan 18, 2019 at 12:24 PM 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.
>
> v6: use icc_set_bw() instead of icc_set()
> 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(+)

Presumably this should go in together with the bindings:

- https://patchwork.kernel.org/patch/10739233/
- https://lkml.kernel.org/r/20181220173026.3857-3-jcrouse@codeaurora.org

...since bindings and code usually go in the same tree together.


As per discussion in v3 AKA v5
<https://patchwork.kernel.org/patch/10739231/>, we're trying to figure
out where to land this.  ;-)

-Doug