linux-kernel - [RFC v1 0/1] drm: lima: devfreq and cooling device support

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Date:   Sun, 15 Dec 2019 22:12:22 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     yuq825@...il.com, dri-devel@...ts.freedesktop.org,
        lima@...ts.freedesktop.org
Cc:     airlied@...ux.ie, daniel@...ll.ch, linux-kernel@...r.kernel.org,
        tomeu.vizoso@...labora.com, robh@...nel.org, steven.price@....com,
        alyssa.rosenzweig@...labora.com, linux-amlogic@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, wens@...e.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [RFC v1 0/1] drm: lima: devfreq and cooling device support

This is my attempt at adding devfreq (and cooling device) support to
the lima driver.
I didn't have much time to do in-depth testing. However, I'm sending
this out early because there are many SoCs with Mali-400/450 GPU so
I want to avoid duplicating the work with somebody else.

The code is derived from panfrost_devfreq.c which is why I kept the
Collabora copyright in lima_devfreq.c. Please let me know if I should
drop this or how I can make it more clear that I "borrowed" the code
from panfrost.

I am seeking comments in two general areas:
- regarding the integration into the existing lima code
- for the actual devfreq code (I had to adapt the panfrost code
  slightly, because lima uses a bus and a GPU/core clock)

My own TODO list includes "more" testing on various Amlogic SoCs.
So far I have tested this on Meson8b and Meson8m2 (which both have a
GPU OPP table defined). However, I still need to test this on a GXL
board (which is currently missing the GPU OPP table).

Martin Blumenstingl (1):
  drm/lima: Add optional devfreq support

 drivers/gpu/drm/lima/Kconfig        |   1 +
 drivers/gpu/drm/lima/Makefile       |   3 +-
 drivers/gpu/drm/lima/lima_devfreq.c | 162 ++++++++++++++++++++++++++++
 drivers/gpu/drm/lima/lima_devfreq.h |  15 +++
 drivers/gpu/drm/lima/lima_device.c  |   4 +
 drivers/gpu/drm/lima/lima_device.h  |  11 ++
 drivers/gpu/drm/lima/lima_drv.c     |  14 ++-
 drivers/gpu/drm/lima/lima_sched.c   |   7 ++
 drivers/gpu/drm/lima/lima_sched.h   |   3 +
 9 files changed, 217 insertions(+), 3 deletions(-)
 create mode 100644 drivers/gpu/drm/lima/lima_devfreq.c
 create mode 100644 drivers/gpu/drm/lima/lima_devfreq.h

-- 
2.24.1