linux-kernel - [PATCH v3 0/5] Add support for drm/rockchip to dynamically control the DDR frequency.

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Date:   Thu, 21 Mar 2019 19:14:35 -0400
From:   Gaël PORTAY <gael.portay@...labora.com>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Lin Huang <hl@...k-chips.com>,
        Brian Norris <briannorris@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Klaus Goger <klaus.goger@...obroma-systems.com>,
        Derek Basehore <dbasehore@...omium.org>,
        Randy Li <ayaka@...lik.info>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Cc:     Mark Rutland <mark.rutland@....com>,
        Gaël PORTAY <gael.portay@...labora.com>
Subject: [PATCH v3 0/5] Add support for drm/rockchip to dynamically control the DDR frequency.

Dear all,

The rk3399 platform has a DFI controller that can monitor DDR load and a
DMC driver that talks with the TF-A (Trusted Firmware-A) to dynamically
set the DDR frequency with following flow.

             kernel                          Trusted Firmware-A
                                                  (bl31)
        monitor ddr load
                |
                |
        get_target_rate
                |
                |           pass rate to TF-A
        clk_set_rate(ddr) --------------------->run ddr dvs flow
                                                    |
                                                    |
                 <------------------------------end ddr dvs flow
                |
                |
              return

These patches add support for devfreq to dynamically control the DDR
frequency into the drm rockchip driver. By default it uses the
'simple_ondemand' governor which can adjust the frequency based on the
DDR load.

Waiting for your feedback.

Best regards,
Gaël

Changes in v3:
- [PATCH v2 1/5] Add Signed-off-by: Gaël PORTAY <gael.portay@...labora.com>.
- [PATCH v2 2/5] Add Signed-off-by: Gaël PORTAY <gael.portay@...labora.com>.
- [PATCH v2 3/5] Add Signed-off-by: Gaël PORTAY <gael.portay@...labora.com>.
		 Remove comments.
		 Move pmu dt parsing after dt-parsing of timings to fix
		  data->odt_dis_freq value.
- [PATCH v2 5/5] Remove display_subsystem nodes.

Changes in v2:
- [PATCH 1/8] Really add Acked-by: Chanwoo Choi <cw00.choi@...sung.com>.
- [PATCH 4/8] Removed from patchset.
- [PATCH 5/8] Removed from patchset.
- [PATCH 6/8] Removed from patchset.
- [PATCH 7/8] Reword the commit message to reflect the removal of
              rk3390-dram-default-timing.dts in v1.
- [PATCH 8/8] Move center-supply attribute of dmc node in file
              rk3399-gru-chromebook.dtsi (where ppvar_centerlogic is
	      defined).

Changes in v1:
- [RFC 1/10] Add Acked-by: Chanwoo Choi <cw00.choi@...sung.com>
- [RFC 1/10] s/Generic/General/ (Robin Murphy)
- [RFC 2/10] Add reviewed and acked tags from Chanwoo Choi and Rob Herring
- [RFC 3/10] Add an explanation for platform SIP calls.
- [RFC 3/10] Change if statement for a switch.
- [RFC 3/10] Rename ddr_flag to odt_enable to be more clear.
- [RFC 4/10] Removed from the series. I did not found a use case where not holding the mutex causes the issue.
- [RFC 7/10] Removed from the series. I did not found a use case where this matters.
- [RFC 8/10] Move rk3399-dram.h to dt-includes.
- [RFC 8/10] Put sdram default values under the dmc node.
- [RFC 8/10] Removed rk3399-dram-default-timing.dts


Enric Balletbo i Serra (3):
  devfreq: rockchip-dfi: Move GRF definitions to a common place.
  dt-bindings: devfreq: rk3399_dmc: Add rockchip,pmu phandle.
  devfreq: rk3399_dmc: Pass ODT and auto power down parameters to TF-A.

Lin Huang (2):
  arm64: dts: rk3399: Add dfi and dmc nodes.
  arm64: dts: rockchip: Enable dmc and dfi nodes on gru.

 .../bindings/devfreq/rk3399_dmc.txt           |  2 +
 .../dts/rockchip/rk3399-gru-chromebook.dtsi   |  4 +
 arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi  | 16 ++++
 .../boot/dts/rockchip/rk3399-op1-opp.dtsi     | 29 ++++++++
 arch/arm64/boot/dts/rockchip/rk3399.dtsi      | 49 +++++++++++++
 drivers/devfreq/event/rockchip-dfi.c          | 23 ++----
 drivers/devfreq/rk3399_dmc.c                  | 71 +++++++++++++++++-
 include/dt-bindings/power/rk3399-dram.h       | 73 +++++++++++++++++++
 include/soc/rockchip/rk3399_grf.h             | 21 ++++++
 include/soc/rockchip/rockchip_sip.h           |  1 +
 10 files changed, 272 insertions(+), 17 deletions(-)
 create mode 100644 include/dt-bindings/power/rk3399-dram.h
 create mode 100644 include/soc/rockchip/rk3399_grf.h

-- 
2.21.0