Linux-PM Archive on lore.kernel.org
 help / color / Atom feed
From: Leonard Crestez <leonard.crestez@nxp.com>
To: Stephen Boyd <sboyd@kernel.org>,
	MyungJoo Ham <myungjoo.ham@samsung.com>,
	Kyungmin Park <kyungmin.park@samsung.com>,
	Rob Herring <robh+dt@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
	"Shawn Guo" <shawnguo@kernel.org>,
	"Chanwoo Choi" <cw00.choi@samsung.com>,
	"Mark Rutland" <mark.rutland@arm.com>,
	"Michael Turquette" <mturquette@baylibre.com>,
	"Artur Świgoń" <a.swigon@partner.samsung.com>,
	"Saravana Kannan" <saravanak@google.com>,
	"Angus Ainslie" <angus@akkea.ca>,
	"Martin Kepplinger" <martink@posteo.de>,
	"Matthias Kaehlcke" <mka@chromium.org>,
	"Krzysztof Kozlowski" <krzk@kernel.org>,
	"Alexandre Bailon" <abailon@baylibre.com>,
	"Georgi Djakov" <georgi.djakov@linaro.org>,
	"Dong Aisheng" <aisheng.dong@nxp.com>,
	"Abel Vesa" <abel.vesa@nxp.com>, "Jacky Bai" <ping.bai@nxp.com>,
	"Anson Huang" <Anson.Huang@nxp.com>,
	"Fabio Estevam" <fabio.estevam@nxp.com>,
	"Viresh Kumar" <viresh.kumar@linaro.org>,
	devicetree@vger.kernel.org, linux-pm@vger.kernel.org,
	linux-clk@vger.kernel.org, linux-imx@nxp.com,
	kernel@pengutronix.de, linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4 0/6] PM / devfreq: Add dynamic scaling for imx8m ddr controller
Date: Sat,  9 Nov 2019 00:39:50 +0200
Message-ID: <cover.1573252696.git.leonard.crestez@nxp.com> (raw)

This adds support for dynamic scaling of the DDR Controller (ddrc) present in
imx8m series. Actual frequency switching is implemented inside TF-A, this
driver wraps the SMC calls and synchronizes the clk tree.

DRAM frequency switching requires clock manipulation but during this operation
DRAM itself is briefly inaccessible so this operation is performed a SMC call
to by TF-A which runs from a SRAM area. Upon returning to linux the clock tree
is updated to correspond to hardware configuration.

This is handled via CLK_GET_RATE_NO_CACHE for dividers but muxes are handled
manually: the driver will prepare/enable the new parents ahead of switching (so
that the expected roots are enabled) and afterwards it will call clk_set_parent
to ensure the parents in clock framework are up-to-date.

This series is atomically useful and roughly similar to devfreq drivers for
tegra and rockchip.

Running at lower dram rates saves power but can affect the functionality of
other blocks in the chip (display, vpu etc). Support for in-kernel constraints
will some separately.

Angus/Martin: You previously attempted to test on purism boards, this updated
version should work without hacks and has no dependencies.

Changes since v3:
* Rename to imx8m-ddrc. Similar blocks are present on imx7d and imx8qxp/imx8qm
but soc integration is different.
* Move dt bindings to /memory-controllers/fsl/
* Fix dt validation issues
* Fix imx8mm.dtsi ddrc referencing ddrc_opp_table which is only defined in evk
* Move opps to child of ddrc device node
* Only add imx_ddrc_get_dev_status in perf patch.
* Adjust print messages
Link to v3: https://patchwork.kernel.org/cover/11221935/

Leonard Crestez (6):
  clk: imx8m: Set CLK_GET_RATE_NOCACHE on dram clocks
  clk: imx: Mark dram pll on 8mm and 8mn with CLK_GET_RATE_NOCACHE
  dt-bindings: memory: Add bindings for imx8m ddr controller
  PM / devfreq: Add dynamic scaling for imx8m ddr controller
  PM / devfreq: imx8m-ddrc: Measure bandwidth with perf
  arm64: dts: imx8m: Add ddr controller nodes

 .../memory-controllers/fsl/imx8m-ddrc.yaml    |  61 ++
 arch/arm64/boot/dts/freescale/imx8mm-evk.dts  |  18 +
 arch/arm64/boot/dts/freescale/imx8mm.dtsi     |  13 +-
 .../boot/dts/freescale/imx8mn-ddr4-evk.dts    |  18 +
 arch/arm64/boot/dts/freescale/imx8mn.dtsi     |  13 +-
 arch/arm64/boot/dts/freescale/imx8mq-evk.dts  |  24 +
 arch/arm64/boot/dts/freescale/imx8mq.dtsi     |  13 +-
 drivers/clk/imx/clk-imx8mm.c                  |  13 +-
 drivers/clk/imx/clk-imx8mn.c                  |  14 +-
 drivers/clk/imx/clk-imx8mq.c                  |  15 +-
 drivers/clk/imx/clk-pll14xx.c                 |   7 +
 drivers/clk/imx/clk.h                         |   1 +
 drivers/devfreq/Kconfig                       |  10 +
 drivers/devfreq/Makefile                      |   1 +
 drivers/devfreq/imx8m-ddrc.c                  | 569 ++++++++++++++++++
 15 files changed, 777 insertions(+), 13 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/memory-controllers/fsl/imx8m-ddrc.yaml
 create mode 100644 drivers/devfreq/imx8m-ddrc.c

-- 
2.17.1


             reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-08 22:39 Leonard Crestez [this message]
2019-11-08 22:39 ` [PATCH v4 1/6] clk: imx8m: Set CLK_GET_RATE_NOCACHE on dram clocks Leonard Crestez
2019-11-12 11:18   ` Abel Vesa
2019-11-12 13:43     ` Leonard Crestez
2019-11-12 15:10       ` Abel Vesa
2019-11-08 22:39 ` [PATCH v4 2/6] clk: imx: Mark dram pll on 8mm and 8mn with CLK_GET_RATE_NOCACHE Leonard Crestez
2019-11-12 11:18   ` Abel Vesa
2019-11-08 22:39 ` [PATCH v4 3/6] dt-bindings: memory: Add bindings for imx8m ddr controller Leonard Crestez
2019-11-08 22:39 ` [PATCH v4 4/6] PM / devfreq: Add dynamic scaling " Leonard Crestez
2019-11-11  3:23   ` Chanwoo Choi
2019-11-11 17:23     ` Leonard Crestez
2019-11-12  1:00       ` Chanwoo Choi
2019-11-12 14:47         ` Leonard Crestez
2019-11-08 22:39 ` [PATCH v4 5/6] PM / devfreq: imx8m-ddrc: Measure bandwidth with perf Leonard Crestez
2019-11-11  5:18   ` Chanwoo Choi
2019-11-12 13:17     ` Leonard Crestez
2019-11-13  1:43       ` Chanwoo Choi
2019-11-08 22:39 ` [PATCH v4 6/6] arm64: dts: imx8m: Add ddr controller nodes Leonard Crestez

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=cover.1573252696.git.leonard.crestez@nxp.com \
    --to=leonard.crestez@nxp.com \
    --cc=Anson.Huang@nxp.com \
    --cc=a.swigon@partner.samsung.com \
    --cc=abailon@baylibre.com \
    --cc=abel.vesa@nxp.com \
    --cc=aisheng.dong@nxp.com \
    --cc=angus@akkea.ca \
    --cc=cw00.choi@samsung.com \
    --cc=devicetree@vger.kernel.org \
    --cc=fabio.estevam@nxp.com \
    --cc=georgi.djakov@linaro.org \
    --cc=kernel@pengutronix.de \
    --cc=krzk@kernel.org \
    --cc=kyungmin.park@samsung.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-clk@vger.kernel.org \
    --cc=linux-imx@nxp.com \
    --cc=linux-pm@vger.kernel.org \
    --cc=mark.rutland@arm.com \
    --cc=martink@posteo.de \
    --cc=mka@chromium.org \
    --cc=mturquette@baylibre.com \
    --cc=myungjoo.ham@samsung.com \
    --cc=ping.bai@nxp.com \
    --cc=rjw@rjwysocki.net \
    --cc=robh+dt@kernel.org \
    --cc=saravanak@google.com \
    --cc=sboyd@kernel.org \
    --cc=shawnguo@kernel.org \
    --cc=viresh.kumar@linaro.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-PM Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-pm/0 linux-pm/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-pm linux-pm/ https://lore.kernel.org/linux-pm \
		linux-pm@vger.kernel.org
	public-inbox-index linux-pm

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-pm


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git