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Thu, 2 Jul 2020 17:37:46 +0100 (BST) Received: from eusmtrp1.samsung.com (unknown [182.198.249.138]) by eucas1p2.samsung.com (KnoxPortal) with ESMTPA id 20200702163746eucas1p2363251b3b6fb6084123cedd67fa132d5~d-NxZPRal2646326463eucas1p2i; Thu, 2 Jul 2020 16:37:46 +0000 (GMT) Received: from eusmgms1.samsung.com (unknown [182.198.249.179]) by eusmtrp1.samsung.com (KnoxPortal) with ESMTP id 20200702163746eusmtrp118c2d8325d59fa423234d57a9276acf9~d-NxYffo21333013330eusmtrp1k; Thu, 2 Jul 2020 16:37:46 +0000 (GMT) X-AuditID: cbfec7f5-38bff700000018ae-45-5efe0d5a798b Received: from eusmtip2.samsung.com ( [203.254.199.222]) by eusmgms1.samsung.com (EUCPMTA) with SMTP id FC.9B.06314.A5D0EFE5; Thu, 2 Jul 2020 17:37:46 +0100 (BST) Received: from AMDC3061.digital.local (unknown [106.120.51.75]) by eusmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200702163745eusmtip2c9eb3169ca506724fb79dd5218c7d0e4~d-NwqGR5g2242122421eusmtip2h; Thu, 2 Jul 2020 16:37:45 +0000 (GMT) From: Sylwester Nawrocki To: georgi.djakov@linaro.org, cw00.choi@samsung.com, krzk@kernel.org Cc: devicetree@vger.kernel.org, robh+dt@kernel.org, a.swigon@samsung.com, myungjoo.ham@samsung.com, inki.dae@samsung.com, sw0312.kim@samsung.com, b.zolnierkie@samsung.com, m.szyprowski@samsung.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, s.nawrocki@samsung.com Subject: [PATCH RFC v6 0/6] Exynos: Simple QoS for exynos-bus using interconnect Date: Thu, 2 Jul 2020 18:37:18 +0200 Message-Id: <20200702163724.2218-1-s.nawrocki@samsung.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA01SbUhTYRjl3b27u65uXK+SD6YVy7CCNNPozSwq/DHwjxRGGFpLbyo6lU0r +1HWmN+FKOQ0LRNTmZVzqZilia2WWVpYKula4LSU7IMpkZ+5Xfv4d57znPM+58BLE9w7sSed kJzGq5IVSTJKSrY8+9W3PZJZjN7RPLATW29oEW7UNYjx4PQnMb5p6hXjtzPfKFzSbqRwkbWQ xH19Bgk2jg6IcX9bOYXtV0wI6/o6RPiuySLBw5fqKKxtN0nwky/ZYqwrnqAOuMqN+lxKPjLw iJJb880i+f3qi/KrTXoktxvXh1OR0pBYPinhDK/y339SGl9j/ypKzfc5V/96nspENd55yIUG NgjyOicleUhKc2wdgvaCQSQM0wjMSwuUMNgR3FvUEnmIdlpqKn0FvhbBg6xx4q/jo8FCON6l 2AC48vQqcmB3NhSyxm6QDhHB5hDQ0lrkFLmxhyGn6rHIgUl2M/Rr50WOCwwbDL3fg4R8G6De 0OmUM6wrdJfaSAcmlnlN83XnYWDfS+CW8bNEMITCVNYgErAbTJqbVngv6CkuIAWDBkHBw2GJ MBQisJorVxx7YaR3lnKkINit0NDmL9AHocJSvlJ/DQxNuQoh1kBRS8kKzUBOFieofWBOXyIS sCfk25ZIActBX1rn7MKxUTBWMUQVoo1l/1Ur+69a2b8MlYjQIw8+Xa2M49WByfxZP7VCqU5P jvOLSVEa0fJn61k0z7SijvlTXYilkWw187l7IZoTK86oM5RdCGhC5s4cetUTzTGxiozzvCrl hCo9iVd3oXU0KfNgAqsmojg2TpHGJ/J8Kq/6sxXRLp6Z6Jp0oEnT9mKu373bUG46zr0xXKgb 7diSHeoZFJ+bu+nIy1sfdp+WBZPzjN+BCO/9FlX19x/htt3PbV4/TSENq/Y1Jkb3NrnrNLqv yoN30mc711t3pd62VR0LO9rwQVOb6WsJ45YgQDse3jI4FlLvm7IponChYk/M2uKEqBpRt8dl GamOVwRsI1RqxW8rOVu8aAMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrHIsWRmVeSWpSXmKPExsVy+t/xe7pRvP/iDLYsFbO4P6+V0WLjjPWs Fte/PGe1mH/kHKvFla/v2Sym793EZjHp/gQWi/PnN7BbbHp8jdXi8q45bBafe48wWsw4v4/J Yu2Ru+wWtxtXsFm07j3CbnH4TTurxYzJL9kcBD02repk87hzbQ+bx/3u40wem5fUe/RtWcXo 8XmTXABblJ5NUX5pSapCRn5xia1StKGFkZ6hpYWekYmlnqGxeayVkamSvp1NSmpOZllqkb5d gl7Gss/vmAq6VSpWX/jD1sC4TLaLkYNDQsBEYtkC9S5GLg4hgaWMEhe332CCiEtJzG9R6mLk BDKFJf5c62KDqPnEKLFr+ic2kASbgKFE79E+RhBbRMBD4lTrWlYQm1lgBrPE6VmmILawQIDE gWOXmEBsFgFVicutf8Dm8wpYSZz7YAIxX15i9YYDzCA2r4CgxMmZT1hASpgF1CXWzxOCmCgv 0bx1NvMERv5ZSKpmIVTNQlK1gJF5FaNIamlxbnpusaFecWJucWleul5yfu4mRmDcbTv2c/MO xksbgw8xCnAwKvHwTjj+N06INbGsuDL3EKMEB7OSCK/T2dNxQrwpiZVVqUX58UWlOanFhxhN gT6YyCwlmpwPTAl5JfGGpobmFpaG5sbmxmYWSuK8HQIHY4QE0hNLUrNTUwtSi2D6mDg4pRoY J3q388nfXL62N0gtesE5dlktYx1FVz7Wvz9nCH3f9n7jFKlGz9Dqip6nbOEP13rwllc8yFA8 fJ75nNiXO++Vdk6YHK/lKaszw+5sh0y87r93M5e9yCn2Xmm5ejXvh/sai7XaulV9fZbPnDP5 VZ/yun2H33FXv7AuD021a+hpEJRkv8n5gT9RiaU4I9FQi7moOBEAgL/8XdECAAA= X-CMS-MailID: 20200702163746eucas1p2363251b3b6fb6084123cedd67fa132d5 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20200702163746eucas1p2363251b3b6fb6084123cedd67fa132d5 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200702163746eucas1p2363251b3b6fb6084123cedd67fa132d5 References: Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org This patchset adds interconnect API support for the Exynos SoC "samsung, exynos-bus" compatible devices, which already have their corresponding exynos-bus driver in the devfreq subsystem. Complementing the devfreq driver with an interconnect functionality allows to ensure the QoS requirements of devices accessing the system memory (e.g. video processing devices) are fulfilled and aallows to avoid issues like the one discussed in thread [1]. This patch series adds implementation of the interconnect provider per each "samsung,exynos-bus" compatible DT node, with one interconnect node per provider. The interconnect code which was previously added as a part of the devfreq driver has been converted to a separate platform driver. In the devfreq a corresponding virtual child platform device is registered. Integration of devfreq and interconnect frameworks is achieved through the PM QoS API. A sample interconnect consumer for exynos-mixer is added in patches 5/6, 6/6, it is currently added only for exynos4412 and allows to address the mixer DMA underrun error issues [1]. Main changes since v5 [3] is an addition of "bus-width: DT property, which specifies data width of the interconnect bus (patches 1...2/6 and addition of synchronization of the interconnect bandwidth setting with VSYNC (patch 6/6). The series has been tested on Odroid U3 board. It is based on icc-next branch, which already includes required patches [2]: 26c205e interconnect: Allow inter-provider pairs to be configured 0db4ee05 interconnect: Relax requirement in of_icc_get_from_provider() 6998a7c interconnect: Export of_icc_get_from_provider() -- Regards, Sylwester Changes since v3 [4] (v4 skipped to align with patchset [1]), detailed changes are listed in each patch: - conversion to a separate interconnect (platform) driver, - an update of the DT binding documenting new optional properties: #interconnect-cells, samsung,interconnect-parent in "samsung,exynos-bus" nodes, - new DT properties added to the SoC, rather than to the board specific files. Changes since v2 [5]: - Use icc_std_aggregate(). - Implement a different modification of apply_constraints() in drivers/interconnect/core.c (patch 03). - Use 'exynos,interconnect-parent-node' in the DT instead of 'devfreq'/'parent', depending on the bus. - Rebase on DT patches that deprecate the 'devfreq' DT property. - Improve error handling, including freeing generated IDs on failure. - Remove exynos_bus_icc_connect() and add exynos_bus_icc_get_parent(). Changes since v1 [6]: - Rebase on coupled regulators patches. - Use dev_pm_qos_*() API instead of overriding frequency in exynos_bus_target(). - Use IDR for node ID allocation. - Reverse order of multiplication and division in mixer_set_memory_bandwidth() (patch 07) to avoid integer overflow. References: [1] https://patchwork.kernel.org/patch/10861757/ (original issue) [2] https://www.spinics.net/lists/linux-samsung-soc/msg70014.html [3] https://www.spinics.net/lists/arm-kernel/msg810722.html [4] https://lore.kernel.org/linux-pm/20191220115653.6487-1-a.swigon@samsung.com [5] https://patchwork.kernel.org/cover/11054417/ (v1 of this RFC) [6] https://patchwork.kernel.org/cover/11152595/ (v2 of this RFC) Artur Świgoń (1): ARM: dts: exynos: Add interconnects to Exynos4412 mixer Sylwester Nawrocki (5): dt-bindings: exynos-bus: Add documentation for interconnect properties interconnect: Add generic interconnect driver for Exynos SoCs PM / devfreq: exynos-bus: Add registration of interconnect child device ARM: dts: exynos: Add interconnect properties to Exynos4412 bus nodes drm: exynos: mixer: Add interconnect support .../devicetree/bindings/devfreq/exynos-bus.txt | 68 +++++++- arch/arm/boot/dts/exynos4412.dtsi | 7 + drivers/devfreq/exynos-bus.c | 17 ++ drivers/gpu/drm/exynos/exynos_mixer.c | 150 +++++++++++++++- drivers/interconnect/Kconfig | 1 + drivers/interconnect/Makefile | 1 + drivers/interconnect/exynos/Kconfig | 6 + drivers/interconnect/exynos/Makefile | 4 + drivers/interconnect/exynos/exynos.c | 192 +++++++++++++++++++++ 9 files changed, 436 insertions(+), 10 deletions(-) create mode 100644 drivers/interconnect/exynos/Kconfig create mode 100644 drivers/interconnect/exynos/Makefile create mode 100644 drivers/interconnect/exynos/exynos.c -- 2.7.4