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Thu, 2 Jul 2020 16:37:48 +0000 (GMT) From: Sylwester Nawrocki To: georgi.djakov@linaro.org, cw00.choi@samsung.com, krzk@kernel.org Subject: [PATCH RFC v6 1/6] dt-bindings: exynos-bus: Add documentation for interconnect properties Date: Thu, 2 Jul 2020 18:37:19 +0200 Message-Id: <20200702163724.2218-2-s.nawrocki@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200702163724.2218-1-s.nawrocki@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA02SaUiUURSGufOtTk59jpYHjdKhhIpS0eBiFhVDzY+giIgItCb9UMl1Rk3t R5m55N44panZJmQziNO4lJZSOrngBuWGCwNqi6WImYot2oyflv+ec8773vccuCwh7aWc2JDw aF4VrgyV0WKypnmxa6+fZMnfY2BpAzaXJCP8vKCCwv0/PlP4gamLwj1z0zTOrzfSWGPOJXF3 t4HBxrE+Cn+oK6bxbJYJ4YLuBhEuN40weCixjMbJ9SYGN02mUrggb4I+bKcw6m7RiuG+17TC nNEiUlSWXlNkV+mQYta47RR9XuwbyIeGxPIq90MXxcGaol8oMtslrsNsZq6jG07pyIYFzhta /zTTVpZyZQj6tb7pSGzhHwimBrVIKGYtRc8gWnOk6+7TwuApgsmOcvTPclvzjrGqaM4Tst5l rzgcODmkfCwhrSKCSyOg5qWGsA7suUDoG9OsiEhuJ7xYvL+yiITzgdba6dW47aA3vLHoWdaG OwBNsxJBYgdt98ZJKxMWSVJ1EWF9H7gZBhJTpla9chgZMTEC28PXlqpV3grteZmkYEhCkPlq iBGKXATmloer7gMw3PWTtiYT3C6oqHMX2kfAsFwrsraB2wgDU3bCEhtBU5NPCG0JpKVIBfUO +KXLFwnsBBnjy6TACkhLTmRykWvhunMK151T+D/3ISJ0yJGPUYcF8WqvcP7KPrUyTB0THrQv ICLMiCyfrX2pZe4lavh9qRFxLJLZSr60/fGXUspYdXxYIwKWkDlIjna2+0slgcr4BF4VcUEV E8qrG5EzS8ocJV6PJ/ykXJAymr/M85G8am0qYm2crqNiMdTH629QZzZvGdDemWuoq1wK0cpL bE+oRkXi6bpgfdT7+axzMz4i54DT2Q8Wvnu/lp9Mvfmo/5O3flNOhcebnK49zzyXx9r2z5VW fot6wg4SPT4+bm6j/Z1vr7pkGOYPxukdjt35Hnx8YbLX9ayBsrl7ulCujUnPc6ytMlYnEDJS Haz03E2o1Mq/eMkMX2gDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrOIsWRmVeSWpSXmKPExsVy+t/xe7oxvP/iDC5v0rW4P6+V0WLjjPWs Fte/PGe1mH/kHKvFla/v2Sym793EZjHp/gQWi/PnN7BbbHp8jdXi8q45bBafe48wWsw4v4/J Yu2Ru+wWtxtXsFm07j3CbnH4TTurxYzJL9kcBD02repk87hzbQ+bx/3u40wem5fUe/RtWcXo 8XmTXABblJ5NUX5pSapCRn5xia1StKGFkZ6hpYWekYmlnqGxeayVkamSvp1NSmpOZllqkb5d gl7GpNm/GQv6FCrO3L/P3sDYJNXFyMkhIWAi0bVqLlsXIxeHkMBSRok7u94DORxACSmJ+S1K EDXCEn+udUHVfGKU2Lp1FytIgk3AUKL3aB8jiC0i4CFxqnUtWJxZYAazxOlZpiC2sECSxIfF P5hBbBYBVYntP0GWcXLwClhJnNj5nhFigbzE6g0HmEH2cgpYSxz+zAsSFgIqOda/gB2iXFDi 5MwnLCAlzALqEuvnCUFskpdo3jqbeQKj4CwkVbMQqmYhqVrAyLyKUSS1tDg3PbfYSK84Mbe4 NC9dLzk/dxMjMFK3Hfu5ZQdj17vgQ4wCHIxKPLwTjv+NE2JNLCuuzD3EKMHBrCTC63T2dJwQ b0piZVVqUX58UWlOavEhRlOgzyYyS4km5wOTSF5JvKGpobmFpaG5sbmxmYWSOG+HwMEYIYH0 xJLU7NTUgtQimD4mDk6pBsY5tzZ0//U/ZxWyaK3rJoukKPXWPW6VWjyBTQ/+FSia/v5ntFve +fCSQsaF6x4wxmoYWgjH3VynULDFelK0/ZXWS51GbeY/blnaGzd/3Myx5Knf/xyhEzIbJBm0 j2a0e6XnFXoW7u1tK3oSdFbxfl+ypfZF1hOqkvIHebeWNUxNeLjCM8aMWYmlOCPRUIu5qDgR AG44LafqAgAA X-CMS-MailID: 20200702163748eucas1p2cf7eab70bc072dea9a95183018b38ad3 X-Msg-Generator: CA X-RootMTR: 20200702163748eucas1p2cf7eab70bc072dea9a95183018b38ad3 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200702163748eucas1p2cf7eab70bc072dea9a95183018b38ad3 References: <20200702163724.2218-1-s.nawrocki@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200702_123750_732131_BA70A4CF X-CRM114-Status: GOOD ( 15.83 ) X-Spam-Score: -5.2 (-----) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-5.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [210.118.77.11 listed in wl.mailspike.net] -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [210.118.77.11 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, b.zolnierkie@samsung.com, linux-pm@vger.kernel.org, sw0312.kim@samsung.com, a.swigon@samsung.com, robh+dt@kernel.org, linux-kernel@vger.kernel.org, inki.dae@samsung.com, myungjoo.ham@samsung.com, dri-devel@lists.freedesktop.org, s.nawrocki@samsung.com, linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Add documentation for new optional properties in the exynos bus nodes: samsung,interconnect-parent, #interconnect-cells, bus-width. These properties allow to specify the SoC interconnect structure which then allows the interconnect consumer devices to request specific bandwidth requirements. Signed-off-by: Artur Świgoń Signed-off-by: Sylwester Nawrocki Acked-by: Chanwoo Choi --- Changes for v6: - added dts example of bus hierarchy definition and the interconnect consumer, - added new bus-width property. Changes for v5: - exynos,interconnect-parent-node renamed to samsung,interconnect-parent --- .../devicetree/bindings/devfreq/exynos-bus.txt | 68 +++++++++++++++++++++- 1 file changed, 66 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/devfreq/exynos-bus.txt b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt index e71f752..4035e3e 100644 --- a/Documentation/devicetree/bindings/devfreq/exynos-bus.txt +++ b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt @@ -51,6 +51,13 @@ Optional properties only for parent bus device: - exynos,saturation-ratio: the percentage value which is used to calibrate the performance count against total cycle count. +Optional properties for interconnect functionality (QoS frequency constraints): +- samsung,interconnect-parent: phandle to the parent interconnect node; for + passive devices should point to same node as the exynos,parent-bus property. +- #interconnect-cells: should be 0. +- bus-width: the interconnect bus width in bits, default value is 8 when this + property is missing. + Detailed correlation between sub-blocks and power line according to Exynos SoC: - In case of Exynos3250, there are two power line as following: VDD_MIF |--- DMC @@ -135,7 +142,7 @@ Detailed correlation between sub-blocks and power line according to Exynos SoC: |--- PERIC (Fixed clock rate) |--- FSYS (Fixed clock rate) -Example1: +Example 1: Show the AXI buses of Exynos3250 SoC. Exynos3250 divides the buses to power line (regulator). The MIF (Memory Interface) AXI bus is used to transfer data between DRAM and CPU and uses the VDD_MIF regulator. @@ -184,7 +191,7 @@ Example1: |L5 |200000 |200000 |400000 |300000 | ||1000000 | ---------------------------------------------------------- -Example2 : +Example 2: The bus of DMC (Dynamic Memory Controller) block in exynos3250.dtsi is listed below: @@ -419,3 +426,60 @@ Example2 : devfreq = <&bus_leftbus>; status = "okay"; }; + +Example 3: + An interconnect path "bus_display -- bus_leftbus -- bus_dmc" on + Exynos4412 SoC with video mixer as an interconnect consumer device. + + soc { + bus_dmc: bus_dmc { + compatible = "samsung,exynos-bus"; + clocks = <&clock CLK_DIV_DMC>; + clock-names = "bus"; + operating-points-v2 = <&bus_dmc_opp_table>; + bus-width = <4>; + #interconnect-cells = <0>; + status = "disabled"; + }; + + bus_leftbus: bus_leftbus { + compatible = "samsung,exynos-bus"; + clocks = <&clock CLK_DIV_GDL>; + clock-names = "bus"; + operating-points-v2 = <&bus_leftbus_opp_table>; + samsung,interconnect-parent = <&bus_dmc>; + #interconnect-cells = <0>; + status = "disabled"; + }; + + bus_display: bus_display { + compatible = "samsung,exynos-bus"; + clocks = <&clock CLK_ACLK160>; + clock-names = "bus"; + operating-points-v2 = <&bus_display_opp_table>; + samsung,interconnect-parent = <&bus_leftbus>; + #interconnect-cells = <0>; + status = "disabled"; + }; + + bus_dmc_opp_table: opp_table1 { + compatible = "operating-points-v2"; + /* ... */ + } + + bus_leftbus_opp_table: opp_table3 { + compatible = "operating-points-v2"; + /* ... */ + }; + + bus_display_opp_table: opp_table4 { + compatible = "operating-points-v2"; + /* .. */ + }; + + &mixer { + compatible = "samsung,exynos4212-mixer"; + interconnects = <&bus_display &bus_dmc>; + /* ... */ + }; + }; From patchwork Thu Jul 2 16:37:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Sylwester Nawrocki/Kernel \\(PLT\\) /SRPOL/Staff Engineer/Samsung Electronics" X-Patchwork-Id: 11639679 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C15C213B6 for ; 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Thu, 2 Jul 2020 16:37:52 +0000 (GMT) From: Sylwester Nawrocki To: georgi.djakov@linaro.org, cw00.choi@samsung.com, krzk@kernel.org Subject: [PATCH RFC v6 2/6] interconnect: Add generic interconnect driver for Exynos SoCs Date: Thu, 2 Jul 2020 18:37:20 +0200 Message-Id: <20200702163724.2218-3-s.nawrocki@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200702163724.2218-1-s.nawrocki@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrGKsWRmVeSWpSXmKPExsWy7djP87qJvP/iDM481ba4P6+V0WLjjPWs Fte/PGe1mH/kHKvFla/v2Sym793EZjHp/gQWi/PnN7BbbHp8jdXi8q45bBafe48wWsw4v4/J Yu2Ru+wWtxtXsFm07j3CbnH4TTurxYzJL9kcBD02repk87hzbQ+bx/3u40wem5fUe/RtWcXo 8XmTXABbFJdNSmpOZllqkb5dAlfGvp+32QsWeFd8f72CrYFxvn0XIyeHhICJxIyHsxm7GLk4 hARWMEosmfWAGcL5wigx5doRdgjnM6PE4skv2WFaXje9ZYFILGeU2H5xCRtcy9Stp9lAqtgE DCV6j/YxgtgiAi4SbU/ngXUwC3QwS2zbMYkZJCEsEC2xdOlWsLEsAqoSJ4+eYwKxeQWsJObu XscMsU5eYvWGA0A2BwengLXE4c+8ECWCEidnPmEBsZmBSpq3zga7W0LgK7vEn0u7mSB6XSQW 32iDOltY4tXxLVC2jMTpyT0sEA3NjBI9u2+zQzgTGCXuH1/ACFFlLXHn3C82kM3MApoS63fp Q4QdJf4v7QYLSwjwSdx4KwhxBJ/EpG3TmSHCvBIdbUIQ1SoSv1dNhzpHSqL7yX8WCNtDYvGv dsYJjIqzkLwzC8k7sxD2LmBkXsUonlpanJueWmyUl1quV5yYW1yal66XnJ+7iRGY2k7/O/5l B+OuP0mHGAU4GJV4eCcc/xsnxJpYVlyZe4hRgoNZSYTX6ezpOCHelMTKqtSi/Pii0pzU4kOM 0hwsSuK8xotexgoJpCeWpGanphakFsFkmTg4pRoYc3S/1p7re+hnsJWDoelC1NdTP5pYHues UN77UVFQtm/yoT1XP+n/u88e8twuN5S7XmqlnVXngpxZT3Iyd/efiRfex6P1NWPZp0csJkun ftlVyPT/zqL4wFN8c4M9FYNcWywMt2RdtKu7eEDxVqUDR9y+VdF8jqt2NPCvf/ZbR3d/9ETT k1+ZlViKMxINtZiLihMBQaqzhGkDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrOIsWRmVeSWpSXmKPExsVy+t/xe7qJvP/iDP794bW4P6+V0WLjjPWs Fte/PGe1mH/kHKvFla/v2Sym793EZjHp/gQWi/PnN7BbbHp8jdXi8q45bBafe48wWsw4v4/J Yu2Ru+wWtxtXsFm07j3CbnH4TTurxYzJL9kcBD02repk87hzbQ+bx/3u40wem5fUe/RtWcXo 8XmTXABblJ5NUX5pSapCRn5xia1StKGFkZ6hpYWekYmlnqGxeayVkamSvp1NSmpOZllqkb5d gl7Gvp+32QsWeFd8f72CrYFxvn0XIyeHhICJxOumtyxdjFwcQgJLGSWu3FzH1MXIAZSQkpjf ogRRIyzx51oXG0TNJ0aJdRuaGEESbAKGEr1H+8BsEQEPiVOta1lBbGaBGcwSp2eZgtjCApES b37tYAKxWQRUJU4ePQdm8wpYSczdvY4ZYoG8xOoNB5hB9nIKWEsc/swLEhYCKjnWv4AdolxQ 4uTMJywgJcwC6hLr5wlBbJKXaN46m3kCo+AsJFWzEKpmIalawMi8ilEktbQ4Nz232EivODG3 uDQvXS85P3cTIzBStx37uWUHY9e74EOMAhyMSjy8E47/jRNiTSwrrsw9xCjBwawkwut09nSc EG9KYmVValF+fFFpTmrxIUZToM8mMkuJJucDk0heSbyhqaG5haWhubG5sZmFkjhvh8DBGCGB 9MSS1OzU1ILUIpg+Jg5OqQbGhXmZ8T1FZ8usA4oUZ6VOudlztPFKRdnFkLect9ndE5y6LoX+ 9V3xbPbcVVwKPnuPJTNmVHcv+3rY4k/mB32zFsEzsc1cB234TPtaFiglSb6Ne2bani70fcnj p8ui5YpjTRVeq5csdDw/cevrqwsOu93dKmXvdCHsWmcOS5PYM32Tky6V5ZJKLMUZiYZazEXF iQClnxQ56gIAAA== X-CMS-MailID: 20200702163753eucas1p16fbd5d59d05fb8e4fdcde9df839cb71e X-Msg-Generator: CA X-RootMTR: 20200702163753eucas1p16fbd5d59d05fb8e4fdcde9df839cb71e X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200702163753eucas1p16fbd5d59d05fb8e4fdcde9df839cb71e References: <20200702163724.2218-1-s.nawrocki@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200702_123756_179959_A922998E X-CRM114-Status: GOOD ( 28.97 ) X-Spam-Score: -5.2 (-----) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-5.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [210.118.77.12 listed in list.dnswl.org] 0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [210.118.77.12 listed in wl.mailspike.net] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, b.zolnierkie@samsung.com, linux-pm@vger.kernel.org, sw0312.kim@samsung.com, a.swigon@samsung.com, robh+dt@kernel.org, linux-kernel@vger.kernel.org, inki.dae@samsung.com, myungjoo.ham@samsung.com, dri-devel@lists.freedesktop.org, s.nawrocki@samsung.com, linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org This patch adds a generic interconnect driver for Exynos SoCs in order to provide interconnect functionality for each "samsung,exynos-bus" compatible device. The SoC topology is a graph (or more specifically, a tree) and its edges are specified using the 'samsung,interconnect-parent' in the DT. Due to unspecified relative probing order, -EPROBE_DEFER may be propagated to ensure that the parent is probed before its children. Each bus is now an interconnect provider and an interconnect node as well (cf. Documentation/interconnect/interconnect.rst), i.e. every bus registers itself as a node. Node IDs are not hardcoded but rather assigned dynamically at runtime. This approach allows for using this driver with various Exynos SoCs. Frequencies requested via the interconnect API for a given node are propagated to devfreq using dev_pm_qos_update_request(). Please note that it is not an error when CONFIG_INTERCONNECT is 'n', in which case all interconnect API functions are no-op. The bus-width DT property is to determine the interconnect data width and traslate requested bandwidth to clock frequency for each bus. Signed-off-by: Artur Świgoń Signed-off-by: Sylwester Nawrocki --- Changes for v6: - corrected of_node dereferencing in exynos_icc_get_parent() function, - corrected initialization of icc_node->name so as to avoid direct of_node->name dereferencing, - added parsing of bus-width DT property, - use IS_ERR_OR_NULL in exynos_icc_genberic_remove(). Changes for v5: - adjust to renamed exynos,interconnect-parent-node property, - use automatically generated platform device id as the interconect node id instead of a now unavailable devfreq->id field, - add icc_ prefix to some variables to make the code more self-commenting, - use icc_nodes_remove() instead of icc_node_del() + icc_node_destroy(), - adjust to exynos,interconnect-parent-node property rename to samsung,interconnect-parent, - converted to a separate platform driver in drivers/interconnect. --- drivers/interconnect/Kconfig | 1 + drivers/interconnect/Makefile | 1 + drivers/interconnect/exynos/Kconfig | 6 ++ drivers/interconnect/exynos/Makefile | 4 + drivers/interconnect/exynos/exynos.c | 192 +++++++++++++++++++++++++++++++++++ 5 files changed, 204 insertions(+) create mode 100644 drivers/interconnect/exynos/Kconfig create mode 100644 drivers/interconnect/exynos/Makefile create mode 100644 drivers/interconnect/exynos/exynos.c diff --git a/drivers/interconnect/Kconfig b/drivers/interconnect/Kconfig index 5b7204e..eca6eda 100644 --- a/drivers/interconnect/Kconfig +++ b/drivers/interconnect/Kconfig @@ -11,6 +11,7 @@ menuconfig INTERCONNECT if INTERCONNECT +source "drivers/interconnect/exynos/Kconfig" source "drivers/interconnect/imx/Kconfig" source "drivers/interconnect/qcom/Kconfig" diff --git a/drivers/interconnect/Makefile b/drivers/interconnect/Makefile index 4825c28..2ba1de6 100644 --- a/drivers/interconnect/Makefile +++ b/drivers/interconnect/Makefile @@ -4,5 +4,6 @@ CFLAGS_core.o := -I$(src) icc-core-objs := core.o obj-$(CONFIG_INTERCONNECT) += icc-core.o +obj-$(CONFIG_INTERCONNECT_EXYNOS) += exynos/ obj-$(CONFIG_INTERCONNECT_IMX) += imx/ obj-$(CONFIG_INTERCONNECT_QCOM) += qcom/ diff --git a/drivers/interconnect/exynos/Kconfig b/drivers/interconnect/exynos/Kconfig new file mode 100644 index 0000000..e51e52e --- /dev/null +++ b/drivers/interconnect/exynos/Kconfig @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0-only +config INTERCONNECT_EXYNOS + tristate "Exynos generic interconnect driver" + depends on ARCH_EXYNOS || COMPILE_TEST + help + Generic interconnect driver for Exynos SoCs. diff --git a/drivers/interconnect/exynos/Makefile b/drivers/interconnect/exynos/Makefile new file mode 100644 index 0000000..e19d1df --- /dev/null +++ b/drivers/interconnect/exynos/Makefile @@ -0,0 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0 +exynos-interconnect-objs := exynos.o + +obj-$(CONFIG_INTERCONNECT_EXYNOS) += exynos-interconnect.o diff --git a/drivers/interconnect/exynos/exynos.c b/drivers/interconnect/exynos/exynos.c new file mode 100644 index 0000000..6c47a62 --- /dev/null +++ b/drivers/interconnect/exynos/exynos.c @@ -0,0 +1,192 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Exynos generic interconnect provider driver + * + * Copyright (c) 2020 Samsung Electronics Co., Ltd. + * + * Authors: Artur Świgoń + * Sylwester Nawrocki + */ +#include +#include +#include +#include +#include +#include + +#define EXYNOS_ICC_DEFAULT_BUS_WIDTH 8 + +struct exynos_icc_priv { + struct device *dev; + + /* One interconnect node per provider */ + struct icc_provider provider; + struct icc_node *node; + + struct dev_pm_qos_request qos_req; + u32 bus_width; +}; + +static struct icc_node *exynos_icc_get_parent(struct device_node *np) +{ + struct of_phandle_args args; + struct icc_node *icc_np; + int num, ret; + + num = of_count_phandle_with_args(np, "samsung,interconnect-parent", + "#interconnect-cells"); + if (num != 1) + return NULL; /* parent nodes are optional */ + + ret = of_parse_phandle_with_args(np, "samsung,interconnect-parent", + "#interconnect-cells", 0, &args); + if (ret < 0) + return ERR_PTR(ret); + + icc_np = of_icc_get_from_provider(&args); + of_node_put(args.np); + + return icc_np; +} + +static int exynos_generic_icc_set(struct icc_node *src, struct icc_node *dst) +{ + struct exynos_icc_priv *src_priv = src->data, *dst_priv = dst->data; + s32 src_freq = max(src->avg_bw, src->peak_bw) / src_priv->bus_width; + s32 dst_freq = max(dst->avg_bw, dst->peak_bw) / dst_priv->bus_width; + int ret; + + ret = dev_pm_qos_update_request(&src_priv->qos_req, src_freq); + if (ret < 0) { + dev_err(src_priv->dev, "failed to update PM QoS of %s\n", + src->name); + return ret; + } + + ret = dev_pm_qos_update_request(&dst_priv->qos_req, dst_freq); + if (ret < 0) { + dev_err(dst_priv->dev, "failed to update PM QoS of %s\n", + dst->name); + return ret; + } + + return 0; +} + +static struct icc_node *exynos_generic_icc_xlate(struct of_phandle_args *spec, + void *data) +{ + struct exynos_icc_priv *priv = data; + + if (spec->np != priv->dev->parent->of_node) + return ERR_PTR(-EINVAL); + + return priv->node; +} + +static int exynos_generic_icc_remove(struct platform_device *pdev) +{ + struct exynos_icc_priv *priv = platform_get_drvdata(pdev); + struct icc_node *parent_node, *node = priv->node; + + parent_node = exynos_icc_get_parent(priv->dev->parent->of_node); + if (!IS_ERR_OR_NULL(parent_node)) + icc_link_destroy(node, parent_node); + + icc_nodes_remove(&priv->provider); + icc_provider_del(&priv->provider); + + return 0; +} + +static int exynos_generic_icc_probe(struct platform_device *pdev) +{ + struct device *bus_dev = pdev->dev.parent; + struct exynos_icc_priv *priv; + struct icc_provider *provider; + struct icc_node *icc_node, *icc_parent_node; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = &pdev->dev; + platform_set_drvdata(pdev, priv); + + provider = &priv->provider; + + provider->set = exynos_generic_icc_set; + provider->aggregate = icc_std_aggregate; + provider->xlate = exynos_generic_icc_xlate; + provider->dev = bus_dev; + provider->inter_set = true; + provider->data = priv; + + ret = icc_provider_add(provider); + if (ret < 0) + return ret; + + icc_node = icc_node_create(pdev->id); + if (IS_ERR(icc_node)) { + ret = PTR_ERR(icc_node); + goto err_prov_del; + } + + priv->node = icc_node; + icc_node->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOFn", + bus_dev->of_node); + if (of_property_read_u32(bus_dev->of_node, "bus-width", + &priv->bus_width)) + priv->bus_width = EXYNOS_ICC_DEFAULT_BUS_WIDTH; + + icc_node->data = priv; + icc_node_add(icc_node, provider); + + icc_parent_node = exynos_icc_get_parent(bus_dev->of_node); + if (IS_ERR(icc_parent_node)) { + ret = PTR_ERR(icc_parent_node); + goto err_node_del; + } + if (icc_parent_node) { + ret = icc_link_create(icc_node, icc_parent_node->id); + if (ret < 0) + goto err_node_del; + } + + /* + * Register a PM QoS request for the bus device for which also devfreq + * functionality is registered. + */ + ret = dev_pm_qos_add_request(bus_dev, &priv->qos_req, + DEV_PM_QOS_MIN_FREQUENCY, 0); + if (ret < 0) + goto err_link_destroy; + + return 0; + +err_link_destroy: + if (icc_parent_node) + icc_link_destroy(icc_node, icc_parent_node); +err_node_del: + icc_nodes_remove(provider); +err_prov_del: + icc_provider_del(provider); + + return ret; +} + +static struct platform_driver exynos_generic_icc_driver = { + .driver = { + .name = "exynos-generic-icc", + }, + .probe = exynos_generic_icc_probe, + .remove = exynos_generic_icc_remove, +}; +module_platform_driver(exynos_generic_icc_driver); + +MODULE_DESCRIPTION("Exynos generic interconnect driver"); +MODULE_AUTHOR("Artur Świgoń "); +MODULE_AUTHOR("Sylwester Nawrocki "); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:exynos-generic-icc"); From patchwork Thu Jul 2 16:37:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Sylwester Nawrocki/Kernel \\(PLT\\) /SRPOL/Staff Engineer/Samsung Electronics" X-Patchwork-Id: 11639671 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0617914B7 for ; Thu, 2 Jul 2020 16:39:28 +0000 (UTC) Received: from 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(BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200702_123756_638754_B3553645 X-CRM114-Status: GOOD ( 17.18 ) X-Spam-Score: -5.2 (-----) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-5.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [210.118.77.11 listed in wl.mailspike.net] -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [210.118.77.11 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, b.zolnierkie@samsung.com, linux-pm@vger.kernel.org, sw0312.kim@samsung.com, a.swigon@samsung.com, robh+dt@kernel.org, linux-kernel@vger.kernel.org, inki.dae@samsung.com, myungjoo.ham@samsung.com, dri-devel@lists.freedesktop.org, s.nawrocki@samsung.com, linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org This patch adds registration of a child platform device for the exynos interconnect driver. It is assumed that the interconnect provider will only be needed when #interconnect-cells property is present in the bus DT node, hence the child device will be created only when such a property is present. Signed-off-by: Sylwester Nawrocki Acked-by: Chanwoo Choi --- Changes for v6: - none. Changes for v5: - new patch. --- drivers/devfreq/exynos-bus.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) -- 2.7.4 diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c index 8fa8eb5..856e37d 100644 --- a/drivers/devfreq/exynos-bus.c +++ b/drivers/devfreq/exynos-bus.c @@ -24,6 +24,7 @@ struct exynos_bus { struct device *dev; + struct platform_device *icc_pdev; struct devfreq *devfreq; struct devfreq_event_dev **edev; @@ -156,6 +157,8 @@ static void exynos_bus_exit(struct device *dev) if (ret < 0) dev_warn(dev, "failed to disable the devfreq-event devices\n"); + platform_device_unregister(bus->icc_pdev); + dev_pm_opp_of_remove_table(dev); clk_disable_unprepare(bus->clk); if (bus->opp_table) { @@ -168,6 +171,8 @@ static void exynos_bus_passive_exit(struct device *dev) { struct exynos_bus *bus = dev_get_drvdata(dev); + platform_device_unregister(bus->icc_pdev); + dev_pm_opp_of_remove_table(dev); clk_disable_unprepare(bus->clk); } @@ -431,6 +436,18 @@ static int exynos_bus_probe(struct platform_device *pdev) if (ret < 0) goto err; + /* Create child platform device for the interconnect provider */ + if (of_get_property(dev->of_node, "#interconnect-cells", NULL)) { + bus->icc_pdev = platform_device_register_data( + dev, "exynos-generic-icc", + PLATFORM_DEVID_AUTO, NULL, 0); + + if (IS_ERR(bus->icc_pdev)) { + ret = PTR_ERR(bus->icc_pdev); + goto err; + } + } + max_state = bus->devfreq->profile->max_state; min_freq = (bus->devfreq->profile->freq_table[0] / 1000); max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000); From patchwork Thu Jul 2 16:37:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Sylwester Nawrocki/Kernel \\(PLT\\) /SRPOL/Staff Engineer/Samsung Electronics" X-Patchwork-Id: 11639673 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with 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51.AB.06314.46D0EFE5; Thu, 2 Jul 2020 17:37:56 +0100 (BST) Received: from AMDC3061.digital.local (unknown [106.120.51.75]) by eusmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200702163755eusmtip28bd1b5471bd6ae156a0378be19d6b8b0~d-N6FBRho2919929199eusmtip2B; Thu, 2 Jul 2020 16:37:55 +0000 (GMT) From: Sylwester Nawrocki To: georgi.djakov@linaro.org, cw00.choi@samsung.com, krzk@kernel.org Subject: [PATCH RFC v6 4/6] ARM: dts: exynos: Add interconnect properties to Exynos4412 bus nodes Date: Thu, 2 Jul 2020 18:37:22 +0200 Message-Id: <20200702163724.2218-5-s.nawrocki@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200702163724.2218-1-s.nawrocki@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA02SazBUYRjH591z2WNnl2O3yYPS2DKNpsRomnfSmGpMsx/7SFNqy5kldtMe l/KhCxEbtfGBVkUXk7YLNkkKtVZbI3ZMSEMpMWhSoU10dTq6fPs9z/P/v//nmXkZQvmU8mMS DCmc0aBNUtMysu7hjGsVp/gRG3olCA+cy0a4pqSKws8+jVC4zNFB4S73BxoXN9poXDhgJrHL 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201P X-CMS-RootMailID: 20200702163756eucas1p282c6bc5a61f8dd7b6a5d59d92e92e2f1 References: <20200702163724.2218-1-s.nawrocki@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200702_123758_620743_A6D559A1 X-CRM114-Status: GOOD ( 11.93 ) X-Spam-Score: -5.2 (-----) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-5.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [210.118.77.11 listed in wl.mailspike.net] -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [210.118.77.11 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, b.zolnierkie@samsung.com, linux-pm@vger.kernel.org, sw0312.kim@samsung.com, a.swigon@samsung.com, robh+dt@kernel.org, linux-kernel@vger.kernel.org, inki.dae@samsung.com, myungjoo.ham@samsung.com, dri-devel@lists.freedesktop.org, s.nawrocki@samsung.com, linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org This patch adds the following properties for Exynos4412 interconnect bus nodes: - samsung,interconnect-parent: to declare connections between nodes in order to guarantee PM QoS requirements between nodes, - #interconnect-cells: required by the interconnect framework, - bus-width: the bus width in bits, required to properly derive minimum bus clock frequency from requested bandwidth for each bus. Note that #interconnect-cells is always zero and node IDs are not hardcoded anywhere. Signed-off-by: Artur Świgoń Signed-off-by: Sylwester Nawrocki Reviewed-by: Chanwoo Choi --- Changes for v6: - added bus-width property in bus_dmc node. Changes for v5: - adjust to renamed exynos,interconnect-parent-node property, - add properties in common exynos4412.dtsi file rather than in Odroid specific odroid4412-odroid-common.dtsi. --- arch/arm/boot/dts/exynos4412.dtsi | 6 ++++++ 1 file changed, 6 insertions(+) -- 2.7.4 diff --git a/arch/arm/boot/dts/exynos4412.dtsi b/arch/arm/boot/dts/exynos4412.dtsi index 4886894..24529d4 100644 --- a/arch/arm/boot/dts/exynos4412.dtsi +++ b/arch/arm/boot/dts/exynos4412.dtsi @@ -381,6 +381,8 @@ clocks = <&clock CLK_DIV_DMC>; clock-names = "bus"; operating-points-v2 = <&bus_dmc_opp_table>; + bus-width = <4>; + #interconnect-cells = <0>; status = "disabled"; }; @@ -450,6 +452,8 @@ clocks = <&clock CLK_DIV_GDL>; clock-names = "bus"; operating-points-v2 = <&bus_leftbus_opp_table>; + samsung,interconnect-parent = <&bus_dmc>; + #interconnect-cells = <0>; status = "disabled"; }; @@ -466,6 +470,8 @@ clocks = <&clock CLK_ACLK160>; clock-names = "bus"; operating-points-v2 = <&bus_display_opp_table>; + samsung,interconnect-parent = <&bus_leftbus>; + #interconnect-cells = <0>; status = "disabled"; }; From patchwork Thu Jul 2 16:37:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Sylwester Nawrocki/Kernel \\(PLT\\) /SRPOL/Staff Engineer/Samsung Electronics" X-Patchwork-Id: 11639675 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0240D14B7 for ; Thu, 2 Jul 2020 16:39:43 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CDCF4207D4 for ; Thu, 2 Jul 2020 16:39:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="c+uXgMZG"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="SkFRU1po" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CDCF4207D4 Authentication-Results: mail.kernel.org; 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Thu, 2 Jul 2020 16:37:57 +0000 (GMT) From: Sylwester Nawrocki To: georgi.djakov@linaro.org, cw00.choi@samsung.com, krzk@kernel.org Subject: [PATCH RFC v6 5/6] ARM: dts: exynos: Add interconnects to Exynos4412 mixer Date: Thu, 2 Jul 2020 18:37:23 +0200 Message-Id: <20200702163724.2218-6-s.nawrocki@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200702163724.2218-1-s.nawrocki@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA01Se0hTcRTmt3t3d10tr1PwYNJj5B891MzCHzkie8D+qBBBoiht6m2aTm1X LfdHbytbiqjko7B3iVHa0lHWVOZqmuQkXUUayxe5yAVtJlpazrse/33nO993vnPg0IS0VxhE p2XmsJpMZYaMEpOGF1PW0IOS2YS1122A7TUFCD+srBfit+5PQnzV3C3EfRNfKVxh1FO41F5C Yqu1QYT1w2+EuLf5CoVdRWaEK60tAnzf/EGE+0/WUrjAaBbh9i/nhLiyzEFt9lPo6wopxcCb Z5TCrrMIFI9uHVcUN9YhhUu/JJbaK5ansBlpeawmfNMBceq98mPZRfRR3eSeE2iIuoB8aGDW Q890EXkBiWkpU4tAV95C8YUbQVNbq4AvXAhaB43CP5Y7BZe8lrsI+p8Mkn8tbluHyKOimAgo el6MPDiA2QZnR2vmRQRzngDD41LC0/Bn4sHRPjQ/lmRCYKamcJ6XMBuh1jYu4uOWwr2Gtjme pn2YaGh3SXiJH3RWjZAeTMxJTjddJjzzgRkXgfuj2+vdBvfPOEke+8NnS6OXD4ausoskbziN 4OLTfhFflCCwW64hXhUNA93TlCeZYFZCfXO4BwITAx12NQ8XwbtxP36HRVBqqCB4WgLnz0r5 GSvgR12FgMdBoBv55d1GAbVlk4IStLz6v2uq/7um+l/sNUTUoUA2l1OrWC4ykz0SxinVXG6m Kiw5S61Hc6/WNWuZeIxafiaZEEMj2ULJWOdMglSozOPy1SYENCELkGx51ZUglaQo87WsJitR k5vBcia0mCZlgZLIG479UkalzGHTWTab1fzpCmifoBOIKWk0v6wvDpdTocZdx5NWhGstC4LF vuQ+o0OeWvWa3l0adsOZHvGt+vDtvo5lcRvytvjKU9es21NlitrB7TQQ1pj0eEqV/GDml8kY dCo2zhnVHaP+MZT//tTNAVqbaKBXjw6PTTmfLJk9NKS0fb8aGZKicZQzPYR4wrI1a7tWRnKp yohVhIZT/gZWTv82ZgMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrKIsWRmVeSWpSXmKPExsVy+t/xe7ppvP/iDFr7mC3uz2tltNg4Yz2r xfUvz1kt5h85x2px5et7NovpezexWUy6P4HF4vz5DewWmx5fY7W4vGsOm8Xn3iOMFjPO72Oy WHvkLrvF7cYVbBate4+wWxx+085qMWPySzYHQY9NqzrZPO5c28Pmcb/7OJPH5iX1Hn1bVjF6 fN4kF8AWpWdTlF9akqqQkV9cYqsUbWhhpGdoaaFnZGKpZ2hsHmtlZKqkb2eTkpqTWZZapG+X oJexekpdQS9HRff3yAbGR2xdjJwcEgImEstap7F0MXJxCAksZZT4+XgVkMMBlJCSmN+iBFEj LPHnWhcbRM0nRomrj1cwgiTYBAwleo/2gdkiAh4Sp1rXsoLYzAIzmCVOzzIFsYUFgiXmPeph BrFZBFQl/s7rBLN5BawkVlx9yw6xQF5i9YYDzCB7OQWsJQ5/5gUJCwGVHOtfwA5RLihxcuYT sNOYBdQl1s8TgtgkL9G8dTbzBEbBWUiqZiFUzUJStYCReRWjSGppcW56brGRXnFibnFpXrpe cn7uJkZglG479nPLDsaud8GHGAU4GJV4eCcc/xsnxJpYVlyZe4hRgoNZSYTX6ezpOCHelMTK qtSi/Pii0pzU4kOMpkCfTWSWEk3OByaQvJJ4Q1NDcwtLQ3Njc2MzCyVx3g6BgzFCAumJJanZ qakFqUUwfUwcnFINjJs/7t9Zse3uM//0g66qbnXulxn3ahTwzi922CV2hr/sTOmFJ2zv+bK1 vhko/0/my/nNMN/2YYWOj/iesHuPp1RPsI0POjg7me+RGssDd3n2ab52rx1mTOH+VnszeJVV nZr/V/4Au8izMZIzOPdZ1KZ1rj67S4rdXzNUkcsyur/hju1px3+FSizFGYmGWsxFxYkAe7DS GugCAAA= X-CMS-MailID: 20200702163758eucas1p1e18d95f3dce34df1f4334da5462a04a2 X-Msg-Generator: CA X-RootMTR: 20200702163758eucas1p1e18d95f3dce34df1f4334da5462a04a2 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200702163758eucas1p1e18d95f3dce34df1f4334da5462a04a2 References: <20200702163724.2218-1-s.nawrocki@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200702_123759_993307_7770EBE5 X-CRM114-Status: GOOD ( 13.70 ) X-Spam-Score: -5.2 (-----) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-5.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [210.118.77.12 listed in wl.mailspike.net] -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [210.118.77.12 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, b.zolnierkie@samsung.com, linux-pm@vger.kernel.org, sw0312.kim@samsung.com, a.swigon@samsung.com, robh+dt@kernel.org, linux-kernel@vger.kernel.org, inki.dae@samsung.com, myungjoo.ham@samsung.com, dri-devel@lists.freedesktop.org, s.nawrocki@samsung.com, linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Artur Świgoń This patch adds an 'interconnects' property to Exynos4412 DTS in order to declare the interconnect path used by the mixer. Please note that the 'interconnect-names' property is not needed when there is only one path in 'interconnects', in which case calling of_icc_get() with a NULL name simply returns the right path. Signed-off-by: Artur Świgoń Reviewed-by: Chanwoo Choi --- Changes for v5, v6: - none. --- arch/arm/boot/dts/exynos4412.dtsi | 1 + 1 file changed, 1 insertion(+) -- 2.7.4 diff --git a/arch/arm/boot/dts/exynos4412.dtsi b/arch/arm/boot/dts/exynos4412.dtsi index 24529d4..e0be193 100644 --- a/arch/arm/boot/dts/exynos4412.dtsi +++ b/arch/arm/boot/dts/exynos4412.dtsi @@ -777,6 +777,7 @@ clock-names = "mixer", "hdmi", "sclk_hdmi", "vp"; clocks = <&clock CLK_MIXER>, <&clock CLK_HDMI>, <&clock CLK_SCLK_HDMI>, <&clock CLK_VP>; + interconnects = <&bus_display &bus_dmc>; }; &pmu { From patchwork Thu Jul 2 16:37:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Sylwester Nawrocki/Kernel \\(PLT\\) /SRPOL/Staff Engineer/Samsung Electronics" X-Patchwork-Id: 11639685 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E010F14B7 for ; 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Thu, 2 Jul 2020 16:38:00 +0000 (GMT) From: Sylwester Nawrocki To: georgi.djakov@linaro.org, cw00.choi@samsung.com, krzk@kernel.org Subject: [PATCH RFC v6 6/6] drm: exynos: mixer: Add interconnect support Date: Thu, 2 Jul 2020 18:37:24 +0200 Message-Id: <20200702163724.2218-7-s.nawrocki@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200702163724.2218-1-s.nawrocki@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA02SazCUYRTH59n3sku9ei2TJxplp4tqcklTTy1dzdgvzZRPaaJW3kFYZte1 UoxsrMusNSIVkplYY7BpxyXK2mwyGMOIbGO0yijGFPuBsmW9Kt9+5zn/c/7nnHl4GH+IcOZF SuIZqUQcLSBtcW330sDBSMoS4mVcckUTZZkANZbUE+j94jSByvX9BBo2z5OouF1DItWEEkcD Aw1cpDGNEGio9RGJFvL0AJUMdHBQnf4jF42nV5Mos13PRV2z9whUUjhDnrIXadTZpMg48pIU TeQYOKLnVXdE+U1qIFrQuJ4nL9n6hjHRkYmM1PPEVdsI+aiajEsLSG7RqLA00HdMAWx4kD4M 89T9uJX5dDWAveZEBbBd5UUALcYSnA0WAFRXKjAF4K1VVFVcZN+fAfjOWEf+q+j7VMC1tiJp b5j3Jh9Y2ZH2h/LPZWudMDoLg9pmFWZNONAiaDLNcayM07thVW0jYWWKPg6nnjQAdr4dsLbh 9ZqzDS2EXQsUK7GHPQ+m1sbGViUZLx5i1v6QNnPhB1UPztb6Q5W+c50d4FdDE5fl7bC3MBdn CzIAzG0b57KBEsAJQ8W6sxAa+5dJqzNG74P1rZ7s82k49uMxyZ7CDo7O2bND2EGVtnj9QhTM kvNZ9S74U13MYdkZ5kz9xlmJCH6fFCqBW+mGbUo3bFP637YCYGrgxCTIYsIZ2SEJk+QhE8fI EiThHtdiYzRg9av1WgyLzaD1V6gO0Dwg2EwpDSshfEKcKEuJ0QHIwwSO1Jm+3hA+FSZOucFI Y69IE6IZmQ648HCBE+VTORPMp8PF8UwUw8Qx0r9ZDs/GOQ0cnf9WKvDKNqcPC5sKNmUuT98f s7hriWrFF2XQub17UvPanEZMSpeip4F3J30OhFkCfXvCsNTL7u6DJ7MkrXMd8u4VarZx66BH 0M7bRR1yc9OW6yl9ocIjDimhLbfUgUTwYJLRLcrLr+ZtS/KFbQHlIzU6Z5Pfzc6GhKCCs7mv ggW4LELsvR+TysR/ADJHsF5mAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrGIsWRmVeSWpSXmKPExsVy+t/xe7qZvP/iDD5MYbe4P6+V0WLjjPWs Fte/PGe1mH/kHKvFla/v2Sym793EZjHp/gQWi/PnN7BbbHp8jdXi8q45bBafe48wWsw4v4/J Yu2Ru+wWtxtXsFm07j3CbnH4TTurxYzJL9kcBD02repk87hzbQ+bx/3u40wem5fUe/RtWcXo 8XmTXABblJ5NUX5pSapCRn5xia1StKGFkZ6hpYWekYmlnqGxeayVkamSvp1NSmpOZllqkb5d gl5G241VbAUN7hU7N01ibmA8a9nFyMEhIWAisWRBRBcjF4eQwFJGie2357FCxKUk5rcodTFy ApnCEn+udbFB1HxilPh5bCM7SIJNwFCi92gfI4gtIuAhcap1LSuIzSwwg1ni9CxTEFsYKP74 8VsmEJtFQFViyeqNYDW8AlYSTxZuYIRYIC+xesMBZpC9nALWEoc/84KEhYBKjvUvYIcoF5Q4 OfMJC0gJs4C6xPp5QhCb5CWat85mnsAoOAtJ1SyEqllIqhYwMq9iFEktLc5Nzy020itOzC0u zUvXS87P3cQIjNNtx35u2cHY9S74EKMAB6MSD++E43/jhFgTy4orcw8xSnAwK4nwOp09HSfE m5JYWZValB9fVJqTWnyI0RTos4nMUqLJ+cAUklcSb2hqaG5haWhubG5sZqEkztshcDBGSCA9 sSQ1OzW1ILUIpo+Jg1OqgTFAW/TG8QulvWdjzR4Le3wOkfi3rPCV4OKrPzQW1HHcmBwz75La 4inFQhOrzsSweWcaf8q/cXPPxJm9z/8UsPWXT+Fbk9qT5DSbT4ZLcMJK9uWzjk2oFbF7u3Si 8aarDMZcq6Umqx4uzJ9lLH6E9cn37beUReecfe0mrXJRdScXR8iUg009Bf5KLMUZiYZazEXF iQCw9jSz6QIAAA== X-CMS-MailID: 20200702163801eucas1p12db276c7ac9e244e93e4b2f3d33ba729 X-Msg-Generator: CA X-RootMTR: 20200702163801eucas1p12db276c7ac9e244e93e4b2f3d33ba729 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200702163801eucas1p12db276c7ac9e244e93e4b2f3d33ba729 References: <20200702163724.2218-1-s.nawrocki@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200702_123803_160564_F40174AB X-CRM114-Status: GOOD ( 31.56 ) X-Spam-Score: -5.2 (-----) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-5.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [210.118.77.12 listed in wl.mailspike.net] -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [210.118.77.12 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, b.zolnierkie@samsung.com, linux-pm@vger.kernel.org, sw0312.kim@samsung.com, a.swigon@samsung.com, robh+dt@kernel.org, linux-kernel@vger.kernel.org, inki.dae@samsung.com, myungjoo.ham@samsung.com, dri-devel@lists.freedesktop.org, s.nawrocki@samsung.com, linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org This patch adds interconnect support to exynos-mixer. The mixer works the same as before when CONFIG_INTERCONNECT is 'n'. For proper operation of the video mixer block we need to ensure the interconnect busses like DMC or LEFTBUS provide enough bandwidth so as to avoid DMA buffer underruns in the mixer block. I.e we need to prevent those busses from operating in low perfomance OPPs when the mixer is running. In this patch the bus bandwidth request is done through the interconnect API, the bandwidth value is calculated from selected DRM mode, i.e. video plane width, height, refresh rate and pixel format. The bandwidth setting is synchronized with VSYNC when we are switching to lower bandwidth. This is required to ensure enough bandwidth for the device since new settings are normally being applied in the hardware synchronously with VSYNC. Co-developed-by: Artur Świgoń Signed-off-by: Marek Szyprowski Signed-off-by: Sylwester Nawrocki --- Changes for v6: - the icc_set_bw() call is now only done when calculated value for a crtc changes, this avoids unnecessary calls per each video frame - added synchronization of the interconnect bandwidth setting with the mixer VSYNC in order to avoid buffer underflow when we lower the interconnect bandwidth when the hardware still operates with previous mode settings that require higher bandwidth. This fixed IOMMU faults observed e.g. during switching from two planes to a single plane operation. Changes for v5: - renamed soc_path variable to icc_path --- drivers/gpu/drm/exynos/exynos_mixer.c | 150 ++++++++++++++++++++++++++++++++-- 1 file changed, 142 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c index c7e2e2e..f7babf8 100644 --- a/drivers/gpu/drm/exynos/exynos_mixer.c +++ b/drivers/gpu/drm/exynos/exynos_mixer.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -73,6 +74,7 @@ enum mixer_flag_bits { MXR_BIT_INTERLACE, MXR_BIT_VP_ENABLED, MXR_BIT_HAS_SCLK, + MXR_BIT_REQUEST_BW, }; static const uint32_t mixer_formats[] = { @@ -99,6 +101,13 @@ struct mixer_context { struct exynos_drm_plane planes[MIXER_WIN_NR]; unsigned long flags; + struct icc_path *icc_path; + /* memory bandwidth on the interconnect bus in B/s */ + unsigned long icc_bandwidth; + /* mutex protecting @icc_bandwidth and serializing access to @icc_path */ + struct mutex icc_lock; + struct work_struct work; + int irq; void __iomem *mixer_regs; void __iomem *vp_regs; @@ -754,6 +763,9 @@ static irqreturn_t mixer_irq_handler(int irq, void *arg) val |= MXR_INT_CLEAR_VSYNC; val &= ~MXR_INT_STATUS_VSYNC; + if (test_and_clear_bit(MXR_BIT_REQUEST_BW, &ctx->flags)) + schedule_work(&ctx->work); + /* interlace scan need to check shadow register */ if (test_bit(MXR_BIT_INTERLACE, &ctx->flags) && !mixer_is_synced(ctx)) @@ -934,6 +946,78 @@ static void mixer_disable_vblank(struct exynos_drm_crtc *crtc) mixer_reg_writemask(mixer_ctx, MXR_INT_EN, 0, MXR_INT_EN_VSYNC); } +/** + * mixer_get_memory_bandwidth - calculate memory bandwidth for current crtc mode + * @crtc: a crtc with DRM mode to calculate the bandwidth for + * + * Return: memory bandwidth in B/s + * + * This function returns memory bandwidth calculated as a sum of amount of data + * per second for each plane. The calculation is based on maximum possible pixel + * resolution for a plane so as to avoid different bandwidth request per each + * video frame. The formula used for calculation for each plane is: + * + * bw = width * height * frame_rate / interlace / (hor_subs * vert_subs) + * + * where: + * - width, height - (DRM mode) video frame width and height in pixels, + * - frame_rate - DRM mode frame refresh rate, + * - interlace: 1 - in case of progressive and 2 in case of interlaced video, + * - hor_subs, vert_subs - accordingly horizontal and vertical pixel + * subsampling for a plane. + */ +static unsigned int mixer_get_memory_bandwidth(struct exynos_drm_crtc *crtc) +{ + struct drm_display_mode *mode = &crtc->base.state->adjusted_mode; + struct mixer_context *ctx = crtc->ctx; + unsigned long bw, bandwidth = 0; + int i, j, sub; + + for (i = 0; i < MIXER_WIN_NR; i++) { + struct drm_plane *plane = &ctx->planes[i].base; + const struct drm_format_info *format; + + if (plane->state && plane->state->crtc && plane->state->fb) { + format = plane->state->fb->format; + bw = mode->hdisplay * mode->vdisplay * + drm_mode_vrefresh(mode); + if (mode->flags & DRM_MODE_FLAG_INTERLACE) + bw /= 2; + for (j = 0; j < format->num_planes; j++) { + sub = j ? (format->vsub * format->hsub) : 1; + bandwidth += format->cpp[j] * bw / sub; + } + } + } + + return bandwidth; +} + +static void mixer_set_icc_bandwidth(struct mixer_context *ctx) +{ + unsigned long bandwidth; + u32 avg_bw, peak_bw; + + mutex_lock(&ctx->icc_lock); + + /* add 20% safety margin */ + bandwidth = ctx->icc_bandwidth / 4 * 5; + + avg_bw = peak_bw = Bps_to_icc(bandwidth); + icc_set_bw(ctx->icc_path, avg_bw, peak_bw); + + mutex_unlock(&ctx->icc_lock); + + dev_dbg(ctx->dev, "safe bandwidth %lu Bps\n", bandwidth); +} + +static void mixer_icc_request_fn(struct work_struct *work) +{ + struct mixer_context *ctx = container_of(work, struct mixer_context, + work); + mixer_set_icc_bandwidth(ctx); +} + static void mixer_atomic_begin(struct exynos_drm_crtc *crtc) { struct mixer_context *ctx = crtc->ctx; @@ -980,12 +1064,34 @@ static void mixer_disable_plane(struct exynos_drm_crtc *crtc, static void mixer_atomic_flush(struct exynos_drm_crtc *crtc) { - struct mixer_context *mixer_ctx = crtc->ctx; + struct mixer_context *ctx = crtc->ctx; + int bw, prev_bw; - if (!test_bit(MXR_BIT_POWERED, &mixer_ctx->flags)) + if (!test_bit(MXR_BIT_POWERED, &ctx->flags)) return; - mixer_enable_sync(mixer_ctx); + /* + * Request necessary bandwidth on the interconnects. If new + * bandwidth is greater than current value set the new value + * immediately. Otherwise request lower bandwidth only after + * VSYNC, after the HW has actually switched to new video + * frame settings. + */ + if (ctx->icc_path) { + bw = mixer_get_memory_bandwidth(crtc); + + mutex_lock(&ctx->icc_lock); + prev_bw = ctx->icc_bandwidth; + ctx->icc_bandwidth = bw; + mutex_unlock(&ctx->icc_lock); + + if (bw > prev_bw) + mixer_set_icc_bandwidth(ctx); + else if (bw < prev_bw) + set_bit(MXR_BIT_REQUEST_BW, &ctx->flags); + } + + mixer_enable_sync(ctx); exynos_crtc_handle_event(crtc); } @@ -1036,6 +1142,10 @@ static void mixer_atomic_disable(struct exynos_drm_crtc *crtc) pm_runtime_put(ctx->dev); + cancel_work_sync(&ctx->work); + ctx->icc_bandwidth = 0; + mixer_set_icc_bandwidth(ctx); + clear_bit(MXR_BIT_POWERED, &ctx->flags); } @@ -1210,6 +1320,7 @@ static void mixer_unbind(struct device *dev, struct device *master, void *data) { struct mixer_context *ctx = dev_get_drvdata(dev); + cancel_work_sync(&ctx->work); mixer_ctx_remove(ctx); } @@ -1223,19 +1334,33 @@ static int mixer_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; const struct mixer_drv_data *drv; struct mixer_context *ctx; + struct icc_path *path; int ret; + /* + * Returns NULL if CONFIG_INTERCONNECT is disabled. + * May return ERR_PTR(-EPROBE_DEFER). + */ + path = of_icc_get(dev, NULL); + if (IS_ERR(path)) + return PTR_ERR(path); + ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL); if (!ctx) { DRM_DEV_ERROR(dev, "failed to alloc mixer context.\n"); - return -ENOMEM; + ret = -ENOMEM; + goto err; } drv = of_device_get_match_data(dev); + INIT_WORK(&ctx->work, mixer_icc_request_fn); + mutex_init(&ctx->icc_lock); + ctx->pdev = pdev; ctx->dev = dev; ctx->mxr_ver = drv->version; + ctx->icc_path = path; if (drv->is_vp_enabled) __set_bit(MXR_BIT_VP_ENABLED, &ctx->flags); @@ -1247,17 +1372,26 @@ static int mixer_probe(struct platform_device *pdev) pm_runtime_enable(dev); ret = component_add(&pdev->dev, &mixer_component_ops); - if (ret) + if (ret) { pm_runtime_disable(dev); - + goto err; + } + return 0; +err: + icc_put(path); return ret; } static int mixer_remove(struct platform_device *pdev) { - pm_runtime_disable(&pdev->dev); + struct device *dev = &pdev->dev; + struct mixer_context *ctx = dev_get_drvdata(dev); + + pm_runtime_disable(dev); + + component_del(dev, &mixer_component_ops); - component_del(&pdev->dev, &mixer_component_ops); + icc_put(ctx->icc_path); return 0; }