From patchwork Wed Apr 28 14:51:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 12229191 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D6621C05054 for ; Wed, 28 Apr 2021 14:54:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BA40D61441 for ; Wed, 28 Apr 2021 14:54:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240357AbhD1OzL (ORCPT ); Wed, 28 Apr 2021 10:55:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:36314 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240338AbhD1Oxl (ORCPT ); Wed, 28 Apr 2021 10:53:41 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C229161448; Wed, 28 Apr 2021 14:52:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1619621564; bh=ng2dKUVAN//CcGRaqNlPwb37YT/BiEuzdFhAtVtHvMM=; h=From:To:Cc:Subject:Date:From; b=HVhVnMzHNp3W/c5vm1TcCHFIgz42JpWpbR5vgFVKyh++Cc0eWHDQpWqqZukgv5Ax2 4kF3t5ZKPuW4pT9MkS4w0RMjdrWx5jBbm3yBxniXC4JNMggczAbBte7+hwc2MM0C9t mL2S7hpRg0h89iVjSzWMCQNyT67F08KkbrhPzx/9DTeaeLs2x/p6oiEnIFdf0uepKw ac9OSz3Z6Glhuk3HM2j49yKRrq5tdnyCRULN0cjbnQhoCUnVAZM8QC5rIRUOUqInV4 L/eDgALs+49L2PQL/XCqcFlJuk0OEal01HLkN5ItwWFwVHpjsgvQtax+EupZhP4zsA uCQEMDituhZ2Q== Received: by mail.kernel.org with local (Exim 4.94) (envelope-from ) id 1lblYP-001Dpb-HN; Wed, 28 Apr 2021 16:52:41 +0200 From: Mauro Carvalho Chehab Cc: linuxarm@huawei.com, mauro.chehab@huawei.com, Mauro Carvalho Chehab , "Lad, Prabhakar" , "Paul J. Murphy" , Alexandre Torgue , Andrzej Hajda , Andrzej Pietrasiewicz , Andy Gross , Benoit Parrot , Bingbu Cao , Bjorn Andersson , Chen-Yu Tsai , Chiranjeevi Rapolu , Dafna Hirschfeld , Dan Scally , Daniele Alessandrelli , Dave Stevenson , Dmitry Osipenko , Dongchun Zhu , Ezequiel Garcia , Fabio Estevam , Heiko Stuebner , Helen Koike , Hyungwoo Yang , Jacek Anaszewski , Jacob Chen , Jacopo Mondi , Jernej Skrabec , Jonathan Hunter , Krzysztof Kozlowski , Leon Luo , Manivannan Sadhasivam , Marek Szyprowski , Matt Ranostay , Matthias Brugger , Mauro Carvalho Chehab , Maxime Coquelin , Maxime Ripard , NXP Linux Team , Paul Kocialkowski , Pengutronix Kernel Team , Philipp Zabel , Ricardo Ribalda , Robert Foss , Rui Miguel Silva , Sakari Ailus , Sascha Hauer , Shawn Guo , Shawn Tu , Shunqian Zheng , Sowjanya Komatineni , Stanimir Varbanov , Steve Longerbeam , Sylwester Nawrocki , Sylwester Nawrocki , Thierry Reding , Tianshu Qiu , Todor Tomov , Wenyou Yang , Yong Zhi , devel@driverdev.osuosl.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-renesas-soc@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-tegra@vger.kernel.org Subject: [PATCH v4 00/79] Address some issues with PM runtime at media subsystem Date: Wed, 28 Apr 2021 16:51:21 +0200 Message-Id: X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Sender: Mauro Carvalho Chehab To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org During the review of the patches from unm.edu, one of the patterns I noticed is the amount of patches trying to fix pm_runtime_get_sync() calls. After analyzing the feedback from version 1 of this series, I noticed a few other weird behaviors at the PM runtime resume code. So, this series start addressing some bugs and issues at the current code. Then, it gets rid of pm_runtime_get_sync() at the media subsystem (with 2 exceptions). It should be noticed that Commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter") added a new method to does a pm_runtime get, which increments the usage count only on success. The rationale of getting rid of pm_runtime_get_sync() is: 1. despite its name, this is actually a PM runtime resume call, but some developers didn't seem to realize that, as I got this pattern on some drivers: pm_runtime_get_sync(&client->dev); pm_runtime_disable(&client->dev); pm_runtime_set_suspended(&client->dev); pm_runtime_put_noidle(&client->dev); It makes no sense to resume PM just to suspend it again ;-) 2. Usual *_get() methods only increment their use count on success, but pm_runtime_get_sync() increments it unconditionally. Due to that, several drivers were mistakenly not calling pm_runtime_put_noidle() when it fails; 3. The name of the new variant is a lot clearer: pm_runtime_resume_and_get() As its same clearly says that this is a PM runtime resume function, that also increments the usage counter on success; 4. Consistency: we did similar changes subsystem wide with for instance strlcpy() and strcpy() that got replaced by strscpy(). Having all drivers using the same known-to-be-safe methods is a good thing; 5. Prevent newer drivers to copy-and-paste a code that it would be easier to break if they don't truly understand what's behind the scenes. This series replace places pm_runtime_get_sync(), by calling pm_runtime_resume_and_get() instead. This should help to avoid future mistakes like that, as people tend to use the existing drivers as examples for newer ones. compile-tested only. Patches 1 to 7 fix some issues that already exists at the current PM runtime code; patches 8 to 20 fix some usage_count problems that still exists at the media subsystem; patches 21 to 78 repaces pm_runtime_get_sync() by pm_runtime_resume_and_get(); Patch 79 (and a hunk on patch 78) documents the two exceptions where pm_runtime_get_sync() will still be used for now. --- v4: - Added a couple of additional fixes at existing PM runtime code; - Some patches are now more conservative in order to avoid causing regressions. v3: - fix a compilation error; v2: - addressed pointed issues and fixed a few other PM issues. Mauro Carvalho Chehab (79): media: venus: fix PM runtime logic at venus_sys_error_handler() media: s6p_cec: decrement usage count if disabled media: i2c: ccs-core: return the right error code at suspend media: i2c: ov7740: don't resume at remove time media: i2c: video-i2c: don't resume at remove time media: i2c: imx334: fix the pm runtime get logic media: exynos-gsc: don't resume at remove time media: atmel: properly get pm_runtime media: marvel-ccic: fix some issues when getting pm_runtime media: mdk-mdp: fix pm_runtime_get_sync() usage count media: rcar_fdp1: fix pm_runtime_get_sync() usage count media: renesas-ceu: Properly check for PM errors media: s5p: fix pm_runtime_get_sync() usage count media: am437x: fix pm_runtime_get_sync() usage count media: sh_vou: fix pm_runtime_get_sync() usage count media: mtk-vcodec: fix pm_runtime_get_sync() usage count media: s5p-jpeg: fix pm_runtime_get_sync() usage count media: sti/delta: fix pm_runtime_get_sync() usage count media: sunxi: fix pm_runtime_get_sync() usage count staging: media: rkvdec: fix pm_runtime_get_sync() usage count staging: media: atomisp: use pm_runtime_resume_and_get() staging: media: imx7-mipi-csis: use pm_runtime_resume_and_get() staging: media: ipu3: use pm_runtime_resume_and_get() staging: media: cedrus_video: use pm_runtime_resume_and_get() staging: media: tegra-vde: use pm_runtime_resume_and_get() staging: media: tegra-video: use pm_runtime_resume_and_get() media: i2c: ak7375: use pm_runtime_resume_and_get() media: i2c: ccs-core: use pm_runtime_resume_and_get() media: i2c: dw9714: use pm_runtime_resume_and_get() media: i2c: dw9768: use pm_runtime_resume_and_get() media: i2c: dw9807-vcm: use pm_runtime_resume_and_get() media: i2c: hi556: use pm_runtime_resume_and_get() media: i2c: imx214: use pm_runtime_resume_and_get() media: i2c: imx219: use pm_runtime_resume_and_get() media: i2c: imx258: use pm_runtime_resume_and_get() media: i2c: imx274: use pm_runtime_resume_and_get() media: i2c: imx290: use pm_runtime_resume_and_get() media: i2c: imx319: use pm_runtime_resume_and_get() media: i2c: imx355: use pm_runtime_resume_and_get() media: i2c: mt9m001: use pm_runtime_resume_and_get() media: i2c: ov02a10: use pm_runtime_resume_and_get() media: i2c: ov13858: use pm_runtime_resume_and_get() media: i2c: ov2659: use pm_runtime_resume_and_get() media: i2c: ov2685: use pm_runtime_resume_and_get() media: i2c: ov2740: use pm_runtime_resume_and_get() media: i2c: ov5647: use pm_runtime_resume_and_get() media: i2c: ov5648: use pm_runtime_resume_and_get() media: i2c: ov5670: use pm_runtime_resume_and_get() media: i2c: ov5675: use pm_runtime_resume_and_get() media: i2c: ov5695: use pm_runtime_resume_and_get() media: i2c: ov7740: use pm_runtime_resume_and_get() media: i2c: ov8856: use pm_runtime_resume_and_get() media: i2c: ov8865: use pm_runtime_resume_and_get() media: i2c: ov9734: use pm_runtime_resume_and_get() media: i2c: tvp5150: use pm_runtime_resume_and_get() media: i2c: video-i2c: use pm_runtime_resume_and_get() media: rockchip/rga: use pm_runtime_resume_and_get() media: sti/hva: use pm_runtime_resume_and_get() media: sti/bdisp: use pm_runtime_resume_and_get() media: ipu3: use pm_runtime_resume_and_get() media: coda: use pm_runtime_resume_and_get() media: exynos4-is: use pm_runtime_resume_and_get() media: exynos-gsc: use pm_runtime_resume_and_get() media: mtk-jpeg: use pm_runtime_resume_and_get() media: camss: use pm_runtime_resume_and_get() media: venus: use pm_runtime_resume_and_get() media: venus: vdec: use pm_runtime_resume_and_get() media: venus: venc: use pm_runtime_resume_and_get() media: rcar-fcp: use pm_runtime_resume_and_get() media: rkisp1: use pm_runtime_resume_and_get() media: s3c-camif: use pm_runtime_resume_and_get() media: s5p-mfc: use pm_runtime_resume_and_get() media: stm32: use pm_runtime_resume_and_get() media: sunxi: use pm_runtime_resume_and_get() media: ti-vpe: use pm_runtime_resume_and_get() media: vsp1: use pm_runtime_resume_and_get() media: rcar-vin: use pm_runtime_resume_and_get() media: hantro: use pm_runtime_resume_and_get() media: hantro: do a PM resume earlier drivers/media/cec/platform/s5p/s5p_cec.c | 7 +++-- drivers/media/i2c/ak7375.c | 10 +------ drivers/media/i2c/ccs/ccs-core.c | 18 +++++------- drivers/media/i2c/dw9714.c | 10 +------ drivers/media/i2c/dw9768.c | 10 +------ drivers/media/i2c/dw9807-vcm.c | 10 +------ drivers/media/i2c/hi556.c | 3 +- drivers/media/i2c/imx214.c | 6 ++-- drivers/media/i2c/imx219.c | 6 ++-- drivers/media/i2c/imx258.c | 6 ++-- drivers/media/i2c/imx274.c | 3 +- drivers/media/i2c/imx290.c | 6 ++-- drivers/media/i2c/imx319.c | 6 ++-- drivers/media/i2c/imx334.c | 7 +++-- drivers/media/i2c/imx355.c | 6 ++-- drivers/media/i2c/mt9m001.c | 9 ++++-- drivers/media/i2c/ov02a10.c | 6 ++-- drivers/media/i2c/ov13858.c | 6 ++-- drivers/media/i2c/ov2659.c | 6 ++-- drivers/media/i2c/ov2685.c | 7 ++--- drivers/media/i2c/ov2740.c | 6 ++-- drivers/media/i2c/ov5647.c | 9 +++--- drivers/media/i2c/ov5648.c | 6 ++-- drivers/media/i2c/ov5670.c | 6 ++-- drivers/media/i2c/ov5675.c | 3 +- drivers/media/i2c/ov5695.c | 6 ++-- drivers/media/i2c/ov7740.c | 8 ++--- drivers/media/i2c/ov8856.c | 3 +- drivers/media/i2c/ov8865.c | 6 ++-- drivers/media/i2c/ov9734.c | 3 +- drivers/media/i2c/tvp5150.c | 16 ++-------- drivers/media/i2c/video-i2c.c | 14 +++------ drivers/media/pci/intel/ipu3/ipu3-cio2-main.c | 3 +- drivers/media/platform/am437x/am437x-vpfe.c | 22 ++++++++++---- drivers/media/platform/atmel/atmel-isc-base.c | 27 ++++++++++++----- drivers/media/platform/atmel/atmel-isi.c | 19 +++++++++--- drivers/media/platform/coda/coda-common.c | 7 +++-- drivers/media/platform/exynos-gsc/gsc-core.c | 11 +++---- drivers/media/platform/exynos-gsc/gsc-m2m.c | 2 +- .../media/platform/exynos4-is/fimc-capture.c | 6 ++-- drivers/media/platform/exynos4-is/fimc-is.c | 4 +-- .../platform/exynos4-is/fimc-isp-video.c | 3 +- drivers/media/platform/exynos4-is/fimc-isp.c | 7 ++--- drivers/media/platform/exynos4-is/fimc-lite.c | 5 ++-- drivers/media/platform/exynos4-is/fimc-m2m.c | 2 +- drivers/media/platform/exynos4-is/media-dev.c | 8 ++--- drivers/media/platform/exynos4-is/mipi-csis.c | 8 ++--- .../media/platform/marvell-ccic/mcam-core.c | 9 ++++-- .../media/platform/mtk-jpeg/mtk_jpeg_core.c | 4 +-- drivers/media/platform/mtk-mdp/mtk_mdp_m2m.c | 6 ++-- .../platform/mtk-vcodec/mtk_vcodec_dec_pm.c | 4 +-- .../media/platform/qcom/camss/camss-csid.c | 6 ++-- .../media/platform/qcom/camss/camss-csiphy.c | 6 ++-- .../media/platform/qcom/camss/camss-ispif.c | 6 ++-- drivers/media/platform/qcom/camss/camss-vfe.c | 5 ++-- drivers/media/platform/qcom/venus/core.c | 28 +++++++++++------- .../media/platform/qcom/venus/pm_helpers.c | 10 +++---- drivers/media/platform/qcom/venus/vdec.c | 4 +-- drivers/media/platform/qcom/venus/venc.c | 5 ++-- drivers/media/platform/rcar-fcp.c | 6 ++-- drivers/media/platform/rcar-vin/rcar-csi2.c | 15 ++++++++-- drivers/media/platform/rcar-vin/rcar-dma.c | 6 ++-- drivers/media/platform/rcar-vin/rcar-v4l2.c | 6 ++-- drivers/media/platform/rcar_fdp1.c | 12 ++++++-- drivers/media/platform/renesas-ceu.c | 4 +-- drivers/media/platform/rockchip/rga/rga-buf.c | 3 +- drivers/media/platform/rockchip/rga/rga.c | 4 ++- .../platform/rockchip/rkisp1/rkisp1-capture.c | 3 +- .../media/platform/s3c-camif/camif-capture.c | 2 +- drivers/media/platform/s3c-camif/camif-core.c | 5 ++-- drivers/media/platform/s5p-jpeg/jpeg-core.c | 2 +- drivers/media/platform/s5p-mfc/s5p_mfc_pm.c | 6 ++-- drivers/media/platform/sh_vou.c | 6 +++- drivers/media/platform/sti/bdisp/bdisp-v4l2.c | 7 +++-- drivers/media/platform/sti/delta/delta-v4l2.c | 4 +-- drivers/media/platform/sti/hva/hva-hw.c | 17 ++++++----- drivers/media/platform/stm32/stm32-dcmi.c | 5 ++-- .../platform/sunxi/sun4i-csi/sun4i_v4l2.c | 6 ++-- .../sunxi/sun8i-rotate/sun8i_rotate.c | 2 +- drivers/media/platform/ti-vpe/cal-video.c | 4 ++- drivers/media/platform/ti-vpe/cal.c | 8 +++-- drivers/media/platform/ti-vpe/vpe.c | 4 +-- drivers/media/platform/vsp1/vsp1_drv.c | 6 ++-- .../staging/media/atomisp/pci/atomisp_fops.c | 6 ++-- drivers/staging/media/hantro/hantro_drv.c | 29 ++++++++++++------- drivers/staging/media/imx/imx7-mipi-csis.c | 7 ++--- drivers/staging/media/ipu3/ipu3.c | 3 +- drivers/staging/media/rkvdec/rkvdec.c | 2 +- .../staging/media/sunxi/cedrus/cedrus_video.c | 6 ++-- drivers/staging/media/tegra-vde/vde.c | 19 ++++++++++-- drivers/staging/media/tegra-video/csi.c | 3 +- drivers/staging/media/tegra-video/vi.c | 3 +- 92 files changed, 335 insertions(+), 347 deletions(-)