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Mon, 18 May 2020 14:06:40 +0900 (KST) Received: from [10.113.221.211] (unknown [10.113.221.211]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200518050639epsmtip2c1f13627263c081c8c4347b6fc012ea1~QBwghwXnE1300013000epsmtip2X; Mon, 18 May 2020 05:06:39 +0000 (GMT) Subject: Re: [PATCH] drm/exynos: mixer: Fix enabling of the runtime power management To: Marek Szyprowski , dri-devel@lists.freedesktop.org, linux-samsung-soc@vger.kernel.org Cc: Bartlomiej Zolnierkiewicz , Seung-Woo Kim , Andrzej Hajda From: Inki Dae Message-ID: <0d14cec1-9c24-4e31-ca86-9f90bc1efde0@samsung.com> Date: Mon, 18 May 2020 14:12:00 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <20200514100812.17043-1-m.szyprowski@samsung.com> Content-Language: en-US Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprKJsWRmVeSWpSXmKPExsWy7bCmge4D8UNxBjtfKVvcWneO1WLjjPWs Fle+vmezmHF+H5PF2iN32S1mTH7J5sDmcb/7OJNH35ZVjB6fN8kFMEdl22SkJqakFimk5iXn p2TmpdsqeQfHO8ebmhkY6hpaWpgrKeQl5qbaKrn4BOi6ZeYA7VVSKEvMKQUKBSQWFyvp29kU 5ZeWpCpk5BeX2CqlFqTkFFgW6BUn5haX5qXrJefnWhkaGBiZAhUmZGfcmvqPveAFT8WDHYeY GxiPcnUxcnJICJhIHJ17lbmLkYtDSGAHo8SB3zehnE+MEkv77rJAOJ8ZJdau/cQC09IxdwUb iC0ksItR4vWVAIii94wSZ+dfZwVJCAuESZw8/RfMFhEolZj7/xg7iM0s0A406Xg8iM0moCox ccV9sEG8AnYSqyatAqtnAYq/etwBFOfgEBWIkDj9NRGiRFDi5MwnYDdwApV/6L7NCDFSXOLW k/lMELa8RPPW2cwQd35ll5hz3g/CdpG4daiPDcIWlnh1fAs7hC0l8bK/jR3kfgmBZkaJiTNO M0E4HYwSdx9fh/rYWGL/0slMIAcxC2hKrN+lDxFWlNj5ey7UEXwS7772sIKUSAjwSnS0CUGU KEkcu3iDEcKWkLiwZCLUDR4S11tus05gVJyF5LVZSN6ZheSdWQiLFzCyrGIUSy0ozk1PLTYs MEaO7E2M4CSpZb6DccM5n0OMAhyMSjy8F6IOxgmxJpYVV+YeYpTgYFYS4Y38vC9OiDclsbIq tSg/vqg0J7X4EKMpMOAnMkuJJucDE3heSbyhqZGxsbGFiaGZqaGhkjjv1Os5cUIC6Yklqdmp qQWpRTB9TBycUg2MJbyujOx/ppwszT3jcvyX66QfLZFvrxR8EVPZudSvZdmlps8qjTZz7mxI O3KqrSBCaN9jf2UDJ5PdOd7Tzk1MvMy6vuj5trtucvKWK1Jq6i9Ey99v83qmlftd6mZDrXaZ 4ry6S881rYMnb3IoSTYUP7V7tUKs69P/qrUVBe57pUTTzax/i61WYinOSDTUYi4qTgQANJ/x cqgDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrBLMWRmVeSWpSXmKPExsWy7bCSvO4D8UNxBj0dbBa31p1jtdg4Yz2r xZWv79ksZpzfx2Sx9shddosZk1+yObB53O8+zuTRt2UVo8fnTXIBzFFcNimpOZllqUX6dglc Gbem/mMveMFT8WDHIeYGxqNcXYycHBICJhIdc1ewdTFycQgJ7GCU+Pz9B1MXIwdQQkJiy1YO CFNY4vDhYoiSt4wS0zZ9YgfpFRYIkzh5+i8riC0iUCrxqv8+I0gRs0A7o8SRfR3sEB0TGSVm ntnIBFLFJqAqMXHFfTYQm1fATmLVpFVg3SxA8VePO8DiogIREs+332CEqBGUODnzCQuIzQlU /6H7NlicWUBd4s+8S8wQtrjErSfzmSBseYnmrbOZJzAKzULSPgtJyywkLbOQtCxgZFnFKJla UJybnltsWGCUl1quV5yYW1yal66XnJ+7iREcGVpaOxj3rPqgd4iRiYPxEKMEB7OSCG/k531x QrwpiZVVqUX58UWlOanFhxilOViUxHm/zloYJySQnliSmp2aWpBaBJNl4uCUamBiPrhl+Zd7 Cm/WK8zZ4N1tcjrsgcuxOdP3BTQ/V7+ybZ+Dg+5JlbX3NN56zJ6tqsbdy7TyY/gFq+RFUteq 64KSD0gHJiTEMJ9m2FW3XM5efa3C+ePLVao9SsT35ke2T+yy1PkRFsB9umZnYkSokFt56aVu qeD7kxgT/i1V4NSqy+Sp6Ltj97rM2s4yKDc3VlLgSNu3Yq8ts+56XV7RPN+01/Zu3tX9rmvq vujqH9DJTDG3C13MuSA1WEu9mLvtcNHGRQdLFbOZKsUyPTsVRVa+52aX/S7MlB7y5k9O13PZ CYbR7JpTf5/9EnTigAzb3iKbiJUrFlTGMjiGdn2Vv6T8+Mwvr/kxKXcYpUt/KbEUZyQaajEX FScCAJqDwC77AgAA X-CMS-MailID: 20200518050640epcas1p325ad883956af656e26788e218539fb10 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20200514100812eucas1p1d42ad25e93858a4bc801049f93f58250 References: <20200514100812.17043-1-m.szyprowski@samsung.com> Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Hi Marek, 20. 5. 14. 오후 7:08에 Marek Szyprowski 이(가) 쓴 글: > Runtime power management is essential for the Exynos Mixer driver > operation. It should be enabled before adding its DRM component, because > in some cases (when deferred probe takes place due to the IOMMU > availability) the DRM driver might be initialized directly from the > Mixer's component_add() call, what results in starting the driver > operation without enabling the runtime power management. Seems better to change call order of mixer_remove function like below because you changed the one of probe function. static int mixer_remove(struct platform_device *pdev) { component_del(&pdev->dev, &mixer_component_ops); pm_runtime_disable(&pdev->dev); } It's a trivial thing and it would be no problem as-is - we don't touch HW in unbind - so picked it up. Thanks, Inki Dae > > Signed-off-by: Marek Szyprowski > --- > drivers/gpu/drm/exynos/exynos_mixer.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c > index ffbf4a950f69..829d2ce7560d 100644 > --- a/drivers/gpu/drm/exynos/exynos_mixer.c > +++ b/drivers/gpu/drm/exynos/exynos_mixer.c > @@ -1200,9 +1200,11 @@ static int mixer_probe(struct platform_device *pdev) > > platform_set_drvdata(pdev, ctx); > > + pm_runtime_enable(dev); > + > ret = component_add(&pdev->dev, &mixer_component_ops); > - if (!ret) > - pm_runtime_enable(dev); > + if (ret) > + pm_runtime_disable(dev); > > return ret; > } > From mboxrd@z Thu Jan 1 00:00:00 1970 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=-8.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 44198C433E0 for ; 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