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Sat, 27 Jul 2019 15:51:28 +0800 Message-ID: <1564213888.22908.4.camel@mhfsdcap03> Subject: Re: [PATCH v2 00/12] Clean up "mediatek,larb" after adding device_link From: Yong Wu To: CK Hu Date: Sat, 27 Jul 2019 15:51:28 +0800 In-Reply-To: <1563849109.27558.14.camel@mtksdaap41> References: <1560171313-28299-1-git-send-email-yong.wu@mediatek.com> <1563849109.27558.14.camel@mtksdaap41> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: B3B5B4BEFFF99C65728AE2E1DD572EDEE773F4B9A5223F313A27C88854DAF4DC2000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190727_005147_788180_24338952 X-CRM114-Status: GOOD ( 24.87 ) 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: youlin.pei@mediatek.com, devicetree@vger.kernel.org, Nicolas Boichat , srv_heupstream@mediatek.com, Joerg Roedel , Will Deacon , linux-kernel@vger.kernel.org, Evan Green , Tomasz Figa , iommu@lists.linux-foundation.org, Rob Herring , linux-mediatek@lists.infradead.org, joey.pan@mediatek.com, Matthias Brugger , yingjoe.chen@mediatek.com, anan.sun@mediatek.com, Robin Murphy , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, 2019-07-23 at 10:31 +0800, CK Hu wrote: > Hi, Yong: > > I've added log in mtk_smi_clk_enable() and mtk_smi_clk_disable(), and I > boot MT8183 with display, the log is > > [ 4.020340] mtk-smi-common 14019000.smi: mtk_smi_clk_enable() > [ 4.331371] mtk-smi-common 14019000.smi: mtk_smi_clk_disable() > [ 4.429578] mtk-smi-common 14019000.smi: mtk_smi_clk_enable() > [ 4.719743] mtk-smi-common 14019000.smi: mtk_smi_clk_disable() > [ 5.084770] mtk-smi-common 14019000.smi: mtk_smi_clk_enable() > [ 5.904310] mtk-smi-common 14019000.smi: mtk_smi_clk_disable() > > From the log, the clock is finally turned off, but the display works > normally. This is because scpsys has turn the clock on, > > scpsys: syscon@10006000 { > compatible = "mediatek,mt8183-scpsys", "syscon"; > #power-domain-cells = <1>; > reg = <0 0x10006000 0 0x1000>; > clocks = <&topckgen CLK_TOP_MUX_AUD_INTBUS>, > <&mmsys CLK_MM_SMI_COMMON>, > <&mmsys CLK_MM_GALS_COMM0>, > <&mmsys CLK_MM_GALS_COMM1>, > clock-names = "audio","mm-0", > "mm-1", "mm-2"; > } > > I'm worried that for MT8173, scpsys would not turn on subsys clock, this > series would let display work abnormally, so I think smi common should > not depend on scpsys to turn on the clock. > > You could simply remove the clock parameter in scpsys device node, and > you would see the display works abnormally. Thanks for the report. I have reproduced this issue by removing the smi clock in scpsys node. Now the probe sequence is like this: a) mtk scpsys (genpd) probe b) smi probe c) iommu probe d) display and the other MM probe. The log above are called from device_link_add and rpm_idle which is called between iommu-probe and display-probe. At the beginning, all the clocks are enabled. But after this mtk_smi_clk_enable and mtk_smi_clk_disable, the display clock will be turned off. If the fastlogo is displayed before kernel, then the display HW will work abnormally. I have no mt8173 evb board now, I remembered that the screen only is showed in display driver of kernel in mt8173, It may be ok in that case. But It really is a problem when the fastlogo is showed before kernel. This clock issue happened before display driver, It looks display driver can not help this. I will try to fix it in SMI(smi try to help display(larb0) to pm_runtime_get_sync one time and put later). > > Regards, > CK > > > On Mon, 2019-06-10 at 20:55 +0800, Yong Wu wrote: > > MediaTek IOMMU block diagram always like below: > > > > M4U > > | > > smi-common > > | > > ------------- > > | | ... > > | | > > larb1 larb2 > > | | > > vdec venc > > > > All the consumer connect with smi-larb, then connect with smi-common. > > > > MediaTek IOMMU don't have its power-domain. When the consumer works, > > it should enable the smi-larb's power which also need enable the smi-common's > > power firstly. > > > > Thus, Firstly, use the device link connect the consumer and the > > smi-larbs. then add device link between the smi-larb and smi-common. > > > > After adding the device_link, then "mediatek,larb" property can be removed. > > the iommu consumer don't need call the mtk_smi_larb_get/put to enable > > the power and clock of smi-larb and smi-common. > > > > This patchset depends on "MT8183 IOMMU SUPPORT"[1]. > > > > [1] https://lists.linuxfoundation.org/pipermail/iommu/2019-June/036552.html > > > > Change notes: > > v2: > > 1) rebase on v5.2-rc1. > > 2) Move adding device_link between the consumer and smi-larb into > > iommu_add_device from Robin. > > 3) add DL_FLAG_AUTOREMOVE_CONSUMER even though the smi is built-in from Evan. > > 4) Remove the shutdown callback in iommu. > > > > v1: https://lists.linuxfoundation.org/pipermail/iommu/2019-January/032387.html > > > > Yong Wu (12): > > dt-binding: mediatek: Get rid of mediatek,larb for multimedia HW > > iommu/mediatek: Add probe_defer for smi-larb > > iommu/mediatek: Add device_link between the consumer and the larb > > devices > > memory: mtk-smi: Add device-link between smi-larb and smi-common > > media: mtk-jpeg: Get rid of mtk_smi_larb_get/put > > media: mtk-mdp: Get rid of mtk_smi_larb_get/put > > media: mtk-vcodec: Get rid of mtk_smi_larb_get/put > > drm/mediatek: Get rid of mtk_smi_larb_get/put > > memory: mtk-smi: Get rid of mtk_smi_larb_get/put > > iommu/mediatek: Use builtin_platform_driver > > arm: dts: mediatek: Get rid of mediatek,larb for MM nodes > > arm64: dts: mediatek: Get rid of mediatek,larb for MM nodes > > > > .../bindings/display/mediatek/mediatek,disp.txt | 9 ----- > > .../bindings/media/mediatek-jpeg-decoder.txt | 4 -- > > .../devicetree/bindings/media/mediatek-mdp.txt | 8 ---- > > .../devicetree/bindings/media/mediatek-vcodec.txt | 4 -- > > arch/arm/boot/dts/mt2701.dtsi | 1 - > > arch/arm/boot/dts/mt7623.dtsi | 1 - > > arch/arm64/boot/dts/mediatek/mt8173.dtsi | 15 ------- > > drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 11 ----- > > drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 26 ------------ > > drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 1 - > > drivers/iommu/mtk_iommu.c | 45 +++++++-------------- > > drivers/iommu/mtk_iommu_v1.c | 39 +++++++----------- > > drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c | 22 ---------- > > drivers/media/platform/mtk-jpeg/mtk_jpeg_core.h | 2 - > > drivers/media/platform/mtk-mdp/mtk_mdp_comp.c | 38 ----------------- > > drivers/media/platform/mtk-mdp/mtk_mdp_comp.h | 2 - > > drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 1 - > > .../media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c | 21 ---------- > > drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h | 3 -- > > drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c | 1 - > > .../media/platform/mtk-vcodec/mtk_vcodec_enc_pm.c | 47 ---------------------- > > drivers/memory/mtk-smi.c | 31 ++++---------- > > include/soc/mediatek/smi.h | 20 --------- > > 23 files changed, 36 insertions(+), 316 deletions(-) > > > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel