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Mon, 06 Feb 2023 08:12:38 -0800 (PST) Received: from [192.168.1.109] ([178.197.216.144]) by smtp.gmail.com with ESMTPSA id r12-20020a05600c35cc00b003d9fba3c7a4sm17816889wmq.16.2023.02.06.08.12.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 06 Feb 2023 08:12:37 -0800 (PST) Message-ID: Date: Mon, 6 Feb 2023 17:12:35 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.1 Subject: Re: [PATCH 5/9] ARM: dts: exynos: move exynos-bus nodes out of soc in Exynos4412 Content-Language: en-US To: Marek Szyprowski , Rob Herring , Krzysztof Kozlowski , Alim Akhtar , Kukjin Kim , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org Cc: replicant@osuosl.org, phone-devel@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht, =?UTF-8?Q?Martin_J=c3=bccker?= , Henrik Grimler , Chanwoo Choi References: <20230125094513.155063-1-krzysztof.kozlowski@linaro.org> <20230125094513.155063-5-krzysztof.kozlowski@linaro.org> <29841f64-360b-1426-e1fd-dd4c64ee5455@linaro.org> <111f7364-0d7b-b4c5-721f-69c00d4619e2@samsung.com> <697aa7b5-9c9b-eb4f-8111-c9a396d9d191@linaro.org> <6a9fcdc9-3fe7-e8fc-3a51-385d516c6323@samsung.com> From: Krzysztof Kozlowski In-Reply-To: <6a9fcdc9-3fe7-e8fc-3a51-385d516c6323@samsung.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/02/2023 23:50, Marek Szyprowski wrote: > On 03.02.2023 22:12, Krzysztof Kozlowski wrote: >> On 03/02/2023 21:34, Krzysztof Kozlowski wrote: >>> On 03/02/2023 12:51, Marek Szyprowski wrote: >>>> On 03.02.2023 12:46, Krzysztof Kozlowski wrote: >>>>> On 03/02/2023 12:45, Marek Szyprowski wrote: >>>>>> On 29.01.2023 11:42, Krzysztof Kozlowski wrote: >>>>>>> On 25/01/2023 10:45, Krzysztof Kozlowski wrote: >>>>>>>> The soc node is supposed to have only device nodes with MMIO addresses, >>>>>>>> as reported by dtc W=1: >>>>>>>> >>>>>>>> exynos4412.dtsi:407.20-413.5: >>>>>>>> Warning (simple_bus_reg): /soc/bus-acp: missing or empty reg/ranges property >>>>>>>> >>>>>>>> and dtbs_check: >>>>>>>> >>>>>>>> exynos4412-i9300.dtb: soc: bus-acp: >>>>>>>> {'compatible': ['samsung,exynos-bus'], 'clocks': [[7, 456]], 'clock-names': ['bus'], 'operating-points-v2': [[132]], 'status': ['okay'], 'devfreq': [[117]]} should not be valid under {'type': 'object'} >>>>>>>> >>>>>>>> Move the bus nodes and their OPP tables out of SoC to fix this. >>>>>>>> Re-order them alphabetically while moving and put some of the OPP tables >>>>>>>> in device nodes (if they are not shared). >>>>>>>> >>>>>>> Applied. >>>>>> I don't have a good news. It looks that this change is responsible for >>>>>> breaking boards that were rock-stable so far, like Odroid U3. I didn't >>>>>> manage to analyze what exactly causes the issue, but it looks that the >>>>>> exynos-bus devfreq driver somehow depends on the order of the nodes: >>>>>> >>>>>> (before) >>>>>> >>>>>> # dmesg | grep exynos-bus >>>>>> [    6.415266] exynos-bus: new bus device registered: soc:bus-dmc >>>>>> (100000 KHz ~ 400000 KHz) >>>>>> [    6.422717] exynos-bus: new bus device registered: soc:bus-acp >>>>>> (100000 KHz ~ 267000 KHz) >>>>>> [    6.454323] exynos-bus: new bus device registered: soc:bus-c2c >>>>>> (100000 KHz ~ 400000 KHz) >>>>>> [    6.489944] exynos-bus: new bus device registered: soc:bus-leftbus >>>>>> (100000 KHz ~ 200000 KHz) >>>>>> [    6.493990] exynos-bus: new bus device registered: soc:bus-rightbus >>>>>> (100000 KHz ~ 200000 KHz) >>>>>> [    6.494612] exynos-bus: new bus device registered: soc:bus-display >>>>>> (160000 KHz ~ 200000 KHz) >>>>>> [    6.494932] exynos-bus: new bus device registered: soc:bus-fsys >>>>>> (100000 KHz ~ 134000 KHz) >>>>>> [    6.495246] exynos-bus: new bus device registered: soc:bus-peri ( >>>>>> 50000 KHz ~ 100000 KHz) >>>>>> [    6.495577] exynos-bus: new bus device registered: soc:bus-mfc >>>>>> (100000 KHz ~ 200000 KHz) >>>>>> >>>>>> (after) >>>>>> >>>>>> # dmesg | grep exynos-bus >>>>>> >>>>>> [    6.082032] exynos-bus: new bus device registered: bus-dmc (100000 >>>>>> KHz ~ 400000 KHz) >>>>>> [    6.122726] exynos-bus: new bus device registered: bus-leftbus >>>>>> (100000 KHz ~ 200000 KHz) >>>>>> [    6.146705] exynos-bus: new bus device registered: bus-mfc (100000 >>>>>> KHz ~ 200000 KHz) >>>>>> [    6.181632] exynos-bus: new bus device registered: bus-peri ( 50000 >>>>>> KHz ~ 100000 KHz) >>>>>> [    6.204770] exynos-bus: new bus device registered: bus-rightbus >>>>>> (100000 KHz ~ 200000 KHz) >>>>>> [    6.211087] exynos-bus: new bus device registered: bus-acp (100000 >>>>>> KHz ~ 267000 KHz) >>>>>> [    6.216936] exynos-bus: new bus device registered: bus-c2c (100000 >>>>>> KHz ~ 400000 KHz) >>>>>> [    6.225748] exynos-bus: new bus device registered: bus-display >>>>>> (160000 KHz ~ 200000 KHz) >>>>>> [    6.242978] exynos-bus: new bus device registered: bus-fsys (100000 >>>>>> KHz ~ 134000 KHz) >>>>>> >>>>>> This is definitely a driver bug, but so far it worked fine, so this is a >>>>>> regression that need to be addressed somehow... >>>>> Thanks for checking, but what is exactly the bug? The devices registered >>>>> - just with different name. >>>> The bug is that the board fails to boot from time to time, freezing >>>> after registering PPMU counters... >>> My U3 with and without this patch, reports several warnings: >>> iommu_group_do_set_platform_dma() >>> exynos_iommu_domain_free() >>> clk_core_enable() >>> >>> and finally: >>> rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: >>> >>> and keeps stalling. >>> >>> At least on next-20230203. Except all these (which anyway make board >>> unbootable) look fine around PMU and exynos-bus. >> I also booted few times my next/dt branch (with this patch) and no >> problems. How reproducible is the issue you experience? > > IOMMU needs a fixup, that has been merged today: > > https://lore.kernel.org/all/20230123093102.12392-1-m.szyprowski@samsung.com/ > > I was initially convinced that this freeze is somehow related to this > IOMMU fixup, but it turned out that the devfreq is a source of the problems. > > The freeze happens here about 1 of 10 boots, usually with kernel > compiled from multi_v7_defconfig, while loading the PPMU modules. It > happens on your next/dt branch too. I was able to reproduce it easily with multi_v7. Then I commented out dmc bus which fixed the issue. Then I commented out acp and c2c buses (children/passive) which also fixed the issue. Then I uncommented everything and went back to next/dt - exactly the same as it was failing - and since then I cannot reproduce it. I triple checked, but now my multi_v7 on U3 on next/dt boots perfectly fine. Every time. Best regards, Krzysztof