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([2a0d:e487:135f:84f0:a520:10fa:2386:b410]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-499dca8c75csm19644365e9.2.2026.08.26.02.02.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 Aug 2026 02:02:43 -0700 (PDT) Message-ID: <048697c8-8331-42aa-accf-d114774ac5fd@linaro.org> Date: Wed, 26 Aug 2026 11:02:41 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Neil Armstrong Subject: Re: [RFC] clk: meson: t7: Intermittent boot instability and memory corruption on VIM4 To: Lucas Tanure , Jerome Brunet , Michael Turquette , Stephen Boyd , Kevin Hilman , Jian Hu Cc: Brian Masney , Martin Blumenstingl , linux-amlogic@lists.infradead.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <3930906f-783b-4d72-9260-ba25cc8081cb@linux.com> Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro In-Reply-To: <3930906f-783b-4d72-9260-ba25cc8081cb@linux.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260826_020247_130687_23522C40 X-CRM114-Status: GOOD ( 16.67 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Neil Armstrong Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 8/23/26 17:40, Lucas Tanure wrote: > Hi, > > While testing mainline Linux on the Khadas VIM4 (Amlogic A311D2 / T7), I am hitting intermittent system instability, storage loss, and memory corruption during boot, unless I append clk_ignore_unused to the kernel command line. > > Because the failure is intermittent, I am running 100-reboot test campaigns to bisect the remaining clocks and isolate which clocks are critical and cannot be safely disabled. > > As testing takes significant time over serial console, I wanted to check if Amlogic or the maintainers could shed light on this: > > Are there specific T7 clocks or hardware domains that must remain critical/protected even without an explicit in-kernel consumer? > > Current clocks being disabled that don't kill the board on a test run: > > [    0.380313] clk: Disabling unused clocks > [    0.380413] clk: Disabled unused clock: rtc_dualdiv > [    0.380718] clk: Disabled unused clock: rtc_duandiv_in Those could be used by low power stuff aswell, not only RTC > [    0.381377] clk: Unprepared unused clock: a73_div16 > [    0.381972] clk: Unprepared unused clock: cpu_div16 Those should probably be left enabled if they're used by the DVFS code > [    0.382605] clk: Unprepared unused clock: f50m > [    0.383174] clk: Unprepared unused clock: fixed_pll_dco > [    0.383786] clk: Unprepared unused clock: hdmi_pll_osc > [    0.384416] clk: Unprepared unused clock: sys1_pll_osc > [    0.385056] clk: Unprepared unused clock: earc_osc > [    0.385652] clk: Unprepared unused clock: pcie_refclk_osc > [    0.386323] clk: Unprepared unused clock: eth_pll_osc > [    0.386961] clk: Unprepared unused clock: pcie_osc > [    0.387548] clk: Unprepared unused clock: mclk_pll_osc > [    0.388187] clk: Unprepared unused clock: usb_pll1_osc > [    0.388826] clk: Unprepared unused clock: usb_pll0_osc > [    0.389465] clk: Unprepared unused clock: tcon_pll_osc > [    0.390105] clk: Unprepared unused clock: top_pll_osc > [    0.390738] clk: Unprepared unused clock: aud_pll_osc > [    0.391361] clk: Unprepared unused clock: ddr_pll_osc > > I am not forcing any clock to be disabled; I am forcing all clocks to stay on and letting them be disabled if unused one by one. > > Any guidance or hints on required platform clocks would be greatly appreciated. It's hard to say, this is dependent on each family, Amlogic should be able to help here. You list some clocks, but I don't understand you say that it's stable only if you have clk_ignore_unused, so how did you get this clock list ? 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([2a0d:e487:135f:84f0:a520:10fa:2386:b410]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-499dca8c75csm19644365e9.2.2026.08.26.02.02.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 Aug 2026 02:02:43 -0700 (PDT) Message-ID: <048697c8-8331-42aa-accf-d114774ac5fd@linaro.org> Date: Wed, 26 Aug 2026 11:02:41 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Neil Armstrong Subject: Re: [RFC] clk: meson: t7: Intermittent boot instability and memory corruption on VIM4 To: Lucas Tanure , Jerome Brunet , Michael Turquette , Stephen Boyd , Kevin Hilman , Jian Hu Cc: Brian Masney , Martin Blumenstingl , linux-amlogic@lists.infradead.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <3930906f-783b-4d72-9260-ba25cc8081cb@linux.com> Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro In-Reply-To: <3930906f-783b-4d72-9260-ba25cc8081cb@linux.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260826_020247_129840_F293B6CD X-CRM114-Status: GOOD ( 15.27 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Neil Armstrong Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org T24gOC8yMy8yNiAxNzo0MCwgTHVjYXMgVGFudXJlIHdyb3RlOgo+IEhpLAo+IAo+IFdoaWxlIHRl c3RpbmcgbWFpbmxpbmUgTGludXggb24gdGhlIEtoYWRhcyBWSU00IChBbWxvZ2ljIEEzMTFEMiAv IFQ3KSwgSSBhbSBoaXR0aW5nIGludGVybWl0dGVudCBzeXN0ZW0gaW5zdGFiaWxpdHksIHN0b3Jh Z2UgbG9zcywgYW5kIG1lbW9yeSBjb3JydXB0aW9uIGR1cmluZyBib290LCB1bmxlc3MgSSBhcHBl bmQgY2xrX2lnbm9yZV91bnVzZWQgdG8gdGhlIGtlcm5lbCBjb21tYW5kIGxpbmUuCj4gCj4gQmVj YXVzZSB0aGUgZmFpbHVyZSBpcyBpbnRlcm1pdHRlbnQsIEkgYW0gcnVubmluZyAxMDAtcmVib290 IHRlc3QgY2FtcGFpZ25zIHRvIGJpc2VjdCB0aGUgcmVtYWluaW5nIGNsb2NrcyBhbmQgaXNvbGF0 ZSB3aGljaCBjbG9ja3MgYXJlIGNyaXRpY2FsIGFuZCBjYW5ub3QgYmUgc2FmZWx5IGRpc2FibGVk Lgo+IAo+IEFzIHRlc3RpbmcgdGFrZXMgc2lnbmlmaWNhbnQgdGltZSBvdmVyIHNlcmlhbCBjb25z b2xlLCBJIHdhbnRlZCB0byBjaGVjayBpZiBBbWxvZ2ljIG9yIHRoZSBtYWludGFpbmVycyBjb3Vs ZCBzaGVkIGxpZ2h0IG9uIHRoaXM6Cj4gCj4gQXJlIHRoZXJlIHNwZWNpZmljIFQ3IGNsb2NrcyBv ciBoYXJkd2FyZSBkb21haW5zIHRoYXQgbXVzdCByZW1haW4gY3JpdGljYWwvcHJvdGVjdGVkIGV2 ZW4gd2l0aG91dCBhbiBleHBsaWNpdCBpbi1rZXJuZWwgY29uc3VtZXI/Cj4gCj4gQ3VycmVudCBj bG9ja3MgYmVpbmcgZGlzYWJsZWQgdGhhdCBkb24ndCBraWxsIHRoZSBib2FyZCBvbiBhIHRlc3Qg cnVuOgo+IAo+IFvCoMKgwqAgMC4zODAzMTNdIGNsazogRGlzYWJsaW5nIHVudXNlZCBjbG9ja3MK PiBbwqDCoMKgIDAuMzgwNDEzXSBjbGs6IERpc2FibGVkIHVudXNlZCBjbG9jazogcnRjX2R1YWxk aXYKPiBbwqDCoMKgIDAuMzgwNzE4XSBjbGs6IERpc2FibGVkIHVudXNlZCBjbG9jazogcnRjX2R1 YW5kaXZfaW4KClRob3NlIGNvdWxkIGJlIHVzZWQgYnkgbG93IHBvd2VyIHN0dWZmIGFzd2VsbCwg bm90IG9ubHkgUlRDCgo+IFvCoMKgwqAgMC4zODEzNzddIGNsazogVW5wcmVwYXJlZCB1bnVzZWQg Y2xvY2s6IGE3M19kaXYxNgo+IFvCoMKgwqAgMC4zODE5NzJdIGNsazogVW5wcmVwYXJlZCB1bnVz ZWQgY2xvY2s6IGNwdV9kaXYxNgoKVGhvc2Ugc2hvdWxkIHByb2JhYmx5IGJlIGxlZnQgZW5hYmxl ZCBpZiB0aGV5J3JlIHVzZWQgYnkgdGhlIERWRlMgY29kZQoKPiBbwqDCoMKgIDAuMzgyNjA1XSBj bGs6IFVucHJlcGFyZWQgdW51c2VkIGNsb2NrOiBmNTBtCj4gW8KgwqDCoCAwLjM4MzE3NF0gY2xr OiBVbnByZXBhcmVkIHVudXNlZCBjbG9jazogZml4ZWRfcGxsX2Rjbwo+IFvCoMKgwqAgMC4zODM3 ODZdIGNsazogVW5wcmVwYXJlZCB1bnVzZWQgY2xvY2s6IGhkbWlfcGxsX29zYwo+IFvCoMKgwqAg MC4zODQ0MTZdIGNsazogVW5wcmVwYXJlZCB1bnVzZWQgY2xvY2s6IHN5czFfcGxsX29zYwo+IFvC oMKgwqAgMC4zODUwNTZdIGNsazogVW5wcmVwYXJlZCB1bnVzZWQgY2xvY2s6IGVhcmNfb3NjCj4g W8KgwqDCoCAwLjM4NTY1Ml0gY2xrOiBVbnByZXBhcmVkIHVudXNlZCBjbG9jazogcGNpZV9yZWZj bGtfb3NjCj4gW8KgwqDCoCAwLjM4NjMyM10gY2xrOiBVbnByZXBhcmVkIHVudXNlZCBjbG9jazog ZXRoX3BsbF9vc2MKPiBbwqDCoMKgIDAuMzg2OTYxXSBjbGs6IFVucHJlcGFyZWQgdW51c2VkIGNs b2NrOiBwY2llX29zYwo+IFvCoMKgwqAgMC4zODc1NDhdIGNsazogVW5wcmVwYXJlZCB1bnVzZWQg Y2xvY2s6IG1jbGtfcGxsX29zYwo+IFvCoMKgwqAgMC4zODgxODddIGNsazogVW5wcmVwYXJlZCB1 bnVzZWQgY2xvY2s6IHVzYl9wbGwxX29zYwo+IFvCoMKgwqAgMC4zODg4MjZdIGNsazogVW5wcmVw YXJlZCB1bnVzZWQgY2xvY2s6IHVzYl9wbGwwX29zYwo+IFvCoMKgwqAgMC4zODk0NjVdIGNsazog VW5wcmVwYXJlZCB1bnVzZWQgY2xvY2s6IHRjb25fcGxsX29zYwo+IFvCoMKgwqAgMC4zOTAxMDVd IGNsazogVW5wcmVwYXJlZCB1bnVzZWQgY2xvY2s6IHRvcF9wbGxfb3NjCj4gW8KgwqDCoCAwLjM5 MDczOF0gY2xrOiBVbnByZXBhcmVkIHVudXNlZCBjbG9jazogYXVkX3BsbF9vc2MKPiBbwqDCoMKg IDAuMzkxMzYxXSBjbGs6IFVucHJlcGFyZWQgdW51c2VkIGNsb2NrOiBkZHJfcGxsX29zYwo+IAo+ IEkgYW0gbm90IGZvcmNpbmcgYW55IGNsb2NrIHRvIGJlIGRpc2FibGVkOyBJIGFtIGZvcmNpbmcg YWxsIGNsb2NrcyB0byBzdGF5IG9uIGFuZCBsZXR0aW5nIHRoZW0gYmUgZGlzYWJsZWQgaWYgdW51 c2VkIG9uZSBieSBvbmUuCj4gCj4gQW55IGd1aWRhbmNlIG9yIGhpbnRzIG9uIHJlcXVpcmVkIHBs YXRmb3JtIGNsb2NrcyB3b3VsZCBiZSBncmVhdGx5IGFwcHJlY2lhdGVkLgoKSXQncyBoYXJkIHRv IHNheSwgdGhpcyBpcyBkZXBlbmRlbnQgb24gZWFjaCBmYW1pbHksIEFtbG9naWMgc2hvdWxkIGJl IGFibGUgdG8gaGVscCBoZXJlLgoKWW91IGxpc3Qgc29tZSBjbG9ja3MsIGJ1dCBJIGRvbid0IHVu ZGVyc3RhbmQgeW91IHNheSB0aGF0IGl0J3Mgc3RhYmxlIG9ubHkgaWYgeW91IGhhdmUgY2xrX2ln bm9yZV91bnVzZWQsIHNvIGhvdyBkaWQgeW91IGdldCB0aGlzIGNsb2NrIGxpc3QgPwoKTmVpbAoK PiAKPiBUaGFua3MsCj4gTHVjYXMgVGFudXJlCgoKX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX18KbGludXgtYW1sb2dpYyBtYWlsaW5nIGxpc3QKbGludXgtYW1s b2dpY0BsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxt YW4vbGlzdGluZm8vbGludXgtYW1sb2dpYwo=