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Message-ID: <3bb632e4-67ad-43d8-9b7f-6e55880b0bd7@linaro.org>
Date: Mon, 15 Jan 2024 19:32:30 +0100
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Subject: Re: [PATCH] interconnect: qcom: sm8450: Revert "interconnect: qcom:
 sm8450: Enable sync_state"
To: Konrad Dybcio <konrad.dybcio@linaro.org>,
 Georgi Djakov <djakov@kernel.org>, Bjorn Andersson <andersson@kernel.org>,
 Vinod Koul <vkoul@kernel.org>, linux-arm-msm@vger.kernel.org,
 linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org
References: <20240115153420.1525037-1-krzysztof.kozlowski@linaro.org>
 <201733c1-dc24-4d77-9967-f52c8e81d35b@kernel.org>
 <96928df4-75ca-4a55-829b-b8ab0583e3b5@linaro.org>
 <93bc06a3-8af9-4d50-bfee-d54e04bade51@linaro.org>
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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <93bc06a3-8af9-4d50-bfee-d54e04bade51@linaro.org>
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On 15/01/2024 19:17, Konrad Dybcio wrote:
> On 15.01.2024 18:59, Krzysztof Kozlowski wrote:
>> On 15/01/2024 17:44, Georgi Djakov wrote:
>>> On 15.01.24 17:34, Krzysztof Kozlowski wrote:
>>>> Revert commit 16862f1b2110 ("interconnect: qcom: sm8450: Enable
>>>> sync_state"), because it causes serial console to corrupt, later freeze
>>>> and become either entirely corrupted or only print without accepting any
>>>> input.
>>>
>>> Sounds like some driver is not requesting bandwidth and is relying on
>>> bandwidth requests made by other drivers. Maybe we are missing some
>>> "interconnects" property in DT?
>>
>> Yes, the debug UART (console) misses the interconnects. They could be
>> added but it does not change the fact that console is broken since v6.6
>> and this was probably never tested on actual hardware :/
> 
> This patch? I definitely tested it out on a headless remote board..

OK, then maybe something changed between your tests and when it was
applied? Anyway issue is reproducible 100%. Even older kernel (v6.5)
with your commit cherry-picked fails.

Best regards,
Krzysztof