linux-kernel - Re: [PATCH] clk: qcom: gdsc: Add a flag to skip setting power collapse bits

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Message-ID: <1893aa81-89f0-459e-b5b5-9973014ed1e6@quicinc.com>
Date: Sat, 24 Aug 2024 02:13:00 +0300
From: Georgi Djakov <quic_c_gdjako@...cinc.com>
To: Stephen Boyd <sboyd@...nel.org>, <andersson@...nel.org>,
        <quic_mdtipton@...cinc.com>, <quic_viveka@...cinc.com>
CC: <mturquette@...libre.com>, <linux-arm-msm@...r.kernel.org>,
        <linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: qcom: gdsc: Add a flag to skip setting power
 collapse bits

On 8/17/2024 12:48 AM, Stephen Boyd wrote:
> Quoting Georgi Djakov (2024-08-13 05:00:15)
>> The sdm845 platforms have a hardware issue that requires keeping
>> some of the MMNOC GDSCs in SW collapse mode (which is the power-on
>> default). But if some driver tries to use these GDSCs and the mode
>> is updated because of runtime pm calls, we may get a board hang.
>> Introduce a flag to skip any updates to the power collapse settings
>> for the impacted GDSCs to avoid unexpected board hangs.
> 
> Can you add a Fixes tag? And does this need to go to stable kernels?

These GDSCs got a user in v6.11-rc1 and there is currently a workaround
in place to avoid the hang, but this patch is the proper way to handle
it. Getting it into either fixes or next is both fine. There is no need
to backport it, as these GDSCs are not used on older kernels.

Thanks,
Georgi