linux-kernel - Re: [PATCH] clk: qcom: gcc-sm8450: set OPS_PARENT_ENABLE on gcc_sdcc2_apps_clk

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Date: Tue, 7 May 2024 23:17:01 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Stephen Boyd <sboyd@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Vinod Koul <vkoul@...nel.org>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>,
 linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
 linux-kernel@...r.kernel.org, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH] clk: qcom: gcc-sm8450: set OPS_PARENT_ENABLE on
 gcc_sdcc2_apps_clk_src



On 5/7/24 22:28, Stephen Boyd wrote:
> Quoting Konrad Dybcio (2024-05-07 06:51:04)
>>
>> without PARENT_OPS_ENABLE:
>>
>> [    3.326891] sdhci_msm 8804000.mmc: Got CD GPIO
>> [    3.336839] scsi host0: ufshcd
>> [    3.337105] gcc_sdcc2_apps_clk_src is DISABLED @ set_rate
>> [    3.346339] ------------[ cut here ]------------
>> [    3.351093] gcc_sdcc2_apps_clk_src: rcg didn't update its configuration.
>> [    3.351114] WARNING: CPU: 1 PID: 11 at drivers/clk/qcom/clk-rcg2.c:133 update_config+0xc8/0xd8
>>
>> [...]
>>
>> [    3.610523] gcc_sdcc2_apps_clk_src is ENABLED @ set_rate
>>
>>
>> with PARENT_OPS_ENABLE:
>>
>> [    3.331419] sdhci_msm 8804000.mmc: Got CD GPIO
>> [    3.336569] gcc_sdcc2_apps_clk_src is DISABLED @ set_rate
>> [    3.344795] scsi host0: ufshcd
>> [    3.355122] qcrypto 1dfa000.crypto: Adding to iommu group 5
>> [    3.363567] remoteproc remoteproc0: 2400000.remoteproc is available
>> [    3.364729] gcc_sdcc2_apps_clk_src is ENABLED @ set_rate
>>
>> after testing it both ways, I realized it wasn't supposed to make a
>> difference in this regard, but I suppose I can paste both results anyway..
>>
> 
> Can you share your patch that prints the message? What bit are you
> checking in the hardware to determine if the RCG is enabled? Do you also
> print the enable count in software?

I already reset-ed the tree state, but I added something like

if (rcg->cmd_rcgr == the one in the declaration)
	pr_err("gcc_sdcc2_apps_clk_src is %s\n", clk_is_enabled(hw) ? "ENABLED" : "DISABLED");

to drivers/clk/qcom/clk-rcg2.c : __clk_rcg2_set_rate()

Konrad