linux-kernel - Re: [PATCH] clk: qcom: apss-ipq-pll: use stromer ops for IPQ5018 to fix boot failure

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Message-ID: <690cba7c-4362-4e19-8573-ab20b8119ae2@quicinc.com>
Date: Wed, 13 Mar 2024 09:56:25 +0530
From: Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>
To: Gabor Juhos <j4g8y7@...il.com>, Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Michael Turquette
	<mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Sricharan
 Ramabadhran" <quic_srichara@...cinc.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>,
        Gokul Sriram Palanisamy
	<quic_gokulsri@...cinc.com>
CC: <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [PATCH] clk: qcom: apss-ipq-pll: use stromer ops for IPQ5018 to
 fix boot failure



On 3/11/2024 8:36 PM, Gabor Juhos wrote:
> Booting v6.8 results in a hang on various IPQ5018 based boards.
> Investigating the problem showed that the hang happens when the
> clk_alpha_pll_stromer_plus_set_rate() function tries to write
> into the PLL_MODE register of the APSS PLL.
> 
> Checking the downstream code revealed that it uses [1] stromer
> specific operations for IPQ5018, whereas in the current code
> the stromer plus specific operations are used.
> 
> The ops in the 'ipq_pll_stromer_plus' clock definition can't be
> changed since that is needed for IPQ5332, so add a new alpha pll
> clock declaration which uses the correct stromer ops and use this
> new clock for IPQ5018 to avoid the boot failure.
> 
> 1. https://git.codelinaro.org/clo/qsdk/oss/kernel/linux-ipq-5.4/-/blob/NHSS.QSDK.12.4/drivers/clk/qcom/apss-ipq5018.c#L67


Thanks for catching this!

Tested-by: Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>
Reviewed-by: Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>


> 
> Cc: stable@...r.kernel.org
> Fixes: 50492f929486 ("clk: qcom: apss-ipq-pll: add support for IPQ5018")
> Signed-off-by: Gabor Juhos <j4g8y7@...il.com>
> ---
> Based on v6.8.
> ---
>   drivers/clk/qcom/apss-ipq-pll.c | 20 +++++++++++++++++++-
>   1 file changed, 19 insertions(+), 1 deletion(-)