linux-kernel - Re: [PATCH V4 1/8] clk: qcom: clk-alpha-pll: Fix CAL_L

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Date: Thu, 13 Jun 2024 11:19:34 +0300
From: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
To: Ajit Pandey <quic_ajipan@...cinc.com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>, Vinod Koul <vkoul@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Taniya Das <quic_tdas@...cinc.com>, Jagadeesh Kona <quic_jkona@...cinc.com>,
 Imran Shaik <quic_imrashai@...cinc.com>,
 Satya Priya Kakitapalli <quic_skakitap@...cinc.com>, stable@...r.kernel.org,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH V4 1/8] clk: qcom: clk-alpha-pll: Fix CAL_L_VAL override
 for LUCID EVO PLL

Hi Ajit,

On 6/11/24 16:37, Ajit Pandey wrote:
> In LUCID EVO PLL CAL_L_VAL and L_VAL bitfields are part of single
> PLL_L_VAL register. Update for L_VAL bitfield values in PLL_L_VAL
> register using regmap_write() API in __alpha_pll_trion_set_rate
> callback will override LUCID EVO PLL initial configuration related
> to PLL_CAL_L_VAL bit fields in PLL_L_VAL register.
> 
> Observed random PLL lock failures during PLL enable due to such
> override in PLL calibration value. Use regmap_update_bits() with
> L_VAL bitfield mask instead of regmap_write() API to update only
> PLL_L_VAL bitfields in __alpha_pll_trion_set_rate callback.
> 
> Fixes: 260e36606a03 ("clk: qcom: clk-alpha-pll: add Lucid EVO PLL configuration interfaces")
> Cc: stable@...r.kernel.org
> Signed-off-by: Ajit Pandey <quic_ajipan@...cinc.com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

thank you for the fix!

Acked-by: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>

--
Best wishes,
Vladimir