linux-kernel - Re: [PATCH V2 1/8] clk: qcom: clk-alpha-pll: Fix CAL_L

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Date: Tue, 16 Apr 2024 21:52:05 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Ajit Pandey <quic_ajipan@...cinc.com>
Cc: 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>, 
	Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>, 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
Subject: Re: [PATCH V2 1/8] clk: qcom: clk-alpha-pll: Fix CAL_L_VAL override
 for LUCID EVO PLL

On Tue, 16 Apr 2024 at 21:21, Ajit Pandey <quic_ajipan@...cinc.com> 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")
> Signed-off-by: Ajit Pandey <quic_ajipan@...cinc.com>
> Cc: stable@...r.kernel.org

S-o-B tag should be the last one. With that fixed:

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> ---
>  drivers/clk/qcom/clk-alpha-pll.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
> index 8a412ef47e16..81cabd28eabe 100644
> --- a/drivers/clk/qcom/clk-alpha-pll.c
> +++ b/drivers/clk/qcom/clk-alpha-pll.c
> @@ -1656,7 +1656,7 @@ static int __alpha_pll_trion_set_rate(struct clk_hw *hw, unsigned long rate,
>         if (ret < 0)
>                 return ret;
>
> -       regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l);
> +       regmap_update_bits(pll->clkr.regmap, PLL_L_VAL(pll), LUCID_EVO_PLL_L_VAL_MASK,  l);
>         regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a);
>
>         /* Latch the PLL input */
> --
> 2.25.1
>
>


-- 
With best wishes
Dmitry