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From: Ajit Pandey <quic_ajipan@quicinc.com>
To: Michael Turquette <mturquette@baylibre.com>,
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	<konrad.dybcio@linaro.org>,
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        Vladimir Zapolskiy
	<vladimir.zapolskiy@linaro.org>
CC: <linux-arm-msm@vger.kernel.org>, <linux-clk@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        Taniya Das
	<quic_tdas@quicinc.com>,
        Jagadeesh Kona <quic_jkona@quicinc.com>,
        Imran Shaik
	<quic_imrashai@quicinc.com>,
        Satya Priya Kakitapalli
	<quic_skakitap@quicinc.com>,
        Ajit Pandey <quic_ajipan@quicinc.com>, <stable@vger.kernel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Subject: [PATCH V3 1/8] clk: qcom: clk-alpha-pll: Fix CAL_L_VAL override for LUCID EVO PLL
Date: Tue, 28 May 2024 17:12:47 +0530
Message-ID: <20240528114254.3147988-2-quic_ajipan@quicinc.com>
In-Reply-To: <20240528114254.3147988-1-quic_ajipan@quicinc.com>
References: <20240528114254.3147988-1-quic_ajipan@quicinc.com>
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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@vger.kernel.org
Signed-off-by: Ajit Pandey <quic_ajipan@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.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 d4227909d1fe..62138ed3df88 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -1665,7 +1665,7 @@ 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