linux-kernel - [PATCH V3 4/8] clk: qcom: clk-alpha-pll: Update set

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Message-ID: <20240731062916.2680823-5-quic_skakitap@quicinc.com>
Date: Wed, 31 Jul 2024 11:59:12 +0530
From: Satya Priya Kakitapalli <quic_skakitap@...cinc.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio
	<konrad.dybcio@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Abhishek Sahu <absahu@...eaurora.org>,
        "Rob
 Herring" <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
CC: Stephen Boyd <sboyd@...eaurora.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, Ajit Pandey <quic_ajipan@...cinc.com>,
        "Imran
 Shaik" <quic_imrashai@...cinc.com>,
        Taniya Das <quic_tdas@...cinc.com>,
        Jagadeesh Kona <quic_jkona@...cinc.com>, <stable@...r.kernel.org>,
        "Krzysztof
 Kozlowski" <krzysztof.kozlowski@...aro.org>,
        Bryan O'Donoghue
	<bryan.odonoghue@...aro.org>,
        Satya Priya Kakitapalli
	<quic_skakitap@...cinc.com>
Subject: [PATCH V3 4/8] clk: qcom: clk-alpha-pll: Update set_rate for Zonda PLL

The Zonda PLL has a 16 bit signed alpha and in the cases where the alpha
value is greater than 0.5, the L value needs to be adjusted accordingly.
Thus update the logic to handle the signed alpha val.

Fixes: f21b6bfecc27 ("clk: qcom: clk-alpha-pll: add support for zonda pll")
Cc: stable@...r.kernel.org
Signed-off-by: Satya Priya Kakitapalli <quic_skakitap@...cinc.com>
---
 drivers/clk/qcom/clk-alpha-pll.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index 2ebeb277cb4d..ad9a84d521fc 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -41,6 +41,7 @@
 #define PLL_USER_CTL(p)		((p)->offset + (p)->regs[PLL_OFF_USER_CTL])
 # define PLL_POST_DIV_SHIFT	8
 # define PLL_POST_DIV_MASK(p)	GENMASK((p)->width - 1, 0)
+# define PLL_ALPHA_MSB		BIT(15)
 # define PLL_ALPHA_EN		BIT(24)
 # define PLL_ALPHA_MODE		BIT(25)
 # define PLL_VCO_SHIFT		20
@@ -2117,6 +2118,18 @@ static void clk_zonda_pll_disable(struct clk_hw *hw)
 	regmap_write(regmap, PLL_OPMODE(pll), 0x0);
 }
 
+static void zonda_pll_adjust_l_val(unsigned long rate, unsigned long prate, u32 *l)
+{
+	u64 remainder, quotient;
+
+	quotient = rate;
+	remainder = do_div(quotient, prate);
+	*l = quotient;
+
+	if ((remainder * 2) / prate)
+		*l = *l + 1;
+}
+
 static int clk_zonda_pll_set_rate(struct clk_hw *hw, unsigned long rate,
 				  unsigned long prate)
 {
@@ -2133,6 +2146,9 @@ static int clk_zonda_pll_set_rate(struct clk_hw *hw, unsigned long rate,
 	if (ret < 0)
 		return ret;
 
+	if (a & PLL_ALPHA_MSB)
+		zonda_pll_adjust_l_val(rate, prate, &l);
+
 	regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a);
 	regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l);
 
-- 
2.25.1