linux-kernel - [PATCH] clk: qcom: apss-ipq-pll: fix PLL rate for IPQ5018

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Message-Id: <20240326-fix-ipq5018-apss-pll-rate-v1-1-82ab31c9da7e@gmail.com>
Date: Tue, 26 Mar 2024 14:34:11 +0100
From: Gabor Juhos <j4g8y7@...il.com>
To: 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>, 
 Gokul Sriram Palanisamy <quic_gokulsri@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Gabor Juhos <j4g8y7@...il.com>
Subject: [PATCH] clk: qcom: apss-ipq-pll: fix PLL rate for IPQ5018

According to ipq5018.dtsi, the maximum supported rate by the
CPU is 1.008 GHz on the IPQ5018 platform, however the current
configuration of the PLL results in 1.2 GHz rate.

Change the 'L' value in the PLL configuration to limit the
rate to 1.008 GHz. The downstream kernel also uses the same
value [1]. Also add a comment to indicate the desired
frequency.

[1] https://git.codelinaro.org/clo/qsdk/oss/kernel/linux-ipq-5.4/-/blob/NHSS.QSDK.12.4/drivers/clk/qcom/apss-ipq5018.c?ref_type=heads#L151

Fixes: 50492f929486 ("clk: qcom: apss-ipq-pll: add support for IPQ5018")
Signed-off-by: Gabor Juhos <j4g8y7@...il.com>
---
Based on v6.9-rc1.

Note: The change is independent from the "clk: qcom: apss-ipq-pll: various
cleanups" series posted earlier [2].

[2] https://lore.kernel.org/r/20240326-apss-ipq-pll-cleanup-v3-0-15c4aeeb14ac@gmail.com
---
 drivers/clk/qcom/apss-ipq-pll.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/apss-ipq-pll.c b/drivers/clk/qcom/apss-ipq-pll.c
index 678b805f13d45..5e3da5558f4e0 100644
--- a/drivers/clk/qcom/apss-ipq-pll.c
+++ b/drivers/clk/qcom/apss-ipq-pll.c
@@ -73,8 +73,9 @@ static struct clk_alpha_pll ipq_pll_stromer_plus = {
 	},
 };
 
+/* 1.008 GHz configuration */
 static const struct alpha_pll_config ipq5018_pll_config = {
-	.l = 0x32,
+	.l = 0x2a,
 	.config_ctl_val = 0x4001075b,
 	.config_ctl_hi_val = 0x304,
 	.main_output_mask = BIT(0),

---
base-commit: 4cece764965020c22cff7665b18a012006359095
change-id: 20240326-fix-ipq5018-apss-pll-rate-fed3ab51b1c2

Best regards,
-- 
Gabor Juhos <j4g8y7@...il.com>