qualcommax: ipq50xx: correct assigned cmn pll clock rate

In IPQ5018, the reference clock to the CMN PLL block from the on-board
Wi-Fi has its divider set to 2. This divider wasn't taken into
consideration when calculating the CMN PLL clock rate which meant the
resulting clock rate was doubled.

With the reference clock divider being accounted for in the driver,
correct the assigned clock rate to 4.8GHz.

Signed-off-by: George Moussalem <george.moussalem@outlook.com>
Link: https://github.com/openwrt/openwrt/pull/21453
Signed-off-by: Robert Marko <robimarko@gmail.com>

diff --git a/target/linux/qualcommax/patches-6.12/0190-clk-qcom-cmnpll-Account-for-reference-clock-divider.patch b/target/linux/qualcommax/patches-6.12/0190-clk-qcom-cmnpll-Account-for-reference-clock-divider.patch
new file mode 100644 (file)
index 0000000..089075a
--- /dev/null
+++ b/target/linux/qualcommax/patches-6.12/0190-clk-qcom-cmnpll-Account-for-reference-clock-divider.patch
@@ -0,0 +1,47 @@
+From: Luo Jie <jie.luo@oss.qualcomm.com>
+Date: Tue, 06 Jan 2026 21:35:10 -0800
+Subject: [PATCH v2 1/5] clk: qcom: cmnpll: Account for reference clock divider
+
+The clk_cmn_pll_recalc_rate() function must account for the reference clock
+divider programmed in CMN_PLL_REFCLK_CONFIG. Without this fix, platforms
+with a reference divider other than 1 calculate incorrect CMN PLL rates.
+For example, on IPQ5332 where the reference divider is 2, the computed rate
+becomes twice the actual output.
+
+Read CMN_PLL_REFCLK_DIV and divide the parent rate by this value before
+applying the 2 * FACTOR scaling. This yields the correct rate calculation:
+rate = (parent_rate / ref_div) * 2 * factor.
+
+Maintain backward compatibility with earlier platforms (e.g. IPQ9574,
+IPQ5424, IPQ5018) that use ref_div = 1.
+
+Fixes: f81715a4c87c ("clk: qcom: Add CMN PLL clock controller driver for IPQ SoC")
+Signed-off-by: Luo Jie <jie.luo@oss.qualcomm.com>
+--- a/drivers/clk/qcom/ipq-cmn-pll.c
++++ b/drivers/clk/qcom/ipq-cmn-pll.c
+@@ -186,7 +186,7 @@ static unsigned long clk_cmn_pll_recalc_
+                                            unsigned long parent_rate)
+ {
+       struct clk_cmn_pll *cmn_pll = to_clk_cmn_pll(hw);
+-      u32 val, factor;
++      u32 val, factor, ref_div;
+ 
+       /*
+        * The value of CMN_PLL_DIVIDER_CTRL_FACTOR is automatically adjusted
+@@ -194,8 +194,15 @@ static unsigned long clk_cmn_pll_recalc_
+        */
+       regmap_read(cmn_pll->regmap, CMN_PLL_DIVIDER_CTRL, &val);
+       factor = FIELD_GET(CMN_PLL_DIVIDER_CTRL_FACTOR, val);
++      if (WARN_ON(factor == 0))
++              factor = 1;
+ 
+-      return parent_rate * 2 * factor;
++      regmap_read(cmn_pll->regmap, CMN_PLL_REFCLK_CONFIG, &val);
++      ref_div = FIELD_GET(CMN_PLL_REFCLK_DIV, val);
++      if (WARN_ON(ref_div == 0))
++              ref_div = 1;
++
++      return div_u64((u64)parent_rate * 2 * factor, ref_div);
+ }
+ 
+ static int clk_cmn_pll_determine_rate(struct clk_hw *hw,

diff --git a/target/linux/qualcommax/patches-6.12/0818-arm64-dts-qcom-ipq5018-fix-assigned-cmn-pll-clock-rate.patch b/target/linux/qualcommax/patches-6.12/0818-arm64-dts-qcom-ipq5018-fix-assigned-cmn-pll-clock-rate.patch
new file mode 100644 (file)
index 0000000..6ab9ba3
--- /dev/null
+++ b/target/linux/qualcommax/patches-6.12/0818-arm64-dts-qcom-ipq5018-fix-assigned-cmn-pll-clock-rate.patch
@@ -0,0 +1,34 @@
+From 5b00a1e17e98e99cc31b4dc6584b9ef93b8a62c4 Mon Sep 17 00:00:00 2001
+From: George Moussalem <george.moussalem@outlook.com>
+Date: Wed, 07 Jan 2026 18:21:49 +0400
+Subject: [PATCH] arm64: dts: qcom: ipq5018: fix assigned cmn-pll clock rate
+MIME-Version: 1.0
+Content-Type: text/plain; charset="utf-8"
+Content-Transfer-Encoding: 7bit
+Message-Id: <20260107-ipq5018-cmn-pll-rate-v1-6-9ab50c40cb32@outlook.com>
+
+In IPQ5018, the reference clock to the CMN PLL block from the on-board
+Wi-Fi has its divider set to 2. This divider wasn't taken into
+consideration when calculating the CMN PLL clock rate which meant the
+resulting clock rate was doubled.
+
+With the reference clock divider being accounted for in the driver,
+correct the assigned clock rate to 4.8GHz.
+
+Fixes: c006b249c544 ("arm64: dts: ipq5018: Add CMN PLL node")
+Signed-off-by: George Moussalem <george.moussalem@outlook.com>
+---
+ arch/arm64/boot/dts/qcom/ipq5018.dtsi | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/arch/arm64/boot/dts/qcom/ipq5018.dtsi
++++ b/arch/arm64/boot/dts/qcom/ipq5018.dtsi
+@@ -266,7 +266,7 @@
+                                     "sys";
+                       #clock-cells = <1>;
+                       assigned-clocks = <&cmn_pll IPQ5018_CMN_PLL_CLK>;
+-                      assigned-clock-rates-u64 = /bits/ 64 <9600000000>;
++                      assigned-clock-rates-u64 = /bits/ 64 <4800000000>;
+               };
+ 
+               qfprom: qfprom@a0000 {