openwrt/target/linux/brcm2708/patches-4.19/950-0772-raspberrypi-cpufreq-Only-report-integer-pll-divisor-.patch

From 1c038a58f4183602fc1699d68b21f5e22a12176d Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Fri, 13 Sep 2019 13:45:11 +0100
Subject: [PATCH] raspberrypi-cpufreq: Only report integer pll divisor
 frequencies

---
 drivers/cpufreq/raspberrypi-cpufreq.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/cpufreq/raspberrypi-cpufreq.c
+++ b/drivers/cpufreq/raspberrypi-cpufreq.c
@@ -8,6 +8,7 @@
 #include <linux/clk.h>
 #include <linux/cpu.h>
 #include <linux/cpufreq.h>
+#include <linux/math64.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/pm_opp.h>
@@ -22,6 +23,7 @@ static int raspberrypi_cpufreq_probe(str
 	unsigned long min, max;
 	unsigned long rate;
 	struct clk *clk;
+	int div;
 	int ret;
 
 	cpu_dev = get_cpu_device(0);
@@ -44,7 +46,10 @@ static int raspberrypi_cpufreq_probe(str
 	max = roundup(clk_round_rate(clk, ULONG_MAX), RASPBERRYPI_FREQ_INTERVAL);
 	clk_put(clk);
 
-	for (rate = min; rate <= max; rate += RASPBERRYPI_FREQ_INTERVAL) {
+	for (div = 2; ; div++) {
+		rate = div_u64((u64)max * 2, div);
+		if (rate < min)
+			break;
 		ret = dev_pm_opp_add(cpu_dev, rate, 0);
 		if (ret)
 			goto remove_opp;