The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 371a3bc79c11b707d7a1b7a2c938dc3cc042fffb Mon Sep 17 00:00:00 2001
From: Finley Xiao finley.xiao@rock-chips.com Date: Fri, 19 Jun 2020 17:08:25 +0800 Subject: [PATCH] thermal/drivers/cpufreq_cooling: Fix wrong frequency converted from power
The function cpu_power_to_freq is used to find a frequency and set the cooling device to consume at most the power to be converted. For example, if the power to be converted is 80mW, and the em table is as follow. struct em_cap_state table[] = { /* KHz mW */ { 1008000, 36, 0 }, { 1200000, 49, 0 }, { 1296000, 59, 0 }, { 1416000, 72, 0 }, { 1512000, 86, 0 }, }; The target frequency should be 1416000KHz, not 1512000KHz.
Fixes: 349d39dc5739 ("thermal: cpu_cooling: merge frequency and power tables") Cc: stable@vger.kernel.org # v4.13+ Signed-off-by: Finley Xiao finley.xiao@rock-chips.com Acked-by: Viresh Kumar viresh.kumar@linaro.org Reviewed-by: Amit Kucheria amit.kucheria@linaro.org Signed-off-by: Daniel Lezcano daniel.lezcano@linaro.org Link: https://lore.kernel.org/r/20200619090825.32747-1-finley.xiao@rock-chips.com
diff --git a/drivers/thermal/cpufreq_cooling.c b/drivers/thermal/cpufreq_cooling.c index 9e124020519f..6c0e1b053126 100644 --- a/drivers/thermal/cpufreq_cooling.c +++ b/drivers/thermal/cpufreq_cooling.c @@ -123,12 +123,12 @@ static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_cdev, { int i;
- for (i = cpufreq_cdev->max_level - 1; i >= 0; i--) { - if (power > cpufreq_cdev->em->table[i].power) + for (i = cpufreq_cdev->max_level; i >= 0; i--) { + if (power >= cpufreq_cdev->em->table[i].power) break; }
- return cpufreq_cdev->em->table[i + 1].frequency; + return cpufreq_cdev->em->table[i].frequency; }
/**