All of lore.kernel.org
 help / color / mirror / Atom feed
* FAILED: patch "[PATCH] thermal/drivers/cpufreq_cooling: Fix wrong frequency" failed to apply to 5.4-stable tree
@ 2020-07-07 13:36 gregkh
  0 siblings, 0 replies; only message in thread
From: gregkh @ 2020-07-07 13:36 UTC (permalink / raw)
  To: finley.xiao, amit.kucheria, daniel.lezcano, stable, viresh.kumar; +Cc: stable


The patch below does not apply to the 5.4-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;
 }
 
 /**


^ permalink raw reply related	[flat|nested] only message in thread

only message in thread, other threads:[~2020-07-07 13:36 UTC | newest]

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-07 13:36 FAILED: patch "[PATCH] thermal/drivers/cpufreq_cooling: Fix wrong frequency" failed to apply to 5.4-stable tree gregkh

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.