diff mbox series

thermal/drivers/cpufreq_cooling: Fix wrong frequency converted from power

Message ID 20200619090825.32747-1-finley.xiao@rock-chips.com (mailing list archive)
State New, archived
Headers show
Series thermal/drivers/cpufreq_cooling: Fix wrong frequency converted from power | expand

Commit Message

Finley Xiao June 19, 2020, 9:08 a.m. UTC
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>
---
 drivers/thermal/cpufreq_cooling.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Comments

Amit Kucheria June 23, 2020, 7 a.m. UTC | #1
Hi Finley,

Please use versioning (v2) when resending a patch.

On Fri, Jun 19, 2020 at 2:39 PM Finley Xiao <finley.xiao@rock-chips.com> wrote:
>
> 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>

> ---
>  drivers/thermal/cpufreq_cooling.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> 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;
>  }
>
>  /**
> --
> 2.11.0
>
>
>
diff mbox series

Patch

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;
 }
 
 /**