On Wed, Jul 08, 2020 at 01:23:43PM +0530, Viresh Kumar wrote:
> From: Finley Xiao <finley.xiao@xxxxxxxxxxxxxx>
>
> commit 371a3bc79c11b707d7a1b7a2c938dc3cc042fffb upstream.
>
> 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@xxxxxxxxxxxxxxx> # v4.13+
> Signed-off-by: Finley Xiao <finley.xiao@xxxxxxxxxxxxxx>
> Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
> Reviewed-by: Amit Kucheria <amit.kucheria@xxxxxxxxxx>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
> Link: https://lore.kernel.org/r/20200619090825.32747-1-finley.xiao@xxxxxxxxxxxxxx
> Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
> ---
> Hi Greg,
>
> I am resending this as I got your emails of this failing on 4.14, 4.19
> and 5.4. This should be applied to all three of them.
>
> @Finley: I hope I have done it correctly, please do check it as this
> required me to rewrite the code to adapt to previous kernels.
>
> drivers/thermal/cpu_cooling.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
> index 908a8014cf76..1f4387a5ceae 100644
> --- a/drivers/thermal/cpu_cooling.c
> +++ b/drivers/thermal/cpu_cooling.c
> @@ -280,11 +280,11 @@ static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_cdev,
> int i;
> struct freq_table *freq_table = cpufreq_cdev->freq_table;
>
> - for (i = 1; i <= cpufreq_cdev->max_level; i++)
> - if (power > freq_table[i].power)
> + for (i = 0; i < cpufreq_cdev->max_level; i++)
> + if (power >= freq_table[i].power)
> break;
>
> - return freq_table[i - 1].frequency;
> + return freq_table[i].frequency;
> }
>
> /**
> --
> 2.25.0.rc1.19.g042ed3e048af
>
Now queued up, thanks.
greg k-h
