linux-kernel - Re: [PATCH] PM / QoS: Fix default runtime

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Message-ID: <CAJZ5v0gLw2J=zU3fJxSnea_ua2AgP8bRoFQLi7_wyAzLJGizEg@mail.gmail.com>
Date:   Wed, 1 Nov 2017 23:36:21 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Tero Kristo <t-kristo@...com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        DRI Development <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] PM / QoS: Fix default runtime_pm device resume latency

[cut]

>> It seems the default values for pm_qos have changed with the patch, and that
>> breaks genpd at least. I only fixed PM runtime initially, but you could try
>> this diff to fix the genpd part also:
>>
>> diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
>> index d68b056..7c8f643 100644
>> --- a/include/linux/pm_qos.h
>> +++ b/include/linux/pm_qos.h
>> @@ -34,9 +34,9 @@ enum pm_qos_flags_status {
>>  #define PM_QOS_NETWORK_LAT_DEFAULT_VALUE       (2000 * USEC_PER_SEC)
>>  #define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE        0
>>  #define PM_QOS_MEMORY_BANDWIDTH_DEFAULT_VALUE  0
>> -#define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE    0
>> +#define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE    PM_QOS_LATENCY_ANY
>>  #define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT    PM_QOS_LATENCY_ANY
>> -#define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0
>> +#define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE (-1)
>>  #define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1)
>>
>>  #define PM_QOS_FLAG_NO_POWER_OFF       (1 << 0)
>
> This is the original change in pm_qos.h (up to the GMail-induced
> whitespace breakage):
>
> -#define PM_QOS_DEFAULT_VALUE -1
> +#define PM_QOS_DEFAULT_VALUE (-1)
> +#define PM_QOS_LATENCY_ANY S32_MAX
>
> #define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
> #define PM_QOS_NETWORK_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
> #define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
> #define PM_QOS_MEMORY_BANDWIDTH_DEFAULT_VALUE 0
> #define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE 0
> +#define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT PM_QOS_LATENCY_ANY

OK, so I should have changed PM_QOS_RESUME_LATENCY_DEFAULT_VALUE to
PM_QOS_LATENCY_ANY too, so that the default is still "no restriction".

> #define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0
> #define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1)
>
> -#define PM_QOS_LATENCY_ANY ((s32)(~(__u32)0 >> 1))
>
> #define PM_QOS_FLAG_NO_POWER_OFF (1 << 0)
> #define PM_QOS_FLAG_REMOTE_WAKEUP (1 << 1)

Thanks,
Rafael