linux-kernel - Re: [PATCH V1] mmc: core: Add partial initialization support

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Date:   Wed, 15 Jun 2022 15:48:03 -0700
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     "Sarthak Garg (QUIC)" <quic_sartgarg@...cinc.com>
Cc:     "Kamasali Satyanarayan (Consultant) (QUIC)" 
        <quic_kamasali@...cinc.com>,
        "avri.altman@....com" <avri.altman@....com>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "shawn.lin@...k-chips.com" <shawn.lin@...k-chips.com>,
        "merez@...eaurora.org" <merez@...eaurora.org>,
        "s.shtylyov@....ru" <s.shtylyov@....ru>,
        "huijin.park@...sung.com" <huijin.park@...sung.com>,
        "briannorris@...omium.org" <briannorris@...omium.org>,
        "digetx@...il.com" <digetx@...il.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Veerabhadrarao Badiganti <vbadigan@...eaurora.org>,
        Shaik Sajida Bhanu <sbhanu@...eaurora.org>,
        "quic_spathi@...cinc.com" <quic_spathi@...cinc.com>
Subject: Re: [PATCH V1] mmc: core: Add partial initialization support

On Tue, 24 May 2022 at 07:37, Sarthak Garg (QUIC)
<quic_sartgarg@...cinc.com> wrote:
>
> Hi Ulf,
>
> Please find the gains seen on micron and kingston eMMC parts below with partial initialization feature (These are the averaged numbers) :
>
> 1) Micron eMMC (ManfID 0x13)
>
> Partial init                            Full Init
>
> a) _mmc_resume:                         _mmc_resume :
>
> Total time : 62ms                       Total time : 84ms
> (Decrease % from full init = ~26%)

Alright, so we gained around 22ms. Not too bad.

>
> Breakup :
> mmc_claim_host_time: 0.2ms              mmc_claim_host_time: 0.1ms
> mmc_power_up_time: 33ms         mmc_power_up_time: 33ms
> mmc_sleepawake_time: 28ms               mmc_init_card_time: 50ms
> mmc_partial_init_time: 1ms
>
> b) _mmc_suspend:                        _mmc_suspend:
>
> Total time: 5ms                         Total time: 7.5ms
> mmc_claim_host_time: 0.5ms              mmc_claim_host_time: 1ms
> mmc_flush_cache_time : 1.5 ms   mmc_flush_cache_time : 2.5 ms
> mmc_sleep_time: 1.5ms           mmc_sleep_time: 2ms
> mmc_power_off_time: 1.5ms               mmc_power_off_time: 1.5ms

The suspend time shouldn't really differ. Or is there a reason for this?

>
>
> 2) Kingston eMMC (ManfID 0x70)
>
> Partial init                            Full Init
>
> a) _mmc_resume:                 _mmc_resume :
> Total time : 46ms                       Total time : 62ms
> (Decrease % from full init = ~25%)
>
> Breakup :
> mmc_claim_host_time: 0.2ms              mmc_claim_host_time: 0.2ms
> mmc_power_up_time: 30ms         mmc_power_up_time: 30ms
> mmc_sleepawake_time: 14ms               mmc_init_card_time: 31ms
> mmc_partial_init_time: 2ms
>
>
> b) _mmc_suspend:                        _mmc_suspend:
> Total time : 5ms                        Total: 5ms
>
> Breakup :
> mmc_claim_host_time: 0.5ms              mmc_claim_host_time: 0.5ms
> mmc_flush_cache_time : 1.5 ms   mmc_flush_cache_time : 1.5 ms
> mmc_sleep_time: 1.5ms           mmc_sleep_time: 1ms
> mmc_power_off_time: 1.5ms               mmc_power_off_time: 1.5ms
>
> Did some minor modifications as well to this patchset as per avri's comment which I'll post as V2.
> Please let me know your inputs about these numbers.

Thanks for posting these numbers, much appreciated! Please try to
include some of the data as part of the commit message as I think it's
valuable information.

When it comes to reviewing the code, I am awaiting your v2 then.

[...]

Kind regards
Uffe