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Date:   Mon, 13 Mar 2023 22:42:08 +0100
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Subject: Re: [RFC PATCH] brcmfmac: add 43751 SDIO ids and initialization
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To:     Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc:     Ulf Hansson <ulf.hansson@linaro.org>,
        Neil Armstrong <neil.armstrong@linaro.org>,
        Arend van Spriel <aspriel@gmail.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Kalle Valo <kvalo@kernel.org>,
        Eric Dumazet <edumazet@google.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>,
        Alexander Prutskov <alep@cypress.com>,
        Joseph chuang <jiac@cypress.com>,
        Kevin Hilman <khilman@baylibre.com>,
        Jerome Brunet <jbrunet@baylibre.com>,
        Angus Ainslie <angus@akkea.ca>,
        Pierre-Hugues Husson <phh@phh.me>,
        linux-wireless@vger.kernel.org, linux-mmc@vger.kernel.org,
        linux-amlogic@lists.infradead.org
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From:   Marc Gonzalez <marc.w.gonzalez@free.fr>
In-Reply-To: <CAFBinCDHRhLSyFsEv7cdhSgZorj-TdR3HhqSBnAQcUtEsecV=Q@mail.gmail.com>
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On 13/03/2023 21:04, Martin Blumenstingl wrote:

> On Mon, Mar 13, 2023 at 6:09 PM Marc Gonzalez wrote:
> [...]
>> QUESTION:
>> It's not clear to me why we sleep twice for host->ios.power_delay_ms?
>
> I'm not sure but I think host->ios.power_delay_ms is independent from
> the post-power-on-delay-ms property of "mmc-pwrseq-simple".

They are distinct indeed (the props have the same name & similar purpose though).

host->ios.power_delay_ms is set via:

drivers/mmc/core/host.c:        device_property_read_u32(dev, "post-power-on-delay-ms",
drivers/mmc/core/host.c-                                 &host->ios.power_delay_ms);


pwrseq->post_power_on_delay_ms is set via:

drivers/mmc/core/pwrseq_simple.c:       device_property_read_u32(dev, "post-power-on-delay-ms",
drivers/mmc/core/pwrseq_simple.c-                                &pwrseq->post_power_on_delay_ms);


However, they are both used to delay mmc_power_up(),
and the host delay is used to sleep twice, which I
found confusing ;)

Regards