linux-kernel - Re: [PATCH 4/4] ARM: dts: Fix-up EMMC2 controller's frequency

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Message-ID: <a046159f5feb2ad777a35f109a19edeb294c7027.camel@suse.de>
Date:   Fri, 09 Apr 2021 11:28:48 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Alan Cooper <alcooperx@...il.com>
Cc:     Stefan Wahren <stefan.wahren@...e.com>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        "moderated list:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        linux-rpi-kernel@...ts.infradead.org,
        Florian Fainelli <f.fainelli@...il.com>, phil@...pberrypi.com,
        Tim Gover <tim.gover@...pberrypi.com>,
        Scott Branden <sbranden@...adcom.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        ": Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH 4/4] ARM: dts: Fix-up EMMC2 controller's frequency

Hi Al,

On Wed, 2021-04-07 at 16:37 -0400, Alan Cooper wrote:
> Nicolas,
> 
> I got a better description of the failure and it looks like the bus
> clock needs to be limited to 300KHz for a 500MHz core clock.
> What's happening is that an internal reset sequence is needed after a
> command timeout and the reset signal needs to be asserted for at least
> 2 ticks of the bus clock. This is done using a 12 bit counter clocked
> by the core clock. That means a 500MHz core clock produces a 122KHz
> reset signal which is too fast for 2 ticks of the 200KHz bus clock
> (100KHz) but is okay for the 300KHz (150Khz) bus clock.

Thanks for the info. I'll work something out.

Regards,
Nicolas


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