Messages in this thread | | | From | Linus Walleij <> | Date | Tue, 11 Apr 2017 10:17:58 +0200 | Subject | Re: [PATCH v2] mmc: core: add mmc-card hardware reset enable support |
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On Tue, Apr 11, 2017 at 9:31 AM, Richard Leitner <richard.leitner@skidata.com> wrote:
> Some eMMCs disable their hardware reset line (RST_N) by default. To enable > it the host must set the corresponding bit in ECSD. An example for such > a device is the Micron MTFCxGACAANA-4M. > > This patch adds a new mmc-card devicetree property to let the host enable > this feature during card initialization. > > Signed-off-by: Richard Leitner <richard.leitner@skidata.com>
Do we know *WHY* these cards disable their hardware reset lines?
If it is just some random over-cautious panic thing we might consider just force re-enableing it, maybe with a warning in the dmesg, so we can always reset the card. No DT property needed.
Putting some people who work for eMMC vendors in the To: line so they can say if they know about this.
Yours, Linus Walleij
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