netdev - Re: [PATCH lora-next 3/5] net: lora: sx130x: Add PicoCell serdev driver

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Date:   Sat, 5 Jan 2019 02:49:46 +0100
From:   Andreas Färber <afaerber@...e.de>
To:     linux-lpwan@...ts.infradead.org,
        Ben Whitten <ben.whitten@...il.com>
Cc:     linux-serial@...r.kernel.org, Rob Herring <robh@...nel.org>,
        devicetree@...r.kernel.org, netdev@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH lora-next 3/5] net: lora: sx130x: Add PicoCell serdev
 driver

Am 04.01.19 um 12:21 schrieb Andreas Färber:
> Currently there's still some bugs to be investigated, with communication
> stalling on one device and another reading the radio versions wrong
> (07 / 1f instead of 21, also observed on spi once).

Reproducable 100% on SPI by setting REGCACHE_RBTREE in sx130x.c.

Since this serdev driver was using REGCACHE_NONE still and I don't spot
a register missing as volatile either, I guess it may be a timing issue?

My earlier locking patch is applied, to rule out any non-determinism in
the register access order due to radio vs. concentrator interactions.

Regards,
Andreas

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