On Fri, 16 Feb 2024 17:07:49 +0100
Mike Looijmans <mike.looijmans@xxxxxxxx> wrote:
> On 16-02-2024 16:53, Andy Shevchenko wrote:
>
> ...
>
> + if (reset_gpio) {
> + /*
> + * Deassert reset now that clock and power are active.
> + * Minimum reset pulsewidth is 2 clock cycles.
> + */
> + udelay(ADS1298_CLOCKS_TO_USECS(2));
>
> This is sleeping context and you are calling unsleeping function. I haven't
> checked the macro implementation and I have no idea what is the maximum it may
> give, but making code robust just use fsleep() call.
>
> It'll actually delay for 1 us (the "clock" is ~2MHz). So fsleep will compile to udelay anyway, which is fine, fsleep might get smarter in future and this would then profit.
>
>
>
> + gpiod_set_value_cansleep(reset_gpio, 0);
> + } else {
> + ret = ads1298_write_cmd(priv, ADS1298_CMD_RESET);
> + if (ret)
> + return dev_err_probe(dev, ret, "RESET failed\n");
> + }
> + /* Wait 18 clock cycles for reset command to complete */
> + udelay(ADS1298_CLOCKS_TO_USECS(18));
>
> Ditto.
>
> ...
>
>
> If it's the only issue I think Jonathan can modify when applying
> (no new patch version would be needed).
>
> That'd be nice.
ok. As this is still the top of my tree I'll just tweak it.
Does anyone else read fsleep as femtosecond sleep every time? :)
Maybe computers will go that fast one day.
Jonathan
>
>
> --
> Mike Looijmans
> System Expert
>
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