Re: [PATCH v3 14/42] power: reset: Add a driver for the ep93xx reset

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Andy,

On Fri, 2023-07-21 at 19:37 +0300, Andy Shevchenko wrote:
> > +       /* Issue the reboot */
> > +       ep93xx_devcfg_set_clear(priv->map, EP93XX_SYSCON_DEVCFG_SWRST, 0x00);
> > +       ep93xx_devcfg_set_clear(priv->map, 0x00, EP93XX_SYSCON_DEVCFG_SWRST);
> 
> 
> > +       mdelay(1000);
> 
> Atomic?! Such a huge delay must be explained, esp. why it's atomic.

atomic or not, SoC is supposed to reset itself here.
However there is an errata [1] and the SoC can lockup instead.
So even pr_emerg() makes sense to me.

> > +       pr_emerg("Unable to restart system\n");
> > +       return NOTIFY_DONE;

[1] http://web.archive.org/web/20161130230727/http://www.cirrus.com/en/pubs/appNote/AN258REV2.pdf

-- 
Alexander Sverdlin.





[Index of Archives]     [Linux Kernel]     [Linux ARM (vger)]     [Linux ARM MSM]     [Linux Omap]     [Linux Arm]     [Linux Tegra]     [Fedora ARM]     [Linux for Samsung SOC]     [eCos]     [Linux Fastboot]     [Gcc Help]     [Git]     [DCCP]     [IETF Announce]     [Security]     [Linux MIPS]     [Yosemite Campsites]

  Powered by Linux