Hi Thomas and Jocelyn,
What we do in ast_dp_set_on_off() is a handshake between host driver and bmc-fw to confirm
the operation, on/off, is completed.
We use some scratch registers in bmc to handshake with host. This handshake only work if
BMC's scu-lock is opened. If scu-lock is opened too late, then it could lead to this issue.
Best regards
Jammy
Thomas Zimmermann <tzimmermann@xxxxxxx> 於 2024年3月28日 週四 上午4:28寫道：
Hi
Am 27.03.24 um 09:53 schrieb Jocelyn Falempe:
> Hi,
>
> Thanks for your patch.
> I'm wondering how you can trigger this infinite loop ?
Yeah, a bit more context for this bug would be welcome. It's hard to
judge the fix without.
Best regards
Thomas
>
> Also this looks like a simple fix, that can be easily backported, so
> I'm adding stable in Cc.
>
> If Thomas has no objections, I can push it to drm-misc-fixes.
>
> Reviewed-by: Jocelyn Falempe <jfalempe@xxxxxxxxxx>
>
--
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)
