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@suse.de 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@redhat.com
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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)