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From: Pavel Machek <>
To: stuart hayes <>
Cc: Randy Dunlap <>,
	Bjorn Helgaas <>,, Keith Busch <>,,
	"" <>
Subject: Re: [PATCH v2] Add support for PCIe SSD status LED management
Date: Wed, 2 Jun 2021 11:05:04 +0200	[thread overview]
Message-ID: <20210602090504.GA10900@amd> (raw)
In-Reply-To: <>

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> >>>  [ok] [locate] failed rebuild pfa hotspare ica ifa invalid disabled
> >
> >So what does this do? Turns the LED on if driver is in "ok" or
> >"locate" states?
> >
> This would cause the system to somehow show the user that that this drive
> (or drive slot) is the one that it wants a person to be able to physically
> locate (possibly by flashing a blue LED on/near the drive), and also that
> the drive is OK.  It would presumably do that by lighting the LEDs on/near
> the drive with certain colors and/or flashing patterns, though it could, in
> theory, put "OK" in an LCD on the drive slot.  How the states are displayed
> to the user is beyond the scope of the specs.
> (The _DSM and NPEM specs provide for a way to control status LEDs on a drive
> or drive slot.  Typically drives will have 2 or 3 LEDs that are illuminated
> in different colors or flashing patterns to indicate various states (like
> those listed in IBPI / SFF-8489), though the _DSM / NPEM specs do not
> specify how the states are displayed.)

Well, LED subsystem expects to know how many LEDs are there and what
the LEDs are, and expects individual control over them.

"2 or 3 LEDs with unknown patterns", or LCD display is outside of scope
of LED subsystem, so this should be independend.

Best regards,

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  reply	other threads:[~2021-06-02  9:05 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-01 20:38 [PATCH v2] Add support for PCIe SSD status LED management Stuart Hayes
2021-06-01 21:20 ` Randy Dunlap
2021-06-01 22:38   ` Pavel Machek
2021-06-02  3:18     ` stuart hayes
2021-06-02  9:05       ` Pavel Machek [this message]
2021-06-02 15:36         ` stuart hayes
2021-06-02 22:40           ` Pavel Machek
2021-06-04 20:13             ` stuart hayes
2021-06-02 16:33       ` Marek Behún
2021-06-01 23:39   ` Randy Dunlap
2021-06-01 23:48 ` kernel test robot
2021-06-02  7:05 ` Lukas Wunner

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