From: "Albrecht Dreß" <albrecht.dress@arcor.de>
To: joakim.tjernlund@transmode.se
Cc: linuxppc-dev@ozlabs.org, devicetree-discuss@lists.ozlabs.org,
ben-linux@fluff.org, iws@ovro.caltech.edu
Subject: Re: [Patch v2 1/2] 5200/mpc: improve i2c bus error recovery
Date: Thu, 18 Feb 2010 10:09:23 +0100 (CET) [thread overview]
Message-ID: <33411516.1266484163759.JavaMail.ngmail@webmail09.arcor-online.net> (raw)
In-Reply-To: <OF3D88A7A0.9A4F1639-ONC12576CE.002C0FB9-C12576CE.002CCBBB@transmode.se>
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Hi Joakim:
> Does this reset sequence also send a START condition for every clock?
Please see the attached scan from a scope output, showing the first two out of the 9 sequences at 375 kHz (that's what the 5200's divider makes from 400 kHz requested). Resolution is 2us/div and 1V/div for both signals. The waveform itself for each of the 9 sequences is exactly the same we had before with the old solution, just the timing is faster and adjusted to the ii2c clock, i.e. the /relative/ waveforms look identical for slower clocks.
Any insight if this is *really* correct would be great, as I'm not an i2c expert. I can only say it reliably fixes the bus hangs I saw!
Thanks,
Albrecht.
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WARNING: multiple messages have this Message-ID (diff)
From: "Albrecht Dreß" <albrecht.dress-KvP5wT2u2U0@public.gmane.org>
To: joakim.tjernlund-SNLAxHN9vbcOP4wsBPIw7w@public.gmane.org
Cc: linuxppc-dev-mnsaURCQ41sdnm+yROfE0A@public.gmane.org,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
ben-linux-elnMNo+KYs3YtjvyW6yDsg@public.gmane.org,
iws-lulEs6mt1IksTUYHLfqkUA@public.gmane.org
Subject: Re: [Patch v2 1/2] 5200/mpc: improve i2c bus error recovery
Date: Thu, 18 Feb 2010 10:09:23 +0100 (CET) [thread overview]
Message-ID: <33411516.1266484163759.JavaMail.ngmail@webmail09.arcor-online.net> (raw)
In-Reply-To: <OF3D88A7A0.9A4F1639-ONC12576CE.002C0FB9-C12576CE.002CCBBB-SNLAxHN9vbcOP4wsBPIw7w@public.gmane.org>
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Hi Joakim:
> Does this reset sequence also send a START condition for every clock?
Please see the attached scan from a scope output, showing the first two out of the 9 sequences at 375 kHz (that's what the 5200's divider makes from 400 kHz requested). Resolution is 2us/div and 1V/div for both signals. The waveform itself for each of the 9 sequences is exactly the same we had before with the old solution, just the timing is faster and adjusted to the ii2c clock, i.e. the /relative/ waveforms look identical for slower clocks.
Any insight if this is *really* correct would be great, as I'm not an i2c expert. I can only say it reliably fixes the bus hangs I saw!
Thanks,
Albrecht.
Immer auf dem Laufenden! Sport, Auto, Reise, Politik und Promis. Von uns für Sie: der neue Arcor.de-Newsletter!
Jetzt anmelden und einfach alles wissen: http://www.arcor.de/rd/footer.newsletter
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next prev parent reply other threads:[~2010-02-18 9:09 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-17 18:59 [Patch v2 1/2] 5200/mpc: improve i2c bus error recovery Albrecht Dreß
2010-02-17 18:59 ` Albrecht Dreß
2010-02-17 20:10 ` Grant Likely
2010-02-17 20:10 ` Grant Likely
2010-02-18 8:09 ` Joakim Tjernlund
2010-02-18 8:09 ` Joakim Tjernlund
2010-02-18 9:09 ` Albrecht Dreß [this message]
2010-02-18 9:09 ` Albrecht Dreß
2010-02-18 12:33 ` Joakim Tjernlund
2010-02-18 12:33 ` Joakim Tjernlund
2010-02-18 13:23 ` Joakim Tjernlund
2010-02-18 13:23 ` Joakim Tjernlund
2010-05-05 22:09 ` Ira W. Snyder
2010-05-05 22:09 ` Ira W. Snyder
2010-05-06 17:54 ` Albrecht Dreß
2010-05-06 17:54 ` Albrecht Dreß
2010-05-06 18:06 ` Grant Likely
2010-05-06 18:06 ` Grant Likely
2010-05-16 17:47 ` Albrecht Dreß
2010-05-16 17:47 ` Albrecht Dreß
2010-05-19 16:02 ` Grant Likely
2010-05-19 16:02 ` Grant Likely
2010-06-16 19:30 ` Albrecht Dreß
2010-06-16 19:30 ` Albrecht Dreß
2013-03-13 5:30 ` panpan2523
-- strict thread matches above, loose matches on Subject: below --
2010-02-18 15:04 Albrecht Dreß
2010-02-18 15:04 ` Albrecht Dreß
2010-02-18 17:14 ` Joakim Tjernlund
2010-02-18 17:14 ` Joakim Tjernlund
2010-02-18 17:41 ` Grant Likely
2010-02-18 17:41 ` Grant Likely
2010-02-18 18:07 ` Joakim Tjernlund
2010-02-18 18:07 ` Joakim Tjernlund
2010-02-18 18:45 ` Albrecht Dreß
2010-02-18 18:45 ` Albrecht Dreß
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