From: Joel Stanley <joel@jms.id.au>
To: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Cc: OpenBMC Maillist <openbmc@lists.ozlabs.org>
Subject: Re: [PATCH linux dev-4.10 6/7] drivers/fsi: GPIO stability changes for Cronus/Hostboot
Date: Thu, 11 May 2017 21:37:43 +0930 [thread overview]
Message-ID: <CACPK8XcTJ+rRTjU1oHtQ8WPHc3SvHsMqZevjjdihc82saps4cA@mail.gmail.com> (raw)
In-Reply-To: <20170509213902.37939-7-cbostic@linux.vnet.ibm.com>
On Wed, May 10, 2017 at 7:09 AM, Christopher Bostic
<cbostic@linux.vnet.ibm.com> wrote:
> Improve stability in the FSI protocol by re-ordering the clocking
> delays. Increase clocking delays to 3 microseconds. Remove
> delay prior to sampling input - now redundant given new clocking
> delay order.
>
> New effective delay per clock toggle is now 6 microseconds.
> Previous clocking summed up to 3 nS but real time measurements
> of each 1 nS delay actually was approx 1.8 microseconds.
> Previous total delay was then 1.8 * 3 = 5.4 microseconds.
>
> Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Applied to dev-4.10 with a note about this being a temporary fix until
we find the root cause.
Keep us updated with the investigation.
Cheers,
Joel
next prev parent reply other threads:[~2017-05-11 12:08 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-09 21:38 [PATCH linux dev-4.10 0/7] OpenFSI Updates for dev-4.10 kernel Christopher Bostic
2017-05-09 21:38 ` [PATCH linux dev-4.10 1/7] drivers/fsi: Add slave interrupt polling Christopher Bostic
2017-05-10 22:26 ` Eddie James
2017-05-09 21:38 ` [PATCH linux dev-4.10 2/7] drivers/fsi: Add Client IRQ Enable / Disable Christopher Bostic
2017-05-09 21:38 ` [PATCH linux dev-4.10 3/7] drivers/fsi: Scan for hub sourced IRQ's Christopher Bostic
2017-05-09 21:38 ` [PATCH linux dev-4.10 4/7] drivers/fsi: Set IRQ masks along hub path Christopher Bostic
2017-05-09 21:39 ` [PATCH linux dev-4.10 5/7] drivers/fsi: Unscan on master unregister Christopher Bostic
2017-05-11 12:06 ` Joel Stanley
2017-05-09 21:39 ` [PATCH linux dev-4.10 6/7] drivers/fsi: GPIO stability changes for Cronus/Hostboot Christopher Bostic
2017-05-11 12:07 ` Joel Stanley [this message]
2017-05-09 21:39 ` [PATCH linux dev-4.10 7/7] drivers/fsi: Fix one and two byte bus reads/writes Christopher Bostic
2017-05-11 12:06 ` Joel Stanley
2017-05-10 2:25 ` [PATCH linux dev-4.10 0/7] OpenFSI Updates for dev-4.10 kernel Jeremy Kerr
2017-05-10 15:46 ` Christopher Bostic
2017-05-11 12:09 ` Joel Stanley
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