[PATCH linux dev-4.10 6/7] drivers/fsi: GPIO stability changes for Cronus/Hostboot
joel at jms.id.au
Thu May 11 22:07:43 AEST 2017
On Wed, May 10, 2017 at 7:09 AM, Christopher Bostic
<cbostic at 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 at 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.
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