[PATCH] arm: mvebu: update RTC values for PCIe memory wrappers

[Chris Packham]

On Wed, 2020-02-26 at 19:46 +1300, Chris Packham wrote:
> Hi Baruch,
> 
> On Wed, 2020-02-26 at 06:49 +0200, Baruch Siach wrote:
> > Hi Chris,
> > 
> > On Wed, Feb 26 2020, Chris Packham wrote:
> > > From: Chris Packham <chris.packham at alliedtelesis.co.nz>
> > > 
> > > Update the RTC (Read Timing Control) values for PCIe memory
> > > wrappers
> > > following an ERRATA (ERRATA# TDB). This means the PCIe accesses
> > > will
> > > used slower memory Read Timing, to allow more efficient energy
> > > consumption, in order to lower the minimum VDD of the
> > > memory.  Will
> > > lead
> > > to more robust memory when voltage drop occurs (VDDSEG)
> > 
> > Have you seen memory access reliability problems because of this
> > issue?
> > 
> 
> We're seeing a few different symptoms but they all consist of a PCIe
> transfer failing in some way (as far as we can tell in the TX
> direction
> from the CPU).
> 
> > > The code is based on changes from Marvell's U-Boot, specifically:
> > > 
> > > 
> 
> 
https://github.com/MarvellEmbeddedProcessors/u-boot-marvell/commit/20cd2704072512de176e048970f2883db901674b
> > > 
> 
> 
https://github.com/MarvellEmbeddedProcessors/u-boot-marvell/commit/eb608a7c8dd0d42b87601a61b9c0cc5615ab94b2
> > > 
> 
> 
https://github.com/MarvellEmbeddedProcessors/u-boot-marvell/commit/c4af19ae2bf08cf6e450e741ce4f04d402a5cb6b
> > > 
> 
> 
https://github.com/MarvellEmbeddedProcessors/u-boot-marvell/commit/c4af19ae2bf08cf6e450e741ce4f04d402a5cb6b
> > 
> > The last link looks duplicated.
> 
> Hmm I was pretty sure there were 4 commits. I'll double check and
> either fix or remove the link.

Ah. There are 4 patches, but the last one isn't in the github repo for
some reason. I'll drop the link.

> 
> > 
> > baruch
> >