[U-Boot] mmc: omap_hsmmc: Workaround errata regarding SDR104/HS200 tuning failures (i929)

[Tom Rini]

On Wed, Jan 30, 2019 at 06:08:42PM +0530, Faiz Abbas wrote:

> Errata i929 in certain OMAP5/DRA7XX/AM57XX silicon revisions
> (SPRZ426D - November 2014 - Revised February 2018 [1]) mentions
> unexpected tuning pattern errors. A small failure band may be present
> in the tuning range which may be missed by the current algorithm.
> Furthermore, the failure bands vary with temperature leading to
> different optimum tuning values for different temperatures.
> 
> As suggested in the related Application Report (SPRACA9B - October 2017
> - Revised July 2018 [2]), tuning should be done in two stages.
> In stage 1, assign the optimum ratio in the maximum pass window for the
> current temperature. In stage 2, if the chosen value is close to the
> small failure band, move away from it in the appropriate direction.
> 
> References:
> [1] http://www.ti.com/lit/pdf/sprz426
> [2] http://www.ti.com/lit/pdf/SPRACA9
> 
> Signed-off-by: Faiz Abbas <faiz_abbas at ti.com>

Applied to u-boot/master, thanks!

-- 
Tom
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: not available
URL: <http://lists.denx.de/pipermail/u-boot/attachments/20190210/5fd0658b/attachment.sig>