[PATCH 34/42] ddr: imx9: Add workaround for DDRPHY rank-to-rank errata

sbabic at denx.de sbabic at denx.de
Sun May 21 19:09:07 CEST 2023

> From: Ye Li <ye.li at nxp.com>
> According to DDRPHY errata, the Rank-to-Rank Spacing and tphy_rdcsgap
> specification does not include the Critical Delay Difference (CDD) to
> properly define the required rank-to-rank read command spacing after
> executing PHY training firmware.
> Following the errata workaround, at the end of data training, we get
> all CDD values through the MessageBlock, then re-configure the DDRC
> timing of WWT/WRT/RRT/RWT with comparing MAX CDD values.
> Signed-off-by: Ye Li <ye.li at nxp.com>
> Acked-by: Peng Fan <peng.fan at nxp.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

DENX Software Engineering GmbH,        Managing Director: Erika Unter  
HRB 165235 Munich,   Office: Kirchenstr.5, 82194 Groebenzell, Germany
Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic at denx.de

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