[PATCH] arm:dts:k3-am64-sk: EMIF tool update to 0.8.0 with 1333MTs for lpddr4

[Sinthu Raja M]

On Sat, Jan 15, 2022 at 9:04 PM Tom Rini <trini at konsulko.com> wrote:
>
> On Mon, Nov 29, 2021 at 05:34:49PM +0530, Sinthu Raja wrote:
>
> > From: Sinthu Raja <sinthu.raja at ti.com>
> >
> > EMIF tool for AM64 SK is now updated to 0.8.0 that includes
> > * disabled Write DQ training
> > * improve CA ODT to 60 ohms
> >
> > The lpddr4 enabled with periodic WDQ training is causing periodic 26us
> > stall. This makes the SoC stall without doing anything which leads to
> > R5 interrupt latency in TCM memory. Due to this periodic training there
> > are some outstanding CPU transactions waiting for the lpddr4 to complete.
> >
> > Hence, disable the periodic write DQ training during the
> > non-initialization stage of lpddr4 which results in an approximate 1us
> > stall. Also, update the lpddr4 config to improve CA ODT by 60 ohms
> >
> > The rationales are as follows:
> > - PI_WDQLVL_EN: 2 Bits register field to support write DQ leveling,
> >   disable bit 1 that supports Write DQ during non-initialization to
> >   avoid ~26us stall during code execution.
> >
> > - MR11_DATA_F1/F2_x register fields value changed to 0x66 that changes
> >   the CA ODT from 48ohm to 60ohm to improve the eye margin on CA bus by
> >   increasing the signal swing.
> >
> > Signed-off-by: James Doublesin <doublesin at ti.com>
> > Signed-off-by: Sinthu Raja <sinthu.raja at ti.com>
> > ---
> >  arch/arm/dts/k3-am64-sk-lp4-1333MTs.dtsi | 28 ++++++++++++------------
>
> Have all of these updates been pushed to Linux?  Thanks!
Tom,
These changes are specific to u-boot. And it not requires any change in Linux.
>
> --
> Tom




-- 
With Regards
Sinthu Raja