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

[Tom Rini]

On Wed, Feb 09, 2022 at 01:35:58PM +0530, Sinthu Raja M wrote:
> 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.

OK, thanks.

-- 
Tom
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 659 bytes
Desc: not available
URL: <https://lists.denx.de/pipermail/u-boot/attachments/20220209/a6b3668d/attachment.sig>