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 <tr...@konsulko.com> wrote: > > > > On Mon, Nov 29, 2021 at 05:34:49PM +0530, Sinthu Raja wrote: > > > > > From: Sinthu Raja <sinthu.r...@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 <double...@ti.com> > > > Signed-off-by: Sinthu Raja <sinthu.r...@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
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