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. > > -- > Tom
-- With Regards Sinthu Raja
