diff options
| author | Patrick Delaunay <patrick.delaunay@foss.st.com> | 2021-11-15 17:32:28 +0300 |
|---|---|---|
| committer | Patrice Chotard <patrice.chotard@foss.st.com> | 2021-11-30 18:43:28 +0300 |
| commit | 4831ba2903d886d233400423c2a425fde170b367 (patch) | |
| tree | feec12ab6fd2e8c2d7c2997e55223fbef9363503 /drivers/ram | |
| parent | 77d043cac66965d48381cfec8f227799202a0a30 (diff) | |
| download | u-boot-4831ba2903d886d233400423c2a425fde170b367.tar.xz | |
stm32mp1: ram: add read valid training support
Add the read data eye training = training for optimal read valid placement
(RVTRN) when the built-in calibration is executed for LPDDR2 and LPDDR3.
This training is supported on the PUBL integrated in the STM32MP15x
DDR subsystem and it is not required for DDR3.
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Diffstat (limited to 'drivers/ram')
| -rw-r--r-- | drivers/ram/stm32mp1/stm32mp1_ddr.c | 8 | ||||
| -rw-r--r-- | drivers/ram/stm32mp1/stm32mp1_ddr_regs.h | 1 |
2 files changed, 7 insertions, 2 deletions
diff --git a/drivers/ram/stm32mp1/stm32mp1_ddr.c b/drivers/ram/stm32mp1/stm32mp1_ddr.c index 0457166b12..1f8422518b 100644 --- a/drivers/ram/stm32mp1/stm32mp1_ddr.c +++ b/drivers/ram/stm32mp1/stm32mp1_ddr.c @@ -826,8 +826,12 @@ start: */ /* 10. configure PUBL PIR register to specify which training step to run */ - /* warning : RVTRN is not supported by this PUBL */ - stm32mp1_ddrphy_init(priv->phy, DDRPHYC_PIR_QSTRN); + /* RVTRN is excuted only on LPDDR2/LPDDR3 */ + if (config->c_reg.mstr & DDRCTRL_MSTR_DDR3) + pir = DDRPHYC_PIR_QSTRN; + else + pir = DDRPHYC_PIR_QSTRN | DDRPHYC_PIR_RVTRN; + stm32mp1_ddrphy_init(priv->phy, pir); /* 11. monitor PUB PGSR.IDONE to poll cpmpletion of training sequence */ ddrphy_idone_wait(priv->phy); diff --git a/drivers/ram/stm32mp1/stm32mp1_ddr_regs.h b/drivers/ram/stm32mp1/stm32mp1_ddr_regs.h index 3c8885a965..ada3087328 100644 --- a/drivers/ram/stm32mp1/stm32mp1_ddr_regs.h +++ b/drivers/ram/stm32mp1/stm32mp1_ddr_regs.h @@ -309,6 +309,7 @@ struct stm32mp1_ddrphy { #define DDRPHYC_PIR_DRAMRST BIT(5) #define DDRPHYC_PIR_DRAMINIT BIT(6) #define DDRPHYC_PIR_QSTRN BIT(7) +#define DDRPHYC_PIR_RVTRN BIT(8) #define DDRPHYC_PIR_ICPC BIT(16) #define DDRPHYC_PIR_ZCALBYP BIT(30) #define DDRPHYC_PIR_INITSTEPS_MASK GENMASK(31, 7) |