j78s4/j721e/j7200/J721s2 can't use the standard resume sequence. Typical DDR resume sequence is: - exit DDR from retention - de-assert the DDR_RET pin - restore DDR max frequency - exit DDR from low power
We have to separate each action in order to de-assert the DDR_RET pins at the right time, because the DDR_RET pins are all tied together in hardware. At resume, only the initialization of the DDR is done by the driver, the rest is handled in boart_init_f(). So, introduce lpm_init_only flag to only initialize the DDR when resume is detected for those boards. Signed-off-by: Richard Genoud (TI) <[email protected]> --- drivers/ram/k3-ddrss/k3-ddrss.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/ram/k3-ddrss/k3-ddrss.c b/drivers/ram/k3-ddrss/k3-ddrss.c index 7b23123ab00d..5db421353e1f 100644 --- a/drivers/ram/k3-ddrss/k3-ddrss.c +++ b/drivers/ram/k3-ddrss/k3-ddrss.c @@ -122,6 +122,7 @@ enum intrlv_size { struct k3_ddrss_data { u32 flags; + bool lpm_init_only; bool (*is_lpm_resume)(void); void (*ddrss_deassert_retention)(void); }; @@ -1157,6 +1158,9 @@ static int k3_ddrss_probe(struct udevice *dev) k3_lpddr4_init(ddrss); k3_lpddr4_hardware_reg_init(ddrss); + if (is_lpm_resume && ddrss_data->lpm_init_only) + return k3_ddrss_init_freq(ddrss); + if (is_lpm_resume) k3_ddrss_self_refresh_exit(ddrss->ddrss_ctl_cfg); @@ -1294,6 +1298,8 @@ static struct ram_ops k3_ddrss_ops = { static const struct k3_ddrss_data k3_data = { .flags = SINGLE_DDR_SUBSYSTEM, + .lpm_init_only = true, + .is_lpm_resume = j7xx_board_is_resuming, }; static const struct k3_ddrss_data am62xx_data = { @@ -1304,6 +1310,8 @@ static const struct k3_ddrss_data am62xx_data = { static const struct k3_ddrss_data j721s2_data = { .flags = MULTI_DDR_SUBSYSTEM, + .lpm_init_only = true, + .is_lpm_resume = j7xx_board_is_resuming, }; static const struct k3_ddrss_data j722s_data = { -- 2.47.3
