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ram: stm32mp1: Unconditionally enable ASR

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Enable DRAM ASR, auto self-refresh, unconditionally. This saves non-trivial
amount of power both at runtime and in suspend (on 2x W632GU6NB-15 ~150mW).

Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
Cc: Patrice Chotard <patrice.chotard@foss.st.com>
This commit is contained in:
Marek Vasut 2022-02-25 02:15:58 +01:00 committed by Patrice Chotard
parent 9a8996df05
commit 0d44ad8bb4
2 changed files with 31 additions and 0 deletions
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25
drivers/ram/stm32mp1/stm32mp1_ddr.c
View file

@ -27,6 +27,8 @@
#define RCC_DDRITFCR_DPHYAPBRST (BIT(17))
#define RCC_DDRITFCR_DPHYRST (BIT(18))
#define RCC_DDRITFCR_DPHYCTLRST (BIT(19))
#define RCC_DDRITFCR_DDRCKMOD_MASK GENMASK(22, 20)
#define RCC_DDRITFCR_DDRCKMOD_ASR BIT(20)
struct reg_desc {
const char *name;
@ -651,6 +653,26 @@ static void stm32mp1_refresh_restore(struct stm32mp1_ddrctl *ctl,
wait_sw_done_ack(ctl);
}
static void stm32mp1_asr_enable(struct ddr_info *priv)
{
struct stm32mp1_ddrctl *ctl = priv->ctl;
clrsetbits_le32(priv->rcc + RCC_DDRITFCR, RCC_DDRITFCR_DDRCKMOD_MASK,
RCC_DDRITFCR_DDRCKMOD_ASR);
start_sw_done(ctl);
setbits_le32(&ctl->hwlpctl, DDRCTRL_HWLPCTL_HW_LP_EN);
writel(DDRCTRL_PWRTMG_POWERDOWN_TO_X32(0x10) |
DDRCTRL_PWRTMG_SELFREF_TO_X32(0x01),
&ctl->pwrtmg);
setbits_le32(&ctl->pwrctl, DDRCTRL_PWRCTL_EN_DFI_DRAM_CLK_DISABLE);
setbits_le32(&ctl->pwrctl, DDRCTRL_PWRCTL_SELFREF_EN);
setbits_le32(&ctl->dfimisc, DDRCTRL_DFIMISC_DFI_INIT_COMPLETE_EN);
wait_sw_done_ack(ctl);
}
/* board-specific DDR power initializations. */
__weak int board_ddr_power_init(enum ddr_type ddr_type)
{
@ -822,6 +844,9 @@ start:
stm32mp1_refresh_restore(priv->ctl, config->c_reg.rfshctl3,
config->c_reg.pwrctl);
/* Enable auto-self-refresh, which saves a bit of power at runtime. */
stm32mp1_asr_enable(priv);
/* enable uMCTL2 AXI port 0 and 1 */
setbits_le32(&priv->ctl->pctrl_0, DDRCTRL_PCTRL_N_PORT_EN);
setbits_le32(&priv->ctl->pctrl_1, DDRCTRL_PCTRL_N_PORT_EN);

6
drivers/ram/stm32mp1/stm32mp1_ddr_regs.h
View file

@ -265,8 +265,14 @@ struct stm32mp1_ddrphy {
#define DDRCTRL_PWRCTL_SELFREF_EN BIT(0)
#define DDRCTRL_PWRCTL_POWERDOWN_EN BIT(1)
#define DDRCTRL_PWRCTL_EN_DFI_DRAM_CLK_DISABLE BIT(3)
#define DDRCTRL_PWRCTL_SELFREF_SW BIT(5)
#define DDRCTRL_PWRTMG_SELFREF_TO_X32(n) (((n) & 0xff) << 16)
#define DDRCTRL_PWRTMG_POWERDOWN_TO_X32(n) ((n) & 0x1f)
#define DDRCTRL_HWLPCTL_HW_LP_EN BIT(0)
#define DDRCTRL_RFSHCTL3_DIS_AUTO_REFRESH BIT(0)
#define DDRCTRL_RFSHTMG_T_RFC_NOM_X1_X32_MASK GENMASK(27, 16)