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rcar_gen3: drivers: pwrc: Add DBSC4 setting before self-refresh mode 

Very rarely, LPDDR4 power consumption may not decrease
In self-refresh mode.

This patch fixes the DBSC4 self-refresh mode sequence.

Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com>
Signed-off-by: Kenji Miyazawa <kenji.miyazawa.xt@renesas.com>
Signed-off-by: Chiaki Fujii <chiaki.fujii.wj@renesas.com>
Change-Id: I838fa0892b1caf1ecd3f04538b3427e7d971ef59
This commit is contained in:
Yoshifumi Hosoya 2019-03-15 23:19:28 +09:00 committed by Marek Vasut
parent 285b6cfe3b
commit 4983f8b63c
1 changed files with 7 additions and 0 deletions
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7
drivers/renesas/rcar/pwrc/pwrc.c
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@ -50,6 +50,7 @@ RCAR_INSTANTIATE_LOCK
#define DBSC4_REG_DBRFEN (DBSC4_REG_BASE + 0x0204U)
#define DBSC4_REG_DBWAIT (DBSC4_REG_BASE + 0x0210U)
#define DBSC4_REG_DBCALCNF (DBSC4_REG_BASE + 0x0424U)
#define DBSC4_REG_DBDFIPMSTRCNF (DBSC4_REG_BASE + 0x0520U)
#define DBSC4_REG_DBPDLK0 (DBSC4_REG_BASE + 0x0620U)
#define DBSC4_REG_DBPDRGA0 (DBSC4_REG_BASE + 0x0624U)
#define DBSC4_REG_DBPDRGD0 (DBSC4_REG_BASE + 0x0628U)
@ -61,6 +62,7 @@ RCAR_INSTANTIATE_LOCK
#define DBSC4_BIT_DBACEN_ACCEN ((uint32_t)(1U << 0))
#define DBSC4_BIT_DBRFEN_ARFEN ((uint32_t)(1U << 0))
#define DBSC4_BIT_DBCAMxSTAT0 (0x00000001U)
#define DBSC4_BIT_DBDFIPMSTRCNF_PMSTREN (0x00000001U)
#define DBSC4_SET_DBCMD_OPC_PRE (0x04000000U)
#define DBSC4_SET_DBCMD_OPC_SR (0x0A000000U)
#define DBSC4_SET_DBCMD_OPC_PD (0x08000000U)
@ -393,6 +395,11 @@ static void __attribute__ ((section(".system_ram")))
self_refresh:
/* DFI_PHYMSTR_ACK setting */
mmio_write_32(DBSC4_REG_DBDFIPMSTRCNF,
mmio_read_32(DBSC4_REG_DBDFIPMSTRCNF) &
(~DBSC4_BIT_DBDFIPMSTRCNF_PMSTREN));
/* Set the Self-Refresh mode */
mmio_write_32(DBSC4_REG_DBACEN, 0);