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 <[email protected]>
Signed-off-by: Kenji Miyazawa <[email protected]>
Signed-off-by: Chiaki Fujii <[email protected]>
Change-Id: I838fa0892b1caf1ecd3f04538b3427e7d971ef59

diff --git a/drivers/renesas/rcar/pwrc/pwrc.c b/drivers/renesas/rcar/pwrc/pwrc.c
index 8bea1b51d551b1bf75990edbbe2aca91bf80ad80..e223f07156b2496b00693b95c17d9a286222fa24 100644 (file)
--- a/drivers/renesas/rcar/pwrc/pwrc.c
+++ b/drivers/renesas/rcar/pwrc/pwrc.c
@@ -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);