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-rw-r--r--arch/arm/mach-omap2/sram34xx.S12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/sram34xx.S b/arch/arm/mach-omap2/sram34xx.S
index 487fa8609cd..f41f8d96ddb 100644
--- a/arch/arm/mach-omap2/sram34xx.S
+++ b/arch/arm/mach-omap2/sram34xx.S
@@ -41,8 +41,18 @@
#define SDRC_UNLOCK_DLL 0x1
/* SDRC_DLLA_CTRL bit settings */
+#define FIXEDDELAY_SHIFT 24
+#define FIXEDDELAY_MASK (0xff << FIXEDDELAY_SHIFT)
#define DLLIDLE_MASK 0x4
+/*
+ * SDRC_DLLA_CTRL default values: TI hardware team indicates that
+ * FIXEDDELAY should be initialized to 0xf. This apparently was
+ * empirically determined during process testing, so no derivation
+ * was provided.
+ */
+#define FIXEDDELAY_DEFAULT (0x0f << FIXEDDELAY_SHIFT)
+
/* SDRC_DLLA_STATUS bit settings */
#define LOCKSTATUS_MASK 0x4
@@ -103,6 +113,8 @@ return_to_sdram:
unlock_dll:
ldr r11, omap3_sdrc_dlla_ctrl
ldr r12, [r11]
+ and r12, r12, #FIXEDDELAY_MASK
+ orr r12, r12, #FIXEDDELAY_DEFAULT
orr r12, r12, #DLLIDLE_MASK
str r12, [r11] @ (no OCP barrier needed)
bx lr