diff --git a/arch/arm/mach-omap2/omap-mpuss-lowpower.c b/arch/arm/mach-omap2/omap-mpuss-lowpower.c
index 63a1dd708d808..fad6e8c7e69e0 100644
--- a/arch/arm/mach-omap2/omap-mpuss-lowpower.c
+++ b/arch/arm/mach-omap2/omap-mpuss-lowpower.c
@@ -320,6 +320,21 @@ int omap4_hotplug_cpu(unsigned int cpu, unsigned int power_state)
 }
 
 
+/*
+ * Enable Mercury Fast HG retention mode by default.
+ */
+static void enable_mercury_retention_mode(void)
+{
+	u32 reg;
+
+	reg = omap4_prcm_mpu_read_inst_reg(OMAP54XX_PRCM_MPU_DEVICE_INST,
+				  OMAP54XX_PRCM_MPU_PRM_PSCON_COUNT_OFFSET);
+	/* Enable HG_EN, HG_RAMPUP = fast mode */
+	reg |= BIT(24) | BIT(25);
+	omap4_prcm_mpu_write_inst_reg(reg, OMAP54XX_PRCM_MPU_DEVICE_INST,
+				      OMAP54XX_PRCM_MPU_PRM_PSCON_COUNT_OFFSET);
+}
+
 /*
  * Initialise OMAP4 MPUSS
  */
@@ -397,6 +412,7 @@ int __init omap4_mpuss_init(void)
 		cpu_context_offset = OMAP4_RM_CPU0_CPU0_CONTEXT_OFFSET;
 	} else if (soc_is_omap54xx() || soc_is_dra7xx()) {
 		cpu_context_offset = OMAP54XX_RM_CPU0_CPU0_CONTEXT_OFFSET;
+		enable_mercury_retention_mode();
 	}
 
 	return 0;