ARM: OMAP: Fix handling of errata i727

The errata is applicable on all OMAP4 (4430 and 4460/4470) and OMAP5
ES 1.0 devices. The current revision check erroneously implements this
on all DRA7 varients and with DRA722 device (which has only 1 EMIF instance)
infact causes an asynchronous abort and ends up masking it in CPSR,
only to be uncovered once the kernel switches to userspace.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Sricharan R <r.sricharan@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>

arch/arm/cpu/armv7/omap-common/hwinit-common.c

@@ -123,7 +123,8 @@ void s_init(void)
 	hw_data_init();
 
 #ifdef CONFIG_SPL_BUILD
-	if (warm_reset() && (omap_revision() <= OMAP5430_ES1_0))
+	if (warm_reset() &&
+	    (is_omap44xx() || (omap_revision() == OMAP5430_ES1_0)))
 		force_emif_self_refresh();
 #endif
 	watchdog_init();

arch/arm/include/asm/omap_common.h

@@ -595,6 +595,14 @@ static inline u32 omap_revision(void)
 	return *omap_si_rev;
 }
 
+#define OMAP44xx	0x44000000
+
+static inline u8 is_omap44xx(void)
+{
+	extern u32 *const omap_si_rev;
+	return (*omap_si_rev & 0xFF000000) == OMAP44xx;
+};
+
 #define OMAP54xx	0x54000000
 
 static inline u8 is_omap54xx(void)