ARM: 6755/1: omap4: l2x0: Populate set_debug() function and enable Errata 727915

Populate the l2x0 set_debug function pointer with OMAP secure call
and enable the PL310 Errata 727915

This patch has dependency on the earlier patch
ARM: l2x0: Errata fix for flush by Way operation can cause data
corruption
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-omap2/Kconfig

@@ -45,6 +45,7 @@ config ARCH_OMAP4
 	select CPU_V7
 	select ARM_GIC
 	select PL310_ERRATA_588369
+	select PL310_ERRATA_727915
 	select ARM_ERRATA_720789
 	select ARCH_HAS_OPP
 	select PM_OPP if PM

arch/arm/mach-omap2/omap4-common.c

@@ -52,6 +52,12 @@ static void omap4_l2x0_disable(void)
 	omap_smc1(0x102, 0x0);
 }
 
+static void omap4_l2x0_set_debug(unsigned long val)
+{
+	/* Program PL310 L2 Cache controller debug register */
+	omap_smc1(0x100, val);
+}
+
 static int __init omap_l2_cache_init(void)
 {
 	u32 aux_ctrl = 0;
@@ -99,6 +105,7 @@ static int __init omap_l2_cache_init(void)
 	 * specific one
 	*/
 	outer_cache.disable = omap4_l2x0_disable;
+	outer_cache.set_debug = omap4_l2x0_set_debug;
 
 	return 0;
 }