[PATCH 11/14] omap4: Fix silicon version detection for early samples

[Santosh Shilimkar]

Few initial omap4 es2 samples IDCODE is same as es1. This patch
uses ARM cpuid register to detect the ES version for such samples

Signed-off-by: Santosh Shilimkar <santosh.shilimkar at ti.com>
---
 arch/arm/mach-omap2/id.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
index ae70ae9..0412233 100644
--- a/arch/arm/mach-omap2/id.c
+++ b/arch/arm/mach-omap2/id.c
@@ -308,6 +308,15 @@ static void __init omap4_check_revision(void)
 	hawkeye = (idcode >> 12) & 0xffff;
 	rev = (idcode >> 28) & 0xff;
 
+	/*
+	 * Few initial ES2.0 samples IDCODE is same as ES1.0
+	 * Use ARM register to detect the correct ES version
+	 */
+	if (!rev) {
+		idcode = read_cpuid(CPUID_ID);
+		rev = (idcode & 0xf) - 1;
+	}
+
 	switch (hawkeye) {
 	case 0xb852:
 		switch (rev) {
-- 
1.6.0.4