From: Santosh Shilimkar <santosh.shilimkar@ti.com>
Date: Sat, 16 Feb 2013 12:25:08 +0000 (+0530)
Subject: ARM: OMAP4: PM: Remove L4 wakeup depedency with MPU since errata fix exist now
X-Git-Tag: v3.10-rc1~125^2~13^2^2~2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6cf38956c9838414b2678c7e661001313d200d8c;p=profile%2Fivi%2Fkernel-x86-ivi.git

ARM: OMAP4: PM: Remove L4 wakeup depedency with MPU since errata fix exist now

With commit bfd6d021 {ARM: OMAP3+: Implement timer workaround for errata
i103 and i767}, the sync and gptimer synchronization errata got fixed.

Hence the l4_wakeup static dependency with MPU can  can be removed
now. Static dependency was one of the proposed workaround but from
power savings perspective, it isn't an ideal workaround.

Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
---

diff --git a/arch/arm/mach-omap2/pm44xx.c b/arch/arm/mach-omap2/pm44xx.c
index 9e9095c..3b5a5a8 100644
--- a/arch/arm/mach-omap2/pm44xx.c
+++ b/arch/arm/mach-omap2/pm44xx.c
@@ -143,7 +143,7 @@ static void omap_default_idle(void)
 int __init omap4_pm_init(void)
 {
 	int ret;
-	struct clockdomain *emif_clkdm, *mpuss_clkdm, *l3_1_clkdm, *l4wkup;
+	struct clockdomain *emif_clkdm, *mpuss_clkdm, *l3_1_clkdm;
 	struct clockdomain *ducati_clkdm, *l3_2_clkdm, *l4_per_clkdm;
 
 	if (omap_rev() == OMAP4430_REV_ES1_0) {
@@ -171,19 +171,14 @@ int __init omap4_pm_init(void)
 	 * MPUSS -> L4_PER/L3_* and DUCATI -> L3_* doesn't work as
 	 * expected. The hardware recommendation is to enable static
 	 * dependencies for these to avoid system lock ups or random crashes.
-	 * The L4 wakeup depedency is added to workaround the OCP sync hardware
-	 * BUG with 32K synctimer which lead to incorrect timer value read
-	 * from the 32K counter. The BUG applies for GPTIMER1 and WDT2 which
-	 * are part of L4 wakeup clockdomain.
 	 */
 	mpuss_clkdm = clkdm_lookup("mpuss_clkdm");
 	emif_clkdm = clkdm_lookup("l3_emif_clkdm");
 	l3_1_clkdm = clkdm_lookup("l3_1_clkdm");
 	l3_2_clkdm = clkdm_lookup("l3_2_clkdm");
 	l4_per_clkdm = clkdm_lookup("l4_per_clkdm");
-	l4wkup = clkdm_lookup("l4_wkup_clkdm");
 	ducati_clkdm = clkdm_lookup("ducati_clkdm");
-	if ((!mpuss_clkdm) || (!emif_clkdm) || (!l3_1_clkdm) || (!l4wkup) ||
+	if ((!mpuss_clkdm) || (!emif_clkdm) || (!l3_1_clkdm) ||
 		(!l3_2_clkdm) || (!ducati_clkdm) || (!l4_per_clkdm))
 		goto err2;
 
@@ -191,7 +186,6 @@ int __init omap4_pm_init(void)
 	ret |= clkdm_add_wkdep(mpuss_clkdm, l3_1_clkdm);
 	ret |= clkdm_add_wkdep(mpuss_clkdm, l3_2_clkdm);
 	ret |= clkdm_add_wkdep(mpuss_clkdm, l4_per_clkdm);
-	ret |= clkdm_add_wkdep(mpuss_clkdm, l4wkup);
 	ret |= clkdm_add_wkdep(ducati_clkdm, l3_1_clkdm);
 	ret |= clkdm_add_wkdep(ducati_clkdm, l3_2_clkdm);
 	if (ret) {