Merge branch 'Issue-23_kernel_loading_problem_on_beagleboard_xM_Rev_A…

…' into develop

board/beagleboard/xm/kernel-patches/linux-0005-Put-the-IVA2-DPLL-in-stop-mode-before-un-reset-IVA2.patch

@@ -0,0 +1,62 @@
+From 8717b70a5a23395239235ec419f1802ef6293466 Mon Sep 17 00:00:00 2001
+From: Max Galemin <[email protected]>
+Date: Thu, 8 Mar 2012 23:18:06 +1100
+Subject: [PATCH] Put the IVA2 DPLL in stop mode before un-reset IVA2 module
+
+1. For 1 GHz operation before un-resetting the IVA2 module in omap3_iva_idle()
+the IVA2 DPLL needs to be put in low power stop mode as bootloader can enable
+the IVA2 DPLL in lock mode which can potentially lead to instability. Previous
+IVA2 DPLL mode can be restored after IVA2 reset.
+---
+ arch/arm/mach-omap2/pm34xx.c |   14 ++++++++++++++
+ 1 files changed, 14 insertions(+), 0 deletions(-)
+
+diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
+index efa6649..bcb1985 100644
+--- a/arch/arm/mach-omap2/pm34xx.c
++++ b/arch/arm/mach-omap2/pm34xx.c
+@@ -50,6 +50,7 @@
+ #include "pm.h"
+ #include "sdrc.h"
+ #include "control.h"
++#include "clock.h"
+
+ #ifdef CONFIG_SUSPEND
+ static suspend_state_t suspend_state = PM_SUSPEND_ON;
+@@ -612,6 +613,8 @@ static const struct platform_suspend_ops omap_pm_ops = {
+  **/
+ static void __init omap3_iva_idle(void)
+ {
++	u32 iva2_dpll;
++
+ 	/* ensure IVA2 clock is disabled */
+ 	omap2_cm_write_mod_reg(0, OMAP3430_IVA2_MOD, CM_FCLKEN);
+
+@@ -620,6 +623,13 @@ static void __init omap3_iva_idle(void)
+ 	      OMAP3430_CLKACTIVITY_IVA2_MASK))
+ 		return;
+
++	iva2_dpll = omap2_cm_read_mod_reg(OMAP3430_IVA2_MOD,
++			  OMAP3430_CM_CLKEN_PLL);
++
++	/* Put the IVA2 DPLL in low power stop mode */
++	omap2_cm_write_mod_reg((iva2_dpll & ~OMAP3430_EN_IVA2_DPLL_MASK) |
++			  DPLL_LOW_POWER_STOP, OMAP3430_IVA2_MOD, OMAP3430_CM_CLKEN_PLL);
++
+ 	/* Reset IVA2 */
+ 	omap2_prm_write_mod_reg(OMAP3430_RST1_IVA2_MASK |
+ 			  OMAP3430_RST2_IVA2_MASK |
+@@ -645,6 +655,10 @@ static void __init omap3_iva_idle(void)
+ 			  OMAP3430_RST2_IVA2_MASK |
+ 			  OMAP3430_RST3_IVA2_MASK,
+ 			  OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
++
++	/* Restore the IVA2 DPLL value */
++	omap2_cm_write_mod_reg(iva2_dpll, OMAP3430_IVA2_MOD,
++			  OMAP3430_CM_CLKEN_PLL);
+ }
+
+ static void __init omap3_d2d_idle(void)
+-- 
+1.7.5.4
+