ARM: OMAP: Avoid sleeping during arch_reset

If we call clk_get() from arch_reset we get ugly messages before
reboot.

Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c
index d1b648a4efbf..3d0792e0366b 100644
--- a/arch/arm/mach-omap2/clock.c
+++ b/arch/arm/mach-omap2/clock.c
@@ -36,6 +36,8 @@
 
 static struct prcm_config *curr_prcm_set;
 static u32 curr_perf_level = PRCM_FULL_SPEED;
+static struct clk *vclk;
+static struct clk *sclk;
 
 /*-------------------------------------------------------------------------
  * Omap2 specific clock functions
@@ -984,6 +986,20 @@ static void __init omap2_get_crystal_rate(struct clk *osc, struct clk *sys)
         sys->rate = sclk;
 }
 
+/*
+ * Set clocks for bypass mode for reboot to work.
+ */
+void omap2_clk_prepare_for_reboot(void)
+{
+        u32 rate;
+
+        if (vclk == NULL || sclk == NULL)
+                return;
+
+        rate = clk_get_rate(sclk);
+        clk_set_rate(vclk, rate);
+}
+
 #ifdef CONFIG_OMAP_RESET_CLOCKS
 static void __init omap2_disable_unused_clocks(void)
 {
@@ -1080,5 +1096,9 @@ int __init omap2_clk_init(void)
         if (cpu_is_omap2430())
                 clk_enable(&sdrc_ick);
 
+        /* Avoid sleeping sleeping during omap2_clk_prepare_for_reboot() */
+        vclk = clk_get(NULL, "virt_prcm_set");
+        sclk = clk_get(NULL, "sys_ck");
+
         return 0;
 }