As per OMAP4430 TRM, the dynamic dependency between MPUSS -> EMIF
and MPUSS -> L3* and DUCATI -> L3 *clockdomains is enable by default.
Refer register CM_MPU_DYNAMICDEP description for details.
But these dynamic dependencies doesn't work as expected. The hardware
recommendation is to keep above dependencies.
Without this system locks up or randomly crashesh.
Signed-off-by: Rajendra Nayak <rna...@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilim...@ti.com>
Acked-by: Paul Walmsley <p...@pwsan.com>
Cc: Kevin Hilman <khil...@ti.com>
---
arch/arm/mach-omap2/pm44xx.c | 28 ++++++++++++++++++++++++++++
1 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/pm44xx.c b/arch/arm/mach-omap2/pm44xx.c
index 4bbc6fe..35ba028 100644
--- a/arch/arm/mach-omap2/pm44xx.c
+++ b/arch/arm/mach-omap2/pm44xx.c
@@ -116,6 +116,8 @@ static void omap_default_idle(void)
static int __init omap4_pm_init(void)
{
int ret;
+ struct clockdomain *emif_clkdm, *mpuss_clkdm, *l3_1_clkdm;
+ struct clockdomain *ducati_clkdm, *l3_2_clkdm;
if (!cpu_is_omap44xx())
return -ENODEV;
@@ -128,6 +130,32 @@ static int __init omap4_pm_init(void)
goto err2;
}
+ /*
+ * The dynamic dependency between MPUSS -> MEMIF and
+ * MPUSS -> L3_* and DUCATI -> doesn't work as expected.
+ * The hardware recommendation is to keep above dependencies.
+ * Without this system locks up or randomly crashesh.
+ */
+ 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");
+ ducati_clkdm = clkdm_lookup("ducati_clkdm");
+ if ((!mpuss_clkdm) || (!emif_clkdm) || (!l3_1_clkdm) ||
+ (!l3_2_clkdm) || (!ducati_clkdm))
+ goto err2;
+
+ ret = clkdm_add_wkdep(mpuss_clkdm, emif_clkdm);
+ ret |= clkdm_add_wkdep(mpuss_clkdm, l3_1_clkdm);
+ ret |= clkdm_add_wkdep(mpuss_clkdm, l3_2_clkdm);
+ ret |= clkdm_add_wkdep(ducati_clkdm, l3_1_clkdm);
+ ret |= clkdm_add_wkdep(ducati_clkdm, l3_2_clkdm);
+ if (ret) {
+ pr_err("Failed to add MPUSS -> L3/EMIF, DUCATI -> L3 "
+ "wakeup dependency\n");
+ goto err2;
+ }
+
#ifdef CONFIG_SUSPEND
suspend_set_ops(&omap_pm_ops);
#endif /* CONFIG_SUSPEND */
--
1.7.4.1
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