[PATCH v2] OMAP4: PM: Set static dependency between MPUSS and EMIF
Santosh Shilimkar
santosh.shilimkar at ti.com
Wed Mar 9 01:02:41 EST 2011
As per OMAP4430 TRM, the dynamic dependency between MEMIF and MPUSS
clockdomains is enable by default. Refer register CM_MPU_DYNAMICDEP
description for details.
But it doesn't seems to work as expected and MPUSS doesn't wakeup
from off-mode if the static dependency is not set between MPUSS and
EMIF clockdomains. i.e CM_MPU_STATICDEP.MEMIF_STATDEP = 0
The issue is under investigation with hardware team.
Signed-off-by: Rajendra Nayak <rnayak at ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar at ti.com>
Acked-by: Paul Walmsley <paul at pwsan.com>
Cc: Kevin Hilman <khilman at ti.com>
---
v2: Added a pr_info() suggested by Paul Walmsley
Patch applies on top of OMAP4 PM series.
Relevant thread on this issue:
http://www.mail-archive.com/linux-omap@vger.kernel.org/msg46173.html
arch/arm/mach-omap2/pm44xx.c | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/pm44xx.c b/arch/arm/mach-omap2/pm44xx.c
index d4ad31e..b3ce1b1 100644
--- a/arch/arm/mach-omap2/pm44xx.c
+++ b/arch/arm/mach-omap2/pm44xx.c
@@ -198,6 +198,7 @@ void omap4_pm_off_mode_enable(int enable)
static int __init omap4_pm_init(void)
{
int ret;
+ struct clockdomain *emif_clkdm, *mpuss_clkdm;
if (!cpu_is_omap44xx())
return -ENODEV;
@@ -213,6 +214,27 @@ static int __init omap4_pm_init(void)
(void) clkdm_for_each(clkdms_setup, NULL);
+ /*
+ * FIXME: Remove the MPUSS <-> EMIF static dependency once the
+ * dynamic dependency issue is root-caused.
+ * The dynamic dependency between MEMIF and MPUSS doesn't seems to
+ * work as expected and MPUSS does not wakeup from off-mode if
+ * the static dependency is not set between them.
+ * i.e. CM_MPU_STATICDEP.MEMIF_STATDEP = 0
+ */
+ mpuss_clkdm = clkdm_lookup("mpuss_clkdm");
+ emif_clkdm = clkdm_lookup("l3_emif_clkdm");
+ if ((!mpuss_clkdm) || (!emif_clkdm))
+ goto err2;
+
+ ret = clkdm_add_wkdep(mpuss_clkdm, emif_clkdm);
+ if (ret) {
+ pr_err("Failed to add MPUSS <-> EMIF wakeup dependency\n");
+ goto err2;
+ }
+
+ pr_info("OMAP4 PM: Temporary static dependency added between EMIF and MPUSS\n");
+
ret = omap4_mpuss_init();
if (ret) {
pr_err("Failed to initialise OMAP4 MPUSS\n");
--
1.6.0.4
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