This patch adds a Wakeup dependency of PER domain on WKUP
domain as a Workaround for a OMAP3430 limitation which causes
PER domain GPIO's to drive random values while coming back
from OFF mode. This limitation applies to all silicon rev's
of OMAP3430.
Signed-off-by: Rajendra Nayak <rnayak@xxxxxx>
---
arch/arm/mach-omap2/pm34xx.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 80992c5..231b33e 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -86,6 +86,7 @@ static int (*_omap_save_secure_sram)(u32 *addr);
static struct powerdomain *mpu_pwrdm, *neon_pwrdm;
static struct powerdomain *core_pwrdm, *per_pwrdm;
static struct powerdomain *cam_pwrdm;
+static struct powerdomain *wkup_pwrdm;
static struct prm_setup_times prm_setup = {
.clksetup = 0xff,
@@ -1042,6 +1043,7 @@ int __init omap3_pm_init(void)
per_pwrdm = pwrdm_lookup("per_pwrdm");
core_pwrdm = pwrdm_lookup("core_pwrdm");
cam_pwrdm = pwrdm_lookup("cam_pwrdm");
+ wkup_pwrdm = pwrdm_lookup("wkup_pwrdm");
omap_push_sram_idle();
@@ -1063,6 +1065,13 @@ int __init omap3_pm_init(void)
*/
pwrdm_add_wkdep(per_pwrdm, core_pwrdm);
+ /*
+ * This is a WA for an OMAP limitation (Listed in the omap errata doc
+ * Section 2.23) which causes GPIO modules in PER domain to drive random
+ * values while coming back from OFF mode.
+ */
+ pwrdm_add_wkdep(per_pwrdm, wkup_pwrdm);
+
if (omap_type() != OMAP2_DEVICE_TYPE_GP) {
omap3_secure_ram_storage =
kmalloc(0x803F, GFP_KERNEL);
--
1.5.4.7
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