[PATCH 03/17] PM: Block CORE off when DSS is active

Tero Kristo
2009-10-16T11:04:31Z

From: Kalle Jokiniemi <kalle.jokiniemi@digia.com>

If CORE power domain is allowed to reach off state
while display is active, the display will go blank.
Fixed by adding a check in idle loop.

Signed-off-by: Kalle Jokiniemi <ext-kalle.jokiniemi@nokia.com>
Signed-off-by: Jouni Hogander <jouni.hogander@nokia.com>
---
arch/arm/mach-omap2/pm34xx.c | 9 ++++++++-
1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index e8704a6..52a3f2b 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -103,7 +103,7 @@ 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, *iva2_pwrdm;
+static struct powerdomain *cam_pwrdm, *iva2_pwrdm, *dss_pwrdm;

static struct prm_setup_vc prm_setup = {
.clksetup = 0xff,
@@ -427,6 +427,7 @@ void omap_sram_idle(void)
int mpu_next_state = PWRDM_POWER_ON;
int per_next_state = PWRDM_POWER_ON;
int core_next_state = PWRDM_POWER_ON;
+ int dss_state = PWRDM_POWER_ON;
int core_prev_state, per_prev_state;
u32 sdrc_pwr = 0;
int per_state_modified = 0;
@@ -469,6 +470,7 @@ void omap_sram_idle(void)
* save / restore.
*/
core_next_state = pwrdm_read_next_pwrst(core_pwrdm);
+ dss_state = pwrdm_read_pwrst(dss_pwrdm);
if (core_next_state < PWRDM_POWER_ON) {
core_saved_state = core_next_state;
if ((cm_read_mod_reg(CORE_MOD, CM_IDLEST1) & CORE_IDLEST1_ALL)
@@ -479,6 +481,10 @@ void omap_sram_idle(void)
CORE_IDLEST3_ALL) != CORE_IDLEST3_ALL) {
core_next_state = PWRDM_POWER_ON;
pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_ON);
+ } else if (core_next_state == PWRDM_POWER_OFF &&
+ dss_state == PWRDM_POWER_ON) {
+ core_next_state = PWRDM_POWER_RET;
+ pwrdm_set_next_pwrst(core_pwrdm, PWRDM_POWER_RET);
}
}

@@ -1234,6 +1240,7 @@ static int __init omap3_pm_init(void)
core_pwrdm = pwrdm_lookup("core_pwrdm");
cam_pwrdm = pwrdm_lookup("cam_pwrdm");
iva2_pwrdm = pwrdm_lookup("iva2_pwrdm");
+ dss_pwrdm = pwrdm_lookup("dss_pwrdm");

omap_push_sram_idle();
#ifdef CONFIG_SUSPEND
--
1.5.4.3