According to measurements, reading the previous state of PER
domain after wfi takes ~11us on OPP2.
Removed this unneccessary latency from cases where we know
PER power domain did not try to enter off mode.
Signed-off-by: Kalle Jokiniemi <kalle.jokiniemi@xxxxxxxxx>
---
arch/arm/mach-omap2/pm34xx.c | 19 +++++++++++++------
1 files changed, 13 insertions(+), 6 deletions(-)
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 237c819..b70ea19 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -489,12 +489,19 @@ void omap_sram_idle(void)
/* PER */
if (per_next_state < PWRDM_POWER_ON) {
- per_prev_state = pwrdm_read_prev_pwrst(per_pwrdm);
- if (per_prev_state == PWRDM_POWER_OFF) {
- omap3_per_restore_context();
- omap3_gpio_restore_pad_context(0);
- } else if (per_next_state == PWRDM_POWER_OFF)
- omap3_gpio_restore_pad_context(1);
+ if (per_next_state == PWRDM_POWER_OFF) {
+ /*
+ * Reading the prev-state takes long time (11us@OPP2),
+ * only do it, if we really tried to put PER in OFF
+ */
+ per_prev_state = pwrdm_read_prev_pwrst(per_pwrdm);
+ if (per_prev_state == PWRDM_POWER_OFF) {
+ omap3_per_restore_context();
+ omap3_gpio_restore_pad_context(0);
+ } else if (per_next_state == PWRDM_POWER_OFF) {
+ omap3_gpio_restore_pad_context(1);
+ }
+ }
omap2_gpio_resume_after_idle();
omap_uart_resume_idle(2);
if (per_state_modified)
--
1.5.4.3
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