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authorAndrei Birjukov <andrei.birjukov@artecdesign.ee>2009-02-22 22:37:21 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-02-22 22:37:21 +0000
commitd82ad6d6833ee8248e6c34e1b9fc3c4e61e3f035 (patch)
tree4c9a2322132697d5023f8292de70f1da92082c2e
parent8cfd9e923be54ef66ce174a93f4592b444b96407 (diff)
downloadop-kernel-dev-d82ad6d6833ee8248e6c34e1b9fc3c4e61e3f035.zip
op-kernel-dev-d82ad6d6833ee8248e6c34e1b9fc3c4e61e3f035.tar.gz
[ARM] at91: fix for Atmel AT91 powersaving
We've discovered that our AT91SAM9260 board consumed too much power when returning from a slowclock low-power mode. RAM self-refresh is enabled in a bootloader in our case, this is how we saw a difference. Estimated ca. 30mA more on 4V battery than the same state before powersaving. After a small research we found that there seems to be a bogus sdram_selfrefresh_disable() call at the end of at91_pm_enter() call, which overwrites the LPR register with uninitialized value. Please find the suggested patch attached. This patch fixes correct restoring of LPR register of the Atmel AT91 SDRAM controller when returning from a power saving mode. Signed-off-by: Andrei Birjukov <andrei.birjukov@artecdesign.ee> Acked-by: Andrew Victor <linux@maxim.org.za> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/mach-at91/pm.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 9bb4f04..7ac812d 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -332,7 +332,6 @@ static int at91_pm_enter(suspend_state_t state)
at91_sys_read(AT91_AIC_IPR) & at91_sys_read(AT91_AIC_IMR));
error:
- sdram_selfrefresh_disable();
target_state = PM_SUSPEND_ON;
at91_irq_resume();
at91_gpio_resume();
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