From: Marek Vasut <marek.vasut@gmail.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] i.MX28: Make the stabilization delays shorter
Date: Tue, 31 Jan 2012 01:05:39 +0100 [thread overview]
Message-ID: <1327968339-20585-1-git-send-email-marek.vasut@gmail.com> (raw)
Cut down the VDDIO/VDDA regulator stabilization delays to 500 uS. That should be
enough according to the datasheet and bootlets.
Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Robert Deli?n <robert@delien.nl>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Matthias Fuchs <matthias.fuchs@esd.eu>
---
arch/arm/cpu/arm926ejs/mx28/spl_power_init.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/arm/cpu/arm926ejs/mx28/spl_power_init.c b/arch/arm/cpu/arm926ejs/mx28/spl_power_init.c
index c6c25d9..4b09b0c 100644
--- a/arch/arm/cpu/arm926ejs/mx28/spl_power_init.c
+++ b/arch/arm/cpu/arm926ejs/mx28/spl_power_init.c
@@ -805,7 +805,7 @@ void mx28_power_set_vddio(uint32_t new_target, uint32_t new_brownout)
if (powered_by_linreg ||
(readl(&power_regs->hw_power_sts) &
POWER_STS_VDD5V_GT_VDDIO))
- early_delay(1500);
+ early_delay(500);
else {
while (!(readl(&power_regs->hw_power_sts) &
POWER_STS_DC_OK))
@@ -842,7 +842,7 @@ void mx28_power_set_vddio(uint32_t new_target, uint32_t new_brownout)
if (powered_by_linreg ||
(readl(&power_regs->hw_power_sts) &
POWER_STS_VDD5V_GT_VDDIO))
- early_delay(1500);
+ early_delay(500);
else {
while (!(readl(&power_regs->hw_power_sts) &
POWER_STS_DC_OK))
@@ -902,7 +902,7 @@ void mx28_power_set_vddd(uint32_t new_target, uint32_t new_brownout)
if (powered_by_linreg ||
(readl(&power_regs->hw_power_sts) &
POWER_STS_VDD5V_GT_VDDIO))
- early_delay(1500);
+ early_delay(500);
else {
while (!(readl(&power_regs->hw_power_sts) &
POWER_STS_DC_OK))
@@ -939,7 +939,7 @@ void mx28_power_set_vddd(uint32_t new_target, uint32_t new_brownout)
if (powered_by_linreg ||
(readl(&power_regs->hw_power_sts) &
POWER_STS_VDD5V_GT_VDDIO))
- early_delay(1500);
+ early_delay(500);
else {
while (!(readl(&power_regs->hw_power_sts) &
POWER_STS_DC_OK))
--
1.7.8.3
next reply other threads:[~2012-01-31 0:05 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-31 0:05 Marek Vasut [this message]
2012-03-20 7:45 ` [U-Boot] [PATCH] i.MX28: Make the stabilization delays shorter Stefano Babic
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