Patchwork [U-Boot] i.MX28: Make the stabilization delays shorter

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Submitter Marek Vasut
Date Jan. 31, 2012, 12:05 a.m.
Message ID <1327968339-20585-1-git-send-email-marek.vasut@gmail.com>
Download mbox | patch
Permalink /patch/138672/
State Accepted
Commit a89300338a0d0c43ff21c50d793782c310c882ee
Delegated to: Stefano Babic
Headers show

Comments

Marek Vasut - Jan. 31, 2012, 12:05 a.m.
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 Deliën <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(-)
Stefano Babic - March 20, 2012, 7:45 a.m.
On 31/01/2012 01:05, Marek Vasut wrote:
> 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 Deliën <robert@delien.nl>
> Cc: Fabio Estevam <festevam@gmail.com>
> Cc: Matthias Fuchs <matthias.fuchs@esd.eu>
> ---

Applied to u-boot-imx (fix), thanks.

Best regards,
Stefano Babic

Patch

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))