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i.MX28: Make the stabilization delays shorter

PATCH New Marek Vasut 2 participants 2 messages Jan 31, 2012 – Mar 20, 2012 Arm (32-bit)

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Marek Vasut

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PATCH 1/1 i.MX28: Make the stabilization delays shorter

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 <[email protected]>
Cc Wolfgang Denk <[email protected]>
Cc Detlev Zundel <[email protected]>
Cc Stefano Babic <[email protected]>
Cc Robert Deli?n <[email protected]>
Cc Fabio Estevam <[email protected]>
Cc Matthias Fuchs <[email protected]>
---
 arch/arm/cpu/arm926ejs/mx28/spl_power_init.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
arch/arm/cpu/arm926ejs/mx28/spl_power_init.c +4 -4
index c6c25d9..4b09b0c 100644
@@ -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))
Signature · 1 line
1.7.8.3
#1 lore raw

PATCH 1/1 i.MX28: Make the stabilization delays shorter

Quoted 11 lines · Marek Vasut

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 <[email protected]>
Cc Wolfgang Denk <[email protected]>
Cc Detlev Zundel <[email protected]>
Cc Stefano Babic <[email protected]>
Cc Robert Deli?n <[email protected]>
Cc Fabio Estevam <[email protected]>
Cc Matthias Fuchs <[email protected]>

---

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

Best regards,
Stefano Babic

Signature · 5 lines
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