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authorPatrick Titiano <p-titiano@ti.com>2011-05-18 00:17:30 -0500
committerKevin Hilman <khilman@ti.com>2011-09-15 12:09:36 -0700
commit58e241f7be8dfbb19fa8f5bf8b2e56bb6d655752 (patch)
tree51beb0327c341f11503a0d76d1689a7b62f4f67f /arch/arm/mach-omap2/omap_twl.c
parent42b43945e0f115412dd0b7f0c3609a8b6f24f5e5 (diff)
OMAP4: PM: TWL6030: fix voltage conversion formula
omap_twl_vsel_to_uv() and omap_twl_uv_to_vsel() functions used to convert voltages to TWL6030 SMPS commands (a.k.a "vsel") implement incorrect conversion formula. It uses legacy OMAP3 formula, but OMAP4 Power IC has different offset and voltage step: - Voltage Step is now 12.66mV (instead of 12.5mV) - Offset is either 607.7mV or 709mV depending on TWL6030 chip revision (instead of 600mV) This leads to setting voltages potentially higher than expected, and so potentially some (limited) power overconsumption. For reference, see formula and tables in section 8.5.2.3 "Output Voltage Selection (Standard Mode / Extended Mode with or without offset)" in TWL6030 functional specifications document. [nm@ti.com: ported to voltdm_c] Signed-off-by: Nishanth Menon <nm@ti.com> Signed-off-by: Patrick Titiano <p-titiano@ti.com>
Diffstat (limited to 'arch/arm/mach-omap2/omap_twl.c')
-rw-r--r--arch/arm/mach-omap2/omap_twl.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/arch/arm/mach-omap2/omap_twl.c b/arch/arm/mach-omap2/omap_twl.c
index 6b247d18329..a66bf6b9fb0 100644
--- a/arch/arm/mach-omap2/omap_twl.c
+++ b/arch/arm/mach-omap2/omap_twl.c
@@ -106,9 +106,9 @@ static unsigned long twl6030_vsel_to_uv(const u8 vsel)
return 1350000;
if (smps_offset & 0x8)
- return ((((vsel - 1) * 125) + 7000)) * 100;
+ return ((((vsel - 1) * 1266) + 70900)) * 10;
else
- return ((((vsel - 1) * 125) + 6000)) * 100;
+ return ((((vsel - 1) * 1266) + 60770)) * 10;
}
static u8 twl6030_uv_to_vsel(unsigned long uv)
@@ -138,9 +138,9 @@ static u8 twl6030_uv_to_vsel(unsigned long uv)
return 0x3A;
if (smps_offset & 0x8)
- return DIV_ROUND_UP(uv - 700000, 12500) + 1;
+ return DIV_ROUND_UP(uv - 709000, 12660) + 1;
else
- return DIV_ROUND_UP(uv - 600000, 12500) + 1;
+ return DIV_ROUND_UP(uv - 607700, 12660) + 1;
}
static struct omap_voltdm_pmic omap3_mpu_pmic = {
@@ -187,7 +187,7 @@ static struct omap_voltdm_pmic omap3_core_pmic = {
static struct omap_voltdm_pmic omap4_mpu_pmic = {
.slew_rate = 4000,
- .step_size = 12500,
+ .step_size = 12660,
.on_volt = 1350000,
.onlp_volt = 1350000,
.ret_volt = 837500,
@@ -208,7 +208,7 @@ static struct omap_voltdm_pmic omap4_mpu_pmic = {
static struct omap_voltdm_pmic omap4_iva_pmic = {
.slew_rate = 4000,
- .step_size = 12500,
+ .step_size = 12660,
.on_volt = 1100000,
.onlp_volt = 1100000,
.ret_volt = 837500,
@@ -229,7 +229,7 @@ static struct omap_voltdm_pmic omap4_iva_pmic = {
static struct omap_voltdm_pmic omap4_core_pmic = {
.slew_rate = 4000,
- .step_size = 12500,
+ .step_size = 12660,
.on_volt = 1100000,
.onlp_volt = 1100000,
.ret_volt = 837500,