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glados / chell: Power Optimize S0ix PMIC VRs

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Allow VCCIO to decay to 0 and reduce the voltage of V0.85A supply in
S0ix.

BUG=chrome-os-partner:43908
TEST=Stress-test glados stability coming into and out of S0ix
BRANCH=glados

Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Change-Id: I5aa61164c43ac624cef86f478919294e4cd4e581
Reviewed-on: https://chromium-review.googlesource.com/293345
Commit-Ready: Shawn N <shawnn@chromium.org>
Tested-by: Shawn N <shawnn@chromium.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
This commit is contained in:
Shawn Nematbakhsh
2015-08-12 18:05:22 -07:00
committed by chrome-bot
parent 9e0506d331
commit 2e37a50b37
2 changed files with 24 additions and 0 deletions
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12
board/chell/board.c
View File

@@ -226,12 +226,24 @@ static void board_pmic_init(void)
if (system_jumped_to_this_image())
return;
/* Set CSDECAYEN / VCCIO decays to 0V at assertion of SLP_S0# */
i2c_write8(I2C_PORT_PMIC, I2C_ADDR_BD99992, 0x30, 0x4a);
/*
* Set V100ACNT / V1.00A Control Register:
* Nominal output = 1.0V.
*/
i2c_write8(I2C_PORT_PMIC, I2C_ADDR_BD99992, 0x37, 0x1a);
/*
* Set V085ACNT / V0.85A Control Register:
* Lower power mode = 0.7V.
* Nominal output = 1.0V.
*/
i2c_write8(I2C_PORT_PMIC, I2C_ADDR_BD99992, 0x38, 0x7a);
/* VRMODECTRL - enable low-power mode for VCCIO and V0.85A */
i2c_write8(I2C_PORT_PMIC, I2C_ADDR_BD99992, 0x3b, 0x18);
}
DECLARE_HOOK(HOOK_INIT, board_pmic_init, HOOK_PRIO_DEFAULT);

12
board/glados/board.c
View File

@@ -230,12 +230,24 @@ static void board_pmic_init(void)
if (system_jumped_to_this_image())
return;
/* Set CSDECAYEN / VCCIO decays to 0V at assertion of SLP_S0# */
i2c_write8(I2C_PORT_PMIC, I2C_ADDR_BD99992, 0x30, 0x4a);
/*
* Set V100ACNT / V1.00A Control Register:
* Nominal output = 1.0V.
*/
i2c_write8(I2C_PORT_PMIC, I2C_ADDR_BD99992, 0x37, 0x1a);
/*
* Set V085ACNT / V0.85A Control Register:
* Lower power mode = 0.7V.
* Nominal output = 1.0V.
*/
i2c_write8(I2C_PORT_PMIC, I2C_ADDR_BD99992, 0x38, 0x7a);
/* VRMODECTRL - enable low-power mode for VCCIO and V0.85A */
i2c_write8(I2C_PORT_PMIC, I2C_ADDR_BD99992, 0x3b, 0x18);
}
DECLARE_HOOK(HOOK_INIT, board_pmic_init, HOOK_PRIO_DEFAULT);