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OMAP3: PM: Set/clear T2 bit for Smartreflex on TWL 

Voltage control on TWL can be done using VMODE/I2C1/I2C_SR.
Since almost all platforms use I2C_SR on omap3, omap3_twl_init by
default expects that OMAP's I2C_SR is plugged in to TWL's I2C
and calls omap3_twl_set_sr_bit. On platforms where I2C_SR is not connected,
the board files are expected to call omap3_twl_set_sr_bit(false) to
ensure that I2C_SR path is not set for voltage control and prevent
the default behavior of omap3_twl_init.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Thara Gopinath <thara@ti.com>
Signed-off-by: Shweta Gulati <shweta.gulati@ti.com>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Kevin Hilman <khilman@ti.com>
This commit is contained in:
Thara Gopinath 2011-02-15 13:28:58 +05:30 committed by Kevin Hilman
parent 8c5ca4d29b
commit 4071318983
2 changed files with 61 additions and 0 deletions
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60
arch/arm/mach-omap2/omap_twl.c
View File

@ -59,8 +59,15 @@
static bool is_offset_valid;
static u8 smps_offset;
/*
* Flag to ensure Smartreflex bit in TWL
* being cleared in board file is not overwritten.
*/
static bool __initdata twl_sr_enable_autoinit;
#define TWL4030_DCDC_GLOBAL_CFG 0x06
#define REG_SMPS_OFFSET 0xE0
#define SMARTREFLEX_ENABLE BIT(3)
static unsigned long twl4030_vsel_to_uv(const u8 vsel)
{
@ -269,6 +276,18 @@ int __init omap3_twl_init(void)
omap3_core_volt_info.vp_vddmax = OMAP3630_VP2_VLIMITTO_VDDMAX;
}
/*
* The smartreflex bit on twl4030 specifies if the setting of voltage
* is done over the I2C_SR path. Since this setting is independent of
* the actual usage of smartreflex AVS module, we enable TWL SR bit
* by default irrespective of whether smartreflex AVS module is enabled
* on the OMAP side or not. This is because without this bit enabled,
* the voltage scaling through vp forceupdate/bypass mechanism of
* voltage scaling will not function on TWL over I2C_SR.
*/
if (!twl_sr_enable_autoinit)
omap3_twl_set_sr_bit(true);
voltdm = omap_voltage_domain_lookup("mpu");
omap_voltage_register_pmic(voltdm, &omap3_mpu_volt_info);
@ -277,3 +296,44 @@ int __init omap3_twl_init(void)
return 0;
}
/**
* omap3_twl_set_sr_bit() - Set/Clear SR bit on TWL
* @enable: enable SR mode in twl or not
*
* If 'enable' is true, enables Smartreflex bit on TWL 4030 to make sure
* voltage scaling through OMAP SR works. Else, the smartreflex bit
* on twl4030 is cleared as there are platforms which use OMAP3 and T2 but
* use Synchronized Scaling Hardware Strategy (ENABLE_VMODE=1) and Direct
* Strategy Software Scaling Mode (ENABLE_VMODE=0), for setting the voltages,
* in those scenarios this bit is to be cleared (enable = false).
*
* Returns 0 on sucess, error is returned if I2C read/write fails.
*/
int __init omap3_twl_set_sr_bit(bool enable)
{
u8 temp;
int ret;
if (twl_sr_enable_autoinit)
pr_warning("%s: unexpected multiple calls\n", __func__);
ret = twl_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER, &temp,
TWL4030_DCDC_GLOBAL_CFG);
if (ret)
goto err;
if (enable)
temp |= SMARTREFLEX_ENABLE;
else
temp &= ~SMARTREFLEX_ENABLE;
ret = twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, temp,
TWL4030_DCDC_GLOBAL_CFG);
if (!ret) {
twl_sr_enable_autoinit = true;
return 0;
}
err:
pr_err("%s: Error access to TWL4030 (%d)\n", __func__, ret);
return ret;
}

1
arch/arm/mach-omap2/pm.h
View File

@ -127,6 +127,7 @@ static inline void omap_enable_smartreflex_on_init(void) {}
#ifdef CONFIG_TWL4030_CORE
extern int omap3_twl_init(void);
extern int omap4_twl_init(void);
extern int omap3_twl_set_sr_bit(bool enable);
#else
static inline int omap3_twl_init(void)
{