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ARM: OMAP2420: hwmod data/PM: use hwmod to block WFI when I2C active 

Use the HWMOD_BLOCK_WFI flag in the hwmod data to prevent the MPU from
entering WFI when the I2C devices are active.  No idea why this is needed;
this could certainly bear further investigation if anyone is interested.
The objective here is to remove some custom code from the OMAP24xx PM
code.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Paul Walmsley 2012-12-30 10:31:52 -07:00
parent db27c0c0d0
commit 1e3d8fe771
2 changed files with 6 additions and 14 deletions
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7
arch/arm/mach-omap2/omap_hwmod_2420_data.c
View File

@ -121,7 +121,12 @@ static struct omap_hwmod omap2420_i2c1_hwmod = {
},
.class = &i2c_class,
.dev_attr = &i2c_dev_attr,
.flags = HWMOD_16BIT_REG,
/*
* From mach-omap2/pm24xx.c: "Putting MPU into the WFI state
* while a transfer is active seems to cause the I2C block to
* timeout. Why? Good question."
*/
.flags = (HWMOD_16BIT_REG | HWMOD_BLOCK_WFI),
};
/* I2C2 */

13
arch/arm/mach-omap2/pm24xx.c
View File

@ -139,14 +139,6 @@ no_sleep:
return 0;
}
static int omap2_i2c_active(void)
{
u32 l;
l = omap2_cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
return l & (OMAP2420_EN_I2C2_MASK | OMAP2420_EN_I2C1_MASK);
}
static int sti_console_enabled;
static int omap2_allow_mpu_retention(void)
@ -173,11 +165,6 @@ static void omap2_enter_mpu_retention(void)
{
const int zero = 0;
/* Putting MPU into the WFI state while a transfer is active
* seems to cause the I2C block to timeout. Why? Good question. */
if (omap2_i2c_active())
return;
/* The peripherals seem not to be able to wake up the MPU when
* it is in retention mode. */
if (omap2_allow_mpu_retention()) {