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

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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 2013-01-26 00:48:56 -07:00
parent fa2002223e
commit aff2f7d90f
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, .class = &i2c_class,
.dev_attr = &i2c_dev_attr, .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 */ /* I2C2 */

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

@ -140,14 +140,6 @@ static int omap2_enter_full_retention(void)
return 0; 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 sti_console_enabled;
static int omap2_allow_mpu_retention(void) static int omap2_allow_mpu_retention(void)
@ -172,11 +164,6 @@ static int omap2_allow_mpu_retention(void)
static void omap2_enter_mpu_retention(void) static void omap2_enter_mpu_retention(void)
{ {
/* 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 /* The peripherals seem not to be able to wake up the MPU when
* it is in retention mode. */ * it is in retention mode. */
if (omap2_allow_mpu_retention()) { if (omap2_allow_mpu_retention()) {