Commit aff2f7d9 authored by Paul Walmsley's avatar Paul Walmsley
Browse files

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: default avatarPaul Walmsley <paul@pwsan.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
parent fa200222

arch/arm/mach-omap2/omap_hwmod_2420_data.c

+6 −1
Original line number Diff line number Diff line
@@ -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 */

arch/arm/mach-omap2/pm24xx.c

+0 −13
Original line number Diff line number Diff line
@@ -140,14 +140,6 @@ 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)
@@ -172,11 +164,6 @@ static int omap2_allow_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

	 * it is in retention mode. */

	if (omap2_allow_mpu_retention()) {

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