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arm/tegra: Harmony: Configure PMC for low-level interrupts 

Without this, the PMC continually detects an interrupt when the PMU_IRQ
line is high, causing the tps6686x IRQ handler thread to hog an entire
CPU.

This change was originally written by Wei Ni <wni@nvidia.com> for Seaboard
in the ChromeOS kernel.

Long-term, this should probably be moved into some kind of PMU driver,
or perhaps integrated into the GPIO/IRQ/pinmux system?

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Stephen Warren 2011-09-21 16:10:40 -06:00 committed by Olof Johansson
parent add29e61d4
commit 9eb4b91e69
1 changed files with 12 additions and 1 deletions
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13
arch/arm/mach-tegra/board-harmony-power.c
View File

@ -18,10 +18,11 @@
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/io.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/tps6586x.h>
#include <mach/iomap.h>
#include <mach/irqs.h>
#include "board-harmony.h"
@ -113,6 +114,16 @@ static struct i2c_board_info __initdata harmony_regulators[] = {
int __init harmony_regulator_init(void)
{
void __iomem *pmc = IO_ADDRESS(TEGRA_PMC_BASE);
u32 pmc_ctrl;
/*
* Configure the power management controller to trigger PMU
* interrupts when low
*/
pmc_ctrl = readl(pmc + PMC_CTRL);
writel(pmc_ctrl | PMC_CTRL_INTR_LOW, pmc + PMC_CTRL);
i2c_register_board_info(3, harmony_regulators, 1);
return 0;