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-rw-r--r--drivers/i2c/busses/i2c-pxa.c30
1 files changed, 24 insertions, 6 deletions
diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index 57fbffd1ccc..518b57c795c 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -909,12 +909,6 @@ static int i2c_pxa_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num
struct pxa_i2c *i2c = adap->algo_data;
int ret, i;
- /* If the I2C controller is disabled we need to reset it (probably due
- to a suspend/resume destroying state). We do this here as we can then
- avoid worrying about resuming the controller before its users. */
- if (!(readl(_ICR(i2c)) & ICR_IUE))
- i2c_pxa_reset(i2c);
-
for (i = adap->retries; i >= 0; i--) {
ret = i2c_pxa_do_xfer(i2c, msgs, num);
if (ret != I2C_RETRY)
@@ -1085,9 +1079,33 @@ static int __exit i2c_pxa_remove(struct platform_device *dev)
return 0;
}
+#ifdef CONFIG_PM
+static int i2c_pxa_suspend_late(struct platform_device *dev, pm_message_t state)
+{
+ struct pxa_i2c *i2c = platform_get_drvdata(dev);
+ clk_disable(i2c->clk);
+ return 0;
+}
+
+static int i2c_pxa_resume_early(struct platform_device *dev)
+{
+ struct pxa_i2c *i2c = platform_get_drvdata(dev);
+
+ clk_enable(i2c->clk);
+ i2c_pxa_reset(i2c);
+
+ return 0;
+}
+#else
+#define i2c_pxa_suspend_late NULL
+#define i2c_pxa_resume_early NULL
+#endif
+
static struct platform_driver i2c_pxa_driver = {
.probe = i2c_pxa_probe,
.remove = __exit_p(i2c_pxa_remove),
+ .suspend_late = i2c_pxa_suspend_late,
+ .resume_early = i2c_pxa_resume_early,
.driver = {
.name = "pxa2xx-i2c",
.owner = THIS_MODULE,