When entering deep sleep, the value in the registers I2CFDR and I2CDFSRR are lost. This causes I2C access to fail after resuming.
Add suspend/resume routines to save/restore the registers I2CFDR and I2CDFSRR. Signed-off-by: Zhao Chenhui <[email protected]> Signed-off-by: Li Yang <[email protected]> --- drivers/i2c/busses/i2c-mpc.c | 30 ++++++++++++++++++++++++++++++ 1 files changed, 30 insertions(+), 0 deletions(-) diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c index a8ebb84..fb2627b 100644 --- a/drivers/i2c/busses/i2c-mpc.c +++ b/drivers/i2c/busses/i2c-mpc.c @@ -64,6 +64,9 @@ struct mpc_i2c { struct i2c_adapter adap; int irq; u32 real_clk; +#ifdef CONFIG_PM + u8 fdr, dfsrr; +#endif }; struct mpc_i2c_divider { @@ -668,6 +671,30 @@ static int __devexit fsl_i2c_remove(struct platform_device *op) return 0; }; +#ifdef CONFIG_PM +static int mpc_i2c_suspend(struct device *dev) +{ + struct mpc_i2c *i2c = dev_get_drvdata(dev); + + i2c->fdr = readb(i2c->base + MPC_I2C_FDR); + i2c->dfsrr = readb(i2c->base + MPC_I2C_DFSRR); + + return 0; +} + +static int mpc_i2c_resume(struct device *dev) +{ + struct mpc_i2c *i2c = dev_get_drvdata(dev); + + writeb(i2c->fdr, i2c->base + MPC_I2C_FDR); + writeb(i2c->dfsrr, i2c->base + MPC_I2C_DFSRR); + + return 0; +} + +SIMPLE_DEV_PM_OPS(mpc_i2c_pm_ops, mpc_i2c_suspend, mpc_i2c_resume); +#endif + static struct mpc_i2c_data mpc_i2c_data_512x __devinitdata = { .setup = mpc_i2c_setup_512x, }; @@ -712,6 +739,9 @@ static struct platform_driver mpc_i2c_driver = { .owner = THIS_MODULE, .name = DRV_NAME, .of_match_table = mpc_i2c_of_match, +#ifdef CONFIG_PM + .pm = &mpc_i2c_pm_ops, +#endif }, }; -- 1.6.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
