[PATCH RESEND] mfd: arizona: Fix initialisation of the PM runtime

Charles Keepax
2015-08-11T08:51:42Z

The PM runtime core by default assumes a chip is suspended when runtime
PM is enabled. Currently the arizona driver enables runtime PM when the
chip is fully active and then disables the DCVDD regulator at the end of
arizona_dev_init. This however has several problems, firstly the if we
reach the end of arizona_dev_init, we did not properly follow all the
proceedures for shutting down the chip, and most notably we never marked
the chip as cache only so any writes occuring between then and the next
PM runtime resume will be lost. Secondly, if we are already resumed when
we reach the end of dev_init, then at best we get unbalanced regulator
enable/disables at work we lose DCVDD whilst we need it.

Additionally, since the commit 4f0216409f7c ("mfd: arizona: Add better
support for system suspend"), the PM runtime operations may
disable/enable the IRQ, so the IRQs must now be enabled before we call
any PM operations.

This patch adds a call to pm_runtime_set_active to inform the PM core
that the device is starting up active and moves the PM enabling to
around the IRQ initialisation to avoid any PM callbacks happening until
the IRQs are initialised.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
---

This patch was marked as applied on the 24th of June but
doesn't seem to have shown up in your tree yet. Just
resending just in case it got missed as it is a fairly
important bug fix.

Thanks,
Charles

drivers/mfd/arizona-core.c | 14 ++++++--------
1 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index bc814b0..375b954 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -1201,10 +1201,6 @@ int arizona_dev_init(struct arizona *arizona)
arizona->pdata.gpio_defaults[i]);
}

- pm_runtime_set_autosuspend_delay(arizona->dev, 100);
- pm_runtime_use_autosuspend(arizona->dev);
- pm_runtime_enable(arizona->dev);
-
/* Chip default */
if (!arizona->pdata.clk32k_src)
arizona->pdata.clk32k_src = ARIZONA_32KZ_MCLK2;
@@ -1329,11 +1325,17 @@ int arizona_dev_init(struct arizona *arizona)
arizona->pdata.spk_fmt[i]);
}

+ pm_runtime_set_active(arizona->dev);
+ pm_runtime_enable(arizona->dev);
+
/* Set up for interrupts */
ret = arizona_irq_init(arizona);
if (ret != 0)
goto err_reset;

+ pm_runtime_set_autosuspend_delay(arizona->dev, 100);
+ pm_runtime_use_autosuspend(arizona->dev);
+
arizona_request_irq(arizona, ARIZONA_IRQ_CLKGEN_ERR, "CLKGEN error",
arizona_clkgen_err, arizona);
arizona_request_irq(arizona, ARIZONA_IRQ_OVERCLOCKED, "Overclocked",
@@ -1367,10 +1369,6 @@ int arizona_dev_init(struct arizona *arizona)
goto err_irq;
}

-#ifdef CONFIG_PM
- regulator_disable(arizona->dcvdd);
-#endif
-
return 0;

err_irq:
--
1.7.2.5