[3.16.y-ckt stable] Patch "mfd: arizona: Fix initialisation of the PM runtime" has been added to staging queue

Luis Henriques luis.henriques at canonical.com
Thu Sep 3 10:37:23 UTC 2015


This is a note to let you know that I have just added a patch titled

    mfd: arizona: Fix initialisation of the PM runtime

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt17.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 6c3505ca3663a5ff114d0db6778f979560ae65f9 Mon Sep 17 00:00:00 2001
From: Charles Keepax <ckeepax at opensource.wolfsonmicro.com>
Date: Sun, 14 Jun 2015 15:41:50 +0100
Subject: mfd: arizona: Fix initialisation of the PM runtime

commit 72e43164fd472f6c2659c8313b87da962322dbcf upstream.

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 occurring 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 at opensource.wolfsonmicro.com>
Signed-off-by: Lee Jones <lee.jones at linaro.org>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/mfd/arizona-core.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index cfc191abae4a..1577e6418306 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -867,10 +867,6 @@ 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;
@@ -966,11 +962,17 @@ 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",
@@ -998,10 +1000,6 @@ int arizona_dev_init(struct arizona *arizona)
 		goto err_irq;
 	}

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

 err_irq:




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