linux-kernel - [PATCH] PM / Runtime: Handle clocks correctly if CONFIG_PM

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Message-Id: <201106210128.52101.rjw@sisk.pl>
Date:	Tue, 21 Jun 2011 01:28:51 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>
Cc:	Kevin Hilman <khilman@...com>, Magnus Damm <magnus.damm@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-sh@...r.kernel.org
Subject: [PATCH] PM / Runtime: Handle clocks correctly if CONFIG_PM_RUNTIME is unset

From: Rafael J. Wysocki <rjw@...k.pl>

Commit 85eb8c8d0b0900c073b0e6f89979ac9c439ade1a (PM / Runtime:
Generic clock manipulation rountines for runtime PM (v6)) converted
the shmobile platform to using generic code for runtime PM clock
management, but it changed the behavior for CONFIG_PM_RUNTIME unset
incorrectly.

Specifically, for CONFIG_PM_RUNTIME unset pm_runtime_clk_notify()
should enable clocks for action equal to BUS_NOTIFY_BIND_DRIVER and
it should disable them for action equal to BUS_NOTIFY_UNBOUND_DRIVER
(instead of BUS_NOTIFY_ADD_DEVICE and BUS_NOTIFY_DEL_DEVICE,
respectively).  Make this function behave as appropriate.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 drivers/base/power/clock_ops.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: linux-2.6/drivers/base/power/clock_ops.c
===================================================================
--- linux-2.6.orig/drivers/base/power/clock_ops.c
+++ linux-2.6/drivers/base/power/clock_ops.c
@@ -387,7 +387,7 @@ static int pm_runtime_clk_notify(struct
 	clknb = container_of(nb, struct pm_clk_notifier_block, nb);
 
 	switch (action) {
-	case BUS_NOTIFY_ADD_DEVICE:
+	case BUS_NOTIFY_BIND_DRIVER:
 		if (clknb->con_ids[0]) {
 			for (con_id = clknb->con_ids; *con_id; con_id++)
 				enable_clock(dev, *con_id);
@@ -395,7 +395,7 @@ static int pm_runtime_clk_notify(struct
 			enable_clock(dev, NULL);
 		}
 		break;
-	case BUS_NOTIFY_DEL_DEVICE:
+	case BUS_NOTIFY_UNBOUND_DRIVER:
 		if (clknb->con_ids[0]) {
 			for (con_id = clknb->con_ids; *con_id; con_id++)
 				disable_clock(dev, *con_id);
--
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