linux-kernel - [PATCH v3 18/18] ASoC: core: Probe components on demand

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Date:	Thu,  6 Aug 2015 16:11:55 +0200
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	linux-kernel@...r.kernel.org
Cc:	Rob Herring <robh+dt@...nel.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Mark Brown <broonie@...nel.org>,
	Thierry Reding <thierry.reding@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-arm-kernel@...ts.infradead.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	devicetree@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-acpi@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Subject: [PATCH v3 18/18] ASoC: core: Probe components on demand

When looking up a component through its OF node, probe it if it hasn't
already.

The goal is to reduce deferred probes to a minimum, as it makes it very
cumbersome to find out why a device failed to probe, and can introduce
very big delays in when a critical device is probed.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
---

Changes in v3: None
Changes in v2: None

 sound/soc/soc-core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index c81aec9c872a..1157049b1a34 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -34,6 +34,7 @@
 #include <linux/ctype.h>
 #include <linux/slab.h>
 #include <linux/of.h>
+#include <linux/of_platform.h>
 #include <sound/core.h>
 #include <sound/jack.h>
 #include <sound/pcm.h>
@@ -865,10 +866,12 @@ static const struct snd_soc_dai_ops null_dai_ops = {
 };
 
 static struct snd_soc_component *soc_find_component(
-	const struct device_node *of_node, const char *name)
+	struct device_node *of_node, const char *name)
 {
 	struct snd_soc_component *component;
 
+	of_platform_probe(of_node);
+
 	lockdep_assert_held(&client_mutex);
 
 	list_for_each_entry(component, &component_list, list) {
@@ -890,6 +893,8 @@ static struct snd_soc_dai *snd_soc_find_dai(
 	struct snd_soc_dai *dai;
 	struct device_node *component_of_node;
 
+	of_platform_probe(dlc->of_node);
+
 	lockdep_assert_held(&client_mutex);
 
 	/* Find CPU DAI from registered DAIs*/
-- 
2.4.3

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