[alsa-devel] [PATCH 3/3] ALSA: pxa27x: rename pxa27x_assert_ac97reset()

[Mike Dunn]

This patch does nothing functionally, it just gives the function a new name and
modifies the prototype slightly in order to clarify what the function is doing
(which is not necessarily asserting the reset).
Some commentary also added.

Tested on a palm treo 680 machine.

Signed-off-by: Mike Dunn <mikedunn at newsguy.com>
---
 arch/arm/mach-pxa/pxa27x.c  |   20 ++++++++++++++------
 sound/arm/pxa2xx-ac97-lib.c |    8 ++++----
 2 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c
index 616cb87..69985b06 100644
--- a/arch/arm/mach-pxa/pxa27x.c
+++ b/arch/arm/mach-pxa/pxa27x.c
@@ -53,17 +53,25 @@ static unsigned long ac97_reset_config[] = {
 	GPIO95_AC97_nRESET,
 };
 
-void pxa27x_assert_ac97reset(int reset_gpio, int on)
+void pxa27x_configure_ac97reset(int reset_gpio, bool to_gpio)
 {
+	/*
+	 * This helper function is used to work around a bug in the pxa27x's
+	 * ac97 controller during a warm reset.  The configuration of the
+	 * reset_gpio is changed as follows:
+	 * to_gpio == true: configured to generic output gpio and driven high
+	 * to_gpio == false: configured to ac97 controller alt fn AC97_nRESET
+	 */
+
 	if (reset_gpio == 113)
-		pxa2xx_mfp_config(on ? &ac97_reset_config[0] :
-				       &ac97_reset_config[1], 1);
+		pxa2xx_mfp_config(to_gpio ? &ac97_reset_config[0] :
+				  &ac97_reset_config[1], 1);
 
 	if (reset_gpio == 95)
-		pxa2xx_mfp_config(on ? &ac97_reset_config[2] :
-				       &ac97_reset_config[3], 1);
+		pxa2xx_mfp_config(to_gpio ? &ac97_reset_config[2] :
+				  &ac97_reset_config[3], 1);
 }
-EXPORT_SYMBOL_GPL(pxa27x_assert_ac97reset);
+EXPORT_SYMBOL_GPL(pxa27x_configure_ac97reset);
 
 /* Crystal clock: 13MHz */
 #define BASE_CLK	13000000
diff --git a/sound/arm/pxa2xx-ac97-lib.c b/sound/arm/pxa2xx-ac97-lib.c
index fff7753..e6f4633 100644
--- a/sound/arm/pxa2xx-ac97-lib.c
+++ b/sound/arm/pxa2xx-ac97-lib.c
@@ -34,7 +34,7 @@ static struct clk *ac97_clk;
 static struct clk *ac97conf_clk;
 static int reset_gpio;
 
-extern void pxa27x_assert_ac97reset(int reset_gpio, int on);
+extern void pxa27x_configure_ac97reset(int reset_gpio, bool to_gpio);
 
 /*
  * Beware PXA27x bugs:
@@ -140,10 +140,10 @@ static inline void pxa_ac97_warm_pxa27x(void)
 	gsr_bits = 0;
 
 	/* warm reset broken on Bulverde, so manually keep AC97 reset high */
-	pxa27x_assert_ac97reset(reset_gpio, 1);
+	pxa27x_configure_ac97reset(reset_gpio, true);
 	udelay(10);
 	GCR |= GCR_WARM_RST;
-	pxa27x_assert_ac97reset(reset_gpio, 0);
+	pxa27x_configure_ac97reset(reset_gpio, false);
 	udelay(500);
 }
 
@@ -358,7 +358,7 @@ int pxa2xx_ac97_hw_probe(struct platform_device *dev)
 			       __func__, ret);
 			goto err_conf;
 		}
-		pxa27x_assert_ac97reset(reset_gpio, 0);
+		pxa27x_configure_ac97reset(reset_gpio, false);
 
 		ac97conf_clk = clk_get(&dev->dev, "AC97CONFCLK");
 		if (IS_ERR(ac97conf_clk)) {
-- 
1.7.8.6