ALSA: pxa27x: rename pxa27x_assert_ac97reset()

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@newsguy.com>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

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