Merge remote-tracking branch 'asoc/fix/pxa' into tmp

arch/arm/mach-pxa/include/mach/mfp-pxa27x.h

@@ -463,6 +463,9 @@
 	GPIO76_LCD_PCLK,	\
 	GPIO77_LCD_BIAS
 
+/* these enable a work-around for a hw bug in pxa27x during ac97 warm reset */
+#define GPIO113_AC97_nRESET_GPIO_HIGH MFP_CFG_OUT(GPIO113, AF0, DEFAULT)
+#define GPIO95_AC97_nRESET_GPIO_HIGH MFP_CFG_OUT(GPIO95, AF0, DEFAULT)
 
 extern int keypad_set_wake(unsigned int on);
 #endif /* __ASM_ARCH_MFP_PXA27X_H */

arch/arm/mach-pxa/pxa27x.c

@@ -47,9 +47,9 @@ void pxa27x_clear_otgph(void)
 EXPORT_SYMBOL(pxa27x_clear_otgph);
 
 static unsigned long ac97_reset_config[] = {
-	GPIO113_GPIO,
+	GPIO113_AC97_nRESET_GPIO_HIGH,
 	GPIO113_AC97_nRESET,
-	GPIO95_GPIO,
+	GPIO95_AC97_nRESET_GPIO_HIGH,
 	GPIO95_AC97_nRESET,
 };
 

sound/arm/pxa2xx-ac97-lib.c

@@ -18,6 +18,7 @@
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/io.h>
+#include <linux/gpio.h>
 
 #include <sound/ac97_codec.h>
 #include <sound/pxa2xx-lib.h>
@@ -148,6 +149,8 @@ static inline void pxa_ac97_warm_pxa27x(void)
 
 static inline void pxa_ac97_cold_pxa27x(void)
 {
+	unsigned int timeout;
+
 	GCR &=  GCR_COLD_RST;  /* clear everything but nCRST */
 	GCR &= ~GCR_COLD_RST;  /* then assert nCRST */
 
@@ -157,8 +160,10 @@ static inline void pxa_ac97_cold_pxa27x(void)
 	clk_enable(ac97conf_clk);
 	udelay(5);
 	clk_disable(ac97conf_clk);
-	GCR = GCR_COLD_RST;
-	udelay(50);
+	GCR = GCR_COLD_RST | GCR_WARM_RST;
+	timeout = 100;     /* wait for the codec-ready bit to be set */
+	while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--)
+		mdelay(1);
 }
 #endif
 
@@ -340,8 +345,21 @@ int pxa2xx_ac97_hw_probe(struct platform_device *dev)
 	}
 
 	if (cpu_is_pxa27x()) {
-		/* Use GPIO 113 as AC97 Reset on Bulverde */
+		/*
+		 * This gpio is needed for a work-around to a bug in the ac97
+		 * controller during warm reset.  The direction and level is set
+		 * here so that it is an output driven high when switching from
+		 * AC97_nRESET alt function to generic gpio.
+		 */
+		ret = gpio_request_one(reset_gpio, GPIOF_OUT_INIT_HIGH,
+				       "pxa27x ac97 reset");
+		if (ret < 0) {
+			pr_err("%s: gpio_request_one() failed: %d\n",
+			       __func__, ret);
+			goto err_conf;
+		}
 		pxa27x_assert_ac97reset(reset_gpio, 0);
+
 		ac97conf_clk = clk_get(&dev->dev, "AC97CONFCLK");
 		if (IS_ERR(ac97conf_clk)) {
 			ret = PTR_ERR(ac97conf_clk);
@@ -384,6 +402,8 @@ EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_probe);
 
 void pxa2xx_ac97_hw_remove(struct platform_device *dev)
 {
+	if (cpu_is_pxa27x())
+		gpio_free(reset_gpio);
 	GCR |= GCR_ACLINK_OFF;
 	free_irq(IRQ_AC97, NULL);
 	if (ac97conf_clk) {