1 files changed, 23 insertions, 3 deletions

diff --git a/sound/arm/pxa2xx-ac97-lib.c b/sound/arm/pxa2xx-ac97-lib.c
index 6fc0ae90e5b1..fff7753e35c1 100644
--- a/sound/arm/pxa2xx-ac97-lib.c
+++ b/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) {