X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=sound%2Farm%2Fpxa2xx-ac97.c;h=3acbc6023d1979b1f5c347907b79a3eab5ad887c;hb=1a56f54c351d8d2e276aefc4f4094037c178d6c7;hp=d9efc37393eebb0ad0e82086e47795492dff110c;hpb=d18f83764e376dea9e14a8ac53d1e14004fa9c13;p=pandora-kernel.git

diff --git a/sound/arm/pxa2xx-ac97.c b/sound/arm/pxa2xx-ac97.c
index d9efc37393ee..3acbc6023d19 100644
--- a/sound/arm/pxa2xx-ac97.c
+++ b/sound/arm/pxa2xx-ac97.c
@@ -37,39 +37,47 @@ static DECLARE_MUTEX(car_mutex);
 static DECLARE_WAIT_QUEUE_HEAD(gsr_wq);
 static volatile long gsr_bits;
 
+/*
+ * Beware PXA27x bugs:
+ *
+ *   o Slot 12 read from modem space will hang controller.
+ *   o CDONE, SDONE interrupt fails after any slot 12 IO.
+ *
+ * We therefore have an hybrid approach for waiting on SDONE (interrupt or
+ * 1 jiffy timeout if interrupt never comes).
+ */ 
+
 static unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
 {
 	unsigned short val = -1;
 	volatile u32 *reg_addr;
 
 	down(&car_mutex);
-	if (CAR & CAR_CAIP) {
-		printk(KERN_CRIT"%s: CAR_CAIP already set\n", __FUNCTION__);
-		goto out;
-	}
 
 	/* set up primary or secondary codec space */
 	reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
 	reg_addr += (reg >> 1);
 
 	/* start read access across the ac97 link */
+	GSR = GSR_CDONE | GSR_SDONE;
 	gsr_bits = 0;
 	val = *reg_addr;
 	if (reg == AC97_GPIO_STATUS)
 		goto out;
-	wait_event_timeout(gsr_wq, gsr_bits & GSR_SDONE, 1);
-	if (!gsr_bits & GSR_SDONE) {
+	if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1) <= 0 &&
+	    !((GSR | gsr_bits) & GSR_SDONE)) {
 		printk(KERN_ERR "%s: read error (ac97_reg=%d GSR=%#lx)\n",
-				__FUNCTION__, reg, gsr_bits);
+				__FUNCTION__, reg, GSR | gsr_bits);
 		val = -1;
 		goto out;
 	}
 
 	/* valid data now */
+	GSR = GSR_CDONE | GSR_SDONE;
 	gsr_bits = 0;
 	val = *reg_addr;			
 	/* but we've just started another cycle... */
-	wait_event_timeout(gsr_wq, gsr_bits & GSR_SDONE, 1);
+	wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
 
 out:	up(&car_mutex);
 	return val;
@@ -81,22 +89,19 @@ static void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigne
 
 	down(&car_mutex);
 
-	if (CAR & CAR_CAIP) {
-		printk(KERN_CRIT "%s: CAR_CAIP already set\n", __FUNCTION__);
-		goto out;
-	}
-
 	/* set up primary or secondary codec space */
 	reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
 	reg_addr += (reg >> 1);
+
+	GSR = GSR_CDONE | GSR_SDONE;
 	gsr_bits = 0;
 	*reg_addr = val;
-	wait_event_timeout(gsr_wq, gsr_bits & GSR_CDONE, 1);
-	if (!gsr_bits & GSR_SDONE)
+	if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1) <= 0 &&
+	    !((GSR | gsr_bits) & GSR_CDONE))
 		printk(KERN_ERR "%s: write error (ac97_reg=%d GSR=%#lx)\n",
-				__FUNCTION__, reg, gsr_bits);
+				__FUNCTION__, reg, GSR | gsr_bits);
 
-out:	up(&car_mutex);
+	up(&car_mutex);
 }
 
 static void pxa2xx_ac97_reset(struct snd_ac97 *ac97)
@@ -247,30 +252,28 @@ static struct pxa2xx_pcm_client pxa2xx_ac97_pcm_client = {
 
 static int pxa2xx_ac97_do_suspend(struct snd_card *card, pm_message_t state)
 {
-	if (card->power_state != SNDRV_CTL_POWER_D3cold) {
-		pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
-		snd_pcm_suspend_all(pxa2xx_ac97_pcm);
-		snd_ac97_suspend(pxa2xx_ac97_ac97);
-		snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
-		if (platform_ops && platform_ops->suspend)
-			platform_ops->suspend(platform_ops->priv);
-		GCR |= GCR_ACLINK_OFF;
-		pxa_set_cken(CKEN2_AC97, 0);
-	}
+	pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
+
+	snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
+	snd_pcm_suspend_all(pxa2xx_ac97_pcm);
+	snd_ac97_suspend(pxa2xx_ac97_ac97);
+	if (platform_ops && platform_ops->suspend)
+		platform_ops->suspend(platform_ops->priv);
+	GCR |= GCR_ACLINK_OFF;
+	pxa_set_cken(CKEN2_AC97, 0);
 
 	return 0;
 }
 
 static int pxa2xx_ac97_do_resume(struct snd_card *card)
 {
-	if (card->power_state != SNDRV_CTL_POWER_D0) {
-		pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
-		pxa_set_cken(CKEN2_AC97, 1);
-		if (platform_ops && platform_ops->resume)
-			platform_ops->resume(platform_ops->priv);
-		snd_ac97_resume(pxa2xx_ac97_ac97);
-		snd_power_change_state(card, SNDRV_CTL_POWER_D0);
-	}
+	pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
+
+	pxa_set_cken(CKEN2_AC97, 1);
+	if (platform_ops && platform_ops->resume)
+		platform_ops->resume(platform_ops->priv);
+	snd_ac97_resume(pxa2xx_ac97_ac97);
+	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 
 	return 0;
 }
@@ -349,8 +352,6 @@ static int pxa2xx_ac97_probe(struct platform_device *dev)
 	snprintf(card->longname, sizeof(card->longname),
 		 "%s (%s)", dev->dev.driver->name, card->mixername);
 
-	snd_card_set_pm_callback(card, pxa2xx_ac97_do_suspend,
-				 pxa2xx_ac97_do_resume, NULL);
 	ret = snd_card_register(card);
 	if (ret == 0) {
 		platform_set_drvdata(dev, card);