[SOUND] CS4231 SBus: Two fixes.

Remove unnecessary sbus_dma_reset function and change sbus_dma_enable
to avoid occasional system crashes when stopping recording.

Signed-off-by: Georg Chini <georg.chini@triaton-webhosting.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 37 deletions

diff --git a/sound/sparc/cs4231.c b/sound/sparc/cs4231.c
index dca0344cc1bc..f2950cab74a6 100644
--- a/sound/sparc/cs4231.c
+++ b/sound/sparc/cs4231.c
@@ -74,7 +74,6 @@ struct cs4231_dma_control {
         void            (*enable)(struct cs4231_dma_control *dma_cont, int on);
         int             (*request)(struct cs4231_dma_control *dma_cont, dma_addr_t bus_addr, size_t len);
         unsigned int    (*address)(struct cs4231_dma_control *dma_cont);
-        void            (*reset)(struct snd_cs4231 *chip); 
         void            (*preallocate)(struct snd_cs4231 *chip, struct snd_pcm *pcm); 
 #ifdef EBUS_SUPPORT
         struct          ebus_dma_info   ebus_info;
@@ -1214,10 +1213,6 @@ static int __init snd_cs4231_probe(struct snd_cs4231 *chip)
 
         spin_lock_irqsave(&chip->lock, flags);
 
-
-        /* Reset DMA engine (sbus only).  */
-        chip->p_dma.reset(chip);
-
         __cs4231_readb(chip, CS4231P(chip, STATUS));    /* clear any pendings IRQ */
         __cs4231_writeb(chip, 0, CS4231P(chip, STATUS));
         mb();
@@ -1861,14 +1856,13 @@ static void sbus_dma_enable(struct cs4231_dma_control *dma_cont, int on)
         if (!on) {
                 sbus_writel(0, base->regs + base->dir + APCNC);
                 sbus_writel(0, base->regs + base->dir + APCNVA);
-                sbus_writel(0, base->regs + base->dir + APCC);
-                sbus_writel(0, base->regs + base->dir + APCVA);
+                if ( base->dir == APC_PLAY ) {
+                        sbus_writel(0, base->regs + base->dir + APCC);
+                        sbus_writel(0, base->regs + base->dir + APCVA);
+                }
 
-                /* ACK any APC interrupts. */
-                csr = sbus_readl(base->regs + APCCSR);
-                sbus_writel(csr, base->regs + APCCSR);
+                udelay(1200);
         } 
-        udelay(1000);
         csr = sbus_readl(base->regs + APCCSR);
         shift = 0;
         if ( base->dir == APC_PLAY )
@@ -1894,23 +1888,6 @@ static unsigned int sbus_dma_addr(struct cs4231_dma_control *dma_cont)
         return sbus_readl(base->regs + base->dir + APCVA);
 }
 
-static void sbus_dma_reset(struct snd_cs4231 *chip)
-{
-        sbus_writel(APC_CHIP_RESET, chip->port + APCCSR);
-        sbus_writel(0x00, chip->port + APCCSR);
-        sbus_writel(sbus_readl(chip->port + APCCSR) | APC_CDC_RESET,
-                    chip->port + APCCSR);
-  
-        udelay(20);
-  
-        sbus_writel(sbus_readl(chip->port + APCCSR) & ~APC_CDC_RESET,
-                    chip->port + APCCSR);
-        sbus_writel(sbus_readl(chip->port + APCCSR) | (APC_XINT_ENA |
-                       APC_XINT_PENA |
-                       APC_XINT_CENA),
-                       chip->port + APCCSR);
-}
-
 static void sbus_dma_preallocate(struct snd_cs4231 *chip, struct snd_pcm *pcm)
 {
         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_SBUS,
@@ -1986,14 +1963,12 @@ static int __init snd_cs4231_sbus_create(struct snd_card *card,
         chip->p_dma.enable = sbus_dma_enable;
         chip->p_dma.request = sbus_dma_request;
         chip->p_dma.address = sbus_dma_addr;
-        chip->p_dma.reset = sbus_dma_reset;
         chip->p_dma.preallocate = sbus_dma_preallocate;
 
         chip->c_dma.prepare = sbus_dma_prepare;
         chip->c_dma.enable = sbus_dma_enable;
         chip->c_dma.request = sbus_dma_request;
         chip->c_dma.address = sbus_dma_addr;
-        chip->c_dma.reset = sbus_dma_reset;
         chip->c_dma.preallocate = sbus_dma_preallocate;
 
         if (request_irq(sdev->irqs[0], snd_cs4231_sbus_interrupt,
@@ -2087,11 +2062,6 @@ static unsigned int _ebus_dma_addr(struct cs4231_dma_control *dma_cont)
         return ebus_dma_addr(&dma_cont->ebus_info);
 }
 
-static void _ebus_dma_reset(struct snd_cs4231 *chip)
-{
-        return;
-}
-
 static void _ebus_dma_preallocate(struct snd_cs4231 *chip, struct snd_pcm *pcm)
 {
         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
@@ -2171,14 +2141,12 @@ static int __init snd_cs4231_ebus_create(struct snd_card *card,
         chip->p_dma.enable = _ebus_dma_enable;
         chip->p_dma.request = _ebus_dma_request;
         chip->p_dma.address = _ebus_dma_addr;
-        chip->p_dma.reset = _ebus_dma_reset;
         chip->p_dma.preallocate = _ebus_dma_preallocate;
 
         chip->c_dma.prepare = _ebus_dma_prepare;
         chip->c_dma.enable = _ebus_dma_enable;
         chip->c_dma.request = _ebus_dma_request;
         chip->c_dma.address = _ebus_dma_addr;
-        chip->c_dma.reset = _ebus_dma_reset;
         chip->c_dma.preallocate = _ebus_dma_preallocate;
 
         chip->port = ioremap(edev->resource[0].start, 0x10);