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Commit 3daadf33 authored by Georg Chini's avatar Georg Chini Committed by David S. Miller
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[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: default avatarGeorg Chini <georg.chini@triaton-webhosting.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3fc701d5

sound/sparc/cs4231.c

+5 −37
Original line number Diff line number Diff line
@@ -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);

		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);