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ARM: OMAP: McBSP: Fix legacy interrupts to clear their status

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If XSYNCERR or RSYNCERR interrupts are enabled, they are never
cleared causing the IRQ handler to be continuously called.
This patch clears the IRQs in question in the event they are
enabled and taken.

Signed-off-by: Eero Nurkkala <ext-eero.nurkkala@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Eero Nurkkala 2009-05-25 11:08:42 -07:00 committed by Tony Lindgren
parent e85c205ac1
commit d6d834b010
1 changed files with 24 additions and 6 deletions
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30
arch/arm/plat-omap/mcbsp.c
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@ -91,11 +91,20 @@ static void omap_mcbsp_dump_reg(u8 id)
static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id)
{
struct omap_mcbsp *mcbsp_tx = dev_id;
u16 irqst_spcr2;
dev_dbg(mcbsp_tx->dev, "TX IRQ callback : 0x%x\n",
OMAP_MCBSP_READ(mcbsp_tx->io_base, SPCR2));
irqst_spcr2 = OMAP_MCBSP_READ(mcbsp_tx->io_base, SPCR2);
dev_dbg(mcbsp_tx->dev, "TX IRQ callback : 0x%x\n", irqst_spcr2);
complete(&mcbsp_tx->tx_irq_completion);
if (irqst_spcr2 & XSYNC_ERR) {
dev_err(mcbsp_tx->dev, "TX Frame Sync Error! : 0x%x\n",
irqst_spcr2);
/* Writing zero to XSYNC_ERR clears the IRQ */
OMAP_MCBSP_WRITE(mcbsp_tx->io_base, SPCR2,
irqst_spcr2 & ~(XSYNC_ERR));
} else {
complete(&mcbsp_tx->tx_irq_completion);
}
return IRQ_HANDLED;
}
@ -103,11 +112,20 @@ static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id)
static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *dev_id)
{
struct omap_mcbsp *mcbsp_rx = dev_id;
u16 irqst_spcr1;
dev_dbg(mcbsp_rx->dev, "RX IRQ callback : 0x%x\n",
OMAP_MCBSP_READ(mcbsp_rx->io_base, SPCR2));
irqst_spcr1 = OMAP_MCBSP_READ(mcbsp_rx->io_base, SPCR1);
dev_dbg(mcbsp_rx->dev, "RX IRQ callback : 0x%x\n", irqst_spcr1);
complete(&mcbsp_rx->rx_irq_completion);
if (irqst_spcr1 & RSYNC_ERR) {
dev_err(mcbsp_rx->dev, "RX Frame Sync Error! : 0x%x\n",
irqst_spcr1);
/* Writing zero to RSYNC_ERR clears the IRQ */
OMAP_MCBSP_WRITE(mcbsp_rx->io_base, SPCR1,
irqst_spcr1 & ~(RSYNC_ERR));
} else {
complete(&mcbsp_rx->tx_irq_completion);
}
return IRQ_HANDLED;
}