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ARM: OMAP: Fixes to omap_mcbsp_request function

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Bootloader may let McBSP logic running so make sure that block is idle
before requesting IRQs. Also make sure that TX and RX waitqueues are
initialized before request_irq.

Signed-off-by: Jarkko Nikula <jarkko.nikula@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Jarkko Nikula 2008-10-08 10:01:41 +03:00 committed by Tony Lindgren
parent 05228c35c6
commit 5a07055a38
1 changed files with 9 additions and 4 deletions
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13
arch/arm/plat-omap/mcbsp.c
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@ -234,8 +234,16 @@ int omap_mcbsp_request(unsigned int id)
mcbsp->free = 0;
spin_unlock(&mcbsp->lock);
/*
* Make sure that transmitter, receiver and sample-rate generator are
* not running before activating IRQs.
*/
OMAP_MCBSP_WRITE(mcbsp->io_base, SPCR1, 0);
OMAP_MCBSP_WRITE(mcbsp->io_base, SPCR2, 0);
if (mcbsp->io_type == OMAP_MCBSP_IRQ_IO) {
/* We need to get IRQs here */
init_completion(&mcbsp->tx_irq_completion);
err = request_irq(mcbsp->tx_irq, omap_mcbsp_tx_irq_handler,
0, "McBSP", (void *)mcbsp);
if (err != 0) {
@ -245,8 +253,7 @@ int omap_mcbsp_request(unsigned int id)
return err;
}
init_completion(&mcbsp->tx_irq_completion);
init_completion(&mcbsp->rx_irq_completion);
err = request_irq(mcbsp->rx_irq, omap_mcbsp_rx_irq_handler,
0, "McBSP", (void *)mcbsp);
if (err != 0) {
@ -256,8 +263,6 @@ int omap_mcbsp_request(unsigned int id)
free_irq(mcbsp->tx_irq, (void *)mcbsp);
return err;
}
init_completion(&mcbsp->rx_irq_completion);
}
return 0;