From: Jarkko Nikula <jarkko.nikula@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
---
arch/arm/plat-omap/mcbsp.c | 13 +++++++++----
1 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index f27e641..af33fc7 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -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;
--
1.5.6.rc3.21.g8c6b5
--
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