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at_hdmac: bugfix for enabling channel irq 

commit 463894705e deleted redundant
chan_id and chancnt initialization in dma drivers as this is done
in dma_async_device_register().

However, atc_enable_irq() relied on chan_id set before registering
the device, what left only channel 0 functional for this driver.

This patch introduces atc_enable/disable_chan_irq() as a variant
of atc_enable/disable_irq() with the channel as explicit argument.

Signed-off-by: Nikolaus Voss <n.voss@weinmann.de>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
This commit is contained in:
Nikolaus Voss 2012-01-17 10:28:33 +01:00 committed by Vinod Koul
parent dcd6c92267
commit bda3a47c88
2 changed files with 10 additions and 11 deletions
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4
drivers/dma/at_hdmac.c
View File

@ -1343,7 +1343,7 @@ static int __init at_dma_probe(struct platform_device *pdev)
tasklet_init(&atchan->tasklet, atc_tasklet,
(unsigned long)atchan);
atc_enable_irq(atchan);
atc_enable_chan_irq(atdma, i);
}
/* set base routines */
@ -1410,7 +1410,7 @@ static int __exit at_dma_remove(struct platform_device *pdev)
struct at_dma_chan *atchan = to_at_dma_chan(chan);
/* Disable interrupts */
atc_disable_irq(atchan);
atc_disable_chan_irq(atdma, chan->chan_id);
tasklet_disable(&atchan->tasklet);
tasklet_kill(&atchan->tasklet);

17
drivers/dma/at_hdmac_regs.h
View File

@ -327,28 +327,27 @@ static void atc_dump_lli(struct at_dma_chan *atchan, struct at_lli *lli)
}
static void atc_setup_irq(struct at_dma_chan *atchan, int on)
static void atc_setup_irq(struct at_dma *atdma, int chan_id, int on)
{
struct at_dma *atdma = to_at_dma(atchan->chan_common.device);
u32 ebci;
u32 ebci;
/* enable interrupts on buffer transfer completion & error */
ebci = AT_DMA_BTC(atchan->chan_common.chan_id)
| AT_DMA_ERR(atchan->chan_common.chan_id);
ebci = AT_DMA_BTC(chan_id)
| AT_DMA_ERR(chan_id);
if (on)
dma_writel(atdma, EBCIER, ebci);
else
dma_writel(atdma, EBCIDR, ebci);
}
static inline void atc_enable_irq(struct at_dma_chan *atchan)
static void atc_enable_chan_irq(struct at_dma *atdma, int chan_id)
{
atc_setup_irq(atchan, 1);
atc_setup_irq(atdma, chan_id, 1);
}
static inline void atc_disable_irq(struct at_dma_chan *atchan)
static void atc_disable_chan_irq(struct at_dma *atdma, int chan_id)
{
atc_setup_irq(atchan, 0);
atc_setup_irq(atdma, chan_id, 0);
}