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Commit bda3a47c authored by Nikolaus Voss's avatar Nikolaus Voss Committed by Vinod Koul
Browse files

at_hdmac: bugfix for enabling channel irq 



commit 46389470 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: default avatarNikolaus Voss <n.voss@weinmann.de>
Signed-off-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarVinod Koul <vinod.koul@linux.intel.com>
parent dcd6c922

drivers/dma/at_hdmac.c

+2 −2
Original line number Original line Diff line number Diff line
@@ -1343,7 +1343,7 @@ static int __init at_dma_probe(struct platform_device *pdev) 




		tasklet_init(&atchan->tasklet, atc_tasklet,

		tasklet_init(&atchan->tasklet, atc_tasklet,

				(unsigned long)atchan);

				(unsigned long)atchan);

		atc_enable_irq(atchan);

		atc_enable_chan_irq(atdma, i);

	}

	}





	/* set base routines */

	/* 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);

		struct at_dma_chan	*atchan = to_at_dma_chan(chan);





		/* Disable interrupts */

		/* Disable interrupts */

		atc_disable_irq(atchan);

		atc_disable_chan_irq(atdma, chan->chan_id);

		tasklet_disable(&atchan->tasklet);

		tasklet_disable(&atchan->tasklet);





		tasklet_kill(&atchan->tasklet);

		tasklet_kill(&atchan->tasklet);

drivers/dma/at_hdmac_regs.h

+8 −9
Original line number Original line Diff line number Diff line
@@ -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 */

	/* enable interrupts on buffer transfer completion & error */

	ebci =    AT_DMA_BTC(atchan->chan_common.chan_id)

	ebci =    AT_DMA_BTC(chan_id)

		| AT_DMA_ERR(atchan->chan_common.chan_id);

		| AT_DMA_ERR(chan_id);

	if (on)

	if (on)

		dma_writel(atdma, EBCIER, ebci);

		dma_writel(atdma, EBCIER, ebci);

	else

	else

		dma_writel(atdma, EBCIDR, ebci);

		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);

}

}