linux-kernel - Re: [PATCH V2 3/3] dmaengine: at_hdmac: add wrappers for testing channel state

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Message-ID: <4E36B5C2.6050305@atmel.com>
Date:	Mon, 01 Aug 2011 15:18:42 +0100
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
CC:	vinod.koul@...el.com, dan.j.williams@...el.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 3/3] dmaengine: at_hdmac: add wrappers for testing
 channel state

On 07/27/2011 01:21 PM, Nicolas Ferre wrote:
> Cyclic property and paused state are encoded as bits in the channel status
> bitfield. Tests of those bits are wrapped in convenient helper functions.
>
> Signed-off-by: Nicolas Ferre<nicolas.ferre@...el.com>
> ---
> V2: match V2 2/3 patch indentation fixing

Vinod, any news on this V2 series?

Thanks, bye,


>   drivers/dma/at_hdmac.c      |   19 +++++++++----------
>   drivers/dma/at_hdmac_regs.h |   17 +++++++++++++++++
>   2 files changed, 26 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
> index 99bd2c18..26a1196 100644
> --- a/drivers/dma/at_hdmac.c
> +++ b/drivers/dma/at_hdmac.c
> @@ -301,7 +301,7 @@ atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc)
>
>   	/* for cyclic transfers,
>   	 * no need to replay callback function while stopping */
> -	if (!test_bit(ATC_IS_CYCLIC,&atchan->status)) {
> +	if (!atc_chan_is_cyclic(atchan)) {
>   		dma_async_tx_callback	callback = txd->callback;
>   		void			*param = txd->callback_param;
>
> @@ -478,7 +478,7 @@ static void atc_tasklet(unsigned long data)
>   	spin_lock_irqsave(&atchan->lock, flags);
>   	if (test_and_clear_bit(ATC_IS_ERROR,&atchan->status))
>   		atc_handle_error(atchan);
> -	else if (test_bit(ATC_IS_CYCLIC,&atchan->status))
> +	else if (atc_chan_is_cyclic(atchan))
>   		atc_handle_cyclic(atchan);
>   	else
>   		atc_advance_work(atchan);
> @@ -945,7 +945,7 @@ static int atc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
>
>   		spin_unlock_irqrestore(&atchan->lock, flags);
>   	} else if (cmd == DMA_RESUME) {
> -		if (!test_bit(ATC_IS_PAUSED,&atchan->status))
> +		if (!atc_chan_is_paused(atchan))
>   			return 0;
>
>   		spin_lock_irqsave(&atchan->lock, flags);
> @@ -1035,7 +1035,7 @@ atc_tx_status(struct dma_chan *chan,
>   	else
>   		dma_set_tx_state(txstate, last_complete, last_used, 0);
>
> -	if (test_bit(ATC_IS_PAUSED,&atchan->status))
> +	if (atc_chan_is_paused(atchan))
>   		ret = DMA_PAUSED;
>
>   	dev_vdbg(chan2dev(chan), "tx_status %d: cookie = %d (d%d, u%d)\n",
> @@ -1057,7 +1057,7 @@ static void atc_issue_pending(struct dma_chan *chan)
>   	dev_vdbg(chan2dev(chan), "issue_pending\n");
>
>   	/* Not needed for cyclic transfers */
> -	if (test_bit(ATC_IS_CYCLIC,&atchan->status))
> +	if (atc_chan_is_cyclic(atchan))
>   		return;
>
>   	spin_lock_irqsave(&atchan->lock, flags);
> @@ -1395,8 +1395,7 @@ static int at_dma_prepare(struct device *dev)
>   			device_node) {
>   		struct at_dma_chan *atchan = to_at_dma_chan(chan);
>   		/* wait for transaction completion (except in cyclic case) */
> -		if (atc_chan_is_enabled(atchan)&&
> -		   !test_bit(ATC_IS_CYCLIC,&atchan->status))
> +		if (atc_chan_is_enabled(atchan)&&  !atc_chan_is_cyclic(atchan))
>   			return -EAGAIN;
>   	}
>   	return 0;
> @@ -1408,7 +1407,7 @@ static void atc_suspend_cyclic(struct at_dma_chan *atchan)
>
>   	/* Channel should be paused by user
>   	 * do it anyway even if it is not done already */
> -	if (!test_bit(ATC_IS_PAUSED,&atchan->status)) {
> +	if (!atc_chan_is_paused(atchan)) {
>   		dev_warn(chan2dev(chan),
>   		"cyclic channel not paused, should be done by channel user\n");
>   		atc_control(chan, DMA_PAUSE, 0);
> @@ -1432,7 +1431,7 @@ static int at_dma_suspend_noirq(struct device *dev)
>   			device_node) {
>   		struct at_dma_chan *atchan = to_at_dma_chan(chan);
>
> -		if (test_bit(ATC_IS_CYCLIC,&atchan->status))
> +		if (atc_chan_is_cyclic(atchan))
>   			atc_suspend_cyclic(atchan);
>   		atchan->save_cfg = channel_readl(atchan, CFG);
>   	}
> @@ -1484,7 +1483,7 @@ static int at_dma_resume_noirq(struct device *dev)
>   		struct at_dma_chan *atchan = to_at_dma_chan(chan);
>
>   		channel_writel(atchan, CFG, atchan->save_cfg);
> -		if (test_bit(ATC_IS_CYCLIC,&atchan->status))
> +		if (atc_chan_is_cyclic(atchan))
>   			atc_resume_cyclic(atchan);
>   	}
>   	return 0;
> diff --git a/drivers/dma/at_hdmac_regs.h b/drivers/dma/at_hdmac_regs.h
> index 6f0c4a3..aa4c9ae 100644
> --- a/drivers/dma/at_hdmac_regs.h
> +++ b/drivers/dma/at_hdmac_regs.h
> @@ -362,6 +362,23 @@ static inline int atc_chan_is_enabled(struct at_dma_chan *atchan)
>   	return !!(dma_readl(atdma, CHSR)&  atchan->mask);
>   }
>
> +/**
> + * atc_chan_is_paused - test channel pause/resume status
> + * @atchan: channel we want to test status
> + */
> +static inline int atc_chan_is_paused(struct at_dma_chan *atchan)
> +{
> +	return test_bit(ATC_IS_PAUSED,&atchan->status);
> +}
> +
> +/**
> + * atc_chan_is_cyclic - test if given channel has cyclic property set
> + * @atchan: channel we want to test status
> + */
> +static inline int atc_chan_is_cyclic(struct at_dma_chan *atchan)
> +{
> +	return test_bit(ATC_IS_CYCLIC,&atchan->status);
> +}
>
>   /**
>    * set_desc_eol - set end-of-link to descriptor so it will end transfer

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