linux-kernel - Re: [PATCH 03/32 v2] dmaengine: ste_dma40: Use the BIT macro to replace ugly '(1 << x)'s

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Message-ID: <20130422101332.GQ24632@intel.com>
Date:	Mon, 22 Apr 2013 15:43:32 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	arnd@...db.de, linus.walleij@...ricsson.com,
	Dan Williams <djbw@...com>,
	Per Forlin <per.forlin@...ricsson.com>,
	Rabin Vincent <rabin@....in>
Subject: Re: [PATCH 03/32 v2] dmaengine: ste_dma40: Use the BIT macro to
 replace ugly '(1 << x)'s

On Thu, Apr 18, 2013 at 01:16:37PM +0100, Lee Jones wrote:
> The aim is to make the code that little more readable.
> 
> Cc: Vinod Koul <vinod.koul@...el.com>
> Cc: Dan Williams <djbw@...com>
> Cc: Per Forlin <per.forlin@...ricsson.com>
> Cc: Rabin Vincent <rabin@....in>
> Acked-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
Acked-by: Vinod Koul <vinod.koul@...el.com>

--
~Vinod
> 
> diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
> index 3b83dee..ddf5ff1 100644
> --- a/drivers/dma/ste_dma40.c
> +++ b/drivers/dma/ste_dma40.c
> @@ -49,9 +49,9 @@
>  #define MAX_LCLA_ALLOC_ATTEMPTS 256
>  
>  /* Bit markings for allocation map */
> -#define D40_ALLOC_FREE		(1 << 31)
> -#define D40_ALLOC_PHY		(1 << 30)
> -#define D40_ALLOC_LOG_FREE	0
> +#define D40_ALLOC_FREE		BIT(31)
> +#define D40_ALLOC_PHY		BIT(30)
> +#define D40_ALLOC_LOG_FREE	BIT(0)
>  
>  #define MAX(a, b) (((a) < (b)) ? (b) : (a))
>  
> @@ -993,12 +993,12 @@ static int d40_size_2_dmalen(int size, u32 data_width1, u32 data_width2)
>  	int dmalen;
>  	u32 max_w = max(data_width1, data_width2);
>  	u32 min_w = min(data_width1, data_width2);
> -	u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE << min_w, 1 << max_w);
> +	u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE << min_w, BIT(max_w));
>  
>  	if (seg_max > STEDMA40_MAX_SEG_SIZE)
> -		seg_max -= (1 << max_w);
> +		seg_max -= BIT(max_w);
>  
> -	if (!IS_ALIGNED(size, 1 << max_w))
> +	if (!IS_ALIGNED(size, BIT(max_w)))
>  		return -EINVAL;
>  
>  	if (size <= seg_max)
> @@ -1448,7 +1448,7 @@ static u32 d40_residue(struct d40_chan *d40c)
>  			  >> D40_SREG_ELEM_PHY_ECNT_POS;
>  	}
>  
> -	return num_elt * (1 << d40c->dma_cfg.dst_info.data_width);
> +	return num_elt << d40c->dma_cfg.dst_info.data_width;
>  }
>  
>  static bool d40_tx_is_linked(struct d40_chan *d40c)
> @@ -1722,7 +1722,7 @@ static irqreturn_t d40_handle_interrupt(int irq, void *data)
>  		}
>  
>  		/* ACK interrupt */
> -		writel(1 << idx, base->virtbase + il[row].clr);
> +		writel(BIT(idx), base->virtbase + il[row].clr);
>  
>  		spin_lock(&d40c->lock);
>  
> @@ -1804,9 +1804,9 @@ static int d40_validate_conf(struct d40_chan *d40c,
>  	}
>  
>  	if (d40_psize_2_burst_size(is_log, conf->src_info.psize) *
> -	    (1 << conf->src_info.data_width) !=
> +	    BIT(conf->src_info.data_width) !=
>  	    d40_psize_2_burst_size(is_log, conf->dst_info.psize) *
> -	    (1 << conf->dst_info.data_width)) {
> +	    BIT(conf->dst_info.data_width)) {
>  		/*
>  		 * The DMAC hardware only supports
>  		 * src (burst x width) == dst (burst x width)
> @@ -1848,8 +1848,8 @@ static bool d40_alloc_mask_set(struct d40_phy_res *phy,
>  		if (phy->allocated_src == D40_ALLOC_FREE)
>  			phy->allocated_src = D40_ALLOC_LOG_FREE;
>  
> -		if (!(phy->allocated_src & (1 << log_event_line))) {
> -			phy->allocated_src |= 1 << log_event_line;
> +		if (!(phy->allocated_src & BIT(log_event_line))) {
> +			phy->allocated_src |= BIT(log_event_line);
>  			goto found;
>  		} else
>  			goto not_found;
> @@ -1860,8 +1860,8 @@ static bool d40_alloc_mask_set(struct d40_phy_res *phy,
>  		if (phy->allocated_dst == D40_ALLOC_FREE)
>  			phy->allocated_dst = D40_ALLOC_LOG_FREE;
>  
> -		if (!(phy->allocated_dst & (1 << log_event_line))) {
> -			phy->allocated_dst |= 1 << log_event_line;
> +		if (!(phy->allocated_dst & BIT(log_event_line))) {
> +			phy->allocated_dst |= BIT(log_event_line);
>  			goto found;
>  		} else
>  			goto not_found;
> @@ -1891,11 +1891,11 @@ static bool d40_alloc_mask_free(struct d40_phy_res *phy, bool is_src,
>  
>  	/* Logical channel */
>  	if (is_src) {
> -		phy->allocated_src &= ~(1 << log_event_line);
> +		phy->allocated_src &= ~BIT(log_event_line);
>  		if (phy->allocated_src == D40_ALLOC_LOG_FREE)
>  			phy->allocated_src = D40_ALLOC_FREE;
>  	} else {
> -		phy->allocated_dst &= ~(1 << log_event_line);
> +		phy->allocated_dst &= ~BIT(log_event_line);
>  		if (phy->allocated_dst == D40_ALLOC_LOG_FREE)
>  			phy->allocated_dst = D40_ALLOC_FREE;
>  	}
> @@ -2394,7 +2394,7 @@ static void __d40_set_prio_rt(struct d40_chan *d40c, int dev_type, bool src)
>  	u32 rtreg;
>  	u32 event = D40_TYPE_TO_EVENT(dev_type);
>  	u32 group = D40_TYPE_TO_GROUP(dev_type);
> -	u32 bit = 1 << event;
> +	u32 bit = BIT(event);
>  	u32 prioreg;
>  	struct d40_gen_dmac *dmac = &d40c->base->gen_dmac;
--
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