ASoC: davinci-pcm: trivial: replace link with actual chan/link

The ambiguously named variable 'link' is used as a temporary throughout
davinci-pcm -- its presence makes grepping (and groking) the code
difficult.

Replace link with the value of link in almost all sites. The exception
is a couple places where the last-assigned link/chan needs to be
returned by a function -- in these cases, rename to last_link.

Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/davinci/davinci-pcm.c

@@ -180,7 +180,6 @@ static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
 {
 	struct davinci_runtime_data *prtd = substream->runtime->private_data;
 	struct snd_pcm_runtime *runtime = substream->runtime;
-	int link = prtd->asp_link[0];
 	unsigned int period_size;
 	unsigned int dma_offset;
 	dma_addr_t dma_pos;
@@ -198,7 +197,8 @@ static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
 	fifo_level = prtd->params->fifo_level;
 
 	pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
-		"dma_ptr = %x period_size=%x\n", link, dma_pos, period_size);
+		"dma_ptr = %x period_size=%x\n", prtd->asp_link[0], dma_pos,
+		period_size);
 
 	data_type = prtd->params->data_type;
 	count = period_size / data_type;
@@ -222,17 +222,19 @@ static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
 	}
 
 	acnt = prtd->params->acnt;
-	edma_set_src(link, src, INCR, W8BIT);
-	edma_set_dest(link, dst, INCR, W8BIT);
+	edma_set_src(prtd->asp_link[0], src, INCR, W8BIT);
+	edma_set_dest(prtd->asp_link[0], dst, INCR, W8BIT);
 
-	edma_set_src_index(link, src_bidx, src_cidx);
-	edma_set_dest_index(link, dst_bidx, dst_cidx);
+	edma_set_src_index(prtd->asp_link[0], src_bidx, src_cidx);
+	edma_set_dest_index(prtd->asp_link[0], dst_bidx, dst_cidx);
 
 	if (!fifo_level)
-		edma_set_transfer_params(link, acnt, count, 1, 0, ASYNC);
+		edma_set_transfer_params(prtd->asp_link[0], acnt, count, 1, 0,
+							ASYNC);
 	else
-		edma_set_transfer_params(link, acnt, fifo_level, count,
-							fifo_level, ABSYNC);
+		edma_set_transfer_params(prtd->asp_link[0], acnt, fifo_level,
+							count, fifo_level,
+							ABSYNC);
 }
 
 static void davinci_pcm_dma_irq(unsigned link, u16 ch_status, void *data)
@@ -305,7 +307,6 @@ static int ping_pong_dma_setup(struct snd_pcm_substream *substream)
 	unsigned int acnt = params->acnt;
 	/* divide by 2 for ping/pong */
 	unsigned int ping_size = snd_pcm_lib_period_bytes(substream) >> 1;
-	int link = prtd->asp_link[1];
 	unsigned int fifo_level = prtd->params->fifo_level;
 	unsigned int count;
 	if ((data_type == 0) || (data_type > 4)) {
@@ -316,28 +317,26 @@ static int ping_pong_dma_setup(struct snd_pcm_substream *substream)
 		dma_addr_t asp_src_pong = iram_dma->addr + ping_size;
 		ram_src_cidx = ping_size;
 		ram_dst_cidx = -ping_size;
-		edma_set_src(link, asp_src_pong, INCR, W8BIT);
+		edma_set_src(prtd->asp_link[1], asp_src_pong, INCR, W8BIT);
 
-		link = prtd->asp_link[0];
-		edma_set_src_index(link, data_type, data_type * fifo_level);
-		link = prtd->asp_link[1];
-		edma_set_src_index(link, data_type, data_type * fifo_level);
+		edma_set_src_index(prtd->asp_link[0], data_type,
+				data_type * fifo_level);
+		edma_set_src_index(prtd->asp_link[1], data_type,
+				data_type * fifo_level);
 
-		link = prtd->ram_link;
-		edma_set_src(link, runtime->dma_addr, INCR, W32BIT);
+		edma_set_src(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
 	} else {
 		dma_addr_t asp_dst_pong = iram_dma->addr + ping_size;
 		ram_src_cidx = -ping_size;
 		ram_dst_cidx = ping_size;
-		edma_set_dest(link, asp_dst_pong, INCR, W8BIT);
+		edma_set_dest(prtd->asp_link[1], asp_dst_pong, INCR, W8BIT);
 
-		link = prtd->asp_link[0];
-		edma_set_dest_index(link, data_type, data_type * fifo_level);
-		link = prtd->asp_link[1];
-		edma_set_dest_index(link, data_type, data_type * fifo_level);
+		edma_set_dest_index(prtd->asp_link[0], data_type,
+				data_type * fifo_level);
+		edma_set_dest_index(prtd->asp_link[1], data_type,
+				data_type * fifo_level);
 
-		link = prtd->ram_link;
-		edma_set_dest(link, runtime->dma_addr, INCR, W32BIT);
+		edma_set_dest(prtd->ram_link, runtime->dma_addr, INCR, W32BIT);
 	}
 
 	if (!fifo_level) {
@@ -354,10 +353,9 @@ static int ping_pong_dma_setup(struct snd_pcm_substream *substream)
 				count, fifo_level, ABSYNC);
 	}
 
-	link = prtd->ram_link;
-	edma_set_src_index(link, ping_size, ram_src_cidx);
-	edma_set_dest_index(link, ping_size, ram_dst_cidx);
-	edma_set_transfer_params(link, ping_size, 2,
+	edma_set_src_index(prtd->ram_link, ping_size, ram_src_cidx);
+	edma_set_dest_index(prtd->ram_link, ping_size, ram_dst_cidx);
+	edma_set_transfer_params(prtd->ram_link, ping_size, 2,
 			runtime->periods, 2, ASYNC);
 
 	/* init master params */
@@ -406,32 +404,32 @@ static int request_ping_pong(struct snd_pcm_substream *substream,
 {
 	dma_addr_t asp_src_ping;
 	dma_addr_t asp_dst_ping;
-	int link;
+	int ret;
 	struct davinci_pcm_dma_params *params = prtd->params;
 
 	/* Request ram master channel */
-	link = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY,
+	ret = prtd->ram_channel = edma_alloc_channel(EDMA_CHANNEL_ANY,
 				  davinci_pcm_dma_irq, substream,
 				  prtd->params->ram_chan_q);
-	if (link < 0)
+	if (ret < 0)
 		goto exit1;
 
 	/* Request ram link channel */
-	link = prtd->ram_link = edma_alloc_slot(
+	ret = prtd->ram_link = edma_alloc_slot(
 			EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
-	if (link < 0)
+	if (ret < 0)
 		goto exit2;
 
-	link = prtd->asp_link[1] = edma_alloc_slot(
+	ret = prtd->asp_link[1] = edma_alloc_slot(
 			EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
-	if (link < 0)
+	if (ret < 0)
 		goto exit3;
 
 	prtd->ram_link2 = -1;
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-		link = prtd->ram_link2 = edma_alloc_slot(
+		ret = prtd->ram_link2 = edma_alloc_slot(
 			EDMA_CTLR(prtd->ram_channel), EDMA_SLOT_ANY);
-		if (link < 0)
+		if (ret < 0)
 			goto exit4;
 	}
 	/* circle ping-pong buffers */
@@ -448,36 +446,33 @@ static int request_ping_pong(struct snd_pcm_substream *substream,
 		asp_dst_ping = iram_dma->addr;
 	}
 	/* ping */
-	link = prtd->asp_link[0];
-	edma_set_src(link, asp_src_ping, INCR, W16BIT);
-	edma_set_dest(link, asp_dst_ping, INCR, W16BIT);
-	edma_set_src_index(link, 0, 0);
-	edma_set_dest_index(link, 0, 0);
+	edma_set_src(prtd->asp_link[0], asp_src_ping, INCR, W16BIT);
+	edma_set_dest(prtd->asp_link[0], asp_dst_ping, INCR, W16BIT);
+	edma_set_src_index(prtd->asp_link[0], 0, 0);
+	edma_set_dest_index(prtd->asp_link[0], 0, 0);
 
-	edma_read_slot(link, &prtd->asp_params);
+	edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 	prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f) | TCINTEN);
 	prtd->asp_params.opt |= TCCHEN |
 		EDMA_TCC(prtd->ram_channel & 0x3f);
-	edma_write_slot(link, &prtd->asp_params);
+	edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
 
 	/* pong */
-	link = prtd->asp_link[1];
-	edma_set_src(link, asp_src_ping, INCR, W16BIT);
-	edma_set_dest(link, asp_dst_ping, INCR, W16BIT);
-	edma_set_src_index(link, 0, 0);
-	edma_set_dest_index(link, 0, 0);
+	edma_set_src(prtd->asp_link[1], asp_src_ping, INCR, W16BIT);
+	edma_set_dest(prtd->asp_link[1], asp_dst_ping, INCR, W16BIT);
+	edma_set_src_index(prtd->asp_link[1], 0, 0);
+	edma_set_dest_index(prtd->asp_link[1], 0, 0);
 
-	edma_read_slot(link, &prtd->asp_params);
+	edma_read_slot(prtd->asp_link[1], &prtd->asp_params);
 	prtd->asp_params.opt &= ~(TCCMODE | EDMA_TCC(0x3f));
 	/* interrupt after every pong completion */
 	prtd->asp_params.opt |= TCINTEN | TCCHEN |
 		EDMA_TCC(prtd->ram_channel & 0x3f);
-	edma_write_slot(link, &prtd->asp_params);
+	edma_write_slot(prtd->asp_link[1], &prtd->asp_params);
 
 	/* ram */
-	link = prtd->ram_link;
-	edma_set_src(link, iram_dma->addr, INCR, W32BIT);
-	edma_set_dest(link, iram_dma->addr, INCR, W32BIT);
+	edma_set_src(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
+	edma_set_dest(prtd->ram_link, iram_dma->addr, INCR, W32BIT);
 	pr_debug("%s: audio dma channels/slots in use for ram:%u %u %u,"
 		"for asp:%u %u %u\n", __func__,
 		prtd->ram_channel, prtd->ram_link, prtd->ram_link2,
@@ -494,7 +489,7 @@ exit2:
 	edma_free_channel(prtd->ram_channel);
 	prtd->ram_channel = -1;
 exit1:
-	return link;
+	return ret;
 }
 
 static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
@@ -502,22 +497,22 @@ static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
 	struct snd_dma_buffer *iram_dma;
 	struct davinci_runtime_data *prtd = substream->runtime->private_data;
 	struct davinci_pcm_dma_params *params = prtd->params;
-	int link;
+	int ret;
 
 	if (!params)
 		return -ENODEV;
 
 	/* Request asp master DMA channel */
-	link = prtd->asp_channel = edma_alloc_channel(params->channel,
+	ret = prtd->asp_channel = edma_alloc_channel(params->channel,
 			davinci_pcm_dma_irq, substream,
 			prtd->params->asp_chan_q);
-	if (link < 0)
+	if (ret < 0)
 		goto exit1;
 
 	/* Request asp link channels */
-	link = prtd->asp_link[0] = edma_alloc_slot(
+	ret = prtd->asp_link[0] = edma_alloc_slot(
 			EDMA_CTLR(prtd->asp_channel), EDMA_SLOT_ANY);
-	if (link < 0)
+	if (ret < 0)
 		goto exit2;
 
 	iram_dma = (struct snd_dma_buffer *)substream->dma_buffer.private_data;
@@ -537,17 +532,17 @@ static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
 	 * the buffer and its length (ccnt) ... use it as a template
 	 * so davinci_pcm_enqueue_dma() takes less time in IRQ.
 	 */
-	edma_read_slot(link, &prtd->asp_params);
+	edma_read_slot(prtd->asp_link[0], &prtd->asp_params);
 	prtd->asp_params.opt |= TCINTEN |
 		EDMA_TCC(EDMA_CHAN_SLOT(prtd->asp_channel));
-	prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(link) << 5;
-	edma_write_slot(link, &prtd->asp_params);
+	prtd->asp_params.link_bcntrld = EDMA_CHAN_SLOT(prtd->asp_link[0]) << 5;
+	edma_write_slot(prtd->asp_link[0], &prtd->asp_params);
 	return 0;
 exit2:
 	edma_free_channel(prtd->asp_channel);
 	prtd->asp_channel = -1;
 exit1:
-	return link;
+	return ret;
 }
 
 static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)