linux-kernel - [PATCH v2 23/23] dmaengine: edma: Read channel mapping support only once from HW

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Message-ID: <1441974442-8233-24-git-send-email-peter.ujfalusi@ti.com>
Date:	Fri, 11 Sep 2015 15:27:22 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	<vinod.koul@...el.com>, <nsekhar@...com>, <linux@....linux.org.uk>
CC:	<olof@...om.net>, <arnd@...db.de>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<dmaengine@...r.kernel.org>
Subject: [PATCH v2 23/23] dmaengine: edma: Read channel mapping support only once from HW

Instead of directly reading it from CCCFG register take the information out
once when we set up the configuration from the HW.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 drivers/dma/edma.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 5fd5cf924daf..bcb3404058cf 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -223,6 +223,7 @@ struct edma_cc {
 	unsigned			num_region;
 	unsigned			num_slots;
 	unsigned			num_tc;
+	bool				chmap_exist;
 	enum dma_event_q 		default_queue;
 
 	bool				unused_chan_list_done;
@@ -1904,11 +1905,14 @@ static int edma_setup_from_hw(struct device *dev, struct edma_soc_info *pdata,
 	value = GET_NUM_EVQUE(cccfg);
 	ecc->num_tc = value + 1;
 
+	ecc->chmap_exist = (cccfg & CHMAP_EXIST) ? true : false;
+
 	dev_dbg(dev, "eDMA3 CC HW configuration (cccfg: 0x%08x):\n", cccfg);
 	dev_dbg(dev, "num_region: %u\n", ecc->num_region);
 	dev_dbg(dev, "num_channels: %u\n", ecc->num_channels);
 	dev_dbg(dev, "num_slots: %u\n", ecc->num_slots);
 	dev_dbg(dev, "num_tc: %u\n", ecc->num_tc);
+	dev_dbg(dev, "chmap_exist: %s\n", ecc->chmap_exist ? "yes" : "no");
 
 	/* Nothing need to be done if queue priority is provided */
 	if (pdata->queue_priority_mapping)
@@ -2198,7 +2202,7 @@ static int edma_probe(struct platform_device *pdev)
 					      queue_priority_mapping[i][1]);
 
 	/* Map the channel to param entry if channel mapping logic exist */
-	if (edma_read(ecc, EDMA_CCCFG) & CHMAP_EXIST)
+	if (ecc->chmap_exist)
 		edma_direct_dmach_to_param_mapping(ecc);
 
 	for (i = 0; i < ecc->num_region; i++) {
@@ -2268,7 +2272,7 @@ static int edma_pm_resume(struct device *dev)
 					      queue_priority_mapping[i][1]);
 
 	/* Map the channel to param entry if channel mapping logic */
-	if (edma_read(ecc, EDMA_CCCFG) & CHMAP_EXIST)
+	if (ecc->chmap_exist)
 		edma_direct_dmach_to_param_mapping(ecc);
 
 	for (i = 0; i < ecc->num_channels; i++) {
-- 
2.5.1

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