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Groups > linux.kernel > #1443423

[PATCH 4/7] dmaengine: omap-dma: Dynamically allocate memory for lch_map

From Peter Ujfalusi <peter.ujfalusi@ti.com>
Newsgroups linux.kernel
Subject [PATCH 4/7] dmaengine: omap-dma: Dynamically allocate memory for lch_map
Date 2016-07-14 14:50 +0200
Message-ID <rUOfw-1kh-33@gated-at.bofh.it> (permalink)
References <rUOfv-1kh-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On OMAP1 platforms we do not have 32 channels available. Allocate the
lch_map based on the available channels. This way we are not going to have
more visible channels then it is available on the platform.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
 drivers/dma/omap-dma.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 6d134252ed61..c026642fc66a 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -35,7 +35,7 @@ struct omap_dmadev {
 	unsigned dma_requests;
 	spinlock_t irq_lock;
 	uint32_t irq_enable_mask;
-	struct omap_chan *lch_map[OMAP_SDMA_CHANNELS];
+	struct omap_chan **lch_map;
 };
 
 struct omap_chan {
@@ -1223,16 +1223,24 @@ static int omap_dma_probe(struct platform_device *pdev)
 	spin_lock_init(&od->lock);
 	spin_lock_init(&od->irq_lock);
 
-	od->dma_requests = OMAP_SDMA_REQUESTS;
-	if (pdev->dev.of_node && of_property_read_u32(pdev->dev.of_node,
-						      "dma-requests",
-						      &od->dma_requests)) {
+	if (!pdev->dev.of_node) {
+		od->dma_requests = od->plat->dma_attr->lch_count;
+		if (unlikely(!od->dma_requests))
+			od->dma_requests = OMAP_SDMA_REQUESTS;
+	} else if (of_property_read_u32(pdev->dev.of_node, "dma-requests",
+					&od->dma_requests)) {
 		dev_info(&pdev->dev,
 			 "Missing dma-requests property, using %u.\n",
 			 OMAP_SDMA_REQUESTS);
+		od->dma_requests = OMAP_SDMA_REQUESTS;
 	}
 
-	for (i = 0; i < OMAP_SDMA_CHANNELS; i++) {
+	od->lch_map = devm_kcalloc(&pdev->dev, od->dma_requests,
+				   sizeof(*od->lch_map), GFP_KERNEL);
+	if (!od->lch_map)
+		return -ENOMEM;
+
+	for (i = 0; i < od->dma_requests; i++) {
 		rc = omap_dma_chan_init(od);
 		if (rc) {
 			omap_dma_free(od);
-- 
2.9.1

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Thread

[PATCH 0/7] dmaengine:omap-dma: Linked List transfer for slave_sg Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-14 14:50 +0200
  [PATCH 1/7] dmaengine: omap-dma: Simplify omap_dma_start_sg parameter list Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-14 14:50 +0200
  [PATCH 7/7] dmaengine: omap-dma: Support for LinkedList transfer of slave_sg Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-14 14:50 +0200
    Re: [PATCH 7/7] dmaengine: omap-dma: Support for LinkedList transfer  of slave_sg Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-18 12:50 +0200
      Re: [PATCH 7/7] dmaengine: omap-dma: Support for LinkedList transfer  of slave_sg Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-18 13:20 +0200
  [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on transfer completion Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-14 14:50 +0200
    Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-18 12:40 +0200
      Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-19 14:40 +0200
        Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-19 18:30 +0200
          Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-19 21:30 +0200
          Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Vinod Koul <vinod.koul@intel.com> - 2016-07-24 09:40 +0200
        Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on transfer completion Robert Jarzmik <robert.jarzmik@free.fr> - 2016-07-20 08:30 +0200
          Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-21 11:40 +0200
          Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-21 11:40 +0200
            Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-21 11:50 +0200
              Re: [PATCH 2/7] dmaengine: omap-dma: Complete the cookie first on  transfer completion Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-22 13:10 +0200
  [PATCH 4/7] dmaengine: omap-dma: Dynamically allocate memory for lch_map Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-14 14:50 +0200
  [PATCH 6/7] dmaengine: omap-dma: Use pointer to omap_sg in slave_sg setup's loop Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-14 14:50 +0200
  Re: [PATCH 0/7] dmaengine:omap-dma: Linked List transfer for slave_sg Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-18 12:40 +0200
    Re: [PATCH 0/7] dmaengine:omap-dma: Linked List transfer for slave_sg Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-18 14:10 +0200
      Re: [PATCH 0/7] dmaengine:omap-dma: Linked List transfer for slave_sg Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-18 14:30 +0200
        Re: [PATCH 0/7] dmaengine:omap-dma: Linked List transfer for slave_sg Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-07-18 14:40 +0200

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