[PATCH] ARM: EDMA: Fix clearing of unused list for DT DMA resources
From: Joel Fernandes <hidden>
Date: 2013-07-22 17:49:55
Also in:
linux-mmc, linux-omap, lkml
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
HWMOD removal for MMC is breaking edma_start as the events are being manually triggered due to unused channel list not being clear, Thanks to Balaji TK for finding this issue. This patch fixes the issue, by reading the "dmas" property from the DT node if it exists and clearing the bits in the unused channel list. Cc: Balaji T K <redacted> Cc: Pantel Antoniou <redacted> Signed-off-by: Joel Fernandes <redacted> --- Fixed pushed to git at github.com:joelagnel/linux-kernel.git 99b65c9..a411a81 master-rebase -> master-rebase arch/arm/common/edma.c | 31 +++++++++++++++++++++++-------- 1 file changed, 23 insertions(+), 8 deletions(-)
diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index a432e6c..720f958 100644
--- a/arch/arm/common/edma.c
+++ b/arch/arm/common/edma.c@@ -561,14 +561,29 @@ static int reserve_contiguous_slots(int ctlr, unsigned int id, static int prepare_unused_channel_list(struct device *dev, void *data) { struct platform_device *pdev = to_platform_device(dev); - int i, ctlr; - - for (i = 0; i < pdev->num_resources; i++) { - if ((pdev->resource[i].flags & IORESOURCE_DMA) && - (int)pdev->resource[i].start >= 0) { - ctlr = EDMA_CTLR(pdev->resource[i].start); - clear_bit(EDMA_CHAN_SLOT(pdev->resource[i].start), - edma_cc[ctlr]->edma_unused); + int i = 0, ctlr; + u32 dma_chan; + __be32 *dma_chan_p; + struct property *prop; + + if (dev->of_node) { + of_property_for_each_u32(dev->of_node, "dmas", prop, \ + dma_chan_p, dma_chan) { + if (i++ & 1) { + ctlr = EDMA_CTLR(dma_chan); + clear_bit(EDMA_CHAN_SLOT(dma_chan), + edma_cc[ctlr]->edma_unused); + } + } + } else { + for (; i < pdev->num_resources; i++) { + if ((pdev->resource[i].flags & IORESOURCE_DMA) && + (int)pdev->resource[i].start >= 0) { + ctlr = EDMA_CTLR(pdev->resource[i].start); + clear_bit(EDMA_CHAN_SLOT( + pdev->resource[i].start), + edma_cc[ctlr]->edma_unused); + } } }
--
1.7.9.5