diff mbox

[v3] ARM: EDMA: Fix clearing of unused list for DT DMA resources

Message ID 1378839171-14455-1-git-send-email-joelf@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Joel Fernandes Sept. 10, 2013, 6:52 p.m. UTC 
HWMOD removal for MMC is breaking edma_start as the events are being manually
triggered due to unused channel list not being clear.

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. For this purpose
we use the of_* helpers to parse the arguments in the dmas phandle list.

Reviewed-by: Sekhar Nori <nsekhar@ti.com>
Reported-by: Balaji T K <balajitk@ti.com>
Cc: Pantel Antoniou <panto@antoniou-consulting.com>
Signed-off-by: Joel Fernandes <joelf@ti.com>
---
This patch is a repost of v2 with minor change of return value.

As such this patch fixes DMA breakages on all dependent peripherals (DMA, AES,
MMC, McASP..) so should go in for -rc cycle.

 arch/arm/common/edma.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

Comments

Sekhar Nori Sept. 12, 2013, 9:58 a.m. UTC | #1 
On Wednesday 11 September 2013 12:22 AM, Joel Fernandes wrote:
> HWMOD removal for MMC is breaking edma_start as the events are being manually
> triggered due to unused channel list not being clear.
> 
> 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. For this purpose
> we use the of_* helpers to parse the arguments in the dmas phandle list.
> 
> Reviewed-by: Sekhar Nori <nsekhar@ti.com>
> Reported-by: Balaji T K <balajitk@ti.com>
> Cc: Pantel Antoniou <panto@antoniou-consulting.com>
> Signed-off-by: Joel Fernandes <joelf@ti.com>
> ---
> This patch is a repost of v2 with minor change of return value.

Is this patch meant for merging? If yes, I see no resolution of the
comments given in this thread:

https://lkml.org/lkml/2013/7/30/9

It is better to send one version with all comments fixed. Helps avoid
confusion.

Thanks,
Sekhar
diff mbox

Patch

diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index 117f955..88ea067 100644
--- a/arch/arm/common/edma.c
+++ b/arch/arm/common/edma.c
@@ -560,14 +560,30 @@  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;
+	int i = 0, ctlr;
+	u32 dma_chan;
+	const __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);
+			}
+		}
+		return 0;
+	}
 
-	for (i = 0; i < pdev->num_resources; i++) {
+	/* For non-OF case */
+	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);
+				  edma_cc[ctlr]->edma_unused);
 		}
 	}