This is a note to let you know that I've just added the patch titled
dma: tegra: implement flags parameters for cyclic transfer
to the 3.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dma-tegra-implement-flags-parameters-for-cyclic-transfer.patch
and it can be found in the queue-3.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From b9bb37f5486ba05d2b557dbf1aeb754fef618985 Mon Sep 17 00:00:00 2001
From: Laxman Dewangan <[email protected]>
Date: Wed, 9 Jan 2013 15:26:22 +0530
Subject: dma: tegra: implement flags parameters for cyclic transfer
From: Laxman Dewangan <[email protected]>
commit b9bb37f5486ba05d2b557dbf1aeb754fef618985 upstream.
The flag parameter is added in the cyclic transfer request.
Use the flag option of:
- DMA_PREP_INTERRUPT for enabling interrupt.
- DMA_CTRL_ACK for deciding whether ack is requred or not for
descriptor.
Signed-off-by: Laxman Dewangan <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/dma/tegra20-apb-dma.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -266,6 +266,7 @@ static struct tegra_dma_desc *tegra_dma_
if (async_tx_test_ack(&dma_desc->txd)) {
list_del(&dma_desc->node);
spin_unlock_irqrestore(&tdc->lock, flags);
+ dma_desc->txd.flags = 0;
return dma_desc;
}
}
@@ -1050,7 +1051,9 @@ struct dma_async_tx_descriptor *tegra_dm
TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT;
ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32;
- csr |= TEGRA_APBDMA_CSR_FLOW | TEGRA_APBDMA_CSR_IE_EOC;
+ csr |= TEGRA_APBDMA_CSR_FLOW;
+ if (flags & DMA_PREP_INTERRUPT)
+ csr |= TEGRA_APBDMA_CSR_IE_EOC;
csr |= tdc->dma_sconfig.slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT;
apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1;
@@ -1095,7 +1098,8 @@ struct dma_async_tx_descriptor *tegra_dm
mem += len;
}
sg_req->last_sg = true;
- dma_desc->txd.flags = 0;
+ if (flags & DMA_CTRL_ACK)
+ dma_desc->txd.flags = DMA_CTRL_ACK;
/*
* Make sure that mode should not be conflicting with currently
Patches currently in stable-queue which might be from [email protected] are
queue-3.7/dma-tegra-implement-flags-parameters-for-cyclic-transfer.patch
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