38 lines
1.1 KiB
Diff
38 lines
1.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Pardha Saradhi K <pardha.saradhi.kesapragada@intel.com>
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Date: Tue, 17 Oct 2017 23:01:00 +0530
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Subject: [PATCH] ALSA: hda: check if stream is stopped in
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snd_hdac_stream_clear
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Check if the DMA Channel is already stopped. There is no need
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to stop it again if stopped.
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Change-Id: Ia4632675638726b65dc3b9e2aca4f6c36773f757
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Signed-off-by: Pardha Saradhi K <pardha.saradhi.kesapragada@intel.com>
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Reviewed-on:
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Reviewed-by: Koul, Vinod <vinod.koul@intel.com>
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Tested-by: Sm, Bhadur A <bhadur.a.sm@intel.com>
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---
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sound/hda/hdac_stream.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c
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index 0fdb6dd7f316..67d672192606 100644
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--- a/sound/hda/hdac_stream.c
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+++ b/sound/hda/hdac_stream.c
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@@ -91,6 +91,11 @@ void snd_hdac_stream_clear(struct hdac_stream *azx_dev)
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int timeout;
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unsigned char val;
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+ /* check if the DMA is already stopped */
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+ val = snd_hdac_stream_readb(azx_dev, SD_CTL) & SD_CTL_DMA_START;
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+ if (!val)
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+ return;
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+
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snd_hdac_stream_updateb(azx_dev, SD_CTL,
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SD_CTL_DMA_START | SD_INT_MASK, 0);
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--
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https://clearlinux.org
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