linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Thomas Breitung <thomas.breitung@izt-labs.de>
To: linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org
Cc: Li Yang <leoli@freescale.com>, Zhang Wei <zw@zh-kernel.org>,
	Vinod Koul <vinod.koul@intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Thomas Breitung <thomas.breitung@izt-labs.de>,
	Wolfgang Ocker <weo@reccoware.de>
Subject: [PATCH] dmaengine: fsldma: set BWC, DAHTS and SAHTS values correctly
Date: Mon, 19 Jun 2017 16:40:04 +0200	[thread overview]
Message-ID: <20170619144004.18224-1-thomas.breitung@izt-labs.de> (raw)

The bits of BWC, DAHTS and SAHTS in the DMA mode register must be cleared
before a new value can be or-ed in.

Signed-off-by: Thomas Breitung <thomas.breitung@izt-labs.de>
Signed-off-by: Wolfgang Ocker <weo@reccoware.de>
---
 drivers/dma/fsldma.c | 5 ++++-
 drivers/dma/fsldma.h | 4 ++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 51c75bf2b9b6..3b8b752ede2d 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -269,6 +269,7 @@ static void fsl_chan_set_src_loop_size(struct fsldma_chan *chan, int size)
 	case 2:
 	case 4:
 	case 8:
+		mode &= ~FSL_DMA_MR_SAHTS_MASK;
 		mode |= FSL_DMA_MR_SAHE | (__ilog2(size) << 14);
 		break;
 	}
@@ -301,6 +302,7 @@ static void fsl_chan_set_dst_loop_size(struct fsldma_chan *chan, int size)
 	case 2:
 	case 4:
 	case 8:
+		mode &= ~FSL_DMA_MR_DAHTS_MASK;
 		mode |= FSL_DMA_MR_DAHE | (__ilog2(size) << 16);
 		break;
 	}
@@ -327,7 +329,8 @@ static void fsl_chan_set_request_count(struct fsldma_chan *chan, int size)
 	BUG_ON(size > 1024);
 
 	mode = get_mr(chan);
-	mode |= (__ilog2(size) << 24) & 0x0f000000;
+	mode &= ~FSL_DMA_MR_BWC_MASK;
+	mode |= (__ilog2(size) << 24) & FSL_DMA_MR_BWC_MASK;
 
 	set_mr(chan, mode);
 }
diff --git a/drivers/dma/fsldma.h b/drivers/dma/fsldma.h
index 31bffccdcc75..4787d485dd76 100644
--- a/drivers/dma/fsldma.h
+++ b/drivers/dma/fsldma.h
@@ -36,6 +36,10 @@
 #define FSL_DMA_MR_DAHE		0x00002000
 #define FSL_DMA_MR_SAHE		0x00001000
 
+#define FSL_DMA_MR_SAHTS_MASK	0x0000C000
+#define FSL_DMA_MR_DAHTS_MASK	0x00030000
+#define FSL_DMA_MR_BWC_MASK	0x0f000000
+
 /*
  * Bandwidth/pause control determines how many bytes a given
  * channel is allowed to transfer before the DMA engine pauses
-- 
2.13.0

             reply	other threads:[~2017-06-19 14:49 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-19 14:40 Thomas Breitung [this message]
2017-06-22 13:01 ` [PATCH] dmaengine: fsldma: set BWC, DAHTS and SAHTS values correctly Vinod Koul

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20170619144004.18224-1-thomas.breitung@izt-labs.de \
    --to=thomas.breitung@izt-labs.de \
    --cc=dan.j.williams@intel.com \
    --cc=dmaengine@vger.kernel.org \
    --cc=leoli@freescale.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=vinod.koul@intel.com \
    --cc=weo@reccoware.de \
    --cc=zw@zh-kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).