All of lore.kernel.org
 help / color / mirror / Atom feed
From: Marek Szyprowski <m.szyprowski@samsung.com>
To: dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Vinod Koul <vkoul@kernel.org>,
	Sugar Zhang <sugar.zhang@rock-chips.com>,
	lkp@intel.com
Subject: [PATCH] dmaengine: pl330: Fix burst length if burst size is smaller than bus width
Date: Tue, 25 Aug 2020 08:46:17 +0200	[thread overview]
Message-ID: <20200825064617.16193-1-m.szyprowski@samsung.com> (raw)
In-Reply-To: CGME20200825064623eucas1p2d8ba8813794fe18ddd246b9a4789ed93@eucas1p2.samsung.com

Move the burst len fixup after setting the generic value for it. This
finally enables the fixup introduced by commit 137bd11090d8 ("dmaengine:
pl330: Align DMA memcpy operations to MFIFO width"), which otherwise was
overwritten by the generic value.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: 137bd11090d8 ("dmaengine: pl330: Align DMA memcpy operations to MFIFO width")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 drivers/dma/pl330.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 2c508ee672b9..e010064d8846 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2801,6 +2801,7 @@ pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
 	while (burst != (1 << desc->rqcfg.brst_size))
 		desc->rqcfg.brst_size++;
 
+	desc->rqcfg.brst_len = get_burst_len(desc, len);
 	/*
 	 * If burst size is smaller than bus width then make sure we only
 	 * transfer one at a time to avoid a burst stradling an MFIFO entry.
@@ -2808,7 +2809,6 @@ pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
 	if (desc->rqcfg.brst_size * 8 < pl330->pcfg.data_bus_width)
 		desc->rqcfg.brst_len = 1;
 
-	desc->rqcfg.brst_len = get_burst_len(desc, len);
 	desc->bytes_requested = len;
 
 	desc->txd.flags = flags;
-- 
2.17.1


WARNING: multiple messages have this Message-ID (diff)
From: Marek Szyprowski <m.szyprowski@samsung.com>
To: dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Cc: Sugar Zhang <sugar.zhang@rock-chips.com>,
	Vinod Koul <vkoul@kernel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	lkp@intel.com, Marek Szyprowski <m.szyprowski@samsung.com>
Subject: [PATCH] dmaengine: pl330: Fix burst length if burst size is smaller than bus width
Date: Tue, 25 Aug 2020 08:46:17 +0200	[thread overview]
Message-ID: <20200825064617.16193-1-m.szyprowski@samsung.com> (raw)
In-Reply-To: CGME20200825064623eucas1p2d8ba8813794fe18ddd246b9a4789ed93@eucas1p2.samsung.com

Move the burst len fixup after setting the generic value for it. This
finally enables the fixup introduced by commit 137bd11090d8 ("dmaengine:
pl330: Align DMA memcpy operations to MFIFO width"), which otherwise was
overwritten by the generic value.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: 137bd11090d8 ("dmaengine: pl330: Align DMA memcpy operations to MFIFO width")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 drivers/dma/pl330.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 2c508ee672b9..e010064d8846 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2801,6 +2801,7 @@ pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
 	while (burst != (1 << desc->rqcfg.brst_size))
 		desc->rqcfg.brst_size++;
 
+	desc->rqcfg.brst_len = get_burst_len(desc, len);
 	/*
 	 * If burst size is smaller than bus width then make sure we only
 	 * transfer one at a time to avoid a burst stradling an MFIFO entry.
@@ -2808,7 +2809,6 @@ pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
 	if (desc->rqcfg.brst_size * 8 < pl330->pcfg.data_bus_width)
 		desc->rqcfg.brst_len = 1;
 
-	desc->rqcfg.brst_len = get_burst_len(desc, len);
 	desc->bytes_requested = len;
 
 	desc->txd.flags = flags;
-- 
2.17.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

       reply	other threads:[~2020-08-25  6:46 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20200825064623eucas1p2d8ba8813794fe18ddd246b9a4789ed93@eucas1p2.samsung.com>
2020-08-25  6:46 ` Marek Szyprowski [this message]
2020-08-25  6:46   ` [PATCH] dmaengine: pl330: Fix burst length if burst size is smaller than bus width Marek Szyprowski
2020-08-25 10:19   ` Vinod Koul
2020-08-25 10:19     ` 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=20200825064617.16193-1-m.szyprowski@samsung.com \
    --to=m.szyprowski@samsung.com \
    --cc=b.zolnierkie@samsung.com \
    --cc=dmaengine@vger.kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=lkp@intel.com \
    --cc=sugar.zhang@rock-chips.com \
    --cc=vkoul@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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.