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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
Message-Id: <20200825064617.16193-1-m.szyprowski@samsung.com>
Content-Type: text/plain; charset="utf-8"
CMS-TYPE: 201P
References: <CGME20200825064623eucas1p2d8ba8813794fe18ddd246b9a4789ed93@eucas1p2.samsung.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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