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List:       dmaengine
Subject:    [PATCH v1 1/2] dmaengine: stm32-mdma: align TLEN and buffer length on burst
From:       Pierre-Yves MORDRET <pierre-yves.mordret () st ! com>
Date:       2018-03-13 17:16:05
Message-ID: 1520961366-27473-2-git-send-email-pierre-yves.mordret () st ! com
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Both buffer Transfer Length (TLEN if any) and transfer size have to be
aligned on burst size (burst beats*bus width).

Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
---
  Version history:
    v1:
       * Initial
---
---
 drivers/dma/stm32-mdma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c
index daa1602..fbcffa2 100644
--- a/drivers/dma/stm32-mdma.c
+++ b/drivers/dma/stm32-mdma.c
@@ -413,7 +413,7 @@ static u32 stm32_mdma_get_best_burst(u32 buf_len, u32 tlen, u32 max_burst,
 	u32 best_burst = max_burst;
 	u32 burst_len = best_burst * width;
 
-	while ((burst_len > 0) && (tlen % burst_len)) {
+	while ((burst_len > 0) && (((tlen | buf_len) & (burst_len - 1)) != 0)) {
 		best_burst = best_burst >> 1;
 		burst_len = best_burst * width;
 	}
-- 
2.7.4

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