Messages in this thread Patch in this message | | | From | Pierre-Yves MORDRET <> | Subject | [PATCH v1 1/2] dmaengine: stm32-mdma: align TLEN and buffer length on burst | Date | Tue, 13 Mar 2018 18:16:05 +0100 |
| |
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
| |