[PATCH 1/1] dmaengine: fsl-edma: correct max_segment_size setting

[PATCH 1/1] dmaengine: fsl-edma: correct max_segment_size setting

[Frank Li]

Correcting the previous setting of 0x3fff to the actual value of 0x7fff.

Introduced new macro 'EDMA_TCD_ITER_MASK' for improved code clarity and
utilization of FIELD_GET to obtain the accurate maximum value.

Cc: stable@vger.kernel.org
Fixes: e06748539432 ("dmaengine: fsl-edma: support edma memcpy")
Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
 drivers/dma/fsl-edma-common.h | 5 +++--
 drivers/dma/fsl-edma-main.c   | 4 +++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h
index a05a1f283ece2..7bf0aba471a8c 100644
--- a/drivers/dma/fsl-edma-common.h
+++ b/drivers/dma/fsl-edma-common.h
@@ -30,8 +30,9 @@
 #define EDMA_TCD_ATTR_SSIZE(x)		(((x) & GENMASK(2, 0)) << 8)
 #define EDMA_TCD_ATTR_SMOD(x)		(((x) & GENMASK(4, 0)) << 11)
 
-#define EDMA_TCD_CITER_CITER(x)		((x) & GENMASK(14, 0))
-#define EDMA_TCD_BITER_BITER(x)		((x) & GENMASK(14, 0))
+#define EDMA_TCD_ITER_MASK		GENMASK(14, 0)
+#define EDMA_TCD_CITER_CITER(x)		((x) & EDMA_TCD_ITER_MASK)
+#define EDMA_TCD_BITER_BITER(x)		((x) & EDMA_TCD_ITER_MASK)
 
 #define EDMA_TCD_CSR_START		BIT(0)
 #define EDMA_TCD_CSR_INT_MAJOR		BIT(1)
diff --git a/drivers/dma/fsl-edma-main.c b/drivers/dma/fsl-edma-main.c
index c2c0c3effc8cb..fa8b1e6f57859 100644
--- a/drivers/dma/fsl-edma-main.c
+++ b/drivers/dma/fsl-edma-main.c
@@ -10,6 +10,7 @@
  */
 
 #include <dt-bindings/dma/fsl-edma.h>
+#include <linux/bitfield.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/clk.h>
@@ -600,7 +601,8 @@ static int fsl_edma_probe(struct platform_device *pdev)
 					DMAENGINE_ALIGN_32_BYTES;
 
 	/* Per worst case 'nbytes = 1' take CITER as the max_seg_size */
-	dma_set_max_seg_size(fsl_edma->dma_dev.dev, 0x3fff);
+	dma_set_max_seg_size(fsl_edma->dma_dev.dev,
+			     FIELD_GET(EDMA_TCD_ITER_MASK, EDMA_TCD_ITER_MASK));
 
 	fsl_edma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
 
-- 
2.34.1

Re: [PATCH 1/1] dmaengine: fsl-edma: correct max_segment_size setting

[Vinod Koul]

On Wed, 07 Feb 2024 14:47:32 -0500, Frank Li wrote:
> Correcting the previous setting of 0x3fff to the actual value of 0x7fff.
> 
> Introduced new macro 'EDMA_TCD_ITER_MASK' for improved code clarity and
> utilization of FIELD_GET to obtain the accurate maximum value.
> 
> 

Applied, thanks!

[1/1] dmaengine: fsl-edma: correct max_segment_size setting
      commit: a79f949a5ce1d45329d63742c2a995f2b47f9852

Best regards,
-- 
~Vinod