linux-kernel - [RFC 3/6] dmaengine: xilinx_dma: Increase AXI DMA transaction segment count

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Message-ID: <1522665546-10035-4-git-send-email-radheys@xilinx.com>
Date:   Mon, 2 Apr 2018 16:09:03 +0530
From:   Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
To:     <vinod.koul@...el.com>, <dan.j.williams@...el.com>,
        <michal.simek@...inx.com>, <appana.durga.rao@...inx.com>,
        <radheys@...inx.com>, <lars@...afoo.de>
CC:     <dmaengine@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [RFC 3/6] dmaengine: xilinx_dma: Increase AXI DMA transaction segment count

Increase AXI DMA transaction segments count to ensure that even in
high load we always get a free segment in prepare descriptor for a
DMA_SLAVE transaction.

Signed-off-by: Radhey Shyam Pandey <radheys@...inx.com>
---
 drivers/dma/xilinx/xilinx_dma.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index 16fee30..36e1ab9 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -165,7 +165,7 @@
 #define XILINX_DMA_BD_SOP		BIT(27)
 #define XILINX_DMA_BD_EOP		BIT(26)
 #define XILINX_DMA_COALESCE_MAX		255
-#define XILINX_DMA_NUM_DESCS		255
+#define XILINX_DMA_NUM_DESCS		512
 #define XILINX_DMA_NUM_APP_WORDS	5
 
 /* Multi-Channel DMA Descriptor offsets*/
-- 
1.7.1