lkml.org 
[lkml]   [2021]   [Nov]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH AUTOSEL 4.4 04/30] MIPS: lantiq: dma: add small delay after reset
Date
From: Aleksander Jan Bajkowski <olek2@wp.pl>

[ Upstream commit c12aa581f6d5e80c3c3675ab26a52c2b3b62f76e ]

Reading the DMA registers immediately after the reset causes
Data Bus Error. Adding a small delay fixes this issue.

Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/mips/lantiq/xway/dma.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/arch/mips/lantiq/xway/dma.c b/arch/mips/lantiq/xway/dma.c
index 34a116e840d8b..932161284213c 100644
--- a/arch/mips/lantiq/xway/dma.c
+++ b/arch/mips/lantiq/xway/dma.c
@@ -21,6 +21,7 @@
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/clk.h>
+#include <linux/delay.h>
#include <linux/err.h>

#include <lantiq_soc.h>
@@ -232,6 +233,8 @@ ltq_dma_init(struct platform_device *pdev)
clk_enable(clk);
ltq_dma_w32_mask(0, DMA_RESET, LTQ_DMA_CTRL);

+ usleep_range(1, 10);
+
/* disable all interrupts */
ltq_dma_w32(0, LTQ_DMA_IRNEN);

--
2.33.0
\
 
 \ /
  Last update: 2021-11-09 02:29    [W:0.114 / U:0.804 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site