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From 497acc03cd3918baabe25d46e30c5c62b998e24d Mon Sep 17 00:00:00 2001
From: Aleksander Jan Bajkowski <olek2@wp.pl>
Date: Sat, 19 Jun 2021 13:38:12 +0200
Subject: [PATCH 1/5] MIPS: lantiq: dma: add small delay after reset
Reading the DMA registers immediately after the reset causes
Data Bus Error. Adding a small delay fixes this problem.
Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
---
arch/mips/lantiq/xway/dma.c | 3 +++
1 file changed, 3 insertions(+)
--- a/arch/mips/lantiq/xway/dma.c
+++ b/arch/mips/lantiq/xway/dma.c
@@ -11,6 +11,7 @@
#include <linux/export.h>
#include <linux/spinlock.h>
#include <linux/clk.h>
+#include <linux/delay.h>
#include <linux/err.h>
#include <lantiq_soc.h>
@@ -221,6 +222,8 @@ ltq_dma_init(struct platform_device *pde
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);
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