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);