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MIPS: lantiq: dma: add small delay after reset

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[ 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>
This commit is contained in:
Aleksander Jan Bajkowski 2021-09-14 23:20:58 +02:00 committed by Greg Kroah-Hartman
parent 396e302cc8
commit 5af57ce8a6
1 changed files with 3 additions and 0 deletions
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arch/mips/lantiq/xway/dma.c
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@ -11,6 +11,7 @@
#include <linux/export.h> #include <linux/export.h>
#include <linux/spinlock.h> #include <linux/spinlock.h>
#include <linux/clk.h> #include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h> #include <linux/err.h>
#include <lantiq_soc.h> #include <lantiq_soc.h>
@ -221,6 +222,8 @@ ltq_dma_init(struct platform_device *pdev)
clk_enable(clk); clk_enable(clk);
ltq_dma_w32_mask(0, DMA_RESET, LTQ_DMA_CTRL); ltq_dma_w32_mask(0, DMA_RESET, LTQ_DMA_CTRL);
usleep_range(1, 10);
/* disable all interrupts */ /* disable all interrupts */
ltq_dma_w32(0, LTQ_DMA_IRNEN); ltq_dma_w32(0, LTQ_DMA_IRNEN);