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[net-next,1/8] MIPS: lantiq: dma: add small delay after reset

Message ID 20210914212105.76186-1-olek2@wp.pl
State Accepted
Commit c12aa581f6d5e80c3c3675ab26a52c2b3b62f76e
Headers show
Series [net-next,1/8] MIPS: lantiq: dma: add small delay after reset | expand

Commit Message

Aleksander Jan Bajkowski Sept. 14, 2021, 9:20 p.m. UTC 
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>
---
 arch/mips/lantiq/xway/dma.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/arch/mips/lantiq/xway/dma.c b/arch/mips/lantiq/xway/dma.c
index 63dccb2ed08b..2784715933d1 100644
--- 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 <linux/of.h>
 
@@ -222,6 +223,8 @@  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);