diff options
| author | Aleksander Jan Bajkowski <olek2@wp.pl> | 2021-09-15 00:20:58 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-18 21:16:09 +0300 |
| commit | 6a5b3f5dfb02e2ce9f0c98e74b18b7d1ad9cf13d (patch) | |
| tree | 7cc3a72061831dc09c5299fb727bace3a5c8adeb | |
| parent | 55bf61828ab33b959ecc41b66c6a3725fb921ec1 (diff) | |
| download | linux-6a5b3f5dfb02e2ce9f0c98e74b18b7d1ad9cf13d.tar.xz | |
MIPS: lantiq: dma: add small delay after reset
[ 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>
| -rw-r--r-- | arch/mips/lantiq/xway/dma.c | 3 |
1 files changed, 3 insertions, 0 deletions
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); |