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| author | Aleksander Jan Bajkowski <olek2@wp.pl> | 2021-09-14 23:20:58 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-26 11:58:37 +0100 |
| commit | 6086d6c30025eccf0c21a18145b6dfbce5cfdc1c (patch) | |
| tree | 1a529c56c3eb4129c99821f28d28430f86ab5e6f /arch | |
| parent | 655904524490d1ad1dabee5446ff4573aa909505 (diff) | |
| download | linux-stable-6086d6c30025eccf0c21a18145b6dfbce5cfdc1c.tar.gz linux-stable-6086d6c30025eccf0c21a18145b6dfbce5cfdc1c.tar.bz2 linux-stable-6086d6c30025eccf0c21a18145b6dfbce5cfdc1c.zip | |
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>
Diffstat (limited to 'arch')
| -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 34a116e840d8..932161284213 100644 --- a/arch/mips/lantiq/xway/dma.c +++ b/arch/mips/lantiq/xway/dma.c @@ -21,6 +21,7 @@ #include <linux/dma-mapping.h> #include <linux/module.h> #include <linux/clk.h> +#include <linux/delay.h> #include <linux/err.h> #include <lantiq_soc.h> @@ -232,6 +233,8 @@ 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); |