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    Subject[PATCH 5.10 172/575] MIPS: lantiq: dma: add small delay after reset
    Date
    From: Aleksander Jan Bajkowski <olek2@wp.pl>

    [ 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>
    ---
    arch/mips/lantiq/xway/dma.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/arch/mips/lantiq/xway/dma.c b/arch/mips/lantiq/xway/dma.c
    index aeb1b989cd4ee..24c6267f78698 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 <lantiq_soc.h>
    @@ -221,6 +222,8 @@ 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);

    --
    2.33.0


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