[PATCH linux] arm: aspeed: zaius: Disable LPC reset for UART1

[Rick Altherr]

>From the patch, I can't tell what your change is doing.  You've described
the problem but not the solution.

On Fri, Jan 27, 2017 at 9:08 AM, Xo Wang <xow at google.com> wrote:

> Currently, UART1 on Zaius BMC is unusable until brought out of reset by
> powering the host on. In this reset state, ttyS0 can still be opened
> and UART1 silently drops bytes, which is not obviously expected
> behavior.
>
> Signed-off-by: Xo Wang <xow at google.com
> ---
>  arch/arm/mach-aspeed/aspeed.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm/mach-aspeed/aspeed.c b/arch/arm/mach-aspeed/aspeed.c
> index 4bd3680d742d..9f06191f1630 100644
> --- a/arch/arm/mach-aspeed/aspeed.c
> +++ b/arch/arm/mach-aspeed/aspeed.c
> @@ -185,6 +185,10 @@ static void __init do_zaius_setup(void)
>
>         /* Set SPI1 CE0 decoding window to 0x30000000 */
>         writel(0x68600000, AST_IO(AST_BASE_SPI | 0x30));
> +
> +       /* Disable LPC reset for UART1 */
> +       reg = readl(AST_IO(AST_BASE_LPC | 0x98));
> +       writel(reg & ~BIT(4), AST_IO(AST_BASE_LPC | 0x98));
>  }
>
>  static void __init do_witherspoon_setup(void)
> --
> 2.11.0.483.g087da7b7c-goog
>
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