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From:   Chunyan Zhang <zhang.lyra@gmail.com>
Date:   Fri, 3 Apr 2020 09:56:41 +0800
Message-ID: <CAAfSe-vYe2LiAhYMuqJpt07VcXO_phuY8zUv5151JjHxxViB5w@mail.gmail.com>
Subject: Re: [PATCH] clk: sprd: don't gate uart console clock
To:     Stephen Boyd <sboyd@kernel.org>,
        Michael Turquette <mturquette@baylibre.com>
Cc:     linux-clk <linux-clk@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Orson Zhai <orsonzhai@gmail.com>,
        Baolin Wang <baolin.wang7@gmail.com>,
        Chunyan Zhang <chunyan.zhang@unisoc.com>
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Hi Stephen,

This is also a fix, could you please take it into clk-next as well?

Thanks,
Chunyan

On Tue, 31 Mar 2020 at 18:45, Chunyan Zhang <zhang.lyra@gmail.com> wrote:
>
> Don't gate uart1_eb which provides console clock, gating that clock would
> make serial stop working if serial driver didn't enable that explicitly.
>
> Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
> ---
>  drivers/clk/sprd/sc9863a-clk.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/sprd/sc9863a-clk.c b/drivers/clk/sprd/sc9863a-clk.c
> index 24f064262814..6c6ac158ef61 100644
> --- a/drivers/clk/sprd/sc9863a-clk.c
> +++ b/drivers/clk/sprd/sc9863a-clk.c
> @@ -1671,8 +1671,9 @@ static SPRD_SC_GATE_CLK_FW_NAME(i2c4_eb,  "i2c4-eb",      "ext-26m", 0x0,
>                                 0x1000, BIT(12), 0, 0);
>  static SPRD_SC_GATE_CLK_FW_NAME(uart0_eb,      "uart0-eb",     "ext-26m", 0x0,
>                                 0x1000, BIT(13), 0, 0);
> +/* uart1_eb is for console, don't gate even if unused */
>  static SPRD_SC_GATE_CLK_FW_NAME(uart1_eb,      "uart1-eb",     "ext-26m", 0x0,
> -                               0x1000, BIT(14), 0, 0);
> +                               0x1000, BIT(14), CLK_IGNORE_UNUSED, 0);
>  static SPRD_SC_GATE_CLK_FW_NAME(uart2_eb,      "uart2-eb",     "ext-26m", 0x0,
>                                 0x1000, BIT(15), 0, 0);
>  static SPRD_SC_GATE_CLK_FW_NAME(uart3_eb,      "uart3-eb",     "ext-26m", 0x0,
> --
> 2.20.1
>