linux-kernel - Re: [PATCH 2/2] clk: qcom: gcc-sc7180: Add 50 MHz clock rate for SDC2

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Date:   Thu, 10 Dec 2020 13:41:28 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Stephen Boyd <sboyd@...nel.org>, Taniya Das <tdas@...eaurora.org>,
        vbadigan@...eaurora.org, Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] clk: qcom: gcc-sc7180: Add 50 MHz clock rate for SDC2

On Thu 10 Dec 12:22 CST 2020, Douglas Anderson wrote:

> 50 MHz is an incredibly common clock rate for SD cards to run at.
> It's "high speed" mode in SD (not very fast these days, but it used to
> be) or:
>   #define HIGH_SPEED_MAX_DTR	50000000
> 
> If we don't support this then older "high speed" cards can only run at
> 25 MHz or at half their normal speed.  There doesn't seem to be any
> reason to skip this clock rate, so add it.
> 
> Fixes: 17269568f726 ("clk: qcom: Add Global Clock controller (GCC) driver for SC7180")
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
> 
>  drivers/clk/qcom/gcc-sc7180.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/clk/qcom/gcc-sc7180.c b/drivers/clk/qcom/gcc-sc7180.c
> index b080739ab0c3..d82d725ac231 100644
> --- a/drivers/clk/qcom/gcc-sc7180.c
> +++ b/drivers/clk/qcom/gcc-sc7180.c
> @@ -651,6 +651,7 @@ static const struct freq_tbl ftbl_gcc_sdcc2_apps_clk_src[] = {
>  	F(9600000, P_BI_TCXO, 2, 0, 0),
>  	F(19200000, P_BI_TCXO, 1, 0, 0),
>  	F(25000000, P_GPLL0_OUT_EVEN, 12, 0, 0),
> +	F(50000000, P_GPLL0_OUT_EVEN, 6, 0, 0),
>  	F(100000000, P_GPLL0_OUT_EVEN, 3, 0, 0),
>  	F(202000000, P_GPLL7_OUT_MAIN, 4, 0, 0),
>  	{ }
> -- 
> 2.29.2.576.ga3fc446d84-goog
>