linux-kernel - Re: [PATCH] clk: qcom: gcc-sc7180: Use floor ops for the correct sdcc1 clk

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Message-ID: <3b972d6d-15df-ddf6-c57f-9e1ad08564db@codeaurora.org>
Date:   Mon, 1 Mar 2021 22:30:31 +0530
From:   Taniya Das <tdas@...eaurora.org>
To:     Douglas Anderson <dianders@...omium.org>, sboyd@...nel.org
Cc:     vbadigan@...eaurora.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.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] clk: qcom: gcc-sc7180: Use floor ops for the correct
 sdcc1 clk

Reviewed-by: Taniya Das <tdas@...eaurora.org>

On 2/24/2021 11:20 PM, Douglas Anderson wrote:
> While picking commit a8cd989e1a57 ("mmc: sdhci-msm: Warn about
> overclocking SD/MMC") back to my tree I was surprised that it was
> reporting warnings.  I thought I fixed those!  Looking closer at the
> fix, I see that I totally bungled it (or at least I halfway bungled
> it).  The SD card clock got fixed (and that was the one I was really
> focused on fixing), but I totally adjusted the wrong clock for eMMC.
> Sigh.  Let's fix my dumb mistake.
> 
> Now both SD and eMMC have floor for the "apps" clock.
> 
> This doesn't matter a lot for the final clock rate for HS400 eMMC but
> could matter if someone happens to put some slower eMMC on a sc7180.
> We also transition through some of these lower rates sometimes and
> having them wrong could cause problems during these transitions.
> These were the messages I was seeing at boot:
>    mmc1: Card appears overclocked; req 52000000 Hz, actual 100000000 Hz
>    mmc1: Card appears overclocked; req 52000000 Hz, actual 100000000 Hz
>    mmc1: Card appears overclocked; req 104000000 Hz, actual 192000000 Hz
> 
> Fixes: 6d37a8d19283 ("clk: qcom: gcc-sc7180: Use floor ops for sdcc clks")
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
> 
>   drivers/clk/qcom/gcc-sc7180.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/qcom/gcc-sc7180.c b/drivers/clk/qcom/gcc-sc7180.c
> index c5c2e93bda8e..5cacd20a31b3 100644
> --- a/drivers/clk/qcom/gcc-sc7180.c
> +++ b/drivers/clk/qcom/gcc-sc7180.c
> @@ -620,7 +620,7 @@ static struct clk_rcg2 gcc_sdcc1_apps_clk_src = {
>   		.name = "gcc_sdcc1_apps_clk_src",
>   		.parent_data = gcc_parent_data_1,
>   		.num_parents = 5,
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_rcg2_floor_ops,
>   	},
>   };
>   
> @@ -642,7 +642,7 @@ static struct clk_rcg2 gcc_sdcc1_ice_core_clk_src = {
>   		.name = "gcc_sdcc1_ice_core_clk_src",
>   		.parent_data = gcc_parent_data_0,
>   		.num_parents = 4,
> -		.ops = &clk_rcg2_floor_ops,
> +		.ops = &clk_rcg2_ops,
>   	},
>   };
>   
> 

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