linux-kernel - Re: [PATCH v3 4/4] mmc: sdhci-tegra: Use actual clock rate for SW tuning correction

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Message-ID: <31458181-a30f-8f85-f19c-084fdda5106b@intel.com>
Date:   Thu, 22 Sep 2022 14:33:47 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Prathamesh Shete <pshete@...dia.com>, ulf.hansson@...aro.org,
        thierry.reding@...il.com, jonathanh@...dia.com,
        p.zabel@...gutronix.de, linux-mmc@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     anrao@...dia.com, smangipudi@...dia.com, kyarlagadda@...dia.com
Subject: Re: [PATCH v3 4/4] mmc: sdhci-tegra: Use actual clock rate for SW
 tuning correction

On 20/09/22 15:37, Prathamesh Shete wrote:
> Ensure tegra_host member "curr_clk_rate" holds the actual clock rate
> instead of requested clock rate for proper use during tuning correction
> algorithm. Actual clk rate may not be the same as the requested clk
> frequency depending on the parent clock source set. Tuning correction
> algorithm depends on certain parameters which are sensitive to current
> clk rate. If the host clk is selected instead of the actual clock rate,
> tuning correction algorithm may end up applying invalid correction,
> which could result in errors
> 
> Fixes: ea8fc5953e8b ("mmc: tegra: update hw tuning process")
> 
> Signed-off-by: Aniruddha TVS Rao <anrao@...dia.com>
> Signed-off-by: Prathamesh Shete <pshete@...dia.com>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  drivers/mmc/host/sdhci-tegra.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index 58449e010a9b..10f6df070456 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -780,7 +780,7 @@ static void tegra_sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
>  		dev_err(dev, "failed to set clk rate to %luHz: %d\n",
>  			host_clk, err);
>  
> -	tegra_host->curr_clk_rate = host_clk;
> +	tegra_host->curr_clk_rate = clk_get_rate(pltfm_host->clk);
>  	if (tegra_host->ddr_signaling)
>  		host->max_clk = host_clk;
>  	else