linux-kernel - Re: [PATCH 3/4] mmc: sdhci-of-arasan: Add support for DLL reset for ZynqMP platforms

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Date:   Mon, 3 Feb 2020 13:31:37 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Manish Narani <manish.narani@...inx.com>, michal.simek@...inx.com,
        ulf.hansson@...aro.org, jolly.shah@...inx.com,
        rajan.vaja@...inx.com, nava.manne@...inx.com,
        tejas.patel@...inx.com
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org
Subject: Re: [PATCH 3/4] mmc: sdhci-of-arasan: Add support for DLL reset for
 ZynqMP platforms

On 21/01/20 12:21 pm, Manish Narani wrote:
> The DLL resets are required while executing the auto tuning procedure in
> ZynqMP. This patch adds code to support the same.
> 
> Signed-off-by: Manish Narani <manish.narani@...inx.com>

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

> ---
>  drivers/mmc/host/sdhci-of-arasan.c | 46 ++++++++++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
> index e49b44b4d82e..39176ab5ca1f 100644
> --- a/drivers/mmc/host/sdhci-of-arasan.c
> +++ b/drivers/mmc/host/sdhci-of-arasan.c
> @@ -757,6 +757,50 @@ static const struct clk_ops zynqmp_sampleclk_ops = {
>  	.set_phase = sdhci_zynqmp_sampleclk_set_phase,
>  };
>  
> +static void arasan_zynqmp_dll_reset(struct sdhci_host *host, u32 deviceid)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
> +	struct sdhci_arasan_zynqmp_clk_data *zynqmp_clk_data =
> +		sdhci_arasan->clk_data.clk_of_data;
> +	const struct zynqmp_eemi_ops *eemi_ops = zynqmp_clk_data->eemi_ops;
> +	u16 clk;
> +
> +	clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> +	clk &= ~(SDHCI_CLOCK_CARD_EN | SDHCI_CLOCK_INT_EN);
> +	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> +
> +	/* Issue DLL Reset */
> +	eemi_ops->ioctl(deviceid, IOCTL_SD_DLL_RESET,
> +			PM_DLL_RESET_PULSE, 0, NULL);
> +
> +	clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> +
> +	sdhci_enable_clk(host, clk);
> +}
> +
> +static int arasan_zynqmp_execute_tuning(struct mmc_host *mmc, u32 opcode)
> +{
> +	struct sdhci_host *host = mmc_priv(mmc);
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
> +	struct clk_hw *hw = &sdhci_arasan->clk_data.sdcardclk_hw;
> +	const char *clk_name = clk_hw_get_name(hw);
> +	u32 device_id = !strcmp(clk_name, "clk_out_sd0") ? NODE_SD_0 :
> +							   NODE_SD_1;
> +	int err;
> +
> +	arasan_zynqmp_dll_reset(host, device_id);
> +
> +	err = sdhci_execute_tuning(mmc, opcode);
> +	if (err)
> +		return err;
> +
> +	arasan_zynqmp_dll_reset(host, device_id);
> +
> +	return 0;
> +}
> +
>  /**
>   * sdhci_arasan_update_clockmultiplier - Set corecfg_clockmultiplier
>   *
> @@ -1247,6 +1291,8 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
>  
>  		zynqmp_clk_data->eemi_ops = eemi_ops;
>  		sdhci_arasan->clk_data.clk_of_data = zynqmp_clk_data;
> +		host->mmc_host_ops.execute_tuning =
> +			arasan_zynqmp_execute_tuning;
>  	}
>  
>  	arasan_dt_parse_clk_phases(&pdev->dev, &sdhci_arasan->clk_data);
>