[PATCH 21/23] mmc: sdhci-esdhc-imx: factor out hw related intialization into function

[Adrian Hunter]

On 15/04/16 20:29, Dong Aisheng wrote:
> Factor out hw related intialization into a separate function which
> has two benifits:
> 1) concentrate hw related intialization at one place
> 2) ease the hw state restore after resume by simply
> calling this function

There are really 2 changes here, please make it 2 patches.

> 
> Signed-off-by: Dong Aisheng <aisheng.dong at nxp.com>
> ---
>  drivers/mmc/host/sdhci-esdhc-imx.c | 76 +++++++++++++++++++++-----------------
>  1 file changed, 42 insertions(+), 34 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index 3ff213f..95f3632 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -978,6 +978,44 @@ static const struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = {
>  	.ops = &sdhci_esdhc_ops,
>  };
>  
> +static void sdhci_esdhc_imx_hwinit(struct sdhci_host *host)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
> +
> +	if (esdhc_is_usdhc(imx_data)) {
> +		/*
> +		 * The imx6q ROM code will change the default watermark
> +		 * level setting to something insane.  Change it back here.
> +		 */
> +		writel(0x10401040, host->ioaddr + ESDHC_WTMK_LVL);
> +
> +		/*
> +		 * ROM code will change the bit burst_length_enable setting
> +		 * to zero if this usdhc is choosed to boot system. Change
> +		 * it back here, otherwise it will impact the performance a
> +		 * lot. This bit is used to enable/disable the burst length
> +		 * for the external AHB2AXI bridge, it's usefully especially
> +		 * for INCR transfer because without burst length indicator,
> +		 * the AHB2AXI bridge does not know the burst length in
> +		 * advance. And without burst length indicator, AHB INCR
> +		 * transfer can only be converted to singles on the AXI side.
> +		 */
> +		writel(readl(host->ioaddr + SDHCI_HOST_CONTROL)
> +			| ESDHC_BURST_LEN_EN_INCR,
> +			host->ioaddr + SDHCI_HOST_CONTROL);
> +		/*
> +		* errata ESDHC_FLAG_ERR004536 fix for MX6Q TO1.2 and MX6DL
> +		* TO1.1, it's harmless for MX6SL
> +		*/
> +		writel(readl(host->ioaddr + 0x6c) | BIT(7),
> +			host->ioaddr + 0x6c);
> +
> +		/* disable DLL_CTRL delay line settings */
> +		writel(0x0, host->ioaddr + ESDHC_DLL_CTRL);
> +	}
> +}
> +
>  #ifdef CONFIG_OF
>  static int
>  sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
> @@ -1175,43 +1213,13 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
>  		host->quirks |= SDHCI_QUIRK_NO_MULTIBLOCK
>  			| SDHCI_QUIRK_BROKEN_ADMA;
>  
> -	/*
> -	 * The imx6q ROM code will change the default watermark level setting
> -	 * to something insane.  Change it back here.
> -	 */
> -	if (esdhc_is_usdhc(imx_data)) {
> -		writel(0x10401040, host->ioaddr + ESDHC_WTMK_LVL);
> +	sdhci_esdhc_imx_hwinit(host);
>  
> +	if (esdhc_is_usdhc(imx_data)) {
>  		host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
>  		host->mmc->caps |= MMC_CAP_1_8V_DDR;
> -
> -		/*
> -		 * ROM code will change the bit burst_length_enable setting
> -		 * to zero if this usdhc is choosed to boot system. Change
> -		 * it back here, otherwise it will impact the performance a
> -		 * lot. This bit is used to enable/disable the burst length
> -		 * for the external AHB2AXI bridge, it's usefully especially
> -		 * for INCR transfer because without burst length indicator,
> -		 * the AHB2AXI bridge does not know the burst length in
> -		 * advance. And without burst length indicator, AHB INCR
> -		 * transfer can only be converted to singles on the AXI side.
> -		 */
> -		writel(readl(host->ioaddr + SDHCI_HOST_CONTROL)
> -			| ESDHC_BURST_LEN_EN_INCR,
> -			host->ioaddr + SDHCI_HOST_CONTROL);
> -
>  		if (!(imx_data->socdata->flags & ESDHC_FLAG_HS200))
>  			host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
> -
> -		/*
> -		* errata ESDHC_FLAG_ERR004536 fix for MX6Q TO1.2 and MX6DL
> -		* TO1.1, it's harmless for MX6SL
> -		*/
> -		writel(readl(host->ioaddr + 0x6c) | BIT(7),
> -			host->ioaddr + 0x6c);
> -
> -		/* disable DLL_CTRL delay line settings */
> -		writel(0x0, host->ioaddr + ESDHC_DLL_CTRL);
>  	}
>  
>  	if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING)
> @@ -1289,8 +1297,8 @@ static int sdhci_esdhc_resume(struct device *dev)
>  {
>  	struct sdhci_host *host = dev_get_drvdata(dev);
>  
> -	/* restore watermark setting in case it's lost in low power mode */
> -	writel(0x10401040, host->ioaddr + ESDHC_WTMK_LVL);
> +	/* reinitialize hw state in case it's lost in low power mode */
> +	sdhci_esdhc_imx_hwinit(host);
>  
>  	return sdhci_pltfm_resume(dev);
>  }
>