Re: [PATCH v3 3/4] mmc: sdhci-of-dwcmshc: extract init function for rk35xx/th1520

From: Adrian Hunter <adrian.hunter@intel.com>
To: Chen Wang <unicornxw@gmail.com>,
	aou@eecs.berkeley.edu, conor+dt@kernel.org, guoren@kernel.org,
	inochiama@outlook.com, jszhang@kernel.org,
	krzysztof.kozlowski+dt@linaro.org, palmer@dabbelt.com,
	paul.walmsley@sifive.com, robh@kernel.org,
	ulf.hansson@linaro.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org,
	linux-riscv@lists.infradead.org, chao.wei@sophgo.com,
	haijiao.liu@sophgo.com, xiaoguang.xing@sophgo.com,
	tingzhu.wang@sophgo.com
Cc: Chen Wang <unicorn_wang@outlook.com>
Subject: Re: [PATCH v3 3/4] mmc: sdhci-of-dwcmshc: extract init function for rk35xx/th1520
Date: Fri, 14 Jun 2024 13:33:10 +0300	[thread overview]
Message-ID: <9490cba1-1fa3-4a00-bab8-aa4a07a418f5@intel.com> (raw)
In-Reply-To: <459e341a32128ffbae5acdc77a1c835cbee582e6.1718241495.git.unicorn_wang@outlook.com>

On 13/06/24 04:43, Chen Wang wrote:
> From: Chen Wang <unicorn_wang@outlook.com>
> 
> Extract init function for rk35xx/th1520, which is an intermediate
> process before further optimization.
> 
> Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
> ---
>  drivers/mmc/host/sdhci-of-dwcmshc.c | 83 ++++++++++++++++-------------
>  1 file changed, 46 insertions(+), 37 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> index 346d2d323a05..38ab755aa044 100644
> --- a/drivers/mmc/host/sdhci-of-dwcmshc.c
> +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
> @@ -749,10 +749,19 @@ static void rk35xx_sdhci_reset(struct sdhci_host *host, u8 mask)
>  	sdhci_reset(host, mask);
>  }
>  
> -static int rk35xx_init(struct sdhci_host *host, struct dwcmshc_priv *dwc_priv)
> +static int rk35xx_init(struct device *dev, struct sdhci_host *host, struct dwcmshc_priv *dwc_priv)
>  {
>  	int err;
> -	struct rk35xx_priv *priv = dwc_priv->priv;
> +	struct rk35xx_priv *priv;
> +
> +	priv = devm_kzalloc(dev, sizeof(struct rk35xx_priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	if (of_device_is_compatible(dev->of_node, "rockchip,rk3588-dwcmshc"))
> +		priv->devtype = DWCMSHC_RK3588;
> +	else
> +		priv->devtype = DWCMSHC_RK3568;
>  
>  	priv->reset = devm_reset_control_array_get_optional_exclusive(mmc_dev(host->mmc));
>  	if (IS_ERR(priv->reset)) {
> @@ -787,6 +796,8 @@ static int rk35xx_init(struct sdhci_host *host, struct dwcmshc_priv *dwc_priv)
>  	sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_TXCLK);
>  	sdhci_writel(host, 0, DWCMSHC_EMMC_DLL_STRBIN);
>  
> +	dwc_priv->priv = priv;
> +
>  	return 0;
>  }
>  
> @@ -915,6 +926,35 @@ static void th1520_sdhci_reset(struct sdhci_host *host, u8 mask)
>  	}
>  }
>  
> +static int th1520_init(struct device *dev,
> +		       struct sdhci_host *host,
> +		       struct dwcmshc_priv *dwc_priv)
> +{
> +	dwc_priv->delay_line = PHY_SDCLKDL_DC_DEFAULT;
> +
> +	if (device_property_read_bool(dev, "mmc-ddr-1_8v") ||
> +	    device_property_read_bool(dev, "mmc-hs200-1_8v") ||
> +	    device_property_read_bool(dev, "mmc-hs400-1_8v"))
> +		dwc_priv->flags |= FLAG_IO_FIXED_1V8;
> +	else
> +		dwc_priv->flags &= ~FLAG_IO_FIXED_1V8;
> +
> +	/*
> +	 * start_signal_voltage_switch() will try 3.3V first
> +	 * then 1.8V. Use SDHCI_SIGNALING_180 rather than
> +	 * SDHCI_SIGNALING_330 to avoid setting voltage to 3.3V
> +	 * in sdhci_start_signal_voltage_switch().
> +	 */
> +	if (dwc_priv->flags & FLAG_IO_FIXED_1V8) {
> +		host->flags &= ~SDHCI_SIGNALING_330;
> +		host->flags |=  SDHCI_SIGNALING_180;
> +	}
> +
> +	sdhci_enable_v4_mode(host);
> +
> +	return 0;
> +}
> +
>  static void cv18xx_sdhci_reset(struct sdhci_host *host, u8 mask)
>  {
>  	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> @@ -1230,46 +1270,15 @@ static int dwcmshc_probe(struct platform_device *pdev)
>  	host->mmc_host_ops.execute_tuning = dwcmshc_execute_tuning;
>  
>  	if (pltfm_data == &sdhci_dwcmshc_rk35xx_pdata) {
> -		rk_priv = devm_kzalloc(&pdev->dev, sizeof(struct rk35xx_priv), GFP_KERNEL);
> -		if (!rk_priv) {
> -			err = -ENOMEM;
> -			goto err_clk;
> -		}
> -
> -		if (of_device_is_compatible(pdev->dev.of_node, "rockchip,rk3588-dwcmshc"))
> -			rk_priv->devtype = DWCMSHC_RK3588;
> -		else
> -			rk_priv->devtype = DWCMSHC_RK3568;
> -
> -		priv->priv = rk_priv;
> -
> -		err = rk35xx_init(host, priv);
> +		err = rk35xx_init(&pdev->dev, host, priv);

rk_priv is used further on, but it is not assigned anymore.

>  		if (err)
>  			goto err_clk;
>  	}
>  
>  	if (pltfm_data == &sdhci_dwcmshc_th1520_pdata) {
> -		priv->delay_line = PHY_SDCLKDL_DC_DEFAULT;
> -
> -		if (device_property_read_bool(dev, "mmc-ddr-1_8v") ||
> -		    device_property_read_bool(dev, "mmc-hs200-1_8v") ||
> -		    device_property_read_bool(dev, "mmc-hs400-1_8v"))
> -			priv->flags |= FLAG_IO_FIXED_1V8;
> -		else
> -			priv->flags &= ~FLAG_IO_FIXED_1V8;
> -
> -		/*
> -		 * start_signal_voltage_switch() will try 3.3V first
> -		 * then 1.8V. Use SDHCI_SIGNALING_180 rather than
> -		 * SDHCI_SIGNALING_330 to avoid setting voltage to 3.3V
> -		 * in sdhci_start_signal_voltage_switch().
> -		 */
> -		if (priv->flags & FLAG_IO_FIXED_1V8) {
> -			host->flags &= ~SDHCI_SIGNALING_330;
> -			host->flags |=  SDHCI_SIGNALING_180;
> -		}
> -
> -		sdhci_enable_v4_mode(host);
> +		err = th1520_init(&pdev->dev, host, priv);
> +		if (err)
> +			goto err_clk;
>  	}
>  
>  #ifdef CONFIG_ACPI

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