linux-kernel - Re: [PATCH v5 3/8] mmc: sdhci-of-dwcmshc: factor out code for th1520

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Message-ID: <ZqFtntMl9aw4OBDS@x1>
Date: Wed, 24 Jul 2024 14:09:50 -0700
From: Drew Fustini <drew@...7.com>
To: Chen Wang <unicornxw@...il.com>
Cc: adrian.hunter@...el.com, aou@...s.berkeley.edu, conor+dt@...nel.org,
	guoren@...nel.org, inochiama@...look.com, jszhang@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, palmer@...belt.com,
	paul.walmsley@...ive.com, robh@...nel.org, ulf.hansson@...aro.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-riscv@...ts.infradead.org,
	chao.wei@...hgo.com, haijiao.liu@...hgo.com,
	xiaoguang.xing@...hgo.com, tingzhu.wang@...hgo.com,
	Chen Wang <unicorn_wang@...look.com>
Subject: Re: [PATCH v5 3/8] mmc: sdhci-of-dwcmshc: factor out code for
 th1520_init()

On Fri, Jul 19, 2024 at 04:45:59PM +0800, Chen Wang wrote:
> From: Chen Wang <unicorn_wang@...look.com>
> 
> Different socs have initialization operations in
> the probe process, which are summarized as functions.
> 
> This patch first factor out init function for th1520.
> 
> Signed-off-by: Chen Wang <unicorn_wang@...look.com>
> ---
>  drivers/mmc/host/sdhci-of-dwcmshc.c | 51 +++++++++++++++++------------
>  1 file changed, 30 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> index 903fe06050e4..bb0adc2ee325 100644
> --- a/drivers/mmc/host/sdhci-of-dwcmshc.c
> +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
> @@ -830,6 +830,35 @@ 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);
> @@ -1231,27 +1260,7 @@ static int dwcmshc_probe(struct platform_device *pdev)
>  	}
>  
>  	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);
> +		th1520_init(dev, host, priv);
>  	}
>  
>  #ifdef CONFIG_ACPI
> -- 
> 2.34.1
> 

Reviewd-by: Drew Fustini <drew@...7.com>