netdev - Re: [PATCH 1/3] can: flexcan: add auto stop mode for IMX93 to support wakeup

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Message-ID: <20221124143957.fr5fojvu3fa5vhnj@pengutronix.de>
Date:   Thu, 24 Nov 2022 15:39:57 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     haibo.chen@....com
Cc:     wg@...ndegger.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/3] can: flexcan: add auto stop mode for IMX93 to
 support wakeup

On 22.11.2022 19:32:30, haibo.chen@....com wrote:
> From: Haibo Chen <haibo.chen@....com>
> 
> IMX93 do not contain a GPR to config the stop mode, it will set
> the flexcan into stop mode automatically once the ARM core go
> into low power mode (WFI instruct) and gate off the flexcan
> related clock automatically. But to let these logic work as
> expect, before ARM core go into low power mode, need to make
> sure the flexcan related clock keep on.
> 
> To support stop mode and wakeup feature on imx93, this patch
> add a new fsl_imx93_devtype_data to separate from imx8mp.
> 
> Signed-off-by: Haibo Chen <haibo.chen@....com>
> ---
>  drivers/net/can/flexcan/flexcan-core.c | 37 +++++++++++++++++++++++---
>  drivers/net/can/flexcan/flexcan.h      |  2 ++
>  2 files changed, 36 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/can/flexcan/flexcan-core.c b/drivers/net/can/flexcan/flexcan-core.c
> index 9bdadd716f4e..0aeff34e5ae1 100644
> --- a/drivers/net/can/flexcan/flexcan-core.c
> +++ b/drivers/net/can/flexcan/flexcan-core.c
> @@ -345,6 +345,15 @@ static struct flexcan_devtype_data fsl_imx8mp_devtype_data = {
>  		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR,
>  };
>  
> +static struct flexcan_devtype_data fsl_imx93_devtype_data = {
> +	.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
> +		FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_USE_RX_MAILBOX |
> +		FLEXCAN_QUIRK_BROKEN_PERR_STATE | FLEXCAN_QUIRK_AUTO_STOP_MODE |
> +		FLEXCAN_QUIRK_SUPPORT_FD | FLEXCAN_QUIRK_SUPPORT_ECC |
> +		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
> +		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR,
> +};
> +
>  static const struct flexcan_devtype_data fsl_vf610_devtype_data = {
>  	.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
>  		FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_USE_RX_MAILBOX |
> @@ -532,9 +541,14 @@ static inline int flexcan_enter_stop_mode(struct flexcan_priv *priv)
>  		ret = flexcan_stop_mode_enable_scfw(priv, true);
>  		if (ret < 0)
>  			return ret;
> -	} else {
> +	} else if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE_GPR) {
>  		regmap_update_bits(priv->stm.gpr, priv->stm.req_gpr,
>  				   1 << priv->stm.req_bit, 1 << priv->stm.req_bit);
> +	} else if (priv->devtype_data.quirks & FLEXCAN_QUIRK_AUTO_STOP_MODE) {
> +		/* For the auto stop mode, software do nothing, hardware will cover
> +		 * all the operation automatically after system go into low power mode.
> +		 */
> +		return 0;
>  	}
>  
>  	return flexcan_low_power_enter_ack(priv);
> @@ -551,7 +565,7 @@ static inline int flexcan_exit_stop_mode(struct flexcan_priv *priv)
>  		ret = flexcan_stop_mode_enable_scfw(priv, false);
>  		if (ret < 0)
>  			return ret;
> -	} else {
> +	} else if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE_GPR) {
>  		regmap_update_bits(priv->stm.gpr, priv->stm.req_gpr,
>  				   1 << priv->stm.req_bit, 0);
>  	}
> @@ -560,6 +574,12 @@ static inline int flexcan_exit_stop_mode(struct flexcan_priv *priv)
>  	reg_mcr &= ~FLEXCAN_MCR_SLF_WAK;
>  	priv->write(reg_mcr, &regs->mcr);
>  
> +	/* For the auto stop mode, hardware will exist stop mode
                                                 ^^^^^
                                                 exit?

No need to resend.

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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