linux-kernel - Re: [PATCH 07/15] usb: typec: tcpci: use GENMASK() for TCPC

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Message-ID: <ZqoZogC9vYg6vSOS@kuha.fi.intel.com>
Date: Wed, 31 Jul 2024 14:01:54 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: André Draszik <andre.draszik@...aro.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peter Griffin <peter.griffin@...aro.org>,
	Tudor Ambarus <tudor.ambarus@...aro.org>,
	Will McVicker <willmcvicker@...gle.com>,
	Badhri Jagan Sridharan <badhri@...gle.com>, kernel-team@...roid.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/15] usb: typec: tcpci: use GENMASK() for TCPC_TRANSMIT
 register fields

On Wed, Jul 10, 2024 at 11:36:14AM +0100, André Draszik wrote:
> Convert all fields from register TCPC_TRANSMIT to using GENMASK() and
> FIELD_PREP() so as to keep using a similar approach throughout the code
> base and make it arguably easier to read.
> 
> Signed-off-by: André Draszik <andre.draszik@...aro.org>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/usb/typec/tcpm/tcpci.c | 7 +++++--
>  include/linux/usb/tcpci.h      | 6 ++----
>  2 files changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c
> index ad5c9d5bf6a9..b9ee9ccff99b 100644
> --- a/drivers/usb/typec/tcpm/tcpci.c
> +++ b/drivers/usb/typec/tcpm/tcpci.c
> @@ -607,8 +607,11 @@ static int tcpci_pd_transmit(struct tcpc_dev *tcpc, enum tcpm_transmit_type type
>  	}
>  
>  	/* nRetryCount is 3 in PD2.0 spec where 2 in PD3.0 spec */
> -	reg = ((negotiated_rev > PD_REV20 ? PD_RETRY_COUNT_3_0_OR_HIGHER : PD_RETRY_COUNT_DEFAULT)
> -	       << TCPC_TRANSMIT_RETRY_SHIFT) | (type << TCPC_TRANSMIT_TYPE_SHIFT);
> +	reg = FIELD_PREP(TCPC_TRANSMIT_RETRY,
> +			 (negotiated_rev > PD_REV20
> +			  ? PD_RETRY_COUNT_3_0_OR_HIGHER
> +			  : PD_RETRY_COUNT_DEFAULT));
> +	reg |= FIELD_PREP(TCPC_TRANSMIT_TYPE, type);
>  	ret = regmap_write(tcpci->regmap, TCPC_TRANSMIT, reg);
>  	if (ret < 0)
>  		return ret;
> diff --git a/include/linux/usb/tcpci.h b/include/linux/usb/tcpci.h
> index 3cd61e9f73b3..f7f5cfbdef12 100644
> --- a/include/linux/usb/tcpci.h
> +++ b/include/linux/usb/tcpci.h
> @@ -148,10 +148,8 @@
>  #define TCPC_RX_DATA			0x34 /* through 0x4f */
>  
>  #define TCPC_TRANSMIT			0x50
> -#define TCPC_TRANSMIT_RETRY_SHIFT	4
> -#define TCPC_TRANSMIT_RETRY_MASK	0x3
> -#define TCPC_TRANSMIT_TYPE_SHIFT	0
> -#define TCPC_TRANSMIT_TYPE_MASK		0x7
> +#define TCPC_TRANSMIT_RETRY		GENMASK(5, 4)
> +#define TCPC_TRANSMIT_TYPE		GENMASK(2, 0)
>  
>  #define TCPC_TX_BYTE_CNT		0x51
>  #define TCPC_TX_HDR			0x52
> 
> -- 
> 2.45.2.803.g4e1b14247a-goog

-- 
heikki