netdev - Re: [PATCH v2] can: mcp251xfd: replace sizeof(u32) with val

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Message-ID: <20210121092115.dasphwfzfkthcy64@hardanger.blackshift.org>
Date:   Thu, 21 Jan 2021 10:21:15 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Su Yanjun <suyanjun218@...il.com>
Cc:     manivannan.sadhasivam@...aro.org, thomas.kopp@...rochip.com,
        wg@...ndegger.com, davem@...emloft.net, kuba@...nel.org,
        lgirdwood@...il.com, broonie@...nel.org, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] can: mcp251xfd: replace sizeof(u32) with val_bytes in
 regmap

On Thu, Jan 21, 2021 at 05:10:05PM +0800, Su Yanjun wrote:

Please describe why you change this.

> No functional effect.

Not quite:

scripts/bloat-o-meter shows:

add/remove: 0/0 grow/shrink: 3/0 up/down: 104/0 (104)
Function                                     old     new   delta
mcp251xfd_handle_tefif                       980    1028     +48
mcp251xfd_irq                               3716    3756     +40
mcp251xfd_handle_rxif_ring                   964     980     +16
Total: Before=20832, After=20936, chg +0.50%

> 
> Signed-off-by: Su Yanjun <suyanjun218@...il.com>
> ---
>  drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
> index f07e8b737d31..b15bfd50b863 100644
> --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
> +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
> @@ -181,6 +181,12 @@ static int mcp251xfd_clks_and_vdd_disable(const struct mcp251xfd_priv *priv)
>  	return 0;
>  }
>  
> +static inline int
> +mcp251xfd_get_val_bytes(const struct mcp251xfd_priv *priv)
> +{
> +	return regmap_get_val_bytes(priv->map_reg);

You're always using the "map_reg" here

> +}
> +
>  static inline u8
>  mcp251xfd_cmd_prepare_write_reg(const struct mcp251xfd_priv *priv,
>  				union mcp251xfd_write_reg_buf *write_reg_buf,
> @@ -1308,6 +1314,7 @@ mcp251xfd_tef_obj_read(const struct mcp251xfd_priv *priv,
>  		       const u8 offset, const u8 len)
>  {
>  	const struct mcp251xfd_tx_ring *tx_ring = priv->tx;
> +	int val_bytes = mcp251xfd_get_val_bytes(priv);
>  
>  	if (IS_ENABLED(CONFIG_CAN_MCP251XFD_SANITY) &&
>  	    (offset > tx_ring->obj_num ||
> @@ -1322,7 +1329,7 @@ mcp251xfd_tef_obj_read(const struct mcp251xfd_priv *priv,
>  	return regmap_bulk_read(priv->map_rx,

But this works on map_rx.

>  				mcp251xfd_get_tef_obj_addr(offset),
>  				hw_tef_obj,
> -				sizeof(*hw_tef_obj) / sizeof(u32) * len);
> +				sizeof(*hw_tef_obj) / val_bytes * len);
>  }
>  
>  static int mcp251xfd_handle_tefif(struct mcp251xfd_priv *priv)
> @@ -1511,11 +1518,12 @@ mcp251xfd_rx_obj_read(const struct mcp251xfd_priv *priv,
>  		      const u8 offset, const u8 len)
>  {
>  	int err;
> +	int val_bytes = mcp251xfd_get_val_bytes(priv);
>  
>  	err = regmap_bulk_read(priv->map_rx,

Same here

>  			       mcp251xfd_get_rx_obj_addr(ring, offset),
>  			       hw_rx_obj,
> -			       len * ring->obj_size / sizeof(u32));
> +			       len * ring->obj_size / val_bytes);
>  
>  	return err;
>  }
> @@ -2139,6 +2147,7 @@ static irqreturn_t mcp251xfd_irq(int irq, void *dev_id)
>  	struct mcp251xfd_priv *priv = dev_id;
>  	irqreturn_t handled = IRQ_NONE;
>  	int err;
> +	int val_bytes = mcp251xfd_get_val_bytes(priv);
>  
>  	if (priv->rx_int)
>  		do {
> @@ -2162,7 +2171,7 @@ static irqreturn_t mcp251xfd_irq(int irq, void *dev_id)
>  		err = regmap_bulk_read(priv->map_reg, MCP251XFD_REG_INT,

Here it's map_reg.

>  				       &priv->regs_status,
>  				       sizeof(priv->regs_status) /
> -				       sizeof(u32));
> +				       val_bytes);
>  		if (err)
>  			goto out_fail;
>  
> -- 
> 2.25.1

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
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