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

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Date:   Thu, 21 Jan 2021 17:33:40 +0800
From:   Su <suyanjun218@...il.com>
To:     Marc Kleine-Budde <mkl@...gutronix.de>
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

The sizeof(u32) is hardcoded. IMO it's better to use the config value in 
regmap.

Thanks

在 2021/1/21 下午5:21, Marc Kleine-Budde 写道:
> 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
>