linux-kernel - Re: [PATCH v2 08/22] mtd: spi-nor: Rework write

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Message-ID: <34fbb0d7-ee8f-a6d7-4a3e-d64f2f8555ff@microchip.com>
Date:   Wed, 23 Oct 2019 23:39:31 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <boris.brezillon@...labora.com>
CC:     <linux-arm-kernel@...ts.infradead.org>, <vigneshr@...com>,
        <geert+renesas@...der.be>, <andrew@...id.au>, <richard@....at>,
        <linux-kernel@...r.kernel.org>, <vz@...ia.com>,
        <marek.vasut@...il.com>, <jonas@...rbonn.se>,
        <linux-mtd@...ts.infradead.org>, <joel@....id.au>,
        <miquel.raynal@...tlin.com>, <matthias.bgg@...il.com>,
        <linux-mediatek@...ts.infradead.org>,
        <computersforpeace@...il.com>, <dwmw2@...radead.org>,
        <linux-aspeed@...ts.ozlabs.org>
Subject: Re: [PATCH v2 08/22] mtd: spi-nor: Rework write_enable/disable()



On 10/10/2019 10:21 AM, Boris Brezillon wrote:
> External E-Mail
> 
> 
> On Tue, 24 Sep 2019 07:46:18 +0000
> <Tudor.Ambarus@...rochip.com> wrote:
> 
>> From: Tudor Ambarus <tudor.ambarus@...rochip.com>
>>
>> static int write_enable(struct spi_nor *nor)
>> static int write_disable(struct spi_nor *nor)
>> become
>> static int spi_nor_write_enable(struct spi_nor *nor)
>> static int spi_nor_write_disable(struct spi_nor *nor)
>>
>> Check for errors after each call to them. Move them up in the
>> file as the first SPI NOR Register Operations, to avoid further
>> forward declarations.
> 
> Same here, split that in 3 patches please.

:)

> 
>>
>> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
>> ---
>>  drivers/mtd/spi-nor/spi-nor.c | 175 +++++++++++++++++++++++++++++-------------
>>  1 file changed, 120 insertions(+), 55 deletions(-)
>>
>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
>> index 0fb124bd2e77..0aee068a5835 100644
>> --- a/drivers/mtd/spi-nor/spi-nor.c
>> +++ b/drivers/mtd/spi-nor/spi-nor.c
>> @@ -389,6 +389,64 @@ static ssize_t spi_nor_write_data(struct spi_nor *nor, loff_t to, size_t len,
>>  }
>>  
>>  /**
>> + * spi_nor_write_enable() - Set write enable latch with Write Enable command.
>> + * @nor:        pointer to 'struct spi_nor'
>> + *
>> + * Return: 0 on success, -errno otherwise.
>> + */
>> +static int spi_nor_write_enable(struct spi_nor *nor)
>> +{
>> +	int ret;
>> +
>> +	if (nor->spimem) {
>> +		struct spi_mem_op op =
>> +			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WREN, 1),
>> +				   SPI_MEM_OP_NO_ADDR,
>> +				   SPI_MEM_OP_NO_DUMMY,
>> +				   SPI_MEM_OP_NO_DATA);
>> +
>> +		ret = spi_mem_exec_op(nor->spimem, &op);
>> +	} else {
>> +		ret = nor->controller_ops->write_reg(nor, SPINOR_OP_WREN,
>> +						     NULL, 0);
>> +	}
>> +
>> +	if (ret)
>> +		dev_err(nor->dev, "error %d on Write Enable\n", ret);
> 
> Do we really need these error messages? I mean, if there's an error it
> should be propagated to the upper layer, so maybe we should use
> dev_dbg() here.
> 

I find them useful. On error conditions, I would like to see what were the
difficulties when interacting with the hardware.