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Subject: Re: [PATCH v3 2/3] mtd: spi-nor: Move m25p80 code in spi-nor.c
To:     Boris Brezillon <boris.brezillon@collabora.com>
CC:     Miquel Raynal <miquel.raynal@bootlin.com>,
        Richard Weinberger <richard@nod.at>,
        Tudor Ambarus <tudor.ambarus@microchip.com>,
        Marek Vasut <marek.vasut@gmail.com>,
        Boris Brezillon <bbrezillon@kernel.org>,
        <linux-kernel@vger.kernel.org>, <linux-mtd@lists.infradead.org>
References: <20190801043052.30192-1-vigneshr@ti.com>
 <20190801043052.30192-3-vigneshr@ti.com>
 <20190801075205.3336693b@collabora.com>
From:   Vignesh Raghavendra <vigneshr@ti.com>
Message-ID: <2b3ff784-01dc-ce18-2e3c-183f9bee1d09@ti.com>
Date:   Thu, 1 Aug 2019 12:16:20 +0530
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On 01/08/19 11:22 AM, Boris Brezillon wrote:
> On Thu, 1 Aug 2019 10:00:51 +0530
> Vignesh Raghavendra <vigneshr@ti.com> wrote:
> 
>> From: Boris Brezillon <boris.brezillon@bootlin.com>
>>
>> The m25p80 driver is actually a generic wrapper around the spi-mem
>> layer. Not only the driver name is misleading, but we'd expect such a
>> common logic to be directly available in the core. Another reason for
>> moving this code is that SPI NOR controller drivers should
>> progressively be replaced by SPI controller drivers implementing the
>> spi_mem_ops interface, and when the conversion is done, we should have
>> a single spi-nor driver directly interfacing with the spi-mem layer.
>>
>> While moving the code we also fix a longstanding issue when
>> non-DMA-able buffers are passed by the MTD layer.
>>
>> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
>> Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
>> ---
>> v3:
>> Simplify register read/write by dropping spi_nor_exec_op() and using
>> spi_mem_exec_op() directly
>> Modify spi_nor_spimem_xfer_data() to drop "enum spi_nor_protocol proto"
>> Fix misc coding style comments by Tudor
>>
>> v2:
>> Add docs for new functions added
>> Add spi_nor_ prefix to new functions
>> Incorporate Andrey's patches https://lkml.org/lkml/2019/4/1/32
>> to avoid looping spi_nor_spimem_* APIs
>>
>>  drivers/mtd/devices/Kconfig   |  18 -
>>  drivers/mtd/devices/Makefile  |   1 -
>>  drivers/mtd/devices/m25p80.c  | 347 -------------------
>>  drivers/mtd/spi-nor/Kconfig   |   2 +
>>  drivers/mtd/spi-nor/spi-nor.c | 632 ++++++++++++++++++++++++++++++++--
>>  include/linux/mtd/spi-nor.h   |   3 +
>>  6 files changed, 604 insertions(+), 399 deletions(-)
>>  delete mode 100644 drivers/mtd/devices/m25p80.c
>>
> 
> [...]
> 
> 
>> @@ -348,6 +530,16 @@ static int read_cr(struct spi_nor *nor)
>>   */
>>  static int write_sr(struct spi_nor *nor, u8 val)
>>  {
>> +	if (nor->spimem) {
>> +		struct spi_mem_op op =
>> +			SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WRSR, 1),
>> +				   SPI_MEM_OP_NO_ADDR,
>> +				   SPI_MEM_OP_NO_DUMMY,
>> +				   SPI_MEM_OP_DATA_IN(1, nor->bouncebuf, 1));
>> +
>> +		return spi_mem_exec_op(nor->spimem, &op);
>> +	}
>> +
>>  	nor->bouncebuf[0] = val;
> 
> The above line should be moved at the beginning of the function if you
> want the spimem path to work correctly.


Good catch! will send v4 with this fixed


-- 
Regards
Vignesh