linux-kernel - Re: [PATCH] spi: ti-qspi: use 128 bit transfer mode for writing to flash

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Date:	Tue, 25 Aug 2015 12:24:53 +0530
From:	Vignesh R <vigneshr@...com>
To:	Mark Brown <broonie@...nel.org>
CC:	"linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [PATCH] spi: ti-qspi: use 128 bit transfer mode for writing to
 flash



On 08/20/2015 11:25 PM, Mark Brown wrote:
> On Thu, Aug 20, 2015 at 04:00:59PM +0530, Vignesh R wrote:
> 
>> -			writeb(*txbuf, qspi->base + QSPI_SPI_DATA_REG);
>> +			if (count >= QSPI_WLEN_MAX_BYTES) {
>> +				u32 *txp = (u32 *)txbuf;
>> +
>> +				data = cpu_to_be32(*txp++);
>> +				writel(data, qspi->base +
>> +				       QSPI_SPI_DATA_REG_3);
>> +				data = cpu_to_be32(*txp++);
>> +				writel(data, qspi->base +
>> +				       QSPI_SPI_DATA_REG_2);
>> +				data = cpu_to_be32(*txp++);
>> +				writel(data, qspi->base +
>> +				       QSPI_SPI_DATA_REG_1);
>> +				data = cpu_to_be32(*txp++);
>> +				writel(data, qspi->base +
>> +				       QSPI_SPI_DATA_REG);
>> +				xfer_len = QSPI_WLEN_MAX_BYTES;
>> +				cmd |= QSPI_WLEN(QSPI_WLEN_MAX_BITS);
>> +			} else {
>> +				writeb(*txbuf, qspi->base + QSPI_SPI_DATA_REG);
>> +				cmd = qspi->cmd | QSPI_WR_SNGL;
>> +				xfer_len = wlen;
>> +				cmd |= QSPI_WLEN(wlen);
>> +			}
> 
> It's a bit sad that this isn't able to do a Duff's device type thing and
> only kicks in for the full 128 bit FIFO size, it looks like it could do
> any number of words.
> 

Yes, any number of bytes can be transfered (max 16 bytes).
I will try to work on your suggestion. Thanks!

-- 
Regards
Vignesh
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