Re: [PATCH 1/1] ARM: spi supports 32bytes buffer for DUAL and QUAD

["Niklas Söderlund" <niklas.soderlund-1zkq55x86MTxsAP9Fp7wbw@public.gmane.org>]

Hi Cao,

On 2016-11-04 17:38:54 +0900, Cao Minh Hiep wrote:
> From: Hiep Cao Minh <cm-hiep-HEF513clHfp3+QwDJ9on6Q@public.gmane.org>
> 
> This patch supports 32bytes of buffer for DUAL and QUAD in QSPI by
> Using Transmit/Receive Buffer Data Triggering Number.
> In order to improve the DUAL and QUAD's performance of SPI 
> while transferring data in PIO mode, it sends/receives each 32bytes 
> data instead of each byte data as current situation.
> 
> Signed-off-by: Hiep Cao Minh <cm-hiep-HEF513clHfp3+QwDJ9on6Q@public.gmane.org>
> ---
>  drivers/spi/spi-rspi.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 49 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
> index a816f07..fb12bc5 100644
> --- a/drivers/spi/spi-rspi.c
> +++ b/drivers/spi/spi-rspi.c
> @@ -413,7 +413,7 @@ static unsigned int qspi_set_send_trigger(struct rspi_data *rspi,
>  	return n;
>  }
>  
> -static void qspi_set_receive_trigger(struct rspi_data *rspi, unsigned int len)
> +static int qspi_set_receive_trigger(struct rspi_data *rspi, unsigned int len)
>  {
>  	unsigned int n;
>  
> @@ -428,6 +428,7 @@ static void qspi_set_receive_trigger(struct rspi_data *rspi, unsigned int len)
>  		qspi_update(rspi, SPBFCR_RXTRG_MASK,
>  			     SPBFCR_RXTRG_1B, QSPI_SPBFCR);
>  	}
> +	return n;
>  }
>  
>  #define set_config_register(spi, n) spi->ops->set_config_register(spi, n)
> @@ -514,6 +515,51 @@ static int rspi_pio_transfer(struct rspi_data *rspi, const u8 *tx, u8 *rx,
>  	return 0;
>  }
>  
> +static int rspi_pio_transfer_in_or_our(struct rspi_data *rspi, const u8 *tx,
> +				       u8 *rx, unsigned int n)

Nitpicking, s/rspi_pio_transfer_in_or_our/rspi_pio_transfer_in_or_out/ 
or am I missing something?

> +{
> +	unsigned int i, len;
> +	int ret;
> +
> +	while (n > 0) {
> +		if (tx) {
> +			len = qspi_set_send_trigger(rspi, n);
> +			if (len == QSPI_BUFFER_SIZE) {
> +				ret = rspi_wait_for_tx_empty(rspi);
> +				if (ret < 0) {
> +					dev_err(&rspi->master->dev, "transmit timeout\n");
> +					return ret;
> +				}
> +				for (i = 0; i < len; i++)
> +					rspi_write_data(rspi, *tx++);
> +			} else {
> +				ret = rspi_pio_transfer(rspi, tx, NULL, n);
> +				if (ret < 0)
> +					return ret;
> +			}
> +		}
> +		if (rx) {
> +			len = qspi_set_receive_trigger(rspi, n);
> +			if (len == QSPI_BUFFER_SIZE) {
> +				ret = rspi_wait_for_rx_full(rspi);
> +				if (ret < 0) {
> +					dev_err(&rspi->master->dev, "receive timeout\n");
> +					return ret;
> +				}
> +				for (i = 0; i < len; i++)
> +					*rx++ = rspi_read_data(rspi);
> +			} else {
> +				ret = rspi_pio_transfer(rspi, NULL, rx, n);
> +				if (ret < 0)
> +					return ret;
> +				*rx++ = ret;
> +			}
> +		}
> +		n -= len;
> +	}
> +	return 0;
> +}
> +
>  static void rspi_dma_complete(void *arg)
>  {
>  	struct rspi_data *rspi = arg;
> @@ -793,7 +839,7 @@ static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer)
>  			return ret;
>  	}
>  
> -	ret = rspi_pio_transfer(rspi, xfer->tx_buf, NULL, xfer->len);
> +	ret = rspi_pio_transfer_in_or_our(rspi, xfer->tx_buf, NULL, xfer->len);
>  	if (ret < 0)
>  		return ret;
>  
> @@ -811,7 +857,7 @@ static int qspi_transfer_in(struct rspi_data *rspi, struct spi_transfer *xfer)
>  			return ret;
>  	}
>  
> -	return rspi_pio_transfer(rspi, NULL, xfer->rx_buf, xfer->len);
> +	return rspi_pio_transfer_in_or_our(rspi, NULL, xfer->rx_buf, xfer->len);
>  }
>  
>  static int qspi_transfer_one(struct spi_master *master, struct spi_device *spi,
> -- 
> 1.9.1
> 

-- 
Regards,
Niklas Söderlund
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