linux-kernel - Re: [spi-devel-general] [PATCH] spi/spi_s3c64xx: Warn if PIO transfers time out

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Date:	Tue, 24 Aug 2010 09:06:40 +0900
From:	Jassi Brar <jassisinghbrar@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	David Brownell <dbrownell@...rs.sourceforge.net>,
	Grant Likely <grant.likely@...retlab.ca>,
	spi-devel-general@...ts.sourceforge.net,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: Re: [spi-devel-general] [PATCH] spi/spi_s3c64xx: Warn if PIO
 transfers time out

On Tue, Aug 24, 2010 at 1:40 AM, Mark Brown
<broonie@...nsource.wolfsonmicro.com> wrote:
> When using PIO we have a timeout for the TX and RX FIFOs to ensure that
> the data actually gets transferred. Warn if we hit that timeout - it
> should never happen, but this makes sure we'll find out if it does.
>
> Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> ---
>  drivers/spi/spi_s3c64xx.c |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/spi/spi_s3c64xx.c b/drivers/spi/spi_s3c64xx.c
> index 7e627f7..f72e1c0 100644
> --- a/drivers/spi/spi_s3c64xx.c
> +++ b/drivers/spi/spi_s3c64xx.c
> @@ -200,6 +200,9 @@ static void flush_fifo(struct s3c64xx_spi_driver_data *sdd)
>                val = readl(regs + S3C64XX_SPI_STATUS);
>        } while (TX_FIFO_LVL(val, sci) && loops--);
>
> +       if (loops == 0)
> +               dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n");
> +
>        /* Flush RxFIFO*/
>        loops = msecs_to_loops(1);
>        do {
> @@ -210,6 +213,9 @@ static void flush_fifo(struct s3c64xx_spi_driver_data *sdd)
>                        break;
>        } while (loops--);
>
> +       if (loops == 0)
> +               dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n");
> +
>        val = readl(regs + S3C64XX_SPI_CH_CFG);
>        val &= ~S3C64XX_SPI_CH_SW_RST;
>        writel(val, regs + S3C64XX_SPI_CH_CFG);

Ok, though I'll be very surprised to see the FIFO flush failing. We
are not waiting
for data to be transferred, but for SW Reset to make its effect.

Acked-by: Jassi Brar <jassi.brar@...sung.com>
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