[PATCH v2] spi:spi_bfin5xx: SPI SSEL deasserted too early in soft irq mode.

[PATCH v2] spi:spi_bfin5xx: SPI SSEL deasserted too early in soft irq mode.

[Sonic Zhang]

From: Sonic Zhang <sonic.zhang@analog.com>

Poll the FIFO till it is empty before deassert SSEL in pump_transfers in
soft irq mode. No polling is necessary in interrupt mode and error handling.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
---
 drivers/spi/spi-bfin5xx.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/spi/spi-bfin5xx.c b/drivers/spi/spi-bfin5xx.c
index b8d25f2..7e03e7d 100644
--- a/drivers/spi/spi-bfin5xx.c
+++ b/drivers/spi/spi-bfin5xx.c
@@ -587,6 +587,7 @@ static void bfin_spi_pump_transfers(unsigned long data)
 	if (message->state == DONE_STATE) {
 		dev_dbg(&drv_data->pdev->dev, "transfer: all done!\n");
 		message->status = 0;
+		bfin_spi_flush(drv_data);
 		bfin_spi_giveback(drv_data);
 		return;
 	}
@@ -870,8 +871,10 @@ static void bfin_spi_pump_transfers(unsigned long data)
 		message->actual_length += drv_data->len_in_bytes;
 		/* Move to next transfer of this msg */
 		message->state = bfin_spi_next_transfer(drv_data);
-		if (drv_data->cs_change)
+		if (drv_data->cs_change) {
+			bfin_spi_flush(drv_data);
 			bfin_spi_cs_deactive(drv_data, chip);
+		}
 	}
 
 	/* Schedule next transfer tasklet */
-- 
1.7.0.4

Re: [PATCH v2] spi:spi_bfin5xx: SPI SSEL deasserted too early in soft irq mode.

[Sonic Zhang]

Hi Grant,

Any comments?


Sonic Zhang

On Fri, Aug 12, 2011 at 10:48 AM, Sonic Zhang <sonic.adi@gmail.com> wrote:
> From: Sonic Zhang <sonic.zhang@analog.com>
>
> Poll the FIFO till it is empty before deassert SSEL in pump_transfers in
> soft irq mode. No polling is necessary in interrupt mode and error handling.
>
> Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
> ---
>  drivers/spi/spi-bfin5xx.c |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/spi/spi-bfin5xx.c b/drivers/spi/spi-bfin5xx.c
> index b8d25f2..7e03e7d 100644
> --- a/drivers/spi/spi-bfin5xx.c
> +++ b/drivers/spi/spi-bfin5xx.c
> @@ -587,6 +587,7 @@ static void bfin_spi_pump_transfers(unsigned long data)
>        if (message->state == DONE_STATE) {
>                dev_dbg(&drv_data->pdev->dev, "transfer: all done!\n");
>                message->status = 0;
> +               bfin_spi_flush(drv_data);
>                bfin_spi_giveback(drv_data);
>                return;
>        }
> @@ -870,8 +871,10 @@ static void bfin_spi_pump_transfers(unsigned long data)
>                message->actual_length += drv_data->len_in_bytes;
>                /* Move to next transfer of this msg */
>                message->state = bfin_spi_next_transfer(drv_data);
> -               if (drv_data->cs_change)
> +               if (drv_data->cs_change) {
> +                       bfin_spi_flush(drv_data);
>                        bfin_spi_cs_deactive(drv_data, chip);
> +               }
>        }
>
>        /* Schedule next transfer tasklet */
> --
> 1.7.0.4
>
>
> --
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Re: [uclinux-dist-devel] [PATCH v2] spi:spi_bfin5xx: SPI SSEL deasserted too early in soft irq mode.

[Barry Song]

2011/8/12 Sonic Zhang <sonic.adi@gmail.com>:
> From: Sonic Zhang <sonic.zhang@analog.com>
>
> Poll the FIFO till it is empty before deassert SSEL in pump_transfers in
> soft irq mode. No polling is necessary in interrupt mode and error handling.
>
> Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>

Acked-by: Barry Song <21cnbao@gmail.com>

it is actually making sure the last message is finished.

> ---
>  drivers/spi/spi-bfin5xx.c |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/spi/spi-bfin5xx.c b/drivers/spi/spi-bfin5xx.c
> index b8d25f2..7e03e7d 100644
> --- a/drivers/spi/spi-bfin5xx.c
> +++ b/drivers/spi/spi-bfin5xx.c
> @@ -587,6 +587,7 @@ static void bfin_spi_pump_transfers(unsigned long data)
>        if (message->state == DONE_STATE) {
>                dev_dbg(&drv_data->pdev->dev, "transfer: all done!\n");
>                message->status = 0;
> +               bfin_spi_flush(drv_data);
>                bfin_spi_giveback(drv_data);
>                return;
>        }
> @@ -870,8 +871,10 @@ static void bfin_spi_pump_transfers(unsigned long data)
>                message->actual_length += drv_data->len_in_bytes;
>                /* Move to next transfer of this msg */
>                message->state = bfin_spi_next_transfer(drv_data);
> -               if (drv_data->cs_change)
> +               if (drv_data->cs_change) {
> +                       bfin_spi_flush(drv_data);
>                        bfin_spi_cs_deactive(drv_data, chip);
> +               }
>        }
>
>        /* Schedule next transfer tasklet */
> --
> 1.7.0.4
>
>
> _______________________________________________
> Uclinux-dist-devel mailing list
> Uclinux-dist-devel@blackfin.uclinux.org
> https://blackfin.uclinux.org/mailman/listinfo/uclinux-dist-devel

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