Hi Dirk,
On Wed, Sep 6, 2017 at 9:05 AM, Dirk Behme <[email protected]> wrote:
> From: Hiromitsu Yamasaki <[email protected]>
>
> When Tx DMA is only used, Tx FIFO is still not empty after DMA callback.
> This patch waits for sweeping data out of the Tx FIFO.
>
> Signed-off-by: Hiromitsu Yamasaki <[email protected]>
> [adjust context]
> Signed-off-by: Dirk Behme <[email protected]>
> ---
> drivers/spi/spi-sh-msiof.c | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
> index 660b03ed6770..a960e8da123d 100644
> --- a/drivers/spi/spi-sh-msiof.c
> +++ b/drivers/spi/spi-sh-msiof.c
> @@ -638,6 +638,17 @@ static int sh_msiof_wait_for_completion(struct
> sh_msiof_spi_priv *p,
> dev_err(&p->pdev->dev, "Tx DMA timeout\n");
> return -ETIMEDOUT;
> }
> + if (!rx) {
May the issue also happen is TX and RX are used?
See also "[PATCH 4/8] spi: sh-msiof: Fix DMA completion".
> + sh_msiof_write(p, IER, IER_TEOFE);
> +
> + /* wait for tx fifo to be emptied */
> + if (!wait_for_completion_timeout(&p->done,
> + HZ)) {
> + dev_err(&p->pdev->dev,
> + "Tx fifo to be emptied timeout\n");
> + return -ETIMEDOUT;
> + }
> + }
> }
> if (rx) {
> if (!wait_for_completion_timeout(&p->done_dma_rx,
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
