On [mer., 03.04.2013 13:58:36], Wenyou Yang wrote:
> From: Nicolas Ferre <nicolas.fe...@atmel.com>
>
> Will allow to drop the lock during DMA operations.
>
> Replacing non-irqsave versions with irqsave versions of the lock
> to make it correct in both pdc and dmaengine transfer mode
>
> Signed-off-by: Nicolas Ferre <nicolas.fe...@atmel.com>
> Cc: spi-devel-gene...@lists.sourceforge.net
> Cc: linux-kernel@vger.kernel.org
> [wenyou.y...@atmel.com: submit the patch]
> Signed-off-by: Wenyou Yang <wenyou.y...@atmel.com>
> ---
> drivers/spi/spi-atmel.c | 35 +++++++++++++++++++++--------------
> 1 file changed, 21 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
> index 38f8c0d..2df562f 100644
> --- a/drivers/spi/spi-atmel.c
> +++ b/drivers/spi/spi-atmel.c
> @@ -195,6 +195,7 @@ struct atmel_spi_caps {
> */
> struct atmel_spi {
> spinlock_t lock;
> + unsigned long flags;
>
> phys_addr_t phybase;
> void __iomem *regs;
> @@ -333,6 +334,16 @@ static void cs_deactivate(struct atmel_spi *as, struct
> spi_device *spi)
> gpio_set_value(asd->npcs_pin, !active);
> }
>
> +static void atmel_spi_lock(struct atmel_spi *as)
> +{
> + spin_lock_irqsave(&as->lock, as->flags);
> +}
> +
> +static void atmel_spi_unlock(struct atmel_spi *as)
> +{
> + spin_unlock_irqrestore(&as->lock, as->flags);
> +}
> +
> static inline int atmel_spi_xfer_is_last(struct spi_message *msg,
> struct spi_transfer *xfer)
> {
> @@ -569,9 +580,9 @@ atmel_spi_msg_done(struct spi_master *master, struct
> atmel_spi *as,
> "xfer complete: %u bytes transferred\n",
> msg->actual_length);
>
> - spin_unlock(&as->lock);
> + atmel_spi_unlock(as);
> msg->complete(msg->context);
> - spin_lock(&as->lock);
> + atmel_spi_lock(as);
>
> as->current_transfer = NULL;
> as->next_transfer = NULL;
> @@ -594,7 +605,7 @@ atmel_spi_interrupt(int irq, void *dev_id)
> u32 status, pending, imr;
> int ret = IRQ_NONE;
>
> - spin_lock(&as->lock);
> + atmel_spi_lock(as);
>
> xfer = as->current_transfer;
> msg = list_entry(as->queue.next, struct spi_message, queue);
> @@ -697,7 +708,7 @@ atmel_spi_interrupt(int irq, void *dev_id)
> }
> }
>
> - spin_unlock(&as->lock);
> + atmel_spi_unlock(as);
>
> return ret;
> }
> @@ -802,13 +813,11 @@ static int atmel_spi_setup(struct spi_device *spi)
> spi->controller_state = asd;
> gpio_direction_output(npcs_pin, !(spi->mode & SPI_CS_HIGH));
> } else {
> - unsigned long flags;
> -
> - spin_lock_irqsave(&as->lock, flags);
> + atmel_spi_lock(as);
> if (as->stay == spi)
> as->stay = NULL;
> cs_deactivate(as, spi);
> - spin_unlock_irqrestore(&as->lock, flags);
> + atmel_spi_unlock(as);
> }
>
> asd->csr = csr;
> @@ -827,7 +836,6 @@ static int atmel_spi_transfer(struct spi_device *spi,
> struct spi_message *msg)
> {
> struct atmel_spi *as;
> struct spi_transfer *xfer;
> - unsigned long flags;
> struct device *controller = spi->master->dev.parent;
> u8 bits;
> struct atmel_spi_device *asd;
> @@ -892,11 +900,11 @@ static int atmel_spi_transfer(struct spi_device *spi,
> struct spi_message *msg)
> msg->status = -EINPROGRESS;
> msg->actual_length = 0;
>
> - spin_lock_irqsave(&as->lock, flags);
> + atmel_spi_lock(as);
> list_add_tail(&msg->queue, &as->queue);
> if (!as->current_transfer)
> atmel_spi_next_message(spi->master);
> - spin_unlock_irqrestore(&as->lock, flags);
> + atmel_spi_unlock(as);
>
> return 0;
> }
> @@ -906,17 +914,16 @@ static void atmel_spi_cleanup(struct spi_device *spi)
> struct atmel_spi *as = spi_master_get_devdata(spi->master);
> struct atmel_spi_device *asd = spi->controller_state;
> unsigned gpio = (unsigned) spi->controller_data;
> - unsigned long flags;
>
> if (!asd)
> return;
>
> - spin_lock_irqsave(&as->lock, flags);
> + atmel_spi_lock(as);
> if (as->stay == spi) {
> as->stay = NULL;
> cs_deactivate(as, spi);
> }
> - spin_unlock_irqrestore(&as->lock, flags);
> + atmel_spi_unlock(as);
>
> spi->controller_state = NULL;
> gpio_free(gpio);
> --
> 1.7.9.5
>
On sam9g35 with DMA and PIO (3.9-rc5 + device tree patches)
Tested-by: Richard Genoud <richard.gen...@gmail.com>
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