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authorVaradarajan Narayanan <varada@codeaurora.org>2017-07-28 09:52:53 +0300
committerMark Brown <broonie@kernel.org>2017-08-08 14:15:22 +0300
commitce7dfc71c1123a4bc7ddc628fc759ede0f58a2fe (patch)
tree546932c612ef848edab4fd8fe0ed74891a092efb /drivers/spi
parentd9a09a6c0c98d57e5a248c3b9bb10f63d475dfdb (diff)
downloadlinux-ce7dfc71c1123a4bc7ddc628fc759ede0f58a2fe.tar.xz
spi: qup: Fix transaction done signaling
Wait to signal done until we get all of the interrupts we are expecting to get for a transaction. If we don't wait for the input done flag, we can be in between transactions when the done flag comes in and this can mess up the next transaction. While here cleaning up the code which sets controller->xfer = NULL and restores it in the ISR. This looks to be some debug code which is not required. Signed-off-by: Andy Gross <andy.gross@linaro.org> Signed-off-by: Varadarajan Narayanan <varada@codeaurora.org> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-qup.c27
1 files changed, 5 insertions, 22 deletions
diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index ef952946375a..a7c630c4788c 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -409,29 +409,16 @@ static int spi_qup_do_pio(struct spi_master *master, struct spi_transfer *xfer,
static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
{
struct spi_qup *controller = dev_id;
- struct spi_transfer *xfer;
+ struct spi_transfer *xfer = controller->xfer;
u32 opflags, qup_err, spi_err;
- unsigned long flags;
int error = 0;
- spin_lock_irqsave(&controller->lock, flags);
- xfer = controller->xfer;
- controller->xfer = NULL;
- spin_unlock_irqrestore(&controller->lock, flags);
-
qup_err = readl_relaxed(controller->base + QUP_ERROR_FLAGS);
spi_err = readl_relaxed(controller->base + SPI_ERROR_FLAGS);
opflags = readl_relaxed(controller->base + QUP_OPERATIONAL);
writel_relaxed(qup_err, controller->base + QUP_ERROR_FLAGS);
writel_relaxed(spi_err, controller->base + SPI_ERROR_FLAGS);
- writel_relaxed(opflags, controller->base + QUP_OPERATIONAL);
-
- if (!xfer) {
- dev_err_ratelimited(controller->dev, "unexpected irq %08x %08x %08x\n",
- qup_err, spi_err, opflags);
- return IRQ_HANDLED;
- }
if (qup_err) {
if (qup_err & QUP_ERROR_OUTPUT_OVER_RUN)
@@ -455,7 +442,9 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
error = -EIO;
}
- if (!spi_qup_is_dma_xfer(controller->mode)) {
+ if (spi_qup_is_dma_xfer(controller->mode)) {
+ writel_relaxed(opflags, controller->base + QUP_OPERATIONAL);
+ } else {
if (opflags & QUP_OP_IN_SERVICE_FLAG)
spi_qup_fifo_read(controller, xfer);
@@ -463,12 +452,7 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
spi_qup_fifo_write(controller, xfer);
}
- spin_lock_irqsave(&controller->lock, flags);
- controller->error = error;
- controller->xfer = xfer;
- spin_unlock_irqrestore(&controller->lock, flags);
-
- if (controller->rx_bytes == xfer->len || error)
+ if ((opflags & QUP_OP_MAX_INPUT_DONE_FLAG) || error)
complete(&controller->done);
return IRQ_HANDLED;
@@ -666,7 +650,6 @@ static int spi_qup_transfer_one(struct spi_master *master,
exit:
spi_qup_set_state(controller, QUP_STATE_RESET);
spin_lock_irqsave(&controller->lock, flags);
- controller->xfer = NULL;
if (!ret)
ret = controller->error;
spin_unlock_irqrestore(&controller->lock, flags);