[PATCH 10/18] spi: qup: Fix DMA mode interrupt handling

Varadarajan Narayanan
2017-06-14T05:53:55Z

This is needed for v1, where the i/o completion is not
handled in the dma driver.

Signed-off-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Varadarajan Narayanan <varada@codeaurora.org>
---
drivers/spi/spi-qup.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index 872de28..bd53e82 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -510,9 +510,9 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)

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) {
+ writel_relaxed(opflags, controller->base + QUP_OPERATIONAL);
dev_err_ratelimited(controller->dev, "unexpected irq %08x %08x %08x\n",
qup_err, spi_err, opflags);
return IRQ_HANDLED;
@@ -540,7 +540,15 @@ 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);
+ if (opflags & QUP_OP_IN_SERVICE_FLAG &&
+ opflags & QUP_OP_MAX_INPUT_DONE_FLAG)
+ complete(&controller->rxc);
+ if (opflags & QUP_OP_OUT_SERVICE_FLAG &&
+ opflags & QUP_OP_MAX_OUTPUT_DONE_FLAG)
+ complete(&controller->txc);
+ } else {
if (opflags & QUP_OP_IN_SERVICE_FLAG)
spi_qup_read(controller, xfer);

@@ -553,6 +561,9 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
controller->xfer = xfer;
spin_unlock_irqrestore(&controller->lock, flags);

+ /* re-read opflags as flags may have changed due to actions above */
+ opflags = readl_relaxed(controller->base + QUP_OPERATIONAL);
+
if ((controller->rx_bytes == xfer->len &&
(opflags & QUP_OP_MAX_INPUT_DONE_FLAG)) || error)
complete(&controller->done);