[PATCH 10/18] spi: qup: Fix DMA mode interrupt handling
From: Varadarajan Narayanan <hidden>
Date: 2017-06-14 05:53:55
Also in:
linux-arm-msm, linux-spi, lkml
Subsystem:
arm/qualcomm mailing list, spi subsystem, the rest · Maintainers:
Mark Brown, Linus Torvalds
This is needed for v1, where the i/o completion is not handled in the dma driver. Signed-off-by: Andy Gross <redacted> Signed-off-by: Varadarajan Narayanan <redacted> --- 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);
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation