Re: [PATCH 10/18] spi: qup: Fix DMA mode interrupt handling
From: Sricharan R <hidden>
Date: 2017-06-14 07:21:22
Also in:
linux-arm-msm, linux-spi, lkml
Hi Varada, On 6/14/2017 11:22 AM, Varadarajan Narayanan wrote:
quoted hunk ↗ jump to hunk
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);
This does look correct to remove acknowledging the QUP in normal case and do it conditionally only when xfer = NULL.
quoted hunk ↗ jump to hunk
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 {
Is this because in patch #8 that we do not populate the dma callback for v1. If that is done, this should not be required at all, as the complete would be signalled from the dma callback. Regards, Sricharan -- "QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation