67 lines
2.2 KiB
Diff
67 lines
2.2 KiB
Diff
From b69e5e855aaae2dd9f7fc6f4a40af8e6e0cf98ee Mon Sep 17 00:00:00 2001
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From: Matthew McClintock <mmcclint@codeaurora.org>
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Date: Thu, 10 Mar 2016 16:44:55 -0600
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Subject: [PATCH] spi: qup: properly detect extra interrupts
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It's possible for a SPI transaction to complete and get another
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interrupt and have it processed on the same spi_transfer before the
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transfer_one can set it to NULL.
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This masks unexpected interrupts, so let's set the spi_transfer to
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NULL in the interrupt once the transaction is done. So we can
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properly detect these bad interrupts and print warning messages.
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Change-Id: I0e70ed59fb50e5c48a72a38f74bd178b17c9f24d
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Signed-off-by: Matthew McClintock <mmcclint@codeaurora.org>
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---
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drivers/spi/spi-qup.c | 15 +++++++++------
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1 file changed, 9 insertions(+), 6 deletions(-)
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diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
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index e487416..45e30c7 100644
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--- a/drivers/spi/spi-qup.c
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+++ b/drivers/spi/spi-qup.c
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@@ -509,6 +509,7 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
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u32 opflags, qup_err, spi_err;
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unsigned long flags;
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int error = 0;
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+ bool done = 0;
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spin_lock_irqsave(&controller->lock, flags);
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xfer = controller->xfer;
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@@ -567,16 +568,19 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
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spi_qup_write(controller, xfer);
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}
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- spin_lock_irqsave(&controller->lock, flags);
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- controller->error = error;
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- controller->xfer = xfer;
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- spin_unlock_irqrestore(&controller->lock, flags);
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-
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/* re-read opflags as flags may have changed due to actions above */
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opflags = readl_relaxed(controller->base + QUP_OPERATIONAL);
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if ((controller->rx_bytes == xfer->len &&
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(opflags & QUP_OP_MAX_INPUT_DONE_FLAG)) || error)
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+ done = true;
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+
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+ spin_lock_irqsave(&controller->lock, flags);
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+ controller->error = error;
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+ controller->xfer = done ? NULL : xfer;
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+ spin_unlock_irqrestore(&controller->lock, flags);
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+
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+ if (done)
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complete(&controller->done);
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return IRQ_HANDLED;
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@@ -769,7 +773,6 @@ static int spi_qup_transfer_one(struct spi_master *master,
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exit:
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spi_qup_set_state(controller, QUP_STATE_RESET);
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spin_lock_irqsave(&controller->lock, flags);
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- controller->xfer = NULL;
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if (!ret)
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ret = controller->error;
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spin_unlock_irqrestore(&controller->lock, flags);
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--
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2.7.2
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