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From 543618f5388d487ba88e3d5304c161fc3ccf61d1 Mon Sep 17 00:00:00 2001
From: Matthew McClintock <mmcclint@codeaurora.org>
Date: Thu, 10 Mar 2016 16:44:55 -0600
Subject: [PATCH 10/37] spi: qup: properly detect extra interrupts
It's possible for a SPI transaction to complete and get another
interrupt and have it processed on the same spi_transfer before the
transfer_one can set it to NULL.
This masks unexpected interrupts, so let's set the spi_transfer to
NULL in the interrupt once the transaction is done. So we can
properly detect these bad interrupts and print warning messages.
Signed-off-by: Matthew McClintock <mmcclint@codeaurora.org>
---
drivers/spi/spi-qup.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -507,6 +507,7 @@ static irqreturn_t spi_qup_qup_irq(int i
u32 opflags, qup_err, spi_err;
unsigned long flags;
int error = 0;
+ bool done = 0;
spin_lock_irqsave(&controller->lock, flags);
xfer = controller->xfer;
@@ -565,16 +566,19 @@ static irqreturn_t spi_qup_qup_irq(int i
spi_qup_write(controller, xfer);
}
- spin_lock_irqsave(&controller->lock, flags);
- controller->error = error;
- 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)
+ done = true;
+
+ spin_lock_irqsave(&controller->lock, flags);
+ controller->error = error;
+ controller->xfer = done ? NULL : xfer;
+ spin_unlock_irqrestore(&controller->lock, flags);
+
+ if (done)
complete(&controller->done);
return IRQ_HANDLED;
@@ -767,7 +771,6 @@ static int spi_qup_transfer_one(struct s
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);
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