This is a note to let you know that I've just added the patch titled
spi/spi-xilinx: Fix spurious IRQ ACK on irq mode
to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-spi-xilinx-fix-spurious-irq-ack-on-irq-mode.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 74346841e6f5df5f7b83d5904435d273c507dba6 Mon Sep 17 00:00:00 2001
From: Ricardo Ribalda Delgado <[email protected]>
Date: Thu, 13 Aug 2015 16:09:28 +0200
Subject: spi/spi-xilinx: Fix spurious IRQ ACK on irq mode
From: Ricardo Ribalda Delgado <[email protected]>
commit 74346841e6f5df5f7b83d5904435d273c507dba6 upstream.
The ACK of an inexistent IRQ can trigger an spurious IRQ that breaks the
txrx logic. This has been observed on axi_quad_spi:3.2 core.
This patch only ACKs IRQs that have not been Acknowledge jet.
Reported-by: Edward Kigwana <[email protected]>
Tested-by: Edward Kigwana <[email protected]>
Signed-off-by: Ricardo Ribalda Delgado <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/spi/spi-xilinx.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -249,19 +249,23 @@ static int xilinx_spi_txrx_bufs(struct s
xspi->tx_ptr = t->tx_buf;
xspi->rx_ptr = t->rx_buf;
remaining_words = t->len / xspi->bytes_per_word;
- reinit_completion(&xspi->done);
if (xspi->irq >= 0 && remaining_words > xspi->buffer_size) {
+ u32 isr;
use_irq = true;
- xspi->write_fn(XSPI_INTR_TX_EMPTY,
- xspi->regs + XIPIF_V123B_IISR_OFFSET);
- /* Enable the global IPIF interrupt */
- xspi->write_fn(XIPIF_V123B_GINTR_ENABLE,
- xspi->regs + XIPIF_V123B_DGIER_OFFSET);
/* Inhibit irq to avoid spurious irqs on tx_empty*/
cr = xspi->read_fn(xspi->regs + XSPI_CR_OFFSET);
xspi->write_fn(cr | XSPI_CR_TRANS_INHIBIT,
xspi->regs + XSPI_CR_OFFSET);
+ /* ACK old irqs (if any) */
+ isr = xspi->read_fn(xspi->regs + XIPIF_V123B_IISR_OFFSET);
+ if (isr)
+ xspi->write_fn(isr,
+ xspi->regs + XIPIF_V123B_IISR_OFFSET);
+ /* Enable the global IPIF interrupt */
+ xspi->write_fn(XIPIF_V123B_GINTR_ENABLE,
+ xspi->regs + XIPIF_V123B_DGIER_OFFSET);
+ reinit_completion(&xspi->done);
}
while (remaining_words) {
Patches currently in stable-queue which might be from [email protected]
are
queue-4.2/spi-spi-xilinx-fix-mixed-poll-irq-mode.patch
queue-4.2/spi-spi-xilinx-fix-spurious-irq-ack-on-irq-mode.patch
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