From 7d3cb0eecda8d19007f0004a3af071ed1bc997b7 Mon Sep 17 00:00:00 2001 From: Ricardo Ribalda Delgado Date: Thu, 13 Aug 2015 16:09:28 +0200 Subject: spi/spi-xilinx: Fix spurious IRQ ACK on irq mode 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 Tested-by: Edward Kigwana Signed-off-by: Ricardo Ribalda Delgado Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman --- drivers/spi/spi-xilinx.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c index 133f53a9c1d4..8a81a692f764 100644 --- a/drivers/spi/spi-xilinx.c +++ b/drivers/spi/spi-xilinx.c @@ -249,19 +249,23 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) 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) { -- cgit v1.2.3