From 37aa8318ed437000c1b046e663407a138ed47a2c Mon Sep 17 00:00:00 2001 From: Ran Wang Date: Mon, 23 Nov 2020 10:57:15 +0800 Subject: [PATCH] spi: spi-nxp-fspi: fix fspi panic by unexpected interrupts [ Upstream commit 71d80563b0760a411cd90a3680536f5d887fff6b ] Given the case that bootloader(such as UEFI)'s FSPI driver might not handle all interrupts before loading kernel, those legacy interrupts would assert immidiately once kernel's FSPI driver enable them. Further, if it was FSPI_INTR_IPCMDDONE, the irq handler nxp_fspi_irq_handler() would call complete(&f->c) to notify others. However, f->c might not be initialized yet at that time, then cause kernel panic. Of cause, we should fix this issue within bootloader. But it would be better to have this pacth to make dirver more robust (by clearing all interrupt status bits before enabling interrupts). Suggested-by: Han Xu Signed-off-by: Ran Wang Link: https://lore.kernel.org/r/20201123025715.14635-1-ran.wang_1@nxp.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-nxp-fspi.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c index 28ae5229f889..efd9e908e224 100644 --- a/drivers/spi/spi-nxp-fspi.c +++ b/drivers/spi/spi-nxp-fspi.c @@ -948,6 +948,7 @@ static int nxp_fspi_probe(struct platform_device *pdev) struct resource *res; struct nxp_fspi *f; int ret; + u32 reg; ctlr = spi_alloc_master(&pdev->dev, sizeof(*f)); if (!ctlr) @@ -974,6 +975,12 @@ static int nxp_fspi_probe(struct platform_device *pdev) goto err_put_ctrl; } + /* Clear potential interrupts */ + reg = fspi_readl(f, f->iobase + FSPI_INTR); + if (reg) + fspi_writel(f, reg, f->iobase + FSPI_INTR); + + /* find the resources - controller memory mapped space */ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fspi_mmap"); f->ahb_addr = devm_ioremap_resource(dev, res);