From 340c0c53ea3073107d5bb7a61f3158e50bf189e0 Mon Sep 17 00:00:00 2001 From: Jason Gunthorpe Date: Mon, 21 Nov 2016 22:26:45 +0000 Subject: fpga zynq: Fix incorrect ISR state on bootup It is best practice to clear and mask all interrupts before associating the IRQ, and this should be done after the clock is enabled. This corrects a bad result from zynq_fpga_ops_state on bootup where left over latched values in INT_STS_OFFSET caused it to report an unconfigured FPGA as configured. After this change the boot up operating state for an unconfigured FPGA reports 'unknown'. Signed-off-by: Jason Gunthorpe Acked-by: Alan Tull Acked-by: Moritz Fischer --- drivers/fpga/zynq-fpga.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) (limited to 'drivers/fpga/zynq-fpga.c') diff --git a/drivers/fpga/zynq-fpga.c b/drivers/fpga/zynq-fpga.c index bc8e3ec2b134..1812bf7614e1 100644 --- a/drivers/fpga/zynq-fpga.c +++ b/drivers/fpga/zynq-fpga.c @@ -437,13 +437,6 @@ static int zynq_fpga_probe(struct platform_device *pdev) return priv->irq; } - err = devm_request_irq(dev, priv->irq, zynq_fpga_isr, 0, - dev_name(dev), priv); - if (err) { - dev_err(dev, "unable to request IRQ\n"); - return err; - } - priv->clk = devm_clk_get(dev, "ref_clk"); if (IS_ERR(priv->clk)) { dev_err(dev, "input clock not found\n"); @@ -459,6 +452,16 @@ static int zynq_fpga_probe(struct platform_device *pdev) /* unlock the device */ zynq_fpga_write(priv, UNLOCK_OFFSET, UNLOCK_MASK); + zynq_fpga_write(priv, INT_MASK_OFFSET, 0xFFFFFFFF); + zynq_fpga_write(priv, INT_STS_OFFSET, IXR_ALL_MASK); + err = devm_request_irq(dev, priv->irq, zynq_fpga_isr, 0, dev_name(dev), + priv); + if (err) { + dev_err(dev, "unable to request IRQ\n"); + clk_disable_unprepare(priv->clk); + return err; + } + clk_disable(priv->clk); err = fpga_mgr_register(dev, "Xilinx Zynq FPGA Manager", -- cgit v1.2.1