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fpga zynq: Fix incorrect ISR state on bootup

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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 <jgunthorpe@obsidianresearch.com>
Acked-by: Alan Tull <atull@opensource.altera.com>
Acked-by: Moritz Fischer <moritz.fischer@ettus.com>
This commit is contained in:
Jason Gunthorpe 2016-11-21 22:26:45 +00:00 committed by Alan Tull
parent 80baf649c2
commit 340c0c53ea
1 changed files with 10 additions and 7 deletions
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17
drivers/fpga/zynq-fpga.c
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@ -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",