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authorJason Gunthorpe <jgunthorpe@obsidianresearch.com>2016-11-21 22:26:45 +0000
committerAlan Tull <atull@opensource.altera.com>2016-11-29 15:51:48 -0600
commit340c0c53ea3073107d5bb7a61f3158e50bf189e0 (patch)
treebdabfcaac67ee4ab224aa5993010ddefbf8ba4db /drivers/fpga
parent80baf649c2778bb8900cb9011bc712b89faddbdb (diff)
downloadlinux-340c0c53ea3073107d5bb7a61f3158e50bf189e0.tar.bz2
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 <jgunthorpe@obsidianresearch.com> Acked-by: Alan Tull <atull@opensource.altera.com> Acked-by: Moritz Fischer <moritz.fischer@ettus.com>
Diffstat (limited to 'drivers/fpga')
-rw-r--r--drivers/fpga/zynq-fpga.c17
1 files changed, 10 insertions, 7 deletions
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",