Commit d14f291b authored by Heiner Kallweit's avatar Heiner Kallweit Committed by Mauro Carvalho Chehab

[media] media: rc: nuvoton: ignore spurious interrupt when logical device is being disabled

When removing module nuvoton-cir I get a fifo overrun warning.
It turned out to be caused by a spurious interrupt when the logical CIR
device is being disabled (although no interrupt source bit being set).
Reading the interrupt status register returns 0xff, therefore the fifo
overrun bit is mistakenly interpreted as being set.

Fix this by ignoring interrupts when interrupt source and status register
reads return 0xff.
Signed-off-by: default avatarHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 033919e0
...@@ -886,6 +886,15 @@ static irqreturn_t nvt_cir_isr(int irq, void *data) ...@@ -886,6 +886,15 @@ static irqreturn_t nvt_cir_isr(int irq, void *data)
status = nvt_cir_reg_read(nvt, CIR_IRSTS); status = nvt_cir_reg_read(nvt, CIR_IRSTS);
iren = nvt_cir_reg_read(nvt, CIR_IREN); iren = nvt_cir_reg_read(nvt, CIR_IREN);
/* At least NCT6779D creates a spurious interrupt when the
* logical device is being disabled.
*/
if (status == 0xff && iren == 0xff) {
spin_unlock_irqrestore(&nvt->nvt_lock, flags);
nvt_dbg_verbose("Spurious interrupt detected");
return IRQ_HANDLED;
}
/* IRQ may be shared with CIR WAKE, therefore check for each /* IRQ may be shared with CIR WAKE, therefore check for each
* status bit whether the related interrupt source is enabled * status bit whether the related interrupt source is enabled
*/ */
......
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