m68k/irq - Use polled IRQ flag for MFP timer cascaded interrupts

Some Atari hardware has no capacity to raise interrupts (e.g. network or USB adapter hardware attached via ROM port). The driver interrupt routine is called from a timer interrupt (timer D) in these cases, using chained device specific pseudo interrupts (IRQ_MFP_TIMER1 ff.) These interrupts will more often than not, return IRQ_NONE as there is not always work for the device handler when called. Too many unhandled interrupts will result in the interrupt being disabled by the stuck interrupt watchdog. As preferred option to flag interrupts as needing exclusion from the watchdog mechanism, tglx added the IRQ_IS_POLLED flag for use in such a case. Currently, two interrupts need to use this flag. Add more users as needed. Signed-off-by: Michael Schmitz <schmitz@debian.org> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

m68k/irq - Use polled IRQ flag for MFP timer cascaded interrupts
Some Atari hardware has no capacity to raise interrupts (e.g. network or USB adapter hardware attached via ROM port). The driver interrupt routine is called from a timer interrupt (timer D) in these cases, using chained device specific pseudo interrupts (IRQ_MFP_TIMER1 ff.) These interrupts will more often than not, return IRQ_NONE as there is not always work for the device handler when called. Too many unhandled interrupts will result in the interrupt being disabled by the stuck interrupt watchdog. As preferred option to flag interrupts as needing exclusion from the watchdog mechanism, tglx added the IRQ_IS_POLLED flag for use in such a case. Currently, two interrupts need to use this flag. Add more users as needed. Signed-off-by: Michael Schmitz <schmitz@debian.org> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Michael Schmitz · Geert Uytterhoeven
1 parent a16f9a42a5
Showing 1 changed file with 3 additions and 0 deletions Side-by-side Diff
arch/m68k/atari/ataints.c
@@ -333,6 +333,9 @@
 	m68k_setup_irq_controller(&atari_mfptimer_chip, handle_simple_irq,
 				  IRQ_MFP_TIMER1, 8);
  
+	irq_set_status_flags(IRQ_MFP_TIMER1, IRQ_IS_POLLED);
+	irq_set_status_flags(IRQ_MFP_TIMER2, IRQ_IS_POLLED);
+
 	/* prepare timer D data for use as poll interrupt */
 	/* set Timer D data Register - needs to be > 0 */
 	st_mfp.tim_dt_d = 254;	/* < 100 Hz */
...	...	@@ -333,6 +333,9 @@
333	333	m68k_setup_irq_controller(&atari_mfptimer_chip, handle_simple_irq,
334	334	IRQ_MFP_TIMER1, 8);
335	335
	336	+ irq_set_status_flags(IRQ_MFP_TIMER1, IRQ_IS_POLLED);
	337	+ irq_set_status_flags(IRQ_MFP_TIMER2, IRQ_IS_POLLED);
	338	+
336	339	/* prepare timer D data for use as poll interrupt */
337	340	/* set Timer D data Register - needs to be > 0 */
338	341	st_mfp.tim_dt_d = 254; /* < 100 Hz */