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m68k: atari: Fix TT bootup freeze / unexpected (SCU) interrupt messages

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[ Upstream commit f70065a9fd988983b2c693631b801f25a615fc04 ]

Avoid freeze on Atari TT / MegaSTe boot with continuous messages of:

	unexpected interrupt from 112

Which was due to VBL interrupt being enabled in SCU sys mask, but there
being no handler for that any more.

(Bug and fix were first verified on real Atari TT HW by Christian,
 this patch later on in Hatari emulator.)

Fixes: 1fa0b29f3a43f9dd ("fbdev: Kill Atari vblank cursor blinking")
Reported-by: Nicolas Pomarède <npomarede@corp.free.fr>
Closes: https://listengine.tuxfamily.org/lists.tuxfamily.org/hatari-devel/2024/06/msg00016.html
Closes: https://lore.kernel.org/all/9aa793d7-82ed-4fbd-bce5-60810d8a9119@helsinkinet.fi
Tested-by: Christian Zietz <czietz@gmx.net>
Signed-off-by: Eero Tamminen <oak@helsinkinet.fi>
Reviewed-by: Michael Schmitz <schmitzmic@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/20240624144901.5236-1-oak@helsinkinet.fi
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eero Tamminen 2024-06-24 17:49:01 +03:00 committed by Ksawlii
parent 9dbd4e23c9
commit c8c64ae41f
1 changed files with 1 additions and 5 deletions
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6
arch/m68k/atari/ataints.c
View file

@ -302,11 +302,7 @@ void __init atari_init_IRQ(void)
if (ATARIHW_PRESENT(SCU)) { if (ATARIHW_PRESENT(SCU)) {
/* init the SCU if present */ /* init the SCU if present */
tt_scu.sys_mask = 0x10; /* enable VBL (for the cursor) and tt_scu.sys_mask = 0x0; /* disable all interrupts */
* disable HSYNC interrupts (who
* needs them?) MFP and SCC are
* enabled in VME mask
*/
tt_scu.vme_mask = 0x60; /* enable MFP and SCC ints */ tt_scu.vme_mask = 0x60; /* enable MFP and SCC ints */
} else { } else {
/* If no SCU and no Hades, the HSYNC interrupt needs to be /* If no SCU and no Hades, the HSYNC interrupt needs to be