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Finn Thain 78448034fa m68k: mac: Fix IOP status/control register writes 
[ Upstream commit 931fc82a6a ]

When writing values to the IOP status/control register make sure those
values do not have any extraneous bits that will clear interrupt flags.

To place the SCC IOP into bypass mode would be desirable but this is not
achieved by writing IOP_DMAINACTIVE | IOP_RUN | IOP_AUTOINC | IOP_BYPASS
to the control register. Drop this ineffective register write.

Remove the flawed and unused iop_bypass() function. Make use of the
unused iop_stop() function.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Stan Johnson <userm57@yahoo.com>
Cc: Joshua Thompson <funaho@jurai.org>
Link: https://lore.kernel.org/r/09bcb7359a1719a18b551ee515da3c4c3cf709e6.1590880333.git.fthain@telegraphics.com.au
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2020-08-19 08:15:56 +02:00
..
Makefile
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baboon.c
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config.c m68k: mac: Don't call via_flush_cache() on Mac IIfx 2020-06-22 09:31:08 +02:00
iop.c m68k: mac: Fix IOP status/control register writes 2020-08-19 08:15:56 +02:00
mac_penguin.S
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macboing.c
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macints.c
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misc.c
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oss.c
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psc.c
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via.c m68k: mac: Don't call via_flush_cache() on Mac IIfx 2020-06-22 09:31:08 +02:00