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macintosh/adb-iop: Adopt bus reset algorithm from via-macii driver 

This algorithm is slightly shorter and avoids the surprising
adb_iop_start() call in adb_iop_poll().

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b63d56ecb6e75f11a0bf02231f3b2db656a528a3.1590880623.git.fthain@telegraphics.com.au
This commit is contained in:
Finn Thain 2020-05-31 09:17:03 +10:00 committed by Michael Ellerman
parent ff785e179f
commit 303511edb8
1 changed files with 7 additions and 12 deletions
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19
drivers/macintosh/adb-iop.c
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@ -238,24 +238,19 @@ int adb_iop_autopoll(int devs)
void adb_iop_poll(void)
{
if (adb_iop_state == idle)
adb_iop_start();
iop_ism_irq_poll(ADB_IOP);
}
int adb_iop_reset_bus(void)
{
struct adb_request req = {
.reply_expected = 0,
.nbytes = 2,
.data = { ADB_PACKET, 0 },
};
struct adb_request req;
adb_iop_write(&req);
while (!req.complete) {
adb_iop_poll();
schedule();
}
/* Command = 0, Address = ignored */
adb_request(&req, NULL, ADBREQ_NOSEND, 1, ADB_BUSRESET);
adb_iop_send_request(&req, 1);
/* Don't want any more requests during the Global Reset low time. */
mdelay(3);
return 0;
}