ALSA: emu10k1: make E-MU FPGA writes potentially more reliable

ALSA: emu10k1: make E-MU FPGA writes potentially more reliable

[ Upstream commit 15c7e87aa88f0ab2d51c2e2123b127a6d693ca21 ]

We did not delay after the second strobe signal, so another immediately
following access could potentially corrupt the written value.

This is a purely speculative fix with no supporting evidence, but after
taking out the spinlocks around the writes, it seems plausible that a
modern processor could be actually too fast. Also, it's just cleaner to
be consistent.

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Message-ID: <20240428093716.3198666-7-oswald.buddenhagen@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>