From: Oswald Buddenhagen <oswald.buddenhagen@gmx.de> stable inclusion from stable-v6.6.33 commit 107c893e0a5b9f71dbfa192eed245b99ed344190 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IAD6H2 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ 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> Signed-off-by: Wang Hai <wanghai38@huawei.com> --- sound/pci/emu10k1/io.c | 1 + 1 file changed, 1 insertion(+) diff --git a/sound/pci/emu10k1/io.c b/sound/pci/emu10k1/io.c index 74df2330015f..5cb8acf5b158 100644 --- a/sound/pci/emu10k1/io.c +++ b/sound/pci/emu10k1/io.c @@ -285,6 +285,7 @@ static void snd_emu1010_fpga_write_locked(struct snd_emu10k1 *emu, u32 reg, u32 outw(value, emu->port + A_GPIO); udelay(10); outw(value | 0x80 , emu->port + A_GPIO); /* High bit clocks the value into the fpga. */ + udelay(10); } void snd_emu1010_fpga_write(struct snd_emu10k1 *emu, u32 reg, u32 value) -- 2.17.1