From: Oswald Buddenhagen Date: Sun, 28 Apr 2024 09:37:16 +0000 (+0200) Subject: ALSA: emu10k1: make E-MU FPGA writes potentially more reliable X-Git-Tag: v6.9-rc7~17^2~7 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=15c7e87aa88f0ab2d51c2e2123b127a6d693ca21;p=linux-block.git ALSA: emu10k1: make E-MU FPGA writes potentially more reliable 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 Signed-off-by: Takashi Iwai Message-ID: <20240428093716.3198666-7-oswald.buddenhagen@gmx.de> --- diff --git a/sound/pci/emu10k1/io.c b/sound/pci/emu10k1/io.c index f3260a81e47b..f4a1c2d4b078 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)