diff options
| author | Oswald Buddenhagen <oswald.buddenhagen@gmx.de> | 2023-04-22 16:24:30 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2023-04-22 18:34:28 +0300 |
| commit | 6fb861bb3caf2ca8e440f7a3fdcca35fcac917b4 (patch) | |
| tree | d0db2ca26573fa8df57f84f6230b49d98b15ced6 /sound | |
| parent | 8b2dd46d9a0370cf092fdd798dd66634abaf03e0 (diff) | |
| download | linux-6fb861bb3caf2ca8e440f7a3fdcca35fcac917b4.tar.xz | |
ALSA: emu10k1: fix snd_emu1010_fpga_read() input masking for rev2 cards
Unlike the Alice2 chips used on 1st generation E-MU cards, the
Tina/Tina2 chips used on the 2nd gen cards have only six GPIN pins,
which means that we need to use a smaller mask. Failure to do so would
falsify the read data if the FPGA tried to raise an IRQ right at that
moment. This wasn't a problem so far, as we didn't actually enable FPGA
IRQs, but that's going to change soon.
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230422132430.1057490-1-oswald.buddenhagen@gmx.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/pci/emu10k1/io.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/sound/pci/emu10k1/io.c b/sound/pci/emu10k1/io.c index f0134689c320..42b06f2e5552 100644 --- a/sound/pci/emu10k1/io.c +++ b/sound/pci/emu10k1/io.c @@ -255,6 +255,9 @@ void snd_emu1010_fpga_write(struct snd_emu10k1 *emu, u32 reg, u32 value) void snd_emu1010_fpga_read(struct snd_emu10k1 *emu, u32 reg, u32 *value) { + // The higest input pin is used as the designated interrupt trigger, + // so it needs to be masked out. + u32 mask = emu->card_capabilities->ca0108_chip ? 0x1f : 0x7f; unsigned long flags; if (snd_BUG_ON(reg > 0x3f)) return; @@ -264,7 +267,7 @@ void snd_emu1010_fpga_read(struct snd_emu10k1 *emu, u32 reg, u32 *value) udelay(10); outw(reg | 0x80, emu->port + A_GPIO); /* High bit clocks the value into the fpga. */ udelay(10); - *value = ((inw(emu->port + A_GPIO) >> 8) & 0x7f); + *value = ((inw(emu->port + A_GPIO) >> 8) & mask); spin_unlock_irqrestore(&emu->emu_lock, flags); } |