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| author |  Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
| 2024-04-28 11:37:15 +0200 |
|---|---|---|
| committer |  Takashi Iwai <tiwai@suse.de>
| 2024-04-28 11:58:12 +0200 |
| commit | e8289fd3fa65d60cf04dab6f7845eda352c04ea6 (patch) | |
| tree | ab02c44c05377ac438b4b5f9db7c136140ddbb82 /sound | |
| parent | ALSA: emu10k1: use mutex for E-MU FPGA access locking (diff) | |
| download | linux-e8289fd3fa65d60cf04dab6f7845eda352c04ea6.tar.gz linux-e8289fd3fa65d60cf04dab6f7845eda352c04ea6.tar.bz2 linux-e8289fd3fa65d60cf04dab6f7845eda352c04ea6.zip | |
ALSA: emu10k1: fix E-MU dock initialization
A side effect of making the dock monitoring interrupt-driven was that
we'd be very quick to program a freshly connected dock. However, for
unclear reasons, the dock does not work when we do that - despite the
FPGA netlist upload going just fine. We work around this by adding a
delay before programming the dock; for safety, the value is several
times as much as was determined empirically.
Note that a badly timed dock hot-plug would have triggered the problem
even before the referenced commit - but now it would happen 100% instead
of about 3% of the time, thus making it impossible to work around by
re-plugging.
Fixes: fbb64eedf5a3 ("ALSA: emu10k1: make E-MU dock monitoring interrupt-driven")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=218584
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Message-ID: <20240428093716.3198666-6-oswald.buddenhagen@gmx.de>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/pci/emu10k1/emu10k1_main.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sound/pci/emu10k1/emu10k1_main.c b/sound/pci/emu10k1/emu10k1_main.c index 1a2905e8672b..8ccc0178360c 100644 --- a/sound/pci/emu10k1/emu10k1_main.c +++ b/sound/pci/emu10k1/emu10k1_main.c @@ -737,6 +737,12 @@ static void snd_emu1010_load_dock_firmware(struct snd_emu10k1 *emu) u32 tmp, tmp2; int err; + // The docking events clearly arrive prematurely - while the + // Dock's FPGA seems to be successfully programmed, the Dock + // fails to initialize subsequently if we don't give it some + // time to "warm up" here. + msleep(200); + dev_info(emu->card->dev, "emu1010: Loading Audio Dock Firmware\n"); /* Return to Audio Dock programming mode */ snd_emu1010_fpga_write(emu, EMU_HANA_FPGA_CONFIG, |