mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-02 23:27:06 +00:00
Code Issues Releases Wiki Activity

ALSA: firewire-motu: refactoring protocol v2 for fetching mode switch

Browse source 
This commit splits the method to switch fetching mode for protocol
version 2 so that model-dependent operations are explicitly defined.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20200519111641.123211-15-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2020-05-19 20:16:41 +09:00 committed by Takashi Iwai
parent 7b47c0d719
commit 506ad56a59
1 changed files with 53 additions and 36 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

89
sound/firewire/motu/motu-protocol-v2.c
View file

@ -170,52 +170,69 @@ int snd_motu_protocol_v2_get_clock_source(struct snd_motu *motu,
return get_clock_source(motu, be32_to_cpu(reg), src);
}
// Expected for Traveler and 896HD, which implements Altera Cyclone EP1C3.
static int switch_fetching_mode_cyclone(struct snd_motu *motu, u32 *data,
bool enable)
{
*data |= V2_CLOCK_MODEL_SPECIFIC;
return 0;
}
// For UltraLite and 8pre, which implements Xilinx Spartan XC3S200.
static int switch_fetching_mode_spartan(struct snd_motu *motu, u32 *data,
bool enable)
{
unsigned int rate;
enum snd_motu_clock_source src;
int err;
err = get_clock_source(motu, *data, &src);
if (err < 0)
return err;
err = get_clock_rate(*data, &rate);
if (err < 0)
return err;
if (src == SND_MOTU_CLOCK_SOURCE_SPH && rate > 48000)
*data |= V2_CLOCK_MODEL_SPECIFIC;
return 0;
}
int snd_motu_protocol_v2_switch_fetching_mode(struct snd_motu *motu,
bool enable)
{
enum snd_motu_clock_source src;
__be32 reg;
u32 data;
int err = 0;
// 828mkII implements Altera ACEX 1K EP1K30. Nothing to do.
if (motu->spec == &snd_motu_spec_828mk2)
if (motu->spec == &snd_motu_spec_828mk2) {
// 828mkII implements Altera ACEX 1K EP1K30. Nothing to do.
return 0;
err = snd_motu_transaction_read(motu, V2_CLOCK_STATUS_OFFSET, &reg,
sizeof(reg));
if (err < 0)
return err;
data = be32_to_cpu(reg);
err = get_clock_source(motu, data, &src);
if (err < 0)
return err;
data &= ~(V2_CLOCK_FETCH_ENABLE | V2_CLOCK_MODEL_SPECIFIC);
if (enable)
data |= V2_CLOCK_FETCH_ENABLE;
if (motu->spec == &snd_motu_spec_traveler) {
// Expected for Traveler and 896HD, which implements Altera
// Cyclone EP1C3.
data |= V2_CLOCK_MODEL_SPECIFIC;
} else {
// For UltraLite and 8pre, which implements Xilinx Spartan
// XC3S200.
unsigned int rate;
__be32 reg;
u32 data;
int err;
err = get_clock_rate(data, &rate);
err = snd_motu_transaction_read(motu, V2_CLOCK_STATUS_OFFSET,
&reg, sizeof(reg));
if (err < 0)
return err;
data = be32_to_cpu(reg);
data &= ~(V2_CLOCK_FETCH_ENABLE | V2_CLOCK_MODEL_SPECIFIC);
if (enable)
data |= V2_CLOCK_FETCH_ENABLE;
if (motu->spec == &snd_motu_spec_traveler)
err = switch_fetching_mode_cyclone(motu, &data, enable);
else
err = switch_fetching_mode_spartan(motu, &data, enable);
if (err < 0)
return err;
if (src == SND_MOTU_CLOCK_SOURCE_SPH && rate > 48000)
data |= V2_CLOCK_MODEL_SPECIFIC;
reg = cpu_to_be32(data);
return snd_motu_transaction_write(motu, V2_CLOCK_STATUS_OFFSET,
&reg, sizeof(reg));
}
reg = cpu_to_be32(data);
return snd_motu_transaction_write(motu, V2_CLOCK_STATUS_OFFSET, &reg,
sizeof(reg));
}
static int detect_packet_formats_828mk2(struct snd_motu *motu, u32 data)