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Commit a4f508b2 authored by Clemens Ladisch's avatar Clemens Ladisch Committed by Jaroslav Kysela
Browse files

[ALSA] rtctimer: add option to make RTC timer the default sequencer timer 



ALSA Core,ALSA sequencer
Add an option to make the RTC timer the default sequencer timer.  This
becomes necessary for precise MIDI timing when the system timer runs at
less than 1000 Hz.

Signed-off-by: default avatarClemens Ladisch <clemens@ladisch.de>
parent 43bcd973

sound/core/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -99,6 +99,18 @@ config SND_RTCTIMER 
	  To compile this driver as a module, choose M here: the module

	  will be called snd-rtctimer.



config SND_SEQ_RTCTIMER_DEFAULT

	bool "Use RTC as default sequencer timer"

	depends on SND_RTCTIMER && SND_SEQUENCER

	default y

	help

	  Say Y here to use the RTC timer as the default sequencer

	  timer.  This is strongly recommended because it ensures

	  precise MIDI timing even when the system timer runs at less

	  than 1000 Hz.



	  If in doubt, say Y.



config SND_VERBOSE_PRINTK

	bool "Verbose printk"

	depends on SND

sound/core/seq/seq.c

+7 −1
Original line number Diff line number Diff line
@@ -43,7 +43,13 @@ int seq_client_load[64] = {[0 ... 63] = -1}; 
int seq_default_timer_class = SNDRV_TIMER_CLASS_GLOBAL;

int seq_default_timer_sclass = SNDRV_TIMER_SCLASS_NONE;

int seq_default_timer_card = -1;

int seq_default_timer_device = SNDRV_TIMER_GLOBAL_SYSTEM;

int seq_default_timer_device =

#ifdef CONFIG_SND_SEQ_RTCTIMER_DEFAULT

	SNDRV_TIMER_GLOBAL_RTC

#else

	SNDRV_TIMER_GLOBAL_SYSTEM

#endif

	;

int seq_default_timer_subdevice = 0;

int seq_default_timer_resolution = 0;	/* Hz */