At Wed, 11 Jul 2007 09:45:29 +0800, Gao, Jonathan wrote: > > Hi, > I am writing a PCM driver on a Soc for 2.6.10 kernel. > The test code I'm using is from alsa-lib-1.0.6rc1/test/pcm.c. > The runtime log gives me like this... > ----------------------------------------------------------------- > open callback: > hw params callback: alloc result = 1, buffer bytes = 4608 > > /* --------- HW params ------------- */ > format = 2, rate = 44100, channels= 2, period_size = 288, > periods = 4, buffer_size = 1152 > > prepare callback > /* --------- Runtime Info ---------- */ > state = 1 (SNDRV_PCM_STATE_SETUP), hw_ptr = 0, appl_ptr = 0, > avail_min = 288 > avail_max = 0, hw_ptr_base = 0, hw_ptr_interrupt = 0 > > trigger callback: START > > Codec Do Copy: > /* --------- Runtime Info ---------- */ > state = 3 (SNDRV_PCM_STATE_RUNNING), hw_ptr = 0, appl_ptr = > 1152, avail_min = 288 > avail_max = 0, hw_ptr_base = 0, hw_ptr_interrupt = 0 > > pointer callback: hw pointer: 288 (return value of pointer callback) > > Codec Do Copy: > /* --------- Runtime Info ---------- */ > state = 3 (SNDRV_PCM_STATE_RUNNING), hw_ptr = 288, appl_ptr = > 1152, avail_min = 288 > avail_max = 288, hw_ptr_base = 0, hw_ptr_interrupt = 288 > > pointer callback: hw pointer: 576 (return value of pointer callback) > > Codec Do Copy: > /* --------- Runtime Info ---------- */ > state = 3 (SNDRV_PCM_STATE_RUNNING), hw_ptr = 576, appl_ptr = > 1152, avail_min = 288 > avail_max = 576, hw_ptr_base = 0, hw_ptr_interrupt = 576 > > pointer callback: hw pointer: 864 (return value of pointer callback) > > Codec Do Copy: > /* --------- Runtime Info ---------- */ > state = 3 (SNDRV_PCM_STATE_RUNNING), hw_ptr = 864, appl_ptr = > 1152, avail_min = 288 > avail_max = 864, hw_ptr_base = 0, hw_ptr_interrupt = 864 > > pointer callback: hw pointer: 0 (return value of pointer callback) > > trigger callback: STOP > prepare callback > /* --------- Runtime Info ---------- */ > state = 4 (SNDRV_PCM_STATE_XRUN), hw_ptr = 1152, appl_ptr = 1152, > avail_min = 288 > avail_max = 1152, hw_ptr_base = 1152, hw_ptr_interrupt = 1152 > ----------------------------------------------------------------- > > The kernel hangs after prepare callback, from strace, I can see a > endless ioctl(4, ..., ...) repeated. > Does anyone have a few pointers on what is going wrong? One good way for debugging such a blocked process is to see the output of alt+sysrq+t. Then you'll see the kernel stack traces of all processes, and check at which point the test program gets stuck. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
