This is an implementation of PCM streaming with only 1 period. Since the hardware requires the refresh of BDs after each BD processing finishes, we'd need at least two BDs. The trick is that both BDs point to the same content: the address of the PCM buffer head, and the whole buffer size. Then it loops over to the whole buffer again after it finished once.
Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/x86/intel_hdmi_audio.c | 9 ++++++++- sound/x86/intel_hdmi_lpe_audio.h | 2 +- 2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/sound/x86/intel_hdmi_audio.c b/sound/x86/intel_hdmi_audio.c index 8f87ac3057c6..979b396272ae 100644 --- a/sound/x86/intel_hdmi_audio.c +++ b/sound/x86/intel_hdmi_audio.c @@ -846,6 +846,11 @@ static int had_prog_n(u32 aud_samp_freq, u32 *n_param, * * For nperiods < 4, the remaining BDs out of 4 are marked as invalid, so that * the hardware skips those BDs in the loop. + * + * An exceptional setup is the case with nperiods=1. Since we have to update + * BDs after finishing one BD processing, we'd need at least two BDs, where + * both BDs point to the same content, the same address, the same size of the + * whole PCM buffer. */
#define AUD_BUF_ADDR(x) (AUD_BUF_A_ADDR + (x) * HAD_REG_WIDTH) @@ -888,6 +893,8 @@ static void had_init_ringbuf(struct snd_pcm_substream *substream,
num_periods = runtime->periods; intelhaddata->num_bds = min(num_periods, HAD_NUM_OF_RING_BUFS); + /* set the minimum 2 BDs for num_periods=1 */ + intelhaddata->num_bds = max(intelhaddata->num_bds, 2U); intelhaddata->period_bytes = frames_to_bytes(runtime, runtime->period_size); WARN_ON(intelhaddata->period_bytes & 0x3f); @@ -897,7 +904,7 @@ static void had_init_ringbuf(struct snd_pcm_substream *substream, intelhaddata->pcmbuf_filled = 0;
for (i = 0; i < HAD_NUM_OF_RING_BUFS; i++) { - if (i < num_periods) + if (i < intelhaddata->num_bds) had_prog_bd(substream, intelhaddata); else /* invalidate the rest */ had_invalidate_bd(intelhaddata, i); diff --git a/sound/x86/intel_hdmi_lpe_audio.h b/sound/x86/intel_hdmi_lpe_audio.h index a13a66771f73..195918f1a4ae 100644 --- a/sound/x86/intel_hdmi_lpe_audio.h +++ b/sound/x86/intel_hdmi_lpe_audio.h @@ -31,7 +31,7 @@ #define HAD_MAX_BUFFER ((1024 * 1024 - 1) & ~0x3f) #define HAD_DEFAULT_BUFFER (600 * 1024) /* default prealloc size */ #define HAD_MAX_PERIODS 256 /* arbitrary, but should suffice */ -#define HAD_MIN_PERIODS 2 +#define HAD_MIN_PERIODS 1 #define HAD_MAX_PERIOD_BYTES ((HAD_MAX_BUFFER / HAD_MIN_PERIODS) & ~0x3f) #define HAD_MIN_PERIOD_BYTES 1024 /* might be smaller */ #define HAD_FIFO_SIZE 0 /* fifo not being used */