had_write_register(intelhaddata, AUD_CNTL_ST, ctrl_state.regval);
}
-/*
- * Programs buffer address and length registers
- * This function programs ring buffer address and length into registers.
- */
-static int snd_intelhad_prog_buffer(struct snd_pcm_substream *substream,
- struct snd_intelhad *intelhaddata,
- int start, int end)
-{
- u32 ring_buf_addr, ring_buf_size, period_bytes;
- u8 i, num_periods;
-
- ring_buf_addr = substream->runtime->dma_addr;
- ring_buf_size = snd_pcm_lib_buffer_bytes(substream);
- intelhaddata->stream_info.ring_buf_size = ring_buf_size;
- period_bytes = frames_to_bytes(substream->runtime,
- substream->runtime->period_size);
- num_periods = substream->runtime->periods;
-
- /*
- * buffer addr should be 64 byte aligned, period bytes
- * will be used to calculate addr offset
- */
- period_bytes &= ~0x3F;
-
- /* Hardware supports MAX_PERIODS buffers */
- if (end >= HAD_MAX_PERIODS)
- return -EINVAL;
-
- for (i = start; i <= end; i++) {
- /* Program the buf registers with addr and len */
- intelhaddata->buf_info[i].buf_addr = ring_buf_addr +
- (i * period_bytes);
- if (i < num_periods-1)
- intelhaddata->buf_info[i].buf_size = period_bytes;
- else
- intelhaddata->buf_info[i].buf_size = ring_buf_size -
- (i * period_bytes);
-
- had_write_register(intelhaddata,
- AUD_BUF_A_ADDR + (i * HAD_REG_WIDTH),
- intelhaddata->buf_info[i].buf_addr |
- BIT(0) | BIT(1));
- had_write_register(intelhaddata,
- AUD_BUF_A_LENGTH + (i * HAD_REG_WIDTH),
- period_bytes);
- intelhaddata->buf_info[i].is_valid = true;
- }
- dev_dbg(intelhaddata->dev, "%s:buf[%d-%d] addr=%#x and size=%d\n",
- __func__, start, end,
- intelhaddata->buf_info[start].buf_addr,
- intelhaddata->buf_info[start].buf_size);
- intelhaddata->valid_buf_cnt = num_periods;
- return 0;
-}
-
-static int snd_intelhad_read_len(struct snd_intelhad *intelhaddata)
-{
- int i, retval = 0;
- u32 len[4];
-
- for (i = 0; i < 4 ; i++) {
- had_read_register(intelhaddata,
- AUD_BUF_A_LENGTH + (i * HAD_REG_WIDTH),
- &len[i]);
- if (!len[i])
- retval++;
- }
- if (retval != 1) {
- for (i = 0; i < 4 ; i++)
- dev_dbg(intelhaddata->dev, "buf[%d] size=%d\n",
- i, len[i]);
- }
-
- return retval;
-}
-
static int had_calculate_maud_value(u32 aud_samp_freq, u32 link_rate)
{
u32 maud_val;
return 0;
}
+/*
+ * PCM ring buffer handling
+ *
+ * The hardware provides a ring buffer with the fixed 4 buffer descriptors
+ * (BDs). The driver maps these 4 BDs onto the PCM ring buffer. The mapping
+ * moves at each period elapsed. The below illustrates how it works:
+ *
+ * At time=0
+ * PCM | 0 | 1 | 2 | 3 | 4 | 5 | .... |n-1|
+ * BD | 0 | 1 | 2 | 3 |
+ *
+ * At time=1 (period elapsed)
+ * PCM | 0 | 1 | 2 | 3 | 4 | 5 | .... |n-1|
+ * BD | 1 | 2 | 3 | 0 |
+ *
+ * At time=2 (second period elapsed)
+ * PCM | 0 | 1 | 2 | 3 | 4 | 5 | .... |n-1|
+ * BD | 2 | 3 | 0 | 1 |
+ *
+ * The bd_head field points to the index of the BD to be read. It's also the
+ * position to be filled at next. The pcm_head and the pcm_filled fields
+ * point to the indices of the current position and of the next position to
+ * be filled, respectively. For PCM buffer there are both _head and _filled
+ * because they may be difference when nperiods > 4. For example, in the
+ * example above at t=1, bd_head=1 and pcm_head=1 while pcm_filled=5:
+ *
+ * pcm_head (=1) --v v-- pcm_filled (=5)
+ * PCM | 0 | 1 | 2 | 3 | 4 | 5 | .... |n-1|
+ * BD | 1 | 2 | 3 | 0 |
+ * bd_head (=1) --^ ^-- next to fill (= bd_head)
+ *
+ * For nperiods < 4, the remaining BDs out of 4 are marked as invalid, so that
+ * the hardware skips those BDs in the loop.
+ */
+
+#define AUD_BUF_ADDR(x) (AUD_BUF_A_ADDR + (x) * HAD_REG_WIDTH)
+#define AUD_BUF_LEN(x) (AUD_BUF_A_LENGTH + (x) * HAD_REG_WIDTH)
+
+/* Set up a buffer descriptor at the "filled" position */
+static void had_prog_bd(struct snd_pcm_substream *substream,
+ struct snd_intelhad *intelhaddata)
+{
+ int idx = intelhaddata->bd_head;
+ int ofs = intelhaddata->pcmbuf_filled * intelhaddata->period_bytes;
+ u32 addr = substream->runtime->dma_addr + ofs;
+
+ addr |= AUD_BUF_VALID | AUD_BUF_INTR_EN;
+ had_write_register(intelhaddata, AUD_BUF_ADDR(idx), addr);
+ had_write_register(intelhaddata, AUD_BUF_LEN(idx),
+ intelhaddata->period_bytes);
+
+ /* advance the indices to the next */
+ intelhaddata->bd_head++;
+ intelhaddata->bd_head %= intelhaddata->num_bds;
+ intelhaddata->pcmbuf_filled++;
+ intelhaddata->pcmbuf_filled %= substream->runtime->periods;
+}
+
+/* invalidate a buffer descriptor with the given index */
+static void had_invalidate_bd(struct snd_intelhad *intelhaddata,
+ int idx)
+{
+ had_write_register(intelhaddata, AUD_BUF_ADDR(idx), 0);
+ had_write_register(intelhaddata, AUD_BUF_LEN(idx), 0);
+}
+
+/* Initial programming of ring buffer */
+static void had_init_ringbuf(struct snd_pcm_substream *substream,
+ struct snd_intelhad *intelhaddata)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int i, num_periods;
+
+ num_periods = runtime->periods;
+ intelhaddata->num_bds = min(num_periods, HAD_NUM_OF_RING_BUFS);
+ intelhaddata->period_bytes =
+ frames_to_bytes(runtime, runtime->period_size);
+ WARN_ON(intelhaddata->period_bytes & 0x3f);
+
+ intelhaddata->bd_head = 0;
+ intelhaddata->pcmbuf_head = 0;
+ intelhaddata->pcmbuf_filled = 0;
+
+ for (i = 0; i < HAD_NUM_OF_RING_BUFS; i++) {
+ if (i < num_periods)
+ had_prog_bd(substream, intelhaddata);
+ else /* invalidate the rest */
+ had_invalidate_bd(intelhaddata, i);
+ }
+
+ intelhaddata->bd_head = 0; /* reset at head again before starting */
+}
+
+/* process a bd, advance to the next */
+static void had_advance_ringbuf(struct snd_pcm_substream *substream,
+ struct snd_intelhad *intelhaddata)
+{
+ int num_periods = substream->runtime->periods;
+
+ /* reprogram the next buffer */
+ had_prog_bd(substream, intelhaddata);
+
+ /* proceed to next */
+ intelhaddata->pcmbuf_head++;
+ intelhaddata->pcmbuf_head %= num_periods;
+}
+
+/* process the current BD(s);
+ * returns the current PCM buffer byte position, or -EPIPE for underrun.
+ */
+static int had_process_ringbuf(struct snd_pcm_substream *substream,
+ struct snd_intelhad *intelhaddata)
+{
+ int len, processed;
+ unsigned long flags;
+
+ processed = 0;
+ spin_lock_irqsave(&intelhaddata->had_spinlock, flags);
+ for (;;) {
+ /* get the remaining bytes on the buffer */
+ had_read_register(intelhaddata,
+ AUD_BUF_LEN(intelhaddata->bd_head),
+ &len);
+ if (len < 0 || len > intelhaddata->period_bytes) {
+ dev_dbg(intelhaddata->dev, "Invalid buf length %d\n",
+ len);
+ len = -EPIPE;
+ goto out;
+ }
+
+ if (len > 0) /* OK, this is the current buffer */
+ break;
+
+ /* len=0 => already empty, check the next buffer */
+ if (++processed >= intelhaddata->num_bds) {
+ len = -EPIPE; /* all empty? - report underrun */
+ goto out;
+ }
+ had_advance_ringbuf(substream, intelhaddata);
+ }
+
+ len = intelhaddata->period_bytes - len;
+ len += intelhaddata->period_bytes * intelhaddata->pcmbuf_head;
+ out:
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flags);
+ return len;
+}
+
+/* called from irq handler */
+static void had_process_buffer_done(struct snd_intelhad *intelhaddata)
+{
+ struct snd_pcm_substream *substream;
+
+ if (!intelhaddata->connected)
+ return; /* disconnected? - bail out */
+
+ substream = had_substream_get(intelhaddata);
+ if (!substream)
+ return; /* no stream? - bail out */
+
+ /* process or stop the stream */
+ if (had_process_ringbuf(substream, intelhaddata) < 0)
+ snd_pcm_stop_xrun(substream);
+ else
+ snd_pcm_period_elapsed(substream);
+
+ had_substream_put(intelhaddata);
+}
+
#define MAX_CNT 0xFF
-static void snd_intelhad_handle_underrun(struct snd_intelhad *intelhaddata)
+/*
+ * The interrupt status 'sticky' bits might not be cleared by
+ * setting '1' to that bit once...
+ */
+static void wait_clear_underrun_bit(struct snd_intelhad *intelhaddata)
+{
+ int i;
+ u32 val;
+
+ for (i = 0; i < MAX_CNT; i++) {
+ /* clear bit30, 31 AUD_HDMI_STATUS */
+ had_read_register(intelhaddata, AUD_HDMI_STATUS, &val);
+ if (!(val & AUD_CONFIG_MASK_UNDERRUN))
+ return;
+ had_write_register(intelhaddata, AUD_HDMI_STATUS, val);
+ }
+ dev_err(intelhaddata->dev, "Unable to clear UNDERRUN bits\n");
+}
+
+/* called from irq handler */
+static void had_process_buffer_underrun(struct snd_intelhad *intelhaddata)
{
- u32 hdmi_status = 0, i = 0;
+ struct snd_pcm_substream *substream;
/* Handle Underrun interrupt within Audio Unit */
had_write_register(intelhaddata, AUD_CONFIG, 0);
/* Reset buffer pointers */
had_reset_audio(intelhaddata);
- /*
- * The interrupt status 'sticky' bits might not be cleared by
- * setting '1' to that bit once...
- */
- do { /* clear bit30, 31 AUD_HDMI_STATUS */
- had_read_register(intelhaddata, AUD_HDMI_STATUS,
- &hdmi_status);
- dev_dbg(intelhaddata->dev, "HDMI status =0x%x\n", hdmi_status);
- if (hdmi_status & AUD_CONFIG_MASK_UNDERRUN) {
- i++;
- had_write_register(intelhaddata,
- AUD_HDMI_STATUS, hdmi_status);
- } else
- break;
- } while (i < MAX_CNT);
- if (i >= MAX_CNT)
- dev_err(intelhaddata->dev, "Unable to clear UNDERRUN bits\n");
+
+ wait_clear_underrun_bit(intelhaddata);
+
+ if (!intelhaddata->connected)
+ return; /* disconnected? - bail out */
+
+ /* Report UNDERRUN error to above layers */
+ substream = had_substream_get(intelhaddata);
+ if (substream) {
+ snd_pcm_stop_xrun(substream);
+ had_substream_put(intelhaddata);
+ }
}
/*
intelhaddata->stream_info.substream_refcount++;
spin_unlock_irq(&intelhaddata->had_spinlock);
- /* these are cleared in prepare callback, but just to be sure */
- intelhaddata->curr_buf = 0;
- intelhaddata->underrun_count = 0;
- intelhaddata->stream_info.buffer_rendered = 0;
-
return retval;
error:
pm_runtime_put(intelhaddata->dev);
dev_dbg(intelhaddata->dev, "rate=%d\n", runtime->rate);
dev_dbg(intelhaddata->dev, "channels=%d\n", runtime->channels);
- intelhaddata->curr_buf = 0;
- intelhaddata->underrun_count = 0;
- intelhaddata->stream_info.buffer_rendered = 0;
-
/* Get N value in KHz */
disp_samp_freq = intelhaddata->tmds_clock_speed;
retval = had_init_audio_ctrl(substream, intelhaddata);
/* Prog buffer address */
- retval = snd_intelhad_prog_buffer(substream, intelhaddata,
- HAD_BUF_TYPE_A, HAD_BUF_TYPE_D);
+ had_init_ringbuf(substream, intelhaddata);
/*
* Program channel mapping in following order:
static snd_pcm_uframes_t had_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_intelhad *intelhaddata;
- u32 bytes_rendered = 0;
- u32 t;
- int buf_id;
+ int len;
intelhaddata = snd_pcm_substream_chip(substream);
if (!intelhaddata->connected)
return SNDRV_PCM_POS_XRUN;
- /* Use a hw register to calculate sub-period position reports.
- * This makes PulseAudio happier.
- */
-
- buf_id = intelhaddata->curr_buf % 4;
- had_read_register(intelhaddata,
- AUD_BUF_A_LENGTH + (buf_id * HAD_REG_WIDTH), &t);
-
- if ((t == 0) || (t == ((u32)-1L))) {
- intelhaddata->underrun_count++;
- dev_dbg(intelhaddata->dev,
- "discovered buffer done for buf %d, count = %d\n",
- buf_id, intelhaddata->underrun_count);
-
- if (intelhaddata->underrun_count > (HAD_MIN_PERIODS/2)) {
- dev_dbg(intelhaddata->dev,
- "assume audio_codec_reset, underrun = %d - do xrun\n",
- intelhaddata->underrun_count);
- return SNDRV_PCM_POS_XRUN;
- }
- } else {
- /* Reset Counter */
- intelhaddata->underrun_count = 0;
- }
-
- t = intelhaddata->buf_info[buf_id].buf_size - t;
-
- if (intelhaddata->stream_info.buffer_rendered)
- div_u64_rem(intelhaddata->stream_info.buffer_rendered,
- intelhaddata->stream_info.ring_buf_size,
- &(bytes_rendered));
-
- return bytes_to_frames(substream->runtime, bytes_rendered + t);
+ len = had_process_ringbuf(substream, intelhaddata);
+ if (len < 0)
+ return SNDRV_PCM_POS_XRUN;
+ return bytes_to_frames(substream->runtime, len);
}
/*
return retval;
}
-static inline int had_chk_intrmiss(struct snd_intelhad *intelhaddata,
- enum intel_had_aud_buf_type buf_id)
-{
- int i, intr_count = 0;
- enum intel_had_aud_buf_type buff_done;
- u32 buf_size, buf_addr;
-
- buff_done = buf_id;
-
- intr_count = snd_intelhad_read_len(intelhaddata);
- if (intr_count > 1) {
- /* In case of active playback */
- dev_err(intelhaddata->dev,
- "Driver detected %d missed buffer done interrupt(s)\n",
- (intr_count - 1));
- if (intr_count > 3)
- return intr_count;
-
- buf_id += (intr_count - 1);
- /* Reprogram registers*/
- for (i = buff_done; i < buf_id; i++) {
- int j = i % 4;
-
- buf_size = intelhaddata->buf_info[j].buf_size;
- buf_addr = intelhaddata->buf_info[j].buf_addr;
- had_write_register(intelhaddata,
- AUD_BUF_A_LENGTH +
- (j * HAD_REG_WIDTH), buf_size);
- had_write_register(intelhaddata,
- AUD_BUF_A_ADDR+(j * HAD_REG_WIDTH),
- (buf_addr | BIT(0) | BIT(1)));
- }
- buf_id = buf_id % 4;
- intelhaddata->buff_done = buf_id;
- }
-
- return intr_count;
-}
-
-/* called from irq handler */
-static int had_process_buffer_done(struct snd_intelhad *intelhaddata)
-{
- u32 len = 1;
- enum intel_had_aud_buf_type buf_id;
- enum intel_had_aud_buf_type buff_done;
- struct pcm_stream_info *stream;
- struct snd_pcm_substream *substream;
- u32 buf_size;
- int intr_count;
- unsigned long flags;
-
- stream = &intelhaddata->stream_info;
- intr_count = 1;
-
- spin_lock_irqsave(&intelhaddata->had_spinlock, flags);
- if (!intelhaddata->connected) {
- spin_unlock_irqrestore(&intelhaddata->had_spinlock, flags);
- dev_dbg(intelhaddata->dev,
- "%s:Device already disconnected\n", __func__);
- return 0;
- }
- buf_id = intelhaddata->curr_buf;
- intelhaddata->buff_done = buf_id;
- buff_done = intelhaddata->buff_done;
- buf_size = intelhaddata->buf_info[buf_id].buf_size;
-
- /* Every debug statement has an implication
- * of ~5msec. Thus, avoid having >3 debug statements
- * for each buffer_done handling.
- */
-
- /* Check for any intr_miss in case of active playback */
- if (stream->running) {
- intr_count = had_chk_intrmiss(intelhaddata, buf_id);
- if (!intr_count || (intr_count > 3)) {
- spin_unlock_irqrestore(&intelhaddata->had_spinlock,
- flags);
- dev_err(intelhaddata->dev,
- "HAD SW state in non-recoverable mode\n");
- return 0;
- }
- buf_id += (intr_count - 1);
- buf_id = buf_id % 4;
- }
-
- intelhaddata->buf_info[buf_id].is_valid = true;
- if (intelhaddata->valid_buf_cnt-1 == buf_id) {
- if (stream->running)
- intelhaddata->curr_buf = HAD_BUF_TYPE_A;
- } else
- intelhaddata->curr_buf = buf_id + 1;
-
- spin_unlock_irqrestore(&intelhaddata->had_spinlock, flags);
-
- if (!intelhaddata->connected) {
- dev_dbg(intelhaddata->dev, "HDMI cable plugged-out\n");
- return 0;
- }
-
- /* Reprogram the registers with addr and length */
- had_write_register(intelhaddata,
- AUD_BUF_A_LENGTH + (buf_id * HAD_REG_WIDTH),
- buf_size);
- had_write_register(intelhaddata,
- AUD_BUF_A_ADDR + (buf_id * HAD_REG_WIDTH),
- intelhaddata->buf_info[buf_id].buf_addr |
- BIT(0) | BIT(1));
-
- had_read_register(intelhaddata,
- AUD_BUF_A_LENGTH + (buf_id * HAD_REG_WIDTH),
- &len);
- dev_dbg(intelhaddata->dev, "%s:Enabled buf[%d]\n", __func__, buf_id);
-
- /* In case of actual data,
- * report buffer_done to above ALSA layer
- */
- substream = had_substream_get(intelhaddata);
- if (substream) {
- buf_size = intelhaddata->buf_info[buf_id].buf_size;
- intelhaddata->stream_info.buffer_rendered +=
- (intr_count * buf_size);
- snd_pcm_period_elapsed(substream);
- had_substream_put(intelhaddata);
- }
-
- return 0;
-}
-
-/* called from irq handler */
-static int had_process_buffer_underrun(struct snd_intelhad *intelhaddata)
-{
- enum intel_had_aud_buf_type buf_id;
- struct pcm_stream_info *stream;
- struct snd_pcm_substream *substream;
- unsigned long flags;
- int connected;
-
- stream = &intelhaddata->stream_info;
-
- spin_lock_irqsave(&intelhaddata->had_spinlock, flags);
- buf_id = intelhaddata->curr_buf;
- intelhaddata->buff_done = buf_id;
- connected = intelhaddata->connected;
- if (stream->running)
- intelhaddata->curr_buf = HAD_BUF_TYPE_A;
-
- spin_unlock_irqrestore(&intelhaddata->had_spinlock, flags);
-
- dev_dbg(intelhaddata->dev, "Enter:%s buf_id=%d, stream_running=%d\n",
- __func__, buf_id, stream->running);
-
- snd_intelhad_handle_underrun(intelhaddata);
-
- if (!connected) {
- dev_dbg(intelhaddata->dev,
- "%s:Device already disconnected\n", __func__);
- return 0;
- }
-
- /* Report UNDERRUN error to above layers */
- substream = had_substream_get(intelhaddata);
- if (substream) {
- snd_pcm_stop_xrun(substream);
- had_substream_put(intelhaddata);
- }
-
- return 0;
-}
-
/* process hot plug, called from wq with mutex locked */
static void had_process_hot_plug(struct snd_intelhad *intelhaddata)
{
- enum intel_had_aud_buf_type buf_id;
struct snd_pcm_substream *substream;
spin_lock_irq(&intelhaddata->had_spinlock);
return;
}
- buf_id = intelhaddata->curr_buf;
- intelhaddata->buff_done = buf_id;
intelhaddata->connected = true;
dev_dbg(intelhaddata->dev,
"%s @ %d:DEBUG PLUG/UNPLUG : HAD_DRV_CONNECTED\n",
__func__, __LINE__);
spin_unlock_irq(&intelhaddata->had_spinlock);
- dev_dbg(intelhaddata->dev, "Processing HOT_PLUG, buf_id = %d\n",
- buf_id);
-
/* Safety check */
substream = had_substream_get(intelhaddata);
if (substream) {
/* process hot unplug, called from wq with mutex locked */
static void had_process_hot_unplug(struct snd_intelhad *intelhaddata)
{
- enum intel_had_aud_buf_type buf_id;
struct snd_pcm_substream *substream;
- buf_id = intelhaddata->curr_buf;
-
substream = had_substream_get(intelhaddata);
spin_lock_irq(&intelhaddata->had_spinlock);
dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
- /* allocate dma pages for ALSA stream operations
- * memory allocated is based on size, not max value
- * thus using same argument for max & size
+ /* allocate dma pages;
+ * try to allocate 600k buffer as default which is large enough
*/
snd_pcm_lib_preallocate_pages_for_all(pcm,
SNDRV_DMA_TYPE_DEV, NULL,
- HAD_MAX_BUFFER, HAD_MAX_BUFFER);
+ HAD_DEFAULT_BUFFER, HAD_MAX_BUFFER);
/* create controls */
for (i = 0; i < ARRAY_SIZE(had_controls); i++) {
projects / platform / kernel / linux-rpi.git / commitdiff