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ASoC: SOF: Intel: hda: Implement get_stream_position (Linear Link Position)

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When the Linear Link Position is not available in firmware SRAM window we
use the host accessible position registers to read it.
The address of the PPLCLLPL/U registers depend on the number of streams
(playback+capture).
At probe time the pplc_addr is calculated for each stream and we can use
it to read the LLP without the need of address re-calculation.

Set the get_stream_position callback in sof_hda_common_ops for all
platforms:
The callback is used for IPC4 delay calculations only but the register is
a generic HDA register, not tied to any specific IPC version.

Cc: stable@vger.kernel.org # 6.8
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://msgid.link/r/20240321130814.4412-5-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Peter Ujfalusi 2024-03-21 15:08:01 +02:00 committed by Mark Brown
parent fe76d2e75a
commit 67b182bea0
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GPG Key ID: 24D68B725D5487D0
3 changed files with 37 additions and 0 deletions
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2
sound/soc/sof/intel/hda-common-ops.c
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@ -57,6 +57,8 @@ struct snd_sof_dsp_ops sof_hda_common_ops = {
.pcm_pointer = hda_dsp_pcm_pointer,
.pcm_ack = hda_dsp_pcm_ack,
.get_stream_position = hda_dsp_get_stream_llp,
/* firmware loading */
.load_firmware = snd_sof_load_firmware_raw,

32
sound/soc/sof/intel/hda-stream.c
View File

@ -1063,3 +1063,35 @@ snd_pcm_uframes_t hda_dsp_stream_get_position(struct hdac_stream *hstream,
return pos;
}
/**
* hda_dsp_get_stream_llp - Retrieve the LLP (Linear Link Position) of the stream
* @sdev: SOF device
* @component: ASoC component
* @substream: PCM substream
*
* Returns the raw Linear Link Position value
*/
u64 hda_dsp_get_stream_llp(struct snd_sof_dev *sdev,
struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct hdac_stream *hstream = substream->runtime->private_data;
struct hdac_ext_stream *hext_stream = stream_to_hdac_ext_stream(hstream);
u32 llp_l, llp_u;
/*
* The pplc_addr have been calculated during probe in
* hda_dsp_stream_init():
* pplc_addr = sdev->bar[HDA_DSP_PP_BAR] +
* SOF_HDA_PPLC_BASE +
* SOF_HDA_PPLC_MULTI * total_stream +
* SOF_HDA_PPLC_INTERVAL * stream_index
*
* Use this pre-calculated address to avoid repeated re-calculation.
*/
llp_l = readl(hext_stream->pplc_addr + AZX_REG_PPLCLLPL);
llp_u = readl(hext_stream->pplc_addr + AZX_REG_PPLCLLPU);
return ((u64)llp_u << 32) | llp_l;
}

3
sound/soc/sof/intel/hda.h
View File

@ -662,6 +662,9 @@ bool hda_dsp_check_stream_irq(struct snd_sof_dev *sdev);
snd_pcm_uframes_t hda_dsp_stream_get_position(struct hdac_stream *hstream,
int direction, bool can_sleep);
u64 hda_dsp_get_stream_llp(struct snd_sof_dev *sdev,
struct snd_soc_component *component,
struct snd_pcm_substream *substream);
struct hdac_ext_stream *
hda_dsp_stream_get(struct snd_sof_dev *sdev, int direction, u32 flags);