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ASoC: SOF: Intel: export hda_sdw_bpt_get_buf_size_aligment 

The dma buffer need to be a multiple of data block size and
the fifo size. Export a function to return the LCM of data
block size and the fifo size.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://patch.msgid.link/20251014031450.3781789-6-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
master
Bard Liao 2025-10-14 11:14:48 +08:00 committed by Vinod Koul
parent 57b3a7b27e
commit 167efc6dfd
2 changed files with 20 additions and 0 deletions
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7
include/sound/hda-sdw-bpt.h
View File

@ -30,6 +30,8 @@ int hda_sdw_bpt_wait(struct device *dev, struct hdac_ext_stream *bpt_tx_stream,
int hda_sdw_bpt_close(struct device *dev, struct hdac_ext_stream *bpt_tx_stream,
struct snd_dma_buffer *dmab_tx_bdl, struct hdac_ext_stream *bpt_rx_stream,
struct snd_dma_buffer *dmab_rx_bdl);
unsigned int hda_sdw_bpt_get_buf_size_alignment(unsigned int dma_bandwidth);
#else
static inline int hda_sdw_bpt_open(struct device *dev, int link_id,
struct hdac_ext_stream **bpt_tx_stream,
@ -64,6 +66,11 @@ static inline int hda_sdw_bpt_close(struct device *dev, struct hdac_ext_stream *
WARN_ONCE(1, "SoundWire BPT is disabled");
return -EOPNOTSUPP;
}
static inline unsigned int hda_sdw_bpt_get_buf_size_alignment(unsigned int dma_bandwidth)
{
return 0;
}
#endif
#endif /* __HDA_SDW_BPT_H */

13
sound/soc/sof/intel/hda-sdw-bpt.c
View File

@ -10,6 +10,7 @@
* Hardware interface for SoundWire BPT support with HDA DMA
*/
#include <linux/lcm.h>
#include <sound/hdaudio_ext.h>
#include <sound/hda-mlink.h>
#include <sound/hda-sdw-bpt.h>
@ -236,6 +237,18 @@ static int hda_sdw_bpt_dma_disable(struct device *dev, struct hdac_ext_stream *s
return ret;
}
#define FIFO_ALIGNMENT 64
unsigned int hda_sdw_bpt_get_buf_size_alignment(unsigned int dma_bandwidth)
{
unsigned int num_channels = DIV_ROUND_UP(dma_bandwidth, BPT_FREQUENCY * 32);
unsigned int data_block = num_channels * 4;
unsigned int alignment = lcm(data_block, FIFO_ALIGNMENT);
return alignment;
}
EXPORT_SYMBOL_NS(hda_sdw_bpt_get_buf_size_alignment, "SND_SOC_SOF_INTEL_HDA_SDW_BPT");
int hda_sdw_bpt_open(struct device *dev, int link_id, struct hdac_ext_stream **bpt_tx_stream,
struct snd_dma_buffer *dmab_tx_bdl, u32 bpt_tx_num_bytes,
u32 tx_dma_bandwidth, struct hdac_ext_stream **bpt_rx_stream,