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linux/sound/hda/intel-nhlt.c
Pierre-Louis Bossart 72176fccd5
ALSA: hda: intel-nhlt: add intel_nhlt_ssp_mclk_mask() 
SOF topologies hard-code the MCLK used for SSP connections. That was a
bad idea in hindsight, this information should really come from BIOS
and/or machine driver.

This patch introduces a helper to scan all SSP endpoints connected to
a codec, and all formats to see what MCLK is used. When BIT(0) of the
mdivc offset if set in the SSP blob, MCLK0 is used, and likewise when
BIT(1) is set MCLK1 is used.

The case where both MCLKs are used is possible but has never been seen
in practice so should be treated as an error by the caller.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20220919115350.43104-4-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2022-09-20 12:25:03 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
// Copyright (c) 2015-2019 Intel Corporation
#include <linux/acpi.h>
#include <sound/intel-nhlt.h>
struct nhlt_acpi_table *intel_nhlt_init(struct device *dev)
{
struct nhlt_acpi_table *nhlt;
acpi_status status;
status = acpi_get_table(ACPI_SIG_NHLT, 0,
(struct acpi_table_header **)&nhlt);
if (ACPI_FAILURE(status)) {
dev_warn(dev, "NHLT table not found\n");
return NULL;
}
return nhlt;
}
EXPORT_SYMBOL_GPL(intel_nhlt_init);
void intel_nhlt_free(struct nhlt_acpi_table *nhlt)
{
acpi_put_table((struct acpi_table_header *)nhlt);
}
EXPORT_SYMBOL_GPL(intel_nhlt_free);
int intel_nhlt_get_dmic_geo(struct device *dev, struct nhlt_acpi_table *nhlt)
{
struct nhlt_endpoint *epnt;
struct nhlt_dmic_array_config *cfg;
struct nhlt_vendor_dmic_array_config *cfg_vendor;
struct nhlt_fmt *fmt_configs;
unsigned int dmic_geo = 0;
u16 max_ch = 0;
u8 i, j;
if (!nhlt)
return 0;
if (nhlt->header.length <= sizeof(struct acpi_table_header)) {
dev_warn(dev, "Invalid DMIC description table\n");
return 0;
}
for (j = 0, epnt = nhlt->desc; j < nhlt->endpoint_count; j++,
epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length)) {
if (epnt->linktype != NHLT_LINK_DMIC)
continue;
cfg = (struct nhlt_dmic_array_config *)(epnt->config.caps);
fmt_configs = (struct nhlt_fmt *)(epnt->config.caps + epnt->config.size);
/* find max number of channels based on format_configuration */
if (fmt_configs->fmt_count) {
struct nhlt_fmt_cfg *fmt_cfg = fmt_configs->fmt_config;
dev_dbg(dev, "found %d format definitions\n",
fmt_configs->fmt_count);
for (i = 0; i < fmt_configs->fmt_count; i++) {
struct wav_fmt_ext *fmt_ext;
fmt_ext = &fmt_cfg->fmt_ext;
if (fmt_ext->fmt.channels > max_ch)
max_ch = fmt_ext->fmt.channels;
/* Move to the next nhlt_fmt_cfg */
fmt_cfg = (struct nhlt_fmt_cfg *)(fmt_cfg->config.caps +
fmt_cfg->config.size);
}
dev_dbg(dev, "max channels found %d\n", max_ch);
} else {
dev_dbg(dev, "No format information found\n");
}
if (cfg->device_config.config_type != NHLT_CONFIG_TYPE_MIC_ARRAY) {
dmic_geo = max_ch;
} else {
switch (cfg->array_type) {
case NHLT_MIC_ARRAY_2CH_SMALL:
case NHLT_MIC_ARRAY_2CH_BIG:
dmic_geo = MIC_ARRAY_2CH;
break;
case NHLT_MIC_ARRAY_4CH_1ST_GEOM:
case NHLT_MIC_ARRAY_4CH_L_SHAPED:
case NHLT_MIC_ARRAY_4CH_2ND_GEOM:
dmic_geo = MIC_ARRAY_4CH;
break;
case NHLT_MIC_ARRAY_VENDOR_DEFINED:
cfg_vendor = (struct nhlt_vendor_dmic_array_config *)cfg;
dmic_geo = cfg_vendor->nb_mics;
break;
default:
dev_warn(dev, "%s: undefined DMIC array_type 0x%0x\n",
__func__, cfg->array_type);
}
if (dmic_geo > 0) {
dev_dbg(dev, "Array with %d dmics\n", dmic_geo);
}
if (max_ch > dmic_geo) {
dev_dbg(dev, "max channels %d exceed dmic number %d\n",
max_ch, dmic_geo);
}
}
}
dev_dbg(dev, "dmic number %d max_ch %d\n", dmic_geo, max_ch);
return dmic_geo;
}
EXPORT_SYMBOL_GPL(intel_nhlt_get_dmic_geo);
bool intel_nhlt_has_endpoint_type(struct nhlt_acpi_table *nhlt, u8 link_type)
{
struct nhlt_endpoint *epnt;
int i;
if (!nhlt)
return false;
epnt = (struct nhlt_endpoint *)nhlt->desc;
for (i = 0; i < nhlt->endpoint_count; i++) {
if (epnt->linktype == link_type)
return true;
epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length);
}
return false;
}
EXPORT_SYMBOL(intel_nhlt_has_endpoint_type);
int intel_nhlt_ssp_endpoint_mask(struct nhlt_acpi_table *nhlt, u8 device_type)
{
struct nhlt_endpoint *epnt;
int ssp_mask = 0;
int i;
if (!nhlt || (device_type != NHLT_DEVICE_BT && device_type != NHLT_DEVICE_I2S))
return 0;
epnt = (struct nhlt_endpoint *)nhlt->desc;
for (i = 0; i < nhlt->endpoint_count; i++) {
if (epnt->linktype == NHLT_LINK_SSP && epnt->device_type == device_type) {
/* for SSP the virtual bus id is the SSP port */
ssp_mask |= BIT(epnt->virtual_bus_id);
}
epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length);
}
return ssp_mask;
}
EXPORT_SYMBOL(intel_nhlt_ssp_endpoint_mask);
#define SSP_BLOB_V1_0_SIZE 84
#define SSP_BLOB_V1_0_MDIVC_OFFSET 19 /* offset in u32 */
#define SSP_BLOB_V1_5_SIZE 96
#define SSP_BLOB_V1_5_MDIVC_OFFSET 21 /* offset in u32 */
#define SSP_BLOB_VER_1_5 0xEE000105
#define SSP_BLOB_V2_0_SIZE 88
#define SSP_BLOB_V2_0_MDIVC_OFFSET 20 /* offset in u32 */
#define SSP_BLOB_VER_2_0 0xEE000200
int intel_nhlt_ssp_mclk_mask(struct nhlt_acpi_table *nhlt, int ssp_num)
{
struct nhlt_endpoint *epnt;
struct nhlt_fmt *fmt;
struct nhlt_fmt_cfg *cfg;
int mclk_mask = 0;
int i, j;
if (!nhlt)
return 0;
epnt = (struct nhlt_endpoint *)nhlt->desc;
for (i = 0; i < nhlt->endpoint_count; i++) {
/* we only care about endpoints connected to an audio codec over SSP */
if (epnt->linktype == NHLT_LINK_SSP &&
epnt->device_type == NHLT_DEVICE_I2S &&
epnt->virtual_bus_id == ssp_num) {
fmt = (struct nhlt_fmt *)(epnt->config.caps + epnt->config.size);
cfg = fmt->fmt_config;
/*
* In theory all formats should use the same MCLK but it doesn't hurt to
* double-check that the configuration is consistent
*/
for (j = 0; j < fmt->fmt_count; j++) {
u32 *blob;
int mdivc_offset;
int size;
/* first check we have enough data to read the blob type */
if (cfg->config.size < 8)
return -EINVAL;
blob = (u32 *)cfg->config.caps;
if (blob[1] == SSP_BLOB_VER_2_0) {
mdivc_offset = SSP_BLOB_V2_0_MDIVC_OFFSET;
size = SSP_BLOB_V2_0_SIZE;
} else if (blob[1] == SSP_BLOB_VER_1_5) {
mdivc_offset = SSP_BLOB_V1_5_MDIVC_OFFSET;
size = SSP_BLOB_V1_5_SIZE;
} else {
mdivc_offset = SSP_BLOB_V1_0_MDIVC_OFFSET;
size = SSP_BLOB_V1_0_SIZE;
}
/* make sure we have enough data for the fixed part of the blob */
if (cfg->config.size < size)
return -EINVAL;
mclk_mask |= blob[mdivc_offset] & GENMASK(1, 0);
cfg = (struct nhlt_fmt_cfg *)(cfg->config.caps + cfg->config.size);
}
}
epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length);
}
/* make sure only one MCLK is used */
if (hweight_long(mclk_mask) != 1)
return -EINVAL;
return mclk_mask;
}
EXPORT_SYMBOL(intel_nhlt_ssp_mclk_mask);
static struct nhlt_specific_cfg *
nhlt_get_specific_cfg(struct device *dev, struct nhlt_fmt *fmt, u8 num_ch,
u32 rate, u8 vbps, u8 bps)
{
struct nhlt_fmt_cfg *cfg = fmt->fmt_config;
struct wav_fmt *wfmt;
u16 _bps, _vbps;
int i;
dev_dbg(dev, "Endpoint format count=%d\n", fmt->fmt_count);
for (i = 0; i < fmt->fmt_count; i++) {
wfmt = &cfg->fmt_ext.fmt;
_bps = wfmt->bits_per_sample;
_vbps = cfg->fmt_ext.sample.valid_bits_per_sample;
dev_dbg(dev, "Endpoint format: ch=%d fmt=%d/%d rate=%d\n",
wfmt->channels, _vbps, _bps, wfmt->samples_per_sec);
if (wfmt->channels == num_ch && wfmt->samples_per_sec == rate &&
vbps == _vbps && bps == _bps)
return &cfg->config;
cfg = (struct nhlt_fmt_cfg *)(cfg->config.caps + cfg->config.size);
}
return NULL;
}
static bool nhlt_check_ep_match(struct device *dev, struct nhlt_endpoint *epnt,
u32 bus_id, u8 link_type, u8 dir, u8 dev_type)
{
dev_dbg(dev, "Endpoint: vbus_id=%d link_type=%d dir=%d dev_type = %d\n",
epnt->virtual_bus_id, epnt->linktype,
epnt->direction, epnt->device_type);
if ((epnt->virtual_bus_id != bus_id) ||
(epnt->linktype != link_type) ||
(epnt->direction != dir))
return false;
/* link of type DMIC bypasses device_type check */
return epnt->linktype == NHLT_LINK_DMIC ||
epnt->device_type == dev_type;
}
struct nhlt_specific_cfg *
intel_nhlt_get_endpoint_blob(struct device *dev, struct nhlt_acpi_table *nhlt,
u32 bus_id, u8 link_type, u8 vbps, u8 bps,
u8 num_ch, u32 rate, u8 dir, u8 dev_type)
{
struct nhlt_specific_cfg *cfg;
struct nhlt_endpoint *epnt;
struct nhlt_fmt *fmt;
int i;
if (!nhlt)
return NULL;
dev_dbg(dev, "Looking for configuration:\n");
dev_dbg(dev, " vbus_id=%d link_type=%d dir=%d, dev_type=%d\n",
bus_id, link_type, dir, dev_type);
dev_dbg(dev, " ch=%d fmt=%d/%d rate=%d\n", num_ch, vbps, bps, rate);
dev_dbg(dev, "Endpoint count=%d\n", nhlt->endpoint_count);
epnt = (struct nhlt_endpoint *)nhlt->desc;
for (i = 0; i < nhlt->endpoint_count; i++) {
if (nhlt_check_ep_match(dev, epnt, bus_id, link_type, dir, dev_type)) {
fmt = (struct nhlt_fmt *)(epnt->config.caps + epnt->config.size);
cfg = nhlt_get_specific_cfg(dev, fmt, num_ch, rate, vbps, bps);
if (cfg)
return cfg;
}
epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length);
}
return NULL;
}
EXPORT_SYMBOL(intel_nhlt_get_endpoint_blob);
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