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ALSA/hda: intel-sdw-acpi: add support for sdw-manager-list property read

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The DisCo for SoundWire 2.0 spec adds support for a new
sdw-manager-list property.  Add it in backwards-compatible mode with
'sdw-master-count', which assumed that all links between 0..count-1
exist.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20241001070611.63288-5-yung-chuan.liao@linux.intel.com
This commit is contained in:
Pierre-Louis Bossart 2024-10-01 15:06:11 +08:00 committed by Takashi Iwai
parent 8782ba9685
commit 71dce222d5
2 changed files with 18 additions and 9 deletions
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2
include/linux/soundwire/sdw_intel.h
View File

@ -227,7 +227,7 @@ struct sdw_intel_ops {
/**
* struct sdw_intel_acpi_info - Soundwire Intel information found in ACPI tables
* @handle: ACPI controller handle
* @count: link count found with "sdw-master-count" property
* @count: link count found with "sdw-master-count" or "sdw-manager-list" property
* @link_mask: bit-wise mask listing links enabled by BIOS menu
*
* this structure could be expanded to e.g. provide all the _ADR

21
sound/hda/intel-sdw-acpi.c
View File

@ -57,8 +57,10 @@ sdw_intel_scan_controller(struct sdw_intel_acpi_info *info)
{
struct acpi_device *adev = acpi_fetch_acpi_dev(info->handle);
struct fwnode_handle *fwnode;
unsigned long list;
unsigned int i;
u32 count;
u32 tmp;
int ret;
if (!adev)
@ -66,10 +68,9 @@ sdw_intel_scan_controller(struct sdw_intel_acpi_info *info)
fwnode = acpi_fwnode_handle(adev);
/* Found controller, find links supported */
ret = fwnode_property_read_u32(fwnode, "mipi-sdw-master-count", &count);
/*
* Found controller, find links supported
*
* In theory we could check the number of links supported in
* hardware, but in that step we cannot assume SoundWire IP is
* powered.
@ -80,12 +81,20 @@ sdw_intel_scan_controller(struct sdw_intel_acpi_info *info)
*
* We will check the hardware capabilities in the startup() step
*/
ret = fwnode_property_read_u32(fwnode, "mipi-sdw-manager-list", &tmp);
if (ret) {
ret = fwnode_property_read_u32(fwnode, "mipi-sdw-master-count", &count);
if (ret) {
dev_err(&adev->dev,
"Failed to read mipi-sdw-master-count: %d\n", ret);
"Failed to read mipi-sdw-master-count: %d\n",
ret);
return ret;
}
list = GENMASK(count - 1, 0);
} else {
list = tmp;
count = hweight32(list);
}
/* Check count is within bounds */
if (count > SDW_INTEL_MAX_LINKS) {
@ -103,7 +112,7 @@ sdw_intel_scan_controller(struct sdw_intel_acpi_info *info)
info->count = count;
info->link_mask = 0;
for (i = 0; i < count; i++) {
for_each_set_bit(i, &list, SDW_INTEL_MAX_LINKS) {
if (ctrl_link_mask && !(ctrl_link_mask & BIT(i))) {
dev_dbg(&adev->dev,
"Link %d masked, will not be enabled\n", i);