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ALSA: hda: Allow to fetch hlink by ID

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Starting with LNL platform, Intel HDAudio Links carry IDs specifying
non-HDAudio transfer type they help facilitate e.g.: 0xC0 for I2S as
defined by AZX_REG_ML_LEPTR_ID_INTEL_SSP.

The mechanism accounts for LEPTR register as it is Reserved if
LCAP.ALT for given Link equals 0.

Reviewed-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Link: https://patch.msgid.link/20250407112352.3720779-2-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Cezary Rojewski 2025-04-07 13:23:43 +02:00 committed by Mark Brown
parent 0af2f6be1b
commit 318c9eef63
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 23 additions and 0 deletions
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5
include/sound/hdaudio_ext.h
View File

@ -22,6 +22,7 @@ void snd_hdac_ext_bus_ppcap_enable(struct hdac_bus *chip, bool enable);
void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_bus *chip, bool enable);
int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_bus *bus);
struct hdac_ext_link *snd_hdac_ext_bus_get_hlink_by_id(struct hdac_bus *bus, u32 id);
struct hdac_ext_link *snd_hdac_ext_bus_get_hlink_by_addr(struct hdac_bus *bus, int addr);
struct hdac_ext_link *snd_hdac_ext_bus_get_hlink_by_name(struct hdac_bus *bus,
const char *codec_name);
@ -97,12 +98,16 @@ struct hdac_ext_link {
void __iomem *ml_addr; /* link output stream reg pointer */
u32 lcaps; /* link capablities */
u16 lsdiid; /* link sdi identifier */
u32 id;
int ref_count;
struct list_head list;
};
#define hdac_ext_link_alt(link) ((link)->lcaps & AZX_ML_HDA_LCAP_ALT)
#define hdac_ext_link_ofls(link) ((link)->lcaps & AZX_ML_HDA_LCAP_OFLS)
int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *hlink);
int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *hlink);
int snd_hdac_ext_bus_link_power_up_all(struct hdac_bus *bus);

18
sound/hda/ext/hdac_ext_controller.c
View File

@ -9,6 +9,7 @@
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <sound/hda_register.h>
@ -81,6 +82,7 @@ int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_bus *bus)
int idx;
u32 link_count;
struct hdac_ext_link *hlink;
u32 leptr;
link_count = readl(bus->mlcap + AZX_REG_ML_MLCD) + 1;
@ -97,6 +99,11 @@ int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_bus *bus)
hlink->lcaps = readl(hlink->ml_addr + AZX_REG_ML_LCAP);
hlink->lsdiid = readw(hlink->ml_addr + AZX_REG_ML_LSDIID);
if (hdac_ext_link_alt(hlink)) {
leptr = readl(hlink->ml_addr + AZX_REG_ML_LEPTR);
hlink->id = FIELD_GET(AZX_REG_ML_LEPTR_ID, leptr);
}
/* since link in On, update the ref */
hlink->ref_count = 1;
@ -125,6 +132,17 @@ void snd_hdac_ext_link_free_all(struct hdac_bus *bus)
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_link_free_all);
struct hdac_ext_link *snd_hdac_ext_bus_get_hlink_by_id(struct hdac_bus *bus, u32 id)
{
struct hdac_ext_link *hlink;
list_for_each_entry(hlink, &bus->hlink_list, list)
if (hdac_ext_link_alt(hlink) && hlink->id == id)
return hlink;
return NULL;
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_hlink_by_id);
/**
* snd_hdac_ext_bus_get_hlink_by_addr - get hlink at specified address
* @bus: hlink's parent bus device