Commit f1aa0684 authored by Mengdong Lin's avatar Mengdong Lin Committed by Takashi Iwai
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ALSA: hda - add flags and routines to get devices selection info for DP1.2 MST 



This patch adds flags and routines to get device list & selection info on
a pin.

To support Display Port 1.2 multi-stream transport (MST) over single DP port,
a pin can support multiple devices. Please refer to HD-A spec Document Change
Notificaton HDA040-A.

A display audio codec can set flag "dp_mst" in its patch, indicating its pins
can support MST. But at runtime, a pin may not be multi-streaming capable and
report the device list is empty, depending on Gfx driver configuration.

Signed-off-by: default avatarMengdong Lin <mengdong.lin@intel.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 68538bf2

sound/pci/hda/hda_codec.c

+58 −0
Original line number Diff line number Diff line
@@ -666,6 +666,64 @@ int snd_hda_get_conn_index(struct hda_codec *codec, hda_nid_t mux, 
}

EXPORT_SYMBOL_HDA(snd_hda_get_conn_index);





/* return DEVLIST_LEN parameter of the given widget */

static unsigned int get_num_devices(struct hda_codec *codec, hda_nid_t nid)

{

	unsigned int wcaps = get_wcaps(codec, nid);

	unsigned int parm;



	if (!codec->dp_mst || !(wcaps & AC_WCAP_DIGITAL) ||

	    get_wcaps_type(wcaps) != AC_WID_PIN)

		return 0;



	parm = snd_hda_param_read(codec, nid, AC_PAR_DEVLIST_LEN);

	if (parm == -1 && codec->bus->rirb_error)

		parm = 0;

	return parm & AC_DEV_LIST_LEN_MASK;

}



/**

 * snd_hda_get_devices - copy device list without cache

 * @codec: the HDA codec

 * @nid: NID of the pin to parse

 * @dev_list: device list array

 * @max_devices: max. number of devices to store

 *

 * Copy the device list. This info is dynamic and so not cached.

 * Currently called only from hda_proc.c, so not exported.

 */

int snd_hda_get_devices(struct hda_codec *codec, hda_nid_t nid,

			u8 *dev_list, int max_devices)

{

	unsigned int parm;

	int i, dev_len, devices;



	parm = get_num_devices(codec, nid);

	if (!parm)	/* not multi-stream capable */

		return 0;



	dev_len = parm + 1;

	dev_len = dev_len < max_devices ? dev_len : max_devices;



	devices = 0;

	while (devices < dev_len) {

		parm = snd_hda_codec_read(codec, nid, 0,

					  AC_VERB_GET_DEVICE_LIST, devices);

		if (parm == -1 && codec->bus->rirb_error)

			break;



		for (i = 0; i < 8; i++) {

			dev_list[devices] = (u8)parm;

			parm >>= 4;

			devices++;

			if (devices >= dev_len)

				break;

		}

	}

	return devices;

}



/**

 * snd_hda_queue_unsol_event - add an unsolicited event to queue

 * @bus: the BUS

sound/pci/hda/hda_codec.h

+16 −0
Original line number Diff line number Diff line
@@ -94,6 +94,8 @@ enum { 
#define AC_VERB_GET_HDMI_DIP_XMIT		0x0f32

#define AC_VERB_GET_HDMI_CP_CTRL		0x0f33

#define AC_VERB_GET_HDMI_CHAN_SLOT		0x0f34

#define AC_VERB_GET_DEVICE_SEL			0xf35

#define AC_VERB_GET_DEVICE_LIST			0xf36



/*

 * SET verbs
@@ -133,6 +135,7 @@ enum { 
#define AC_VERB_SET_HDMI_DIP_XMIT		0x732

#define AC_VERB_SET_HDMI_CP_CTRL		0x733

#define AC_VERB_SET_HDMI_CHAN_SLOT		0x734

#define AC_VERB_SET_DEVICE_SEL			0x735



/*

 * Parameter IDs
@@ -154,6 +157,7 @@ enum { 
#define AC_PAR_GPIO_CAP			0x11

#define AC_PAR_AMP_OUT_CAP		0x12

#define AC_PAR_VOL_KNB_CAP		0x13

#define AC_PAR_DEVLIST_LEN		0x15

#define AC_PAR_HDMI_LPCM_CAP		0x20



/*
@@ -352,6 +356,10 @@ enum { 
#define AC_LPCMCAP_44K			(1<<30)	/* 44.1kHz support */

#define AC_LPCMCAP_44K_MS		(1<<31)	/* 44.1kHz-multiplies support */



/* Display pin's device list length */

#define AC_DEV_LIST_LEN_MASK		0x3f

#define AC_MAX_DEV_LIST_LEN		64



/*

 * Control Parameters

 */
@@ -460,6 +468,11 @@ enum { 
#define AC_DEFCFG_PORT_CONN		(0x3<<30)

#define AC_DEFCFG_PORT_CONN_SHIFT	30



/* Display pin's device list entry */

#define AC_DE_PD			(1<<0)

#define AC_DE_ELDV			(1<<1)

#define AC_DE_IA			(1<<2)



/* device device types (0x0-0xf) */

enum {

	AC_JACK_LINE_OUT,
@@ -885,6 +898,7 @@ struct hda_codec { 
	unsigned int pcm_format_first:1; /* PCM format must be set first */

	unsigned int epss:1;		/* supporting EPSS? */

	unsigned int cached_write:1;	/* write only to caches */

	unsigned int dp_mst:1; /* support DP1.2 Multi-stream transport */

#ifdef CONFIG_PM

	unsigned int power_on :1;	/* current (global) power-state */

	unsigned int d3_stop_clk:1;	/* support D3 operation without BCLK */
@@ -972,6 +986,8 @@ int snd_hda_override_conn_list(struct hda_codec *codec, hda_nid_t nid, int nums, 
			  const hda_nid_t *list);

int snd_hda_get_conn_index(struct hda_codec *codec, hda_nid_t mux,

			   hda_nid_t nid, int recursive);

int snd_hda_get_devices(struct hda_codec *codec, hda_nid_t nid,

			u8 *dev_list, int max_devices);

int snd_hda_query_supported_pcm(struct hda_codec *codec, hda_nid_t nid,

				u32 *ratesp, u64 *formatsp, unsigned int *bpsp);

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