soc/intel/mtl: Set HDA subsystem ID during FSP-M

Intel introduced a new UPD specifically for setting the HDA subsystem ID
in FSP-M. Using SiSsidTablePtr in FSP-S no longer works as it will be
locked with a default value of 0 by that point.

Tested on Clevo V560TU with MTL FSP 4122.12 (0D.00.A8.20).

TEST=PCI config space for HDA device has subsystem ID set.

Change-Id: I5e668747d99b955b0a3946524c5918d328b8e1d3
Signed-off-by: Tim Crawford <tcrawford@system76.com>

src/soc/intel/meteorlake/romstage/fsp_params.c

@@ -282,6 +282,8 @@ static void fill_fspm_misc_params(FSP_M_CONFIG *m_cfg,
 static void fill_fspm_audio_params(FSP_M_CONFIG *m_cfg,
 		const struct soc_intel_meteorlake_config *config)
 {
+	const struct device *dev;
+
 	/* Audio: HDAUDIO_LINK_MODE I2S/SNDW */
 	m_cfg->PchHdaEnable = is_devfn_enabled(PCI_DEVFN_HDA);
 	m_cfg->PchHdaDspEnable = config->pch_hda_dsp_enable;
@@ -302,6 +304,13 @@ static void fill_fspm_audio_params(FSP_M_CONFIG *m_cfg,
 	memset(m_cfg->PchHdaAudioLinkDmicEnable, 0, sizeof(m_cfg->PchHdaAudioLinkDmicEnable));
 	memset(m_cfg->PchHdaAudioLinkSspEnable, 0, sizeof(m_cfg->PchHdaAudioLinkSspEnable));
 	memset(m_cfg->PchHdaAudioLinkSndwEnable, 0, sizeof(m_cfg->PchHdaAudioLinkSndwEnable));
+
+	dev = pcidev_path_on_root(PCI_DEVFN_HDA);
+	if (dev) {
+		uint16_t svid = CONFIG_SUBSYSTEM_VENDOR_ID ? : (dev->subsystem_vendor ? : 0x8086);
+		uint16_t ssid = CONFIG_SUBSYSTEM_DEVICE_ID ? : (dev->subsystem_device ? : 0x7e28);
+		m_cfg->PchHdaSubSystemIds = (ssid << 16) | svid;
+	}
 }
 
 static void fill_fspm_cnvi_params(FSP_M_CONFIG *m_cfg,