[PATCH 6/11] ASoC: amd: acp-config: route HP Dragonfly Pro ONE through the ACP6x SDW stack

[Corey Smith <corsmith@gmail.com>]

The HP Dragonfly Pro ONE (DMI board 8A7F) is an AMD Rembrandt (ACP6x)
platform whose speakers are two Realtek RT1316 SoundWire amplifiers.
The default driver for ACP6x is snd_pci_acp6x, which only implements the
PDM/DMIC path, so the speakers never appear.

Add a FLAG_AMD_LEGACY_SDW config flag and a DMI entry selecting it for
this board.  The flag makes snd_pci_acp6x bail out (it refuses any
non-zero flag) so that snd-pci-ps can claim the device instead.

Assisted-by: LLM
Signed-off-by: Corey Smith <corsmith@gmail.com>
---
 sound/soc/amd/acp-config.c  | 19 +++++++++++++++++++
 sound/soc/amd/mach-config.h |  6 ++++++
 2 files changed, 25 insertions(+)

diff --git a/sound/soc/amd/acp-config.c b/sound/soc/amd/acp-config.c
index 3d48bb0..c189078 100644
--- a/sound/soc/amd/acp-config.c
+++ b/sound/soc/amd/acp-config.c
@@ -251,6 +251,25 @@ static const struct config_entry config_table[] = {
 			{}
 		},
 	},
+	{
+		/*
+		 * HP Dragonfly Pro ONE (AMD Rembrandt / ACP6x, board 8A7F).
+		 * Speakers are two RT1316 SDCA amplifiers on the ACP SoundWire
+		 * link 0. Use the legacy ACP SoundWire stack rather than the
+		 * DMIC-only snd_pci_acp6x driver.
+		 */
+		.flags = FLAG_AMD_LEGACY_SDW,
+		.device = ACP_PCI_DEV_ID,
+		.dmi_table = (const struct dmi_system_id []) {
+			{
+				.matches = {
+					DMI_MATCH(DMI_BOARD_VENDOR, "HP"),
+					DMI_MATCH(DMI_BOARD_NAME, "8A7F"),
+				},
+			},
+			{}
+		},
+	},
 };
 
 static int snd_amd_acp_acpi_find_config(struct pci_dev *pci)
diff --git a/sound/soc/amd/mach-config.h b/sound/soc/amd/mach-config.h
index 150bab8..99b5b2c 100644
--- a/sound/soc/amd/mach-config.h
+++ b/sound/soc/amd/mach-config.h
@@ -16,6 +16,12 @@
 #define FLAG_AMD_SOF_ONLY_DMIC		BIT(2)
 #define FLAG_AMD_LEGACY			BIT(3)
 #define FLAG_AMD_LEGACY_ONLY_DMIC	BIT(4)
+/*
+ * Route the platform through the legacy ACP SoundWire stack
+ * (snd-pci-ps + snd-ps-sdw-dma + amd_sdw machine driver) instead of
+ * the DMIC-only snd_pci_acp6x driver.
+ */
+#define FLAG_AMD_LEGACY_SDW		BIT(5)
 
 #define ACP_PCI_DEV_ID			0x15E2