[PATCH AUTOSEL 6.6 10/20] ASoC: SOF: amd: Handle IPC replies before FW_BOOT_COMPLETE

[Sasha Levin <sashal@kernel.org>]

From: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>

[ Upstream commit ac84ca815adb4171a4276b1d44096b75f6a150b7 ]

In some cases, e.g. during resuming from suspend, there is a possibility
that some IPC reply messages get received by the host while the DSP
firmware has not yet reached the complete boot state.

Detect when this happens and do not attempt to process the unexpected
replies from DSP.  Instead, provide proper debugging support.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Link: https://patch.msgid.link/20250207-sof-vangogh-fixes-v1-3-67824c1e4c9a@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 sound/soc/sof/amd/acp-ipc.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/sound/soc/sof/amd/acp-ipc.c b/sound/soc/sof/amd/acp-ipc.c
index fcb54f545fea3..a4e9bc20adaff 100644
--- a/sound/soc/sof/amd/acp-ipc.c
+++ b/sound/soc/sof/amd/acp-ipc.c
@@ -167,6 +167,7 @@ irqreturn_t acp_sof_ipc_irq_thread(int irq, void *context)
 
 	if (sdev->first_boot && sdev->fw_state != SOF_FW_BOOT_COMPLETE) {
 		acp_mailbox_read(sdev, sdev->dsp_box.offset, &status, sizeof(status));
+
 		if ((status & SOF_IPC_PANIC_MAGIC_MASK) == SOF_IPC_PANIC_MAGIC) {
 			snd_sof_dsp_panic(sdev, sdev->dsp_box.offset + sizeof(status),
 					  true);
@@ -188,13 +189,21 @@ irqreturn_t acp_sof_ipc_irq_thread(int irq, void *context)
 
 	dsp_ack = snd_sof_dsp_read(sdev, ACP_DSP_BAR, ACP_SCRATCH_REG_0 + dsp_ack_write);
 	if (dsp_ack) {
-		spin_lock_irq(&sdev->ipc_lock);
-		/* handle immediate reply from DSP core */
-		acp_dsp_ipc_get_reply(sdev);
-		snd_sof_ipc_reply(sdev, 0);
-		/* set the done bit */
-		acp_dsp_ipc_dsp_done(sdev);
-		spin_unlock_irq(&sdev->ipc_lock);
+		if (likely(sdev->fw_state == SOF_FW_BOOT_COMPLETE)) {
+			spin_lock_irq(&sdev->ipc_lock);
+
+			/* handle immediate reply from DSP core */
+			acp_dsp_ipc_get_reply(sdev);
+			snd_sof_ipc_reply(sdev, 0);
+			/* set the done bit */
+			acp_dsp_ipc_dsp_done(sdev);
+
+			spin_unlock_irq(&sdev->ipc_lock);
+		} else {
+			dev_dbg_ratelimited(sdev->dev, "IPC reply before FW_BOOT_COMPLETE: %#x\n",
+					    dsp_ack);
+		}
+
 		ipc_irq = true;
 	}
 
-- 
2.39.5