[PATCH 2/4] ASoC: SOF: Intel: ipc4: Read the interrupt reason registers at the same time

[Peter Ujfalusi <peter.ujfalusi@linux.intel.com>]

Read both registers as the first step in the interrupt handler to make
sure that we are handling the event which triggered the interrupt.

The delayed reading of the target request register might reflect incorrect
information about the reason why the interrupt was risen.

Note also that the IPC3 interrupt handler is implemented in this way also.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
---
 sound/soc/sof/intel/cnl.c     | 2 +-
 sound/soc/sof/intel/hda-ipc.c | 3 ++-
 sound/soc/sof/intel/mtl.c     | 2 +-
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/sound/soc/sof/intel/cnl.c b/sound/soc/sof/intel/cnl.c
index 19d0b1909bfd..2f2bcde42759 100644
--- a/sound/soc/sof/intel/cnl.c
+++ b/sound/soc/sof/intel/cnl.c
@@ -41,6 +41,7 @@ irqreturn_t cnl_ipc4_irq_thread(int irq, void *context)
 	u32 hipcida, hipctdr;
 
 	hipcida = snd_sof_dsp_read(sdev, HDA_DSP_BAR, CNL_DSP_REG_HIPCIDA);
+	hipctdr = snd_sof_dsp_read(sdev, HDA_DSP_BAR, CNL_DSP_REG_HIPCTDR);
 	if (hipcida & CNL_DSP_REG_HIPCIDA_DONE) {
 		/* DSP received the message */
 		snd_sof_dsp_update_bits(sdev, HDA_DSP_BAR,
@@ -51,7 +52,6 @@ irqreturn_t cnl_ipc4_irq_thread(int irq, void *context)
 		ipc_irq = true;
 	}
 
-	hipctdr = snd_sof_dsp_read(sdev, HDA_DSP_BAR, CNL_DSP_REG_HIPCTDR);
 	if (hipctdr & CNL_DSP_REG_HIPCTDR_BUSY) {
 		/* Message from DSP (reply or notification) */
 		u32 hipctdd = snd_sof_dsp_read(sdev, HDA_DSP_BAR,
diff --git a/sound/soc/sof/intel/hda-ipc.c b/sound/soc/sof/intel/hda-ipc.c
index 9b3667c705e4..4118532faf3f 100644
--- a/sound/soc/sof/intel/hda-ipc.c
+++ b/sound/soc/sof/intel/hda-ipc.c
@@ -126,6 +126,8 @@ irqreturn_t hda_dsp_ipc4_irq_thread(int irq, void *context)
 	u32 hipcie, hipct;
 
 	hipcie = snd_sof_dsp_read(sdev, HDA_DSP_BAR, HDA_DSP_REG_HIPCIE);
+	hipct = snd_sof_dsp_read(sdev, HDA_DSP_BAR, HDA_DSP_REG_HIPCT);
+
 	if (hipcie & HDA_DSP_REG_HIPCIE_DONE) {
 		/* DSP received the message */
 		snd_sof_dsp_update_bits(sdev, HDA_DSP_BAR, HDA_DSP_REG_HIPCCTL,
@@ -135,7 +137,6 @@ irqreturn_t hda_dsp_ipc4_irq_thread(int irq, void *context)
 		ipc_irq = true;
 	}
 
-	hipct = snd_sof_dsp_read(sdev, HDA_DSP_BAR, HDA_DSP_REG_HIPCT);
 	if (hipct & HDA_DSP_REG_HIPCT_BUSY) {
 		/* Message from DSP (reply or notification) */
 		u32 hipcte = snd_sof_dsp_read(sdev, HDA_DSP_BAR,
diff --git a/sound/soc/sof/intel/mtl.c b/sound/soc/sof/intel/mtl.c
index 10298532816f..a9b31b31a4e4 100644
--- a/sound/soc/sof/intel/mtl.c
+++ b/sound/soc/sof/intel/mtl.c
@@ -497,6 +497,7 @@ static irqreturn_t mtl_ipc_irq_thread(int irq, void *context)
 	u32 hipctdr;
 
 	hipcida = snd_sof_dsp_read(sdev, HDA_DSP_BAR, MTL_DSP_REG_HFIPCXIDA);
+	hipctdr = snd_sof_dsp_read(sdev, HDA_DSP_BAR, MTL_DSP_REG_HFIPCXTDR);
 
 	/* reply message from DSP */
 	if (hipcida & MTL_DSP_REG_HFIPCXIDA_DONE) {
@@ -509,7 +510,6 @@ static irqreturn_t mtl_ipc_irq_thread(int irq, void *context)
 		ipc_irq = true;
 	}
 
-	hipctdr = snd_sof_dsp_read(sdev, HDA_DSP_BAR, MTL_DSP_REG_HFIPCXTDR);
 	if (hipctdr & MTL_DSP_REG_HFIPCXTDR_BUSY) {
 		/* Message from DSP (reply or notification) */
 		u32 extension = snd_sof_dsp_read(sdev, HDA_DSP_BAR, MTL_DSP_REG_HFIPCXTDDY);
-- 
2.38.0