ASoC: SOF: Intel: mtl: fix page fault in dspless mode when DSP is disabled

The patch to make DSPless mode work even if the DSP is
disabled in BIOS missed to touch the MTL code to add
the needed checks.
If the DSP is disabled this can lead to page fault due to not
accesible registers.

Fixes: 9fc6786f ("ASoC: SOF: Intel: hda: make DSPless mode work with DSP disabled in BIOS")
Signed-off-by: Fred Oh <fred.oh@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20230412061457.27937-1-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/intel/mtl.c

@@ -60,6 +60,9 @@ static bool mtl_dsp_check_ipc_irq(struct snd_sof_dev *sdev)
 	u32 irq_status;
 	u32 hfintipptr;
 
+	if (sdev->dspless_mode_selected)
+		return false;
+
 	/* read Interrupt IP Pointer */
 	hfintipptr = snd_sof_dsp_read(sdev, HDA_DSP_BAR, MTL_HFINTIPPTR) & MTL_HFINTIPPTR_PTR_MASK;
 	irq_status = snd_sof_dsp_read(sdev, HDA_DSP_BAR, hfintipptr + MTL_DSP_IRQSTS);
@@ -120,6 +123,9 @@ static void mtl_enable_ipc_interrupts(struct snd_sof_dev *sdev)
 	struct sof_intel_hda_dev *hda = sdev->pdata->hw_pdata;
 	const struct sof_intel_dsp_desc *chip = hda->desc;
 
+	if (sdev->dspless_mode_selected)
+		return;
+
 	/* enable IPC DONE and BUSY interrupts */
 	snd_sof_dsp_update_bits(sdev, HDA_DSP_BAR, chip->ipc_ctl,
 				MTL_DSP_REG_HFIPCXCTL_BUSY | MTL_DSP_REG_HFIPCXCTL_DONE,
@@ -131,6 +137,9 @@ static void mtl_disable_ipc_interrupts(struct snd_sof_dev *sdev)
 	struct sof_intel_hda_dev *hda = sdev->pdata->hw_pdata;
 	const struct sof_intel_dsp_desc *chip = hda->desc;
 
+	if (sdev->dspless_mode_selected)
+		return;
+
 	/* disable IPC DONE and BUSY interrupts */
 	snd_sof_dsp_update_bits(sdev, HDA_DSP_BAR, chip->ipc_ctl,
 				MTL_DSP_REG_HFIPCXCTL_BUSY | MTL_DSP_REG_HFIPCXCTL_DONE, 0);
@@ -143,6 +152,9 @@ static void mtl_enable_sdw_irq(struct snd_sof_dev *sdev, bool enable)
 	u32 val;
 	int ret;
 
+	if (sdev->dspless_mode_selected)
+		return;
+
 	/* Enable/Disable SoundWire interrupt */
 	mask = MTL_DSP_REG_HfSNDWIE_IE_MASK;
 	if (enable)
@@ -170,6 +182,9 @@ static int mtl_enable_interrupts(struct snd_sof_dev *sdev, bool enable)
 	u32 val;
 	int ret;
 
+	if (sdev->dspless_mode_selected)
+		return 0;
+
 	/* read Interrupt IP Pointer */
 	hfintipptr = snd_sof_dsp_read(sdev, HDA_DSP_BAR, MTL_HFINTIPPTR) & MTL_HFINTIPPTR_PTR_MASK;