[PATCH 1/2] ASoC: SOF: Intel: hda: Introduce skip_imr_boot flag

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

Use a dedicated flag instead of directly checking the
sdev->system_suspend_target to decide if we need to skip IMR boot due to
too deep sleep state where the memory used for IMR booting will not retain
its content.

The skip_imr_boot flag will be set true during suspend if the target state
is deeper than S3 and reset back to false on successful boot to re-enable
IMR booting in shallower sleep states.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
---
 sound/soc/sof/intel/hda-dsp.c    |  7 +++++++
 sound/soc/sof/intel/hda-loader.c | 10 ++++++----
 sound/soc/sof/intel/hda.h        |  1 +
 3 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/sound/soc/sof/intel/hda-dsp.c b/sound/soc/sof/intel/hda-dsp.c
index 2afaee91b982..eddfd77ad90f 100644
--- a/sound/soc/sof/intel/hda-dsp.c
+++ b/sound/soc/sof/intel/hda-dsp.c
@@ -617,6 +617,13 @@ static int hda_suspend(struct snd_sof_dev *sdev, bool runtime_suspend)
 #endif
 	int ret, j;
 
+	/*
+	 * The memory used for IMR boot loses its content in deeper than S3 state
+	 * We must not try IMR boot on next power up (as it will fail).
+	 */
+	if (sdev->system_suspend_target > SOF_SUSPEND_S3)
+		hda->skip_imr_boot = true;
+
 	hda_sdw_int_enable(sdev, false);
 
 	/* disable IPC interrupts */
diff --git a/sound/soc/sof/intel/hda-loader.c b/sound/soc/sof/intel/hda-loader.c
index 819b3b08c655..eb22eb3f6fee 100644
--- a/sound/soc/sof/intel/hda-loader.c
+++ b/sound/soc/sof/intel/hda-loader.c
@@ -395,8 +395,7 @@ int hda_dsp_cl_boot_firmware(struct snd_sof_dev *sdev)
 	struct snd_dma_buffer dmab;
 	int ret, ret1, i;
 
-	if (sdev->system_suspend_target < SOF_SUSPEND_S4 &&
-	    hda->imrboot_supported && !sdev->first_boot) {
+	if (hda->imrboot_supported && !sdev->first_boot && !hda->skip_imr_boot) {
 		dev_dbg(sdev->dev, "IMR restore supported, booting from IMR directly\n");
 		hda->boot_iteration = 0;
 		ret = hda_dsp_boot_imr(sdev);
@@ -480,11 +479,14 @@ int hda_dsp_cl_boot_firmware(struct snd_sof_dev *sdev)
 	 */
 	hda->boot_iteration = HDA_FW_BOOT_ATTEMPTS;
 	ret = hda_cl_copy_fw(sdev, hext_stream);
-	if (!ret)
+	if (!ret) {
 		dev_dbg(sdev->dev, "Firmware download successful, booting...\n");
-	else
+		hda->skip_imr_boot = false;
+	} else {
 		snd_sof_dsp_dbg_dump(sdev, "Firmware download failed",
 				     SOF_DBG_DUMP_PCI | SOF_DBG_DUMP_MBOX);
+		hda->skip_imr_boot = true;
+	}
 
 cleanup:
 	/*
diff --git a/sound/soc/sof/intel/hda.h b/sound/soc/sof/intel/hda.h
index dc713c20ba1d..2b4d23af6054 100644
--- a/sound/soc/sof/intel/hda.h
+++ b/sound/soc/sof/intel/hda.h
@@ -419,6 +419,7 @@ enum sof_hda_D0_substate {
 /* represents DSP HDA controller frontend - i.e. host facing control */
 struct sof_intel_hda_dev {
 	bool imrboot_supported;
+	bool skip_imr_boot;
 
 	int boot_iteration;
 
-- 
2.37.0