ASoC: Intel: Skylake: Enable firmware reload in suspend

Broxton DSP needs retains code loaded during runtime_pm cycles.
But it looses that on suspend cycle, so on resume we need to
download the firmware again.

This is done by adding a new flag and based on flag status, we
download the firmware.

Signed-off-by: Jayachandran B <jayachandran.b@intel.com>
Signed-off-by: Senthilnathan Veppur <senthilnathanx.veppur@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/skylake/bxt-sst.c

@@ -185,6 +185,7 @@ static int bxt_load_base_firmware(struct sst_dsp *ctx)
 		} else {
 			skl_dsp_set_state_locked(ctx, SKL_DSP_RUNNING);
 			ret = 0;
+			skl->fw_loaded = true;
 		}
 	}
 
@@ -200,6 +201,14 @@ static int bxt_set_dsp_D0(struct sst_dsp *ctx)
 
 	skl->boot_complete = false;
 
+	if (skl->fw_loaded == false) {
+		dev_dbg(ctx->dev, "Re-loading fw\n");
+		ret = bxt_load_base_firmware(ctx);
+		if (ret < 0)
+			dev_err(ctx->dev, "reload fw failed: %d\n", ret);
+		return ret;
+	}
+
 	ret = skl_dsp_enable_core(ctx);
 	if (ret < 0) {
 		dev_err(ctx->dev, "enable dsp core failed ret: %d\n", ret);

sound/soc/intel/skylake/skl-sst-ipc.h

@@ -63,6 +63,9 @@ struct skl_sst {
 
 	/* Populate module information */
 	struct list_head uuid_list;
+
+	/* Is firmware loaded */
+	bool fw_loaded;
 };
 
 struct skl_ipc_init_instance_msg {

sound/soc/intel/skylake/skl-sst.c

@@ -153,6 +153,7 @@ static int skl_load_base_firmware(struct sst_dsp *ctx)
 
 		dev_dbg(ctx->dev, "Download firmware successful%d\n", ret);
 		skl_dsp_set_state_locked(ctx, SKL_DSP_RUNNING);
+		skl->fw_loaded = true;
 	}
 	return 0;
 transfer_firmware_failed:

sound/soc/intel/skylake/skl.c

@@ -248,6 +248,7 @@ static int skl_suspend(struct device *dev)
 		ret = _skl_suspend(ebus);
 		if (ret < 0)
 			return ret;
+		skl->skl_sst->fw_loaded = false;
 	}
 
 	if (IS_ENABLED(CONFIG_SND_SOC_HDAC_HDMI)) {