ASoC: SOF: Intel: hda-stream: limit PROCEN workaround

The work-around enabled in hda-stream.c is only required on earlier
versions of SOCs/PCH (Skylake, KabyLake, ApolloLake,
GeminiLake). Before setting the format on the host DMA, it is required
to couple the host and link DMA - which as a consequence shall use the
same format.

This patch introduces a quirk field in the platform descriptor and
makes the work-around conditional. Newer platforms have
no limitations on the use of host and link DMA, which can use
different formats.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Link: https://lore.kernel.org/r/20211207193947.71080-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/intel/apl.c

@@ -147,5 +147,6 @@ const struct sof_intel_dsp_desc apl_chip_info = {
 	.rom_init_timeout	= 150,
 	.ssp_count = APL_SSP_COUNT,
 	.ssp_base_offset = APL_SSP_BASE_OFFSET,
+	.quirks = SOF_INTEL_PROCEN_FMT_QUIRK,
 };
 EXPORT_SYMBOL_NS(apl_chip_info, SND_SOC_SOF_INTEL_HDA_COMMON);

sound/soc/sof/intel/hda-stream.c

@@ -472,6 +472,7 @@ int hda_dsp_stream_hw_params(struct snd_sof_dev *sdev,
 			     struct snd_dma_buffer *dmab,
 			     struct snd_pcm_hw_params *params)
 {
+	const struct sof_intel_dsp_desc *chip = get_chip_info(sdev->pdata);
 	struct hdac_bus *bus = sof_to_bus(sdev);
 	struct hdac_stream *hstream = &stream->hstream;
 	int sd_offset = SOF_STREAM_SD_OFFSET(hstream);
@@ -584,6 +585,7 @@ int hda_dsp_stream_hw_params(struct snd_sof_dev *sdev,
 
 	/*
 	 * Recommended hardware programming sequence for HDAudio DMA format
+	 * on earlier platforms - this is not needed on newer platforms
 	 *
 	 * 1. Put DMA into coupled mode by clearing PPCTL.PROCEN bit
 	 *    for corresponding stream index before the time of writing
@@ -593,19 +595,23 @@ int hda_dsp_stream_hw_params(struct snd_sof_dev *sdev,
 	 *    enable decoupled mode
 	 */
 
-	/* couple host and link DMA, disable DSP features */
-	snd_sof_dsp_update_bits(sdev, HDA_DSP_PP_BAR, SOF_HDA_REG_PP_PPCTL,
-				mask, 0);
+	if (chip->quirks & SOF_INTEL_PROCEN_FMT_QUIRK) {
+		/* couple host and link DMA, disable DSP features */
+		snd_sof_dsp_update_bits(sdev, HDA_DSP_PP_BAR, SOF_HDA_REG_PP_PPCTL,
+					mask, 0);
+	}
 
 	/* program stream format */
 	snd_sof_dsp_update_bits(sdev, HDA_DSP_HDA_BAR,
 				sd_offset +
 				SOF_HDA_ADSP_REG_CL_SD_FORMAT,
 				0xffff, hstream->format_val);
 
-	/* decouple host and link DMA, enable DSP features */
-	snd_sof_dsp_update_bits(sdev, HDA_DSP_PP_BAR, SOF_HDA_REG_PP_PPCTL,
-				mask, mask);
+	if (chip->quirks & SOF_INTEL_PROCEN_FMT_QUIRK) {
+		/* decouple host and link DMA, enable DSP features */
+		snd_sof_dsp_update_bits(sdev, HDA_DSP_PP_BAR, SOF_HDA_REG_PP_PPCTL,
+					mask, mask);
+	}
 
 	/* program last valid index */
 	snd_sof_dsp_update_bits(sdev, HDA_DSP_HDA_BAR,

sound/soc/sof/intel/shim.h

@@ -151,6 +151,9 @@
 #define PCI_PMCS		0x84
 #define PCI_PMCS_PS_MASK	0x3
 
+/* Intel quirks */
+#define SOF_INTEL_PROCEN_FMT_QUIRK BIT(0)
+
 /* DSP hardware descriptor */
 struct sof_intel_dsp_desc {
 	int cores_num;
@@ -166,6 +169,7 @@ struct sof_intel_dsp_desc {
 	int ssp_base_offset;		/* base address of the SSPs */
 	u32 sdw_shim_base;
 	u32 sdw_alh_base;
+	u32 quirks;
 	bool (*check_sdw_irq)(struct snd_sof_dev *sdev);
 };