[PATCH 4/8] ASoC: SOF: Intel: add kernel parameter to set DMI L1 configuration

[Pierre-Louis Bossart]

Exposing the DMI L1 configuration to users was in hindsight a bad
idea. It led to several errors reported by distributions which
selected it by mistake.

The Kconfig is now replaced with a kernel parameter that should only
be used by expert users for tests. In a follow-up patch, the DMI L1
configuration is enabled automatically to conform to hardware
programming sequences.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen at linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan at linux.intel.com>
---
 sound/soc/sof/intel/Kconfig   | 10 ----------
 sound/soc/sof/intel/hda-pcm.c |  7 ++++++-
 2 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/sound/soc/sof/intel/Kconfig b/sound/soc/sof/intel/Kconfig
index d9108b12740e..219cf0bf9633 100644
--- a/sound/soc/sof/intel/Kconfig
+++ b/sound/soc/sof/intel/Kconfig
@@ -249,16 +249,6 @@ config SND_SOC_SOF_HDA_PROBES
 	  Say Y if you want to enable probes.
 	  If unsure, select "N".
 
-config SND_SOC_SOF_HDA_ALWAYS_ENABLE_DMI_L1
-	bool "SOF Intel-HDA enable DMI Link L1"
-	help
-	  This option enables DMI L1 for both playback and capture
-	  and disables known workarounds for specific HDAudio platforms.
-	  Only use to look into power optimizations on platforms not
-	  affected by DMI L1 issues. This option is not recommended.
-	  Say Y if you want to enable DMI Link L1.
-	  If unsure, select "N".
-
 endif ## SND_SOC_SOF_HDA_COMMON
 
 config SND_SOC_SOF_HDA_LINK_BASELINE
diff --git a/sound/soc/sof/intel/hda-pcm.c b/sound/soc/sof/intel/hda-pcm.c
index 59220fa1def1..47ff2c757d0a 100644
--- a/sound/soc/sof/intel/hda-pcm.c
+++ b/sound/soc/sof/intel/hda-pcm.c
@@ -15,6 +15,7 @@
  * Hardware interface for generic Intel audio DSP HDA IP
  */
 
+#include <linux/moduleparam.h>
 #include <sound/hda_register.h>
 #include <sound/pcm_params.h>
 #include "../sof-audio.h"
@@ -27,6 +28,10 @@
 #define SDnFMT_BITS(x)	((x) << 4)
 #define SDnFMT_CHAN(x)	((x) << 0)
 
+static bool hda_always_enable_dmi_l1;
+module_param_named(always_enable_dmi_l1, hda_always_enable_dmi_l1, bool, 0444);
+MODULE_PARM_DESC(always_enable_dmi_l1, "SOF HDA always enable DMI l1");
+
 u32 hda_dsp_get_mult_div(struct snd_sof_dev *sdev, int rate)
 {
 	switch (rate) {
@@ -229,7 +234,7 @@ int hda_dsp_pcm_open(struct snd_sof_dev *sdev,
 	}
 
 	/* All playback and D0i3 compatible streams are DMI L1 capable */
-	if (IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_ALWAYS_ENABLE_DMI_L1) ||
+	if (hda_always_enable_dmi_l1 ||
 	    direction == SNDRV_PCM_STREAM_PLAYBACK ||
 	    spcm->stream[substream->stream].d0i3_compatible)
 		flags |= SOF_HDA_STREAM_DMI_L1_COMPATIBLE;
-- 
2.25.1