ASoC: wm_adsp: Add mechanism to preload firmware on a core

As requirements to bring up audio paths are continuous getting tighter
and the DSP download to most ADSP devices happens over an external bus
it can become an important factor in the path bring up time. As such
sometimes it is a reasonable trade off to download the firmware ahead of
when it will be required and take a small hit on power consumption for
keeping the core powered up.

This "preloading" adds an additional control for each DSP core "DSPx
Preload Switch" that when set to true will power up the DSP core and
download the firmware currently selected in the "DSPx Firmware" control.
Whilst the core is preloaded the current firmware can not be changed and
the CODEC will be kept powered up and SYSCLK held on. Although future
improvements may allow the SYSCLK to be powered down as well because
the hardware only requires SYSCLK whilst the download is actually taking
place, but this is not covered in this series.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

6 files changed, 66 insertions, 1 deletions

diff --git a/sound/soc/codecs/arizona.h b/sound/soc/codecs/arizona.h
index 56707860657c..1822e3b3de80 100644
--- a/sound/soc/codecs/arizona.h
+++ b/sound/soc/codecs/arizona.h
@@ -192,6 +192,7 @@ extern unsigned int arizona_mixer_values[ARIZONA_NUM_MIXER_INPUTS];
 #define ARIZONA_DSP_ROUTES(name) \
 	{ name, NULL, name " Preloader"}, \
 	{ name " Preloader", NULL, "SYSCLK" }, \
+	{ name " Preload", NULL, name " Preloader"}, \
 	{ name, NULL, name " Aux 1" }, \
 	{ name, NULL, name " Aux 2" }, \
 	{ name, NULL, name " Aux 3" }, \
diff --git a/sound/soc/codecs/cs47l24.c b/sound/soc/codecs/cs47l24.c
index 73559ae864b6..0dd721e3005d 100644
--- a/sound/soc/codecs/cs47l24.c
+++ b/sound/soc/codecs/cs47l24.c
@@ -173,6 +173,9 @@ SOC_ENUM("ISRC2 FSH", arizona_isrc_fsh[1]),
 SOC_ENUM("ISRC3 FSH", arizona_isrc_fsh[2]),
 SOC_ENUM("ASRC RATE 1", arizona_asrc_rate1),
 
+WM_ADSP2_PRELOAD_SWITCH("DSP2", 2),
+WM_ADSP2_PRELOAD_SWITCH("DSP3", 3),
+
 ARIZONA_MIXER_CONTROLS("DSP2L", ARIZONA_DSP2LMIX_INPUT_1_SOURCE),
 ARIZONA_MIXER_CONTROLS("DSP2R", ARIZONA_DSP2RMIX_INPUT_1_SOURCE),
 ARIZONA_MIXER_CONTROLS("DSP3L", ARIZONA_DSP3LMIX_INPUT_1_SOURCE),
diff --git a/sound/soc/codecs/wm5102.c b/sound/soc/codecs/wm5102.c
index e7ab37d0dd32..9edd239c3b06 100644
--- a/sound/soc/codecs/wm5102.c
+++ b/sound/soc/codecs/wm5102.c
@@ -855,6 +855,8 @@ ARIZONA_LHPF_CONTROL("LHPF2 Coefficients", ARIZONA_HPLPF2_2),
 ARIZONA_LHPF_CONTROL("LHPF3 Coefficients", ARIZONA_HPLPF3_2),
 ARIZONA_LHPF_CONTROL("LHPF4 Coefficients", ARIZONA_HPLPF4_2),
 
+WM_ADSP2_PRELOAD_SWITCH("DSP1", 1),
+
 ARIZONA_MIXER_CONTROLS("DSP1L", ARIZONA_DSP1LMIX_INPUT_1_SOURCE),
 ARIZONA_MIXER_CONTROLS("DSP1R", ARIZONA_DSP1RMIX_INPUT_1_SOURCE),
 
diff --git a/sound/soc/codecs/wm5110.c b/sound/soc/codecs/wm5110.c
index 585fc706c1b0..01b5b6c66417 100644
--- a/sound/soc/codecs/wm5110.c
+++ b/sound/soc/codecs/wm5110.c
@@ -778,6 +778,11 @@ SOC_ENUM("ISRC2 FSH", arizona_isrc_fsh[1]),
 SOC_ENUM("ISRC3 FSH", arizona_isrc_fsh[2]),
 SOC_ENUM("ASRC RATE 1", arizona_asrc_rate1),
 
+WM_ADSP2_PRELOAD_SWITCH("DSP1", 1),
+WM_ADSP2_PRELOAD_SWITCH("DSP2", 2),
+WM_ADSP2_PRELOAD_SWITCH("DSP3", 3),
+WM_ADSP2_PRELOAD_SWITCH("DSP4", 4),
+
 ARIZONA_MIXER_CONTROLS("DSP1L", ARIZONA_DSP1LMIX_INPUT_1_SOURCE),
 ARIZONA_MIXER_CONTROLS("DSP1R", ARIZONA_DSP1RMIX_INPUT_1_SOURCE),
 ARIZONA_MIXER_CONTROLS("DSP2L", ARIZONA_DSP2LMIX_INPUT_1_SOURCE),
diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index 593b7d1aed46..ed615ce8a496 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -2500,6 +2500,43 @@ static void wm_adsp2_set_dspclk(struct wm_adsp *dsp, unsigned int freq)
 		adsp_err(dsp, "Failed to set clock rate: %d\n", ret);
 }
 
+int wm_adsp2_preloader_get(struct snd_kcontrol *kcontrol,
+			   struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
+	struct wm_adsp *dsp = snd_soc_codec_get_drvdata(codec);
+
+	ucontrol->value.integer.value[0] = dsp->preloaded;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(wm_adsp2_preloader_get);
+
+int wm_adsp2_preloader_put(struct snd_kcontrol *kcontrol,
+			   struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
+	struct wm_adsp *dsp = snd_soc_codec_get_drvdata(codec);
+	struct snd_soc_dapm_context *dapm = snd_soc_codec_get_dapm(codec);
+	struct soc_mixer_control *mc =
+		(struct soc_mixer_control *)kcontrol->private_value;
+	char preload[32];
+
+	snprintf(preload, ARRAY_SIZE(preload), "DSP%d Preload", mc->shift);
+
+	dsp->preloaded = ucontrol->value.integer.value[0];
+
+	if (ucontrol->value.integer.value[0])
+		snd_soc_dapm_force_enable_pin(dapm, preload);
+	else
+		snd_soc_dapm_disable_pin(dapm, preload);
+
+	snd_soc_dapm_sync(dapm);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(wm_adsp2_preloader_put);
+
 int wm_adsp2_early_event(struct snd_soc_dapm_widget *w,
 			 struct snd_kcontrol *kcontrol, int event,
 			 unsigned int freq)
@@ -2631,10 +2668,16 @@ EXPORT_SYMBOL_GPL(wm_adsp2_event);
 
 int wm_adsp2_codec_probe(struct wm_adsp *dsp, struct snd_soc_codec *codec)
 {
-	dsp->codec = codec;
+	struct snd_soc_dapm_context *dapm = snd_soc_codec_get_dapm(codec);
+	char preload[32];
+
+	snprintf(preload, ARRAY_SIZE(preload), "DSP%d Preload", dsp->num);
+	snd_soc_dapm_disable_pin(dapm, preload);
 
 	wm_adsp2_init_debugfs(dsp, codec);
 
+	dsp->codec = codec;
+
 	return snd_soc_add_codec_controls(codec,
 					  &wm_adsp_fw_controls[dsp->num - 1],
 					  1);
diff --git a/sound/soc/codecs/wm_adsp.h b/sound/soc/codecs/wm_adsp.h
index 411d062c13f2..3706b11053a3 100644
--- a/sound/soc/codecs/wm_adsp.h
+++ b/sound/soc/codecs/wm_adsp.h
@@ -62,6 +62,7 @@ struct wm_adsp {
 	int fw;
 	int fw_ver;
 
+	bool preloaded;
 	bool booted;
 	bool running;
 
@@ -86,7 +87,12 @@ struct wm_adsp {
 	SND_SOC_DAPM_PGA_E(wname, SND_SOC_NOPM, num, 0, NULL, 0, \
 		wm_adsp1_event, SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD)
 
+#define WM_ADSP2_PRELOAD_SWITCH(wname, num) \
+	SOC_SINGLE_EXT(wname " Preload Switch", SND_SOC_NOPM, num, 1, 0, \
+		wm_adsp2_preloader_get, wm_adsp2_preloader_put)
+
 #define WM_ADSP2(wname, num, event_fn) \
+	SND_SOC_DAPM_SPK(wname " Preload", NULL), \
 {	.id = snd_soc_dapm_supply, .name = wname " Preloader", \
 	.reg = SND_SOC_NOPM, .shift = num, .event = event_fn, \
 	.event_flags = SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_PRE_PMD, \
@@ -110,6 +116,11 @@ int wm_adsp2_early_event(struct snd_soc_dapm_widget *w,
 int wm_adsp2_event(struct snd_soc_dapm_widget *w,
 		   struct snd_kcontrol *kcontrol, int event);
 
+int wm_adsp2_preloader_get(struct snd_kcontrol *kcontrol,
+			   struct snd_ctl_elem_value *ucontrol);
+int wm_adsp2_preloader_put(struct snd_kcontrol *kcontrol,
+			   struct snd_ctl_elem_value *ucontrol);
+
 int wm_adsp_compr_open(struct wm_adsp *dsp, struct snd_compr_stream *stream);
 int wm_adsp_compr_free(struct snd_compr_stream *stream);
 int wm_adsp_compr_set_params(struct snd_compr_stream *stream,