[PATCH 1/2 v2] mfd: wm5102: Update register patch

[PATCH 1/2 v2] mfd: wm5102: Update register patch

[Charles Keepax]

Update the register patch based on latest evaluation of the device.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
---

Changed since v1:
  - Updated commit message on patch 2

Thanks,
Charles

 drivers/mfd/wm5102-tables.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/wm5102-tables.c b/drivers/mfd/wm5102-tables.c
index 1e9a4b2..f9b1e96 100644
--- a/drivers/mfd/wm5102-tables.c
+++ b/drivers/mfd/wm5102-tables.c
@@ -73,6 +73,7 @@ static const struct reg_default wm5102_revb_patch[] = {
 	{ 0x171, 0x0000 },
 	{ 0x35E, 0x000C },
 	{ 0x2D4, 0x0000 },
+	{ 0x4DC, 0x0900 },
 	{ 0x80, 0x0000 },
 };
 
-- 
1.7.2.5

[PATCH 2/2 v2] ASoC: arizona: Improve ultrasonic frequency response

[Charles Keepax]

Evaluation of the device has given some settings to improve the
ultrasonic frequency response. However, this may cause sub-optimal
performance in system designs with high output gains on the headphone
path (0dB or -2dB), and as the frequencies are inaudible anyway some
users may not desire higher frequency response at those frequencies.
So allow the user the option to select it if it is appopriate for
their system design.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
---
 include/linux/mfd/arizona/pdata.h |    3 +++
 sound/soc/codecs/arizona.c        |   15 +++++++++++++++
 2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/include/linux/mfd/arizona/pdata.h b/include/linux/mfd/arizona/pdata.h
index 12a5c13..3df0ed5 100644
--- a/include/linux/mfd/arizona/pdata.h
+++ b/include/linux/mfd/arizona/pdata.h
@@ -177,6 +177,9 @@ struct arizona_pdata {
 	/** Mode for outputs */
 	bool out_mono[ARIZONA_MAX_OUTPUT];
 
+	/** Provide improved ultrasonic frequency response */
+	bool ultrasonic_response;
+
 	/** PDM speaker mute setting */
 	unsigned int spk_mute[ARIZONA_MAX_PDM_SPK];
 
diff --git a/sound/soc/codecs/arizona.c b/sound/soc/codecs/arizona.c
index e4295fe..f2e1ffe 100644
--- a/sound/soc/codecs/arizona.c
+++ b/sound/soc/codecs/arizona.c
@@ -1134,6 +1134,21 @@ static int arizona_hw_params_rate(struct snd_pcm_substream *substream,
 	}
 	sr_val = i;
 
+	switch (priv->arizona->type) {
+	case WM5102:
+		if (priv->arizona->pdata.ultrasonic_response) {
+			snd_soc_write(codec, 0x80, 0x3);
+			if (params_rate(params) >= 176400)
+				snd_soc_write(codec, 0x4dd, 0x1);
+			else
+				snd_soc_write(codec, 0x4dd, 0x0);
+			snd_soc_write(codec, 0x80, 0x0);
+		}
+		break;
+	default:
+		break;
+	}
+
 	switch (dai_priv->clk) {
 	case ARIZONA_CLK_SYSCLK:
 		snd_soc_update_bits(codec, ARIZONA_SAMPLE_RATE_1,
-- 
1.7.2.5

Re: [PATCH 1/2 v2] mfd: wm5102: Update register patch

[Lee Jones]

On Fri, 31 Jan 2014, Charles Keepax wrote:

> Update the register patch based on latest evaluation of the device.
> 
> Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
> ---
>  drivers/mfd/wm5102-tables.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)

Applied, thanks.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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Re: [PATCH 2/2 v2] ASoC: arizona: Improve ultrasonic frequency response

[Mark Brown]

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On Fri, Jan 31, 2014 at 04:16:18PM +0000, Charles Keepax wrote:
> Evaluation of the device has given some settings to improve the
> ultrasonic frequency response. However, this may cause sub-optimal
> performance in system designs with high output gains on the headphone
> path (0dB or -2dB), and as the frequencies are inaudible anyway some
> users may not desire higher frequency response at those frequencies.
> So allow the user the option to select it if it is appopriate for
> their system design.

Reading what you're saying here I can't help but think that this sounds
like it may be use case dependent as well and therefore something that
ought to be runtime controllable depending on if ultrasonics and/or line
level outputs are in use (0dB isn't high gain, it's no gain!) for
example.

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Re: [PATCH 2/2 v2] ASoC: arizona: Improve ultrasonic frequency response

[Charles Keepax]

On Tue, Feb 04, 2014 at 12:17:27AM +0000, Mark Brown wrote:
> On Fri, Jan 31, 2014 at 04:16:18PM +0000, Charles Keepax wrote:
> > Evaluation of the device has given some settings to improve the
> > ultrasonic frequency response. However, this may cause sub-optimal
> > performance in system designs with high output gains on the headphone
> > path (0dB or -2dB), and as the frequencies are inaudible anyway some
> > users may not desire higher frequency response at those frequencies.
> > So allow the user the option to select it if it is appopriate for
> > their system design.
> 
> Reading what you're saying here I can't help but think that this sounds
> like it may be use case dependent as well and therefore something that
> ought to be runtime controllable depending on if ultrasonics and/or line
> level outputs are in use (0dB isn't high gain, it's no gain!) for
> example.

I think in practice it will likely be set once for a given
system. Although that said there is nothing that would prevent
this being switchable at runtime, I will look into respinning it
with runtime control.

Thanks,
Charles