[PATCH v6 1/4] drm/i915: Add audio sync_audio_rate callback

[PATCH v6 1/4] drm/i915: Add audio sync_audio_rate callback

[libin.yang]

From: Libin Yang <libin.yang@intel.com>

Add the sync_audio_rate callback.

With the callback, audio driver can trigger
i915 driver to set the proper N/CTS or N/M
based on different sample rates.

Signed-off-by: Libin Yang <libin.yang@intel.com>
---
 include/drm/i915_component.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/drm/i915_component.h b/include/drm/i915_component.h
index c9a8b64..8ad6f1b 100644
--- a/include/drm/i915_component.h
+++ b/include/drm/i915_component.h
@@ -33,6 +33,13 @@ struct i915_audio_component {
 		void (*put_power)(struct device *);
 		void (*codec_wake_override)(struct device *, bool enable);
 		int (*get_cdclk_freq)(struct device *);
+		/**
+		 * @sync_audio_rate: set n/cts based on the sample rate
+		 *
+		 * Called from audio driver. After audio driver sets the
+		 * sample rate, it will call this function to set n/cts
+		 */
+		int (*sync_audio_rate)(struct device *, int port, int rate);
 	} *ops;
 };
 
-- 
1.9.1

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[PATCH v6 2/4] drm/i915: implement sync_audio_rate callback

[libin.yang]

From: Libin Yang <libin.yang@intel.com>

HDMI audio may not work at some frequencies
with the HW provided N/CTS.

This patch sets the proper N value for the
given audio sample rate at the impacted frequencies.
At other frequencies, it will use the N/CTS value
which HW provides.

Signed-off-by: Libin Yang <libin.yang@intel.com>
---
 drivers/gpu/drm/i915/i915_dma.c    |   1 +
 drivers/gpu/drm/i915/i915_drv.h    |   5 ++
 drivers/gpu/drm/i915/intel_audio.c | 138 +++++++++++++++++++++++++++++++++++++
 3 files changed, 144 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 097d4ba..8ffb5dc 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -858,6 +858,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 	mutex_init(&dev_priv->sb_lock);
 	mutex_init(&dev_priv->modeset_restore_lock);
 	mutex_init(&dev_priv->csr_lock);
+	mutex_init(&dev_priv->av_mutex);
 
 	intel_pm_setup(dev);
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 05ffd5a..2c6b76f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1882,6 +1882,11 @@ struct drm_i915_private {
 
 	/* hda/i915 audio component */
 	bool audio_component_registered;
+	/**
+	 * av_mutex - mutex for audio/video sync
+	 *
+	 */
+	struct mutex av_mutex;
 
 	uint32_t hw_context_size;
 	struct list_head context_list;
diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
index dc32cf4..a021720 100644
--- a/drivers/gpu/drm/i915/intel_audio.c
+++ b/drivers/gpu/drm/i915/intel_audio.c
@@ -68,6 +68,31 @@ static const struct {
 	{ 148500, AUD_CONFIG_PIXEL_CLOCK_HDMI_148500 },
 };
 
+/* HDMI N/CTS table */
+#define TMDS_297M 297000
+#define TMDS_296M DIV_ROUND_UP(297000 * 1000, 1001)
+static const struct {
+	int sample_rate;
+	int clock;
+	int n;
+	int cts;
+} aud_ncts[] = {
+	{ 44100, TMDS_296M, 4459, 234375 },
+	{ 44100, TMDS_297M, 4704, 247500 },
+	{ 48000, TMDS_296M, 5824, 281250 },
+	{ 48000, TMDS_297M, 5120, 247500 },
+	{ 32000, TMDS_296M, 5824, 421875 },
+	{ 32000, TMDS_297M, 3072, 222750 },
+	{ 88200, TMDS_296M, 8918, 234375 },
+	{ 88200, TMDS_297M, 9408, 247500 },
+	{ 96000, TMDS_296M, 11648, 281250 },
+	{ 96000, TMDS_297M, 10240, 247500 },
+	{ 176400, TMDS_296M, 17836, 234375 },
+	{ 176400, TMDS_297M, 18816, 247500 },
+	{ 192000, TMDS_296M, 23296, 281250 },
+	{ 192000, TMDS_297M, 20480, 247500 },
+};
+
 /* get AUD_CONFIG_PIXEL_CLOCK_HDMI_* value for mode */
 static u32 audio_config_hdmi_pixel_clock(struct drm_display_mode *mode)
 {
@@ -90,6 +115,31 @@ static u32 audio_config_hdmi_pixel_clock(struct drm_display_mode *mode)
 	return hdmi_audio_clock[i].config;
 }
 
+static int audio_config_get_n(const struct drm_display_mode *mode, int rate)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(aud_ncts); i++) {
+		if ((rate == aud_ncts[i].sample_rate) &&
+			(mode->clock == aud_ncts[i].clock)) {
+			return aud_ncts[i].n;
+		}
+	}
+	return 0;
+}
+
+/* check whether N/CTS/M need be set manually */
+static bool audio_rate_need_prog(struct intel_crtc *crtc,
+					struct drm_display_mode *mode)
+{
+	if (((mode->clock == TMDS_297M) ||
+		 (mode->clock == TMDS_296M)) &&
+		intel_pipe_has_type(crtc, INTEL_OUTPUT_HDMI))
+		return true;
+	else
+		return false;
+}
+
 static bool intel_eld_uptodate(struct drm_connector *connector,
 			       int reg_eldv, uint32_t bits_eldv,
 			       int reg_elda, uint32_t bits_elda,
@@ -184,6 +234,8 @@ static void hsw_audio_codec_disable(struct intel_encoder *encoder)
 
 	DRM_DEBUG_KMS("Disable audio codec on pipe %c\n", pipe_name(pipe));
 
+	mutex_lock(&dev_priv->av_mutex);
+
 	/* Disable timestamps */
 	tmp = I915_READ(HSW_AUD_CFG(pipe));
 	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
@@ -199,6 +251,8 @@ static void hsw_audio_codec_disable(struct intel_encoder *encoder)
 	tmp &= ~AUDIO_ELD_VALID(pipe);
 	tmp &= ~AUDIO_OUTPUT_ENABLE(pipe);
 	I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);
+
+	mutex_unlock(&dev_priv->av_mutex);
 }
 
 static void hsw_audio_codec_enable(struct drm_connector *connector,
@@ -215,6 +269,8 @@ static void hsw_audio_codec_enable(struct drm_connector *connector,
 	DRM_DEBUG_KMS("Enable audio codec on pipe %c, %u bytes ELD\n",
 		      pipe_name(pipe), drm_eld_size(eld));
 
+	mutex_lock(&dev_priv->av_mutex);
+
 	/* Enable audio presence detect, invalidate ELD */
 	tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
 	tmp |= AUDIO_OUTPUT_ENABLE(pipe);
@@ -253,6 +309,8 @@ static void hsw_audio_codec_enable(struct drm_connector *connector,
 	else
 		tmp |= audio_config_hdmi_pixel_clock(mode);
 	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
+
+	mutex_unlock(&dev_priv->av_mutex);
 }
 
 static void ilk_audio_codec_disable(struct intel_encoder *encoder)
@@ -514,12 +572,92 @@ static int i915_audio_component_get_cdclk_freq(struct device *dev)
 	return ret;
 }
 
+static int i915_audio_component_sync_audio_rate(struct device *dev,
+						int port, int rate)
+{
+	struct drm_i915_private *dev_priv = dev_to_i915(dev);
+	struct drm_device *drm_dev = dev_priv->dev;
+	struct intel_encoder *intel_encoder;
+	struct intel_digital_port *intel_dig_port;
+	struct intel_crtc *crtc;
+	struct drm_display_mode *mode;
+	enum pipe pipe = -1;
+	u32 tmp;
+	int n_low, n_up, n;
+
+	/* HSW, BDW SKL need this fix */
+	if (!IS_SKYLAKE(dev_priv) &&
+		!IS_BROADWELL(dev_priv) &&
+		!IS_HASWELL(dev_priv))
+		return 0;
+
+	mutex_lock(&dev_priv->av_mutex);
+	/* 1. get the pipe */
+	for_each_intel_encoder(drm_dev, intel_encoder) {
+		if (intel_encoder->type != INTEL_OUTPUT_HDMI)
+			continue;
+		intel_dig_port = enc_to_dig_port(&intel_encoder->base);
+		if (port == intel_dig_port->port) {
+			crtc = to_intel_crtc(intel_encoder->base.crtc);
+			if (!crtc) {
+				DRM_DEBUG_KMS("%s: crtc is NULL\n", __func__);
+				continue;
+			}
+			pipe = crtc->pipe;
+			break;
+		}
+	}
+
+	if (pipe == INVALID_PIPE) {
+		DRM_DEBUG_KMS("no pipe for the port %c\n", port_name(port));
+		mutex_unlock(&dev_priv->av_mutex);
+		return -ENODEV;
+	}
+	DRM_DEBUG_KMS("pipe %c connects port %c\n",
+				  pipe_name(pipe), port_name(port));
+	mode = &crtc->config->base.adjusted_mode;
+
+	/* 2. check whether to set the N/CTS/M manually or not */
+	if (!audio_rate_need_prog(crtc, mode)) {
+		tmp = I915_READ(HSW_AUD_CFG(pipe));
+		tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
+		I915_WRITE(HSW_AUD_CFG(pipe), tmp);
+		mutex_unlock(&dev_priv->av_mutex);
+		return 0;
+	}
+
+	n = audio_config_get_n(mode, rate);
+	if (n == 0) {
+		DRM_DEBUG_KMS("Using automatic mode for N value on port %c\n",
+					  port_name(port));
+		tmp = I915_READ(HSW_AUD_CFG(pipe));
+		tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
+		I915_WRITE(HSW_AUD_CFG(pipe), tmp);
+		mutex_unlock(&dev_priv->av_mutex);
+		return 0;
+	}
+	n_low = n & 0xfff;
+	n_up = (n >> 12) & 0xff;
+
+	/* 4. set the N/CTS/M */
+	tmp = I915_READ(HSW_AUD_CFG(pipe));
+	tmp &= ~(AUD_CONFIG_UPPER_N_MASK | AUD_CONFIG_LOWER_N_MASK);
+	tmp |= ((n_up << AUD_CONFIG_UPPER_N_SHIFT) |
+			(n_low << AUD_CONFIG_LOWER_N_SHIFT) |
+			AUD_CONFIG_N_PROG_ENABLE);
+	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
+
+	mutex_unlock(&dev_priv->av_mutex);
+	return 0;
+}
+
 static const struct i915_audio_component_ops i915_audio_component_ops = {
 	.owner		= THIS_MODULE,
 	.get_power	= i915_audio_component_get_power,
 	.put_power	= i915_audio_component_put_power,
 	.codec_wake_override = i915_audio_component_codec_wake_override,
 	.get_cdclk_freq	= i915_audio_component_get_cdclk_freq,
+	.sync_audio_rate = i915_audio_component_sync_audio_rate,
 };
 
 static int i915_audio_component_bind(struct device *i915_dev,
-- 
1.9.1

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Re: [PATCH v6 2/4] drm/i915: implement sync_audio_rate callback

[Jani Nikula]

On Wed, 02 Sep 2015, libin.yang@intel.com wrote:
> From: Libin Yang <libin.yang@intel.com>
>
> HDMI audio may not work at some frequencies
> with the HW provided N/CTS.
>
> This patch sets the proper N value for the
> given audio sample rate at the impacted frequencies.
> At other frequencies, it will use the N/CTS value
> which HW provides.
>
> Signed-off-by: Libin Yang <libin.yang@intel.com>

Okay, so there are a number of questions and comments this patch still
raises. Please find them inline.

*However*, we should really get this finally moving forward, and I don't
think the issues are or need to be blockers, so this is

Reviewed-by: Jani Nikula <jani.nikula@intel.com>

I think we (as in i915 folks) can clean the rest of the bikeshedding up,
and I don't think we should be NAKing this ad infinitum to teach you to
become an i915 developer... unless you want to be one. ;)

> ---
>  drivers/gpu/drm/i915/i915_dma.c    |   1 +
>  drivers/gpu/drm/i915/i915_drv.h    |   5 ++
>  drivers/gpu/drm/i915/intel_audio.c | 138 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 144 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index 097d4ba..8ffb5dc 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -858,6 +858,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
>  	mutex_init(&dev_priv->sb_lock);
>  	mutex_init(&dev_priv->modeset_restore_lock);
>  	mutex_init(&dev_priv->csr_lock);
> +	mutex_init(&dev_priv->av_mutex);
>  
>  	intel_pm_setup(dev);
>  
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 05ffd5a..2c6b76f 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1882,6 +1882,11 @@ struct drm_i915_private {
>  
>  	/* hda/i915 audio component */
>  	bool audio_component_registered;
> +	/**
> +	 * av_mutex - mutex for audio/video sync
> +	 *
> +	 */
> +	struct mutex av_mutex;
>  
>  	uint32_t hw_context_size;
>  	struct list_head context_list;
> diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
> index dc32cf4..a021720 100644
> --- a/drivers/gpu/drm/i915/intel_audio.c
> +++ b/drivers/gpu/drm/i915/intel_audio.c
> @@ -68,6 +68,31 @@ static const struct {
>  	{ 148500, AUD_CONFIG_PIXEL_CLOCK_HDMI_148500 },
>  };
>  
> +/* HDMI N/CTS table */
> +#define TMDS_297M 297000
> +#define TMDS_296M DIV_ROUND_UP(297000 * 1000, 1001)
> +static const struct {
> +	int sample_rate;
> +	int clock;
> +	int n;
> +	int cts;
> +} aud_ncts[] = {
> +	{ 44100, TMDS_296M, 4459, 234375 },
> +	{ 44100, TMDS_297M, 4704, 247500 },
> +	{ 48000, TMDS_296M, 5824, 281250 },
> +	{ 48000, TMDS_297M, 5120, 247500 },
> +	{ 32000, TMDS_296M, 5824, 421875 },
> +	{ 32000, TMDS_297M, 3072, 222750 },
> +	{ 88200, TMDS_296M, 8918, 234375 },
> +	{ 88200, TMDS_297M, 9408, 247500 },
> +	{ 96000, TMDS_296M, 11648, 281250 },
> +	{ 96000, TMDS_297M, 10240, 247500 },
> +	{ 176400, TMDS_296M, 17836, 234375 },
> +	{ 176400, TMDS_297M, 18816, 247500 },
> +	{ 192000, TMDS_296M, 23296, 281250 },
> +	{ 192000, TMDS_297M, 20480, 247500 },
> +};

Okay, I admit, I did not look these up in the spec. *blush*. I'm sure
Ville has/will. ;)

> +
>  /* get AUD_CONFIG_PIXEL_CLOCK_HDMI_* value for mode */
>  static u32 audio_config_hdmi_pixel_clock(struct drm_display_mode *mode)
>  {
> @@ -90,6 +115,31 @@ static u32 audio_config_hdmi_pixel_clock(struct drm_display_mode *mode)
>  	return hdmi_audio_clock[i].config;
>  }
>  
> +static int audio_config_get_n(const struct drm_display_mode *mode, int rate)
> +{
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(aud_ncts); i++) {
> +		if ((rate == aud_ncts[i].sample_rate) &&
> +			(mode->clock == aud_ncts[i].clock)) {
> +			return aud_ncts[i].n;
> +		}
> +	}
> +	return 0;
> +}
> +
> +/* check whether N/CTS/M need be set manually */
> +static bool audio_rate_need_prog(struct intel_crtc *crtc,
> +					struct drm_display_mode *mode)
> +{
> +	if (((mode->clock == TMDS_297M) ||
> +		 (mode->clock == TMDS_296M)) &&
> +		intel_pipe_has_type(crtc, INTEL_OUTPUT_HDMI))
> +		return true;
> +	else
> +		return false;
> +}
> +
>  static bool intel_eld_uptodate(struct drm_connector *connector,
>  			       int reg_eldv, uint32_t bits_eldv,
>  			       int reg_elda, uint32_t bits_elda,
> @@ -184,6 +234,8 @@ static void hsw_audio_codec_disable(struct intel_encoder *encoder)
>  
>  	DRM_DEBUG_KMS("Disable audio codec on pipe %c\n", pipe_name(pipe));
>  
> +	mutex_lock(&dev_priv->av_mutex);
> +

Bikeshed. We should think about moving the locking to
intel_audio_codec_enable and intel_audio_codec_disable for
consistency. We'll be adding new platform hooks eventually anyway, no
need to duplicate the locking everywhere.

>  	/* Disable timestamps */
>  	tmp = I915_READ(HSW_AUD_CFG(pipe));
>  	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
> @@ -199,6 +251,8 @@ static void hsw_audio_codec_disable(struct intel_encoder *encoder)
>  	tmp &= ~AUDIO_ELD_VALID(pipe);
>  	tmp &= ~AUDIO_OUTPUT_ENABLE(pipe);
>  	I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);
> +
> +	mutex_unlock(&dev_priv->av_mutex);
>  }
>  
>  static void hsw_audio_codec_enable(struct drm_connector *connector,
> @@ -215,6 +269,8 @@ static void hsw_audio_codec_enable(struct drm_connector *connector,
>  	DRM_DEBUG_KMS("Enable audio codec on pipe %c, %u bytes ELD\n",
>  		      pipe_name(pipe), drm_eld_size(eld));
>  
> +	mutex_lock(&dev_priv->av_mutex);
> +
>  	/* Enable audio presence detect, invalidate ELD */
>  	tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
>  	tmp |= AUDIO_OUTPUT_ENABLE(pipe);
> @@ -253,6 +309,8 @@ static void hsw_audio_codec_enable(struct drm_connector *connector,
>  	else
>  		tmp |= audio_config_hdmi_pixel_clock(mode);
>  	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> +
> +	mutex_unlock(&dev_priv->av_mutex);
>  }
>  
>  static void ilk_audio_codec_disable(struct intel_encoder *encoder)
> @@ -514,12 +572,92 @@ static int i915_audio_component_get_cdclk_freq(struct device *dev)
>  	return ret;
>  }
>  
> +static int i915_audio_component_sync_audio_rate(struct device *dev,
> +						int port, int rate)
> +{
> +	struct drm_i915_private *dev_priv = dev_to_i915(dev);
> +	struct drm_device *drm_dev = dev_priv->dev;
> +	struct intel_encoder *intel_encoder;
> +	struct intel_digital_port *intel_dig_port;
> +	struct intel_crtc *crtc;
> +	struct drm_display_mode *mode;
> +	enum pipe pipe = -1;

Nitpick. Initialize to INVALID_PIPE.

> +	u32 tmp;
> +	int n_low, n_up, n;
> +
> +	/* HSW, BDW SKL need this fix */
> +	if (!IS_SKYLAKE(dev_priv) &&
> +		!IS_BROADWELL(dev_priv) &&
> +		!IS_HASWELL(dev_priv))
> +		return 0;

Nitpick. We should elaborate that a bit more. Is it basically that only
the above platforms support HDMI mode and audio sample rate combinations
that the automatic mode in hardware can't support? In other words, would
audio_rate_need_prog() always return false on other platforms than
hsw/bdw/skl? And if so, why do we have this check? Perhaps we should
take care to make audio_rate_need_prog() do the right thing, and do that
as the first thing here.

> +
> +	mutex_lock(&dev_priv->av_mutex);
> +	/* 1. get the pipe */
> +	for_each_intel_encoder(drm_dev, intel_encoder) {
> +		if (intel_encoder->type != INTEL_OUTPUT_HDMI)
> +			continue;
> +		intel_dig_port = enc_to_dig_port(&intel_encoder->base);
> +		if (port == intel_dig_port->port) {
> +			crtc = to_intel_crtc(intel_encoder->base.crtc);
> +			if (!crtc) {
> +				DRM_DEBUG_KMS("%s: crtc is NULL\n", __func__);

DRM_DEBUG_KMS includes __func__ already.

> +				continue;
> +			}
> +			pipe = crtc->pipe;
> +			break;
> +		}
> +	}
> +
> +	if (pipe == INVALID_PIPE) {
> +		DRM_DEBUG_KMS("no pipe for the port %c\n", port_name(port));
> +		mutex_unlock(&dev_priv->av_mutex);
> +		return -ENODEV;

Nitpick. I am not fond of early returns when cleanup like mutex unlock
is required. The function should have goto labels at the end with
cleanup. (OTOH if we move locking to higher level this problem goes
away.)

> +	}
> +	DRM_DEBUG_KMS("pipe %c connects port %c\n",
> +				  pipe_name(pipe), port_name(port));
> +	mode = &crtc->config->base.adjusted_mode;
> +
> +	/* 2. check whether to set the N/CTS/M manually or not */
> +	if (!audio_rate_need_prog(crtc, mode)) {
> +		tmp = I915_READ(HSW_AUD_CFG(pipe));
> +		tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
> +		I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> +		mutex_unlock(&dev_priv->av_mutex);
> +		return 0;

Nitpick. Same here, you could have an auto: label at the end with the
auto programming...

> +	}
> +
> +	n = audio_config_get_n(mode, rate);
> +	if (n == 0) {
> +		DRM_DEBUG_KMS("Using automatic mode for N value on port %c\n",
> +					  port_name(port));
> +		tmp = I915_READ(HSW_AUD_CFG(pipe));
> +		tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
> +		I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> +		mutex_unlock(&dev_priv->av_mutex);
> +		return 0;

...especially because this bit is duplicated for no good reason.

Fallback to auto mode if the mode isn't in the list is, I think, a good
thing. Maybe it would deserve a DRM_ERROR, because clearly that
shouldn't happen.

But it's actually the !audio_rate_need_prog case that makes me wonder. I
think we've confirmed with the silicon folks that we can change N on the
fly... but I'm actually not sure if we've confirmed that we can switch
between automatic and manual modes on the fly. I think I've said it
before, but I think I'd prefer it if we always used the manual mode
anyway to reduce the complexity and have only one code path to debug,
and that would also cover the somewhat of a corner case (but still real
case) of switching between automatic/manual modes on the fly. And of
course, this conflicts with what I said about the platform support check
above, so needs thought.

> +	}
> +	n_low = n & 0xfff;
> +	n_up = (n >> 12) & 0xff;
> +
> +	/* 4. set the N/CTS/M */
> +	tmp = I915_READ(HSW_AUD_CFG(pipe));
> +	tmp &= ~(AUD_CONFIG_UPPER_N_MASK | AUD_CONFIG_LOWER_N_MASK);
> +	tmp |= ((n_up << AUD_CONFIG_UPPER_N_SHIFT) |
> +			(n_low << AUD_CONFIG_LOWER_N_SHIFT) |
> +			AUD_CONFIG_N_PROG_ENABLE);
> +	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> +
> +	mutex_unlock(&dev_priv->av_mutex);
> +	return 0;
> +}
> +
>  static const struct i915_audio_component_ops i915_audio_component_ops = {
>  	.owner		= THIS_MODULE,
>  	.get_power	= i915_audio_component_get_power,
>  	.put_power	= i915_audio_component_put_power,
>  	.codec_wake_override = i915_audio_component_codec_wake_override,
>  	.get_cdclk_freq	= i915_audio_component_get_cdclk_freq,
> +	.sync_audio_rate = i915_audio_component_sync_audio_rate,
>  };
>  
>  static int i915_audio_component_bind(struct device *i915_dev,
> -- 
> 1.9.1
>

-- 
Jani Nikula, Intel Open Source Technology Center
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Re: [PATCH v6 2/4] drm/i915: implement sync_audio_rate callback

[Yang, Libin]

Hi Jani,

> -----Original Message-----
> From: Jani Nikula [mailto:jani.nikula@linux.intel.com]
> Sent: Wednesday, September 02, 2015 3:52 PM
> To: Yang, Libin; alsa-devel@alsa-project.org; tiwai@suse.de; intel-
> gfx@lists.freedesktop.org; daniel.vetter@ffwll.ch;
> ville.syrjala@linux.intel.com
> Cc: Yang, Libin
> Subject: Re: [PATCH v6 2/4] drm/i915: implement sync_audio_rate
> callback
> 
> On Wed, 02 Sep 2015, libin.yang@intel.com wrote:
> > From: Libin Yang <libin.yang@intel.com>
> >
> > HDMI audio may not work at some frequencies
> > with the HW provided N/CTS.
> >
> > This patch sets the proper N value for the
> > given audio sample rate at the impacted frequencies.
> > At other frequencies, it will use the N/CTS value
> > which HW provides.
> >
> > Signed-off-by: Libin Yang <libin.yang@intel.com>
> 
> Okay, so there are a number of questions and comments this patch still
> raises. Please find them inline.
> 
> *However*, we should really get this finally moving forward, and I
> don't
> think the issues are or need to be blockers, so this is
> 
> Reviewed-by: Jani Nikula <jani.nikula@intel.com>
> 
> I think we (as in i915 folks) can clean the rest of the bikeshedding up,
> and I don't think we should be NAKing this ad infinitum to teach you to
> become an i915 developer... unless you want to be one. ;)
> 
> > ---
> >  drivers/gpu/drm/i915/i915_dma.c    |   1 +
> >  drivers/gpu/drm/i915/i915_drv.h    |   5 ++
> >  drivers/gpu/drm/i915/intel_audio.c | 138
> +++++++++++++++++++++++++++++++++++++
> >  3 files changed, 144 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_dma.c
> b/drivers/gpu/drm/i915/i915_dma.c
> > index 097d4ba..8ffb5dc 100644
> > --- a/drivers/gpu/drm/i915/i915_dma.c
> > +++ b/drivers/gpu/drm/i915/i915_dma.c
> > @@ -858,6 +858,7 @@ int i915_driver_load(struct drm_device *dev,
> unsigned long flags)
> >  	mutex_init(&dev_priv->sb_lock);
> >  	mutex_init(&dev_priv->modeset_restore_lock);
> >  	mutex_init(&dev_priv->csr_lock);
> > +	mutex_init(&dev_priv->av_mutex);
> >
> >  	intel_pm_setup(dev);
> >
> > diff --git a/drivers/gpu/drm/i915/i915_drv.h
> b/drivers/gpu/drm/i915/i915_drv.h
> > index 05ffd5a..2c6b76f 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > @@ -1882,6 +1882,11 @@ struct drm_i915_private {
> >
> >  	/* hda/i915 audio component */
> >  	bool audio_component_registered;
> > +	/**
> > +	 * av_mutex - mutex for audio/video sync
> > +	 *
> > +	 */
> > +	struct mutex av_mutex;
> >
> >  	uint32_t hw_context_size;
> >  	struct list_head context_list;
> > diff --git a/drivers/gpu/drm/i915/intel_audio.c
> b/drivers/gpu/drm/i915/intel_audio.c
> > index dc32cf4..a021720 100644
> > --- a/drivers/gpu/drm/i915/intel_audio.c
> > +++ b/drivers/gpu/drm/i915/intel_audio.c
> > @@ -68,6 +68,31 @@ static const struct {
> >  	{ 148500, AUD_CONFIG_PIXEL_CLOCK_HDMI_148500 },
> >  };
> >
> > +/* HDMI N/CTS table */
> > +#define TMDS_297M 297000
> > +#define TMDS_296M DIV_ROUND_UP(297000 * 1000, 1001)
> > +static const struct {
> > +	int sample_rate;
> > +	int clock;
> > +	int n;
> > +	int cts;
> > +} aud_ncts[] = {
> > +	{ 44100, TMDS_296M, 4459, 234375 },
> > +	{ 44100, TMDS_297M, 4704, 247500 },
> > +	{ 48000, TMDS_296M, 5824, 281250 },
> > +	{ 48000, TMDS_297M, 5120, 247500 },
> > +	{ 32000, TMDS_296M, 5824, 421875 },
> > +	{ 32000, TMDS_297M, 3072, 222750 },
> > +	{ 88200, TMDS_296M, 8918, 234375 },
> > +	{ 88200, TMDS_297M, 9408, 247500 },
> > +	{ 96000, TMDS_296M, 11648, 281250 },
> > +	{ 96000, TMDS_297M, 10240, 247500 },
> > +	{ 176400, TMDS_296M, 17836, 234375 },
> > +	{ 176400, TMDS_297M, 18816, 247500 },
> > +	{ 192000, TMDS_296M, 23296, 281250 },
> > +	{ 192000, TMDS_297M, 20480, 247500 },
> > +};
> 
> Okay, I admit, I did not look these up in the spec. *blush*. I'm sure
> Ville has/will. ;)
> 
> > +
> >  /* get AUD_CONFIG_PIXEL_CLOCK_HDMI_* value for mode */
> >  static u32 audio_config_hdmi_pixel_clock(struct drm_display_mode
> *mode)
> >  {
> > @@ -90,6 +115,31 @@ static u32
> audio_config_hdmi_pixel_clock(struct drm_display_mode *mode)
> >  	return hdmi_audio_clock[i].config;
> >  }
> >
> > +static int audio_config_get_n(const struct drm_display_mode
> *mode, int rate)
> > +{
> > +	int i;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(aud_ncts); i++) {
> > +		if ((rate == aud_ncts[i].sample_rate) &&
> > +			(mode->clock == aud_ncts[i].clock)) {
> > +			return aud_ncts[i].n;
> > +		}
> > +	}
> > +	return 0;
> > +}
> > +
> > +/* check whether N/CTS/M need be set manually */
> > +static bool audio_rate_need_prog(struct intel_crtc *crtc,
> > +					struct drm_display_mode
> *mode)
> > +{
> > +	if (((mode->clock == TMDS_297M) ||
> > +		 (mode->clock == TMDS_296M)) &&
> > +		intel_pipe_has_type(crtc, INTEL_OUTPUT_HDMI))
> > +		return true;
> > +	else
> > +		return false;
> > +}
> > +
> >  static bool intel_eld_uptodate(struct drm_connector *connector,
> >  			       int reg_eldv, uint32_t bits_eldv,
> >  			       int reg_elda, uint32_t bits_elda,
> > @@ -184,6 +234,8 @@ static void hsw_audio_codec_disable(struct
> intel_encoder *encoder)
> >
> >  	DRM_DEBUG_KMS("Disable audio codec on pipe %c\n",
> pipe_name(pipe));
> >
> > +	mutex_lock(&dev_priv->av_mutex);
> > +
> 
> Bikeshed. We should think about moving the locking to
> intel_audio_codec_enable and intel_audio_codec_disable for
> consistency. We'll be adding new platform hooks eventually anyway,
> no
> need to duplicate the locking everywhere.

Yes, at first, I want to add the mutex in intel_audio_codec_enable,
but after a second thought, we don't need it for ilk_xxx and g4x_xxx,
so I moved the lock in the hsw specific function for efficiency. 

I will move it to intel_audio_codec_enable in next version.

> 
> >  	/* Disable timestamps */
> >  	tmp = I915_READ(HSW_AUD_CFG(pipe));
> >  	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
> > @@ -199,6 +251,8 @@ static void hsw_audio_codec_disable(struct
> intel_encoder *encoder)
> >  	tmp &= ~AUDIO_ELD_VALID(pipe);
> >  	tmp &= ~AUDIO_OUTPUT_ENABLE(pipe);
> >  	I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);
> > +
> > +	mutex_unlock(&dev_priv->av_mutex);
> >  }
> >
> >  static void hsw_audio_codec_enable(struct drm_connector
> *connector,
> > @@ -215,6 +269,8 @@ static void hsw_audio_codec_enable(struct
> drm_connector *connector,
> >  	DRM_DEBUG_KMS("Enable audio codec on pipe %c, %u bytes
> ELD\n",
> >  		      pipe_name(pipe), drm_eld_size(eld));
> >
> > +	mutex_lock(&dev_priv->av_mutex);
> > +
> >  	/* Enable audio presence detect, invalidate ELD */
> >  	tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
> >  	tmp |= AUDIO_OUTPUT_ENABLE(pipe);
> > @@ -253,6 +309,8 @@ static void hsw_audio_codec_enable(struct
> drm_connector *connector,
> >  	else
> >  		tmp |= audio_config_hdmi_pixel_clock(mode);
> >  	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> > +
> > +	mutex_unlock(&dev_priv->av_mutex);
> >  }
> >
> >  static void ilk_audio_codec_disable(struct intel_encoder *encoder)
> > @@ -514,12 +572,92 @@ static int
> i915_audio_component_get_cdclk_freq(struct device *dev)
> >  	return ret;
> >  }
> >
> > +static int i915_audio_component_sync_audio_rate(struct device
> *dev,
> > +						int port, int rate)
> > +{
> > +	struct drm_i915_private *dev_priv = dev_to_i915(dev);
> > +	struct drm_device *drm_dev = dev_priv->dev;
> > +	struct intel_encoder *intel_encoder;
> > +	struct intel_digital_port *intel_dig_port;
> > +	struct intel_crtc *crtc;
> > +	struct drm_display_mode *mode;
> > +	enum pipe pipe = -1;
> 
> Nitpick. Initialize to INVALID_PIPE.

Oh, yes, I will change it.

> 
> > +	u32 tmp;
> > +	int n_low, n_up, n;
> > +
> > +	/* HSW, BDW SKL need this fix */
> > +	if (!IS_SKYLAKE(dev_priv) &&
> > +		!IS_BROADWELL(dev_priv) &&
> > +		!IS_HASWELL(dev_priv))
> > +		return 0;
> 
> Nitpick. We should elaborate that a bit more. Is it basically that only
> the above platforms support HDMI mode and audio sample rate
> combinations
> that the automatic mode in hardware can't support? In other words,
> would
> audio_rate_need_prog() always return false on other platforms than
> hsw/bdw/skl? And if so, why do we have this check? Perhaps we
> should
> take care to make audio_rate_need_prog() do the right thing, and do
> that
> as the first thing here.

I add this judgement because the platforms are filed in our
internal document. Besides, the next gen may have such
issue and may not (the doc said MAY have such issue).
For easily extension, I add such judgement.

audio_rate_need_prog() means the specified clock need
such setting. But I'm not sure whether other old platforms
support such clock. If yes, the audio_rate_need_prog()
may be not enough. Although I think doing the setting
should be OK even on the platforms not listed in the doc.
But I have no platform to do the test, so I didn't include
other platform this time.

> 
> > +
> > +	mutex_lock(&dev_priv->av_mutex);
> > +	/* 1. get the pipe */
> > +	for_each_intel_encoder(drm_dev, intel_encoder) {
> > +		if (intel_encoder->type != INTEL_OUTPUT_HDMI)
> > +			continue;
> > +		intel_dig_port = enc_to_dig_port(&intel_encoder-
> >base);
> > +		if (port == intel_dig_port->port) {
> > +			crtc = to_intel_crtc(intel_encoder->base.crtc);
> > +			if (!crtc) {
> > +				DRM_DEBUG_KMS("%s: crtc is
> NULL\n", __func__);
> 
> DRM_DEBUG_KMS includes __func__ already.

I will change it in next version. Thanks. 
> 
> > +				continue;
> > +			}
> > +			pipe = crtc->pipe;
> > +			break;
> > +		}
> > +	}
> > +
> > +	if (pipe == INVALID_PIPE) {
> > +		DRM_DEBUG_KMS("no pipe for the port %c\n",
> port_name(port));
> > +		mutex_unlock(&dev_priv->av_mutex);
> > +		return -ENODEV;
> 
> Nitpick. I am not fond of early returns when cleanup like mutex unlock
> is required. The function should have goto labels at the end with
> cleanup. (OTOH if we move locking to higher level this problem goes
> away.)

OK, so it seems to move the lock in upper function is an easy
way. I will move the lock in the upper function.

> 
> > +	}
> > +	DRM_DEBUG_KMS("pipe %c connects port %c\n",
> > +				  pipe_name(pipe), port_name(port));
> > +	mode = &crtc->config->base.adjusted_mode;
> > +
> > +	/* 2. check whether to set the N/CTS/M manually or not */
> > +	if (!audio_rate_need_prog(crtc, mode)) {
> > +		tmp = I915_READ(HSW_AUD_CFG(pipe));
> > +		tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
> > +		I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> > +		mutex_unlock(&dev_priv->av_mutex);
> > +		return 0;
> 
> Nitpick. Same here, you could have an auto: label at the end with the
> auto programming...
> 
> > +	}
> > +
> > +	n = audio_config_get_n(mode, rate);
> > +	if (n == 0) {
> > +		DRM_DEBUG_KMS("Using automatic mode for N value
> on port %c\n",
> > +					  port_name(port));
> > +		tmp = I915_READ(HSW_AUD_CFG(pipe));
> > +		tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
> > +		I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> > +		mutex_unlock(&dev_priv->av_mutex);
> > +		return 0;
> 
> ...especially because this bit is duplicated for no good reason.
> 
> Fallback to auto mode if the mode isn't in the list is, I think, a good
> thing. Maybe it would deserve a DRM_ERROR, because clearly that
> shouldn't happen.

OK, I will add auto label for it. And I will use DRM_ERROR in next
version.

> 
> But it's actually the !audio_rate_need_prog case that makes me
> wonder. I
> think we've confirmed with the silicon folks that we can change N on
> the
> fly... but I'm actually not sure if we've confirmed that we can switch
> between automatic and manual modes on the fly. I think I've said it
> before, but I think I'd prefer it if we always used the manual mode
> anyway to reduce the complexity and have only one code path to
> debug,
> and that would also cover the somewhat of a corner case (but still real
> case) of switching between automatic/manual modes on the fly. And
> of
> course, this conflicts with what I said about the platform support check
> above, so needs thought.

I will check with silicon team. Based on our stress test, it seems
to be OK change mode on the fly.

We don't set for all the frequencies because there are so many
frequencies and platforms to do the stress test. We may need
a lot time to do the test. If the silicon team says we can't
change mode on the fly, I will change it in next version. If silicon
team says we can do it, I will use the HW auto mode for other 
frequencies. What do you think?

Regards,
Libin

> 
> > +	}
> > +	n_low = n & 0xfff;
> > +	n_up = (n >> 12) & 0xff;
> > +
> > +	/* 4. set the N/CTS/M */
> > +	tmp = I915_READ(HSW_AUD_CFG(pipe));
> > +	tmp &= ~(AUD_CONFIG_UPPER_N_MASK |
> AUD_CONFIG_LOWER_N_MASK);
> > +	tmp |= ((n_up << AUD_CONFIG_UPPER_N_SHIFT) |
> > +			(n_low << AUD_CONFIG_LOWER_N_SHIFT) |
> > +			AUD_CONFIG_N_PROG_ENABLE);
> > +	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> > +
> > +	mutex_unlock(&dev_priv->av_mutex);
> > +	return 0;
> > +}
> > +
> >  static const struct i915_audio_component_ops
> i915_audio_component_ops = {
> >  	.owner		= THIS_MODULE,
> >  	.get_power	= i915_audio_component_get_power,
> >  	.put_power	= i915_audio_component_put_power,
> >  	.codec_wake_override =
> i915_audio_component_codec_wake_override,
> >  	.get_cdclk_freq	= i915_audio_component_get_cdclk_freq,
> > +	.sync_audio_rate = i915_audio_component_sync_audio_rate,
> >  };
> >
> >  static int i915_audio_component_bind(struct device *i915_dev,
> > --
> > 1.9.1
> >
> 
> --
> Jani Nikula, Intel Open Source Technology Center
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Re: [PATCH v6 2/4] drm/i915: implement sync_audio_rate callback

[Jani Nikula]

On Wed, 02 Sep 2015, "Yang, Libin" <libin.yang@intel.com> wrote:
> Hi Jani,
>
>> -----Original Message-----
>> From: Jani Nikula [mailto:jani.nikula@linux.intel.com]
>> Sent: Wednesday, September 02, 2015 3:52 PM
>> To: Yang, Libin; alsa-devel@alsa-project.org; tiwai@suse.de; intel-
>> gfx@lists.freedesktop.org; daniel.vetter@ffwll.ch;
>> ville.syrjala@linux.intel.com
>> Cc: Yang, Libin
>> Subject: Re: [PATCH v6 2/4] drm/i915: implement sync_audio_rate
>> callback
>> 
>> On Wed, 02 Sep 2015, libin.yang@intel.com wrote:
>> > From: Libin Yang <libin.yang@intel.com>
>> >
>> > HDMI audio may not work at some frequencies
>> > with the HW provided N/CTS.
>> >
>> > This patch sets the proper N value for the
>> > given audio sample rate at the impacted frequencies.
>> > At other frequencies, it will use the N/CTS value
>> > which HW provides.
>> >
>> > Signed-off-by: Libin Yang <libin.yang@intel.com>
>> 
>> Okay, so there are a number of questions and comments this patch still
>> raises. Please find them inline.
>> 
>> *However*, we should really get this finally moving forward, and I
>> don't
>> think the issues are or need to be blockers, so this is
>> 
>> Reviewed-by: Jani Nikula <jani.nikula@intel.com>
>> 
>> I think we (as in i915 folks) can clean the rest of the bikeshedding up,
>> and I don't think we should be NAKing this ad infinitum to teach you to
>> become an i915 developer... unless you want to be one. ;)

Libin, I suggest taking that R-b now instead of writing a new version of
this patch if you want to get things upstreamed!

Please focus on patch 4.

BR,
Jani.


>> 
>> > ---
>> >  drivers/gpu/drm/i915/i915_dma.c    |   1 +
>> >  drivers/gpu/drm/i915/i915_drv.h    |   5 ++
>> >  drivers/gpu/drm/i915/intel_audio.c | 138
>> +++++++++++++++++++++++++++++++++++++
>> >  3 files changed, 144 insertions(+)
>> >
>> > diff --git a/drivers/gpu/drm/i915/i915_dma.c
>> b/drivers/gpu/drm/i915/i915_dma.c
>> > index 097d4ba..8ffb5dc 100644
>> > --- a/drivers/gpu/drm/i915/i915_dma.c
>> > +++ b/drivers/gpu/drm/i915/i915_dma.c
>> > @@ -858,6 +858,7 @@ int i915_driver_load(struct drm_device *dev,
>> unsigned long flags)
>> >  	mutex_init(&dev_priv->sb_lock);
>> >  	mutex_init(&dev_priv->modeset_restore_lock);
>> >  	mutex_init(&dev_priv->csr_lock);
>> > +	mutex_init(&dev_priv->av_mutex);
>> >
>> >  	intel_pm_setup(dev);
>> >
>> > diff --git a/drivers/gpu/drm/i915/i915_drv.h
>> b/drivers/gpu/drm/i915/i915_drv.h
>> > index 05ffd5a..2c6b76f 100644
>> > --- a/drivers/gpu/drm/i915/i915_drv.h
>> > +++ b/drivers/gpu/drm/i915/i915_drv.h
>> > @@ -1882,6 +1882,11 @@ struct drm_i915_private {
>> >
>> >  	/* hda/i915 audio component */
>> >  	bool audio_component_registered;
>> > +	/**
>> > +	 * av_mutex - mutex for audio/video sync
>> > +	 *
>> > +	 */
>> > +	struct mutex av_mutex;
>> >
>> >  	uint32_t hw_context_size;
>> >  	struct list_head context_list;
>> > diff --git a/drivers/gpu/drm/i915/intel_audio.c
>> b/drivers/gpu/drm/i915/intel_audio.c
>> > index dc32cf4..a021720 100644
>> > --- a/drivers/gpu/drm/i915/intel_audio.c
>> > +++ b/drivers/gpu/drm/i915/intel_audio.c
>> > @@ -68,6 +68,31 @@ static const struct {
>> >  	{ 148500, AUD_CONFIG_PIXEL_CLOCK_HDMI_148500 },
>> >  };
>> >
>> > +/* HDMI N/CTS table */
>> > +#define TMDS_297M 297000
>> > +#define TMDS_296M DIV_ROUND_UP(297000 * 1000, 1001)
>> > +static const struct {
>> > +	int sample_rate;
>> > +	int clock;
>> > +	int n;
>> > +	int cts;
>> > +} aud_ncts[] = {
>> > +	{ 44100, TMDS_296M, 4459, 234375 },
>> > +	{ 44100, TMDS_297M, 4704, 247500 },
>> > +	{ 48000, TMDS_296M, 5824, 281250 },
>> > +	{ 48000, TMDS_297M, 5120, 247500 },
>> > +	{ 32000, TMDS_296M, 5824, 421875 },
>> > +	{ 32000, TMDS_297M, 3072, 222750 },
>> > +	{ 88200, TMDS_296M, 8918, 234375 },
>> > +	{ 88200, TMDS_297M, 9408, 247500 },
>> > +	{ 96000, TMDS_296M, 11648, 281250 },
>> > +	{ 96000, TMDS_297M, 10240, 247500 },
>> > +	{ 176400, TMDS_296M, 17836, 234375 },
>> > +	{ 176400, TMDS_297M, 18816, 247500 },
>> > +	{ 192000, TMDS_296M, 23296, 281250 },
>> > +	{ 192000, TMDS_297M, 20480, 247500 },
>> > +};
>> 
>> Okay, I admit, I did not look these up in the spec. *blush*. I'm sure
>> Ville has/will. ;)
>> 
>> > +
>> >  /* get AUD_CONFIG_PIXEL_CLOCK_HDMI_* value for mode */
>> >  static u32 audio_config_hdmi_pixel_clock(struct drm_display_mode
>> *mode)
>> >  {
>> > @@ -90,6 +115,31 @@ static u32
>> audio_config_hdmi_pixel_clock(struct drm_display_mode *mode)
>> >  	return hdmi_audio_clock[i].config;
>> >  }
>> >
>> > +static int audio_config_get_n(const struct drm_display_mode
>> *mode, int rate)
>> > +{
>> > +	int i;
>> > +
>> > +	for (i = 0; i < ARRAY_SIZE(aud_ncts); i++) {
>> > +		if ((rate == aud_ncts[i].sample_rate) &&
>> > +			(mode->clock == aud_ncts[i].clock)) {
>> > +			return aud_ncts[i].n;
>> > +		}
>> > +	}
>> > +	return 0;
>> > +}
>> > +
>> > +/* check whether N/CTS/M need be set manually */
>> > +static bool audio_rate_need_prog(struct intel_crtc *crtc,
>> > +					struct drm_display_mode
>> *mode)
>> > +{
>> > +	if (((mode->clock == TMDS_297M) ||
>> > +		 (mode->clock == TMDS_296M)) &&
>> > +		intel_pipe_has_type(crtc, INTEL_OUTPUT_HDMI))
>> > +		return true;
>> > +	else
>> > +		return false;
>> > +}
>> > +
>> >  static bool intel_eld_uptodate(struct drm_connector *connector,
>> >  			       int reg_eldv, uint32_t bits_eldv,
>> >  			       int reg_elda, uint32_t bits_elda,
>> > @@ -184,6 +234,8 @@ static void hsw_audio_codec_disable(struct
>> intel_encoder *encoder)
>> >
>> >  	DRM_DEBUG_KMS("Disable audio codec on pipe %c\n",
>> pipe_name(pipe));
>> >
>> > +	mutex_lock(&dev_priv->av_mutex);
>> > +
>> 
>> Bikeshed. We should think about moving the locking to
>> intel_audio_codec_enable and intel_audio_codec_disable for
>> consistency. We'll be adding new platform hooks eventually anyway,
>> no
>> need to duplicate the locking everywhere.
>
> Yes, at first, I want to add the mutex in intel_audio_codec_enable,
> but after a second thought, we don't need it for ilk_xxx and g4x_xxx,
> so I moved the lock in the hsw specific function for efficiency. 
>
> I will move it to intel_audio_codec_enable in next version.
>
>> 
>> >  	/* Disable timestamps */
>> >  	tmp = I915_READ(HSW_AUD_CFG(pipe));
>> >  	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
>> > @@ -199,6 +251,8 @@ static void hsw_audio_codec_disable(struct
>> intel_encoder *encoder)
>> >  	tmp &= ~AUDIO_ELD_VALID(pipe);
>> >  	tmp &= ~AUDIO_OUTPUT_ENABLE(pipe);
>> >  	I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);
>> > +
>> > +	mutex_unlock(&dev_priv->av_mutex);
>> >  }
>> >
>> >  static void hsw_audio_codec_enable(struct drm_connector
>> *connector,
>> > @@ -215,6 +269,8 @@ static void hsw_audio_codec_enable(struct
>> drm_connector *connector,
>> >  	DRM_DEBUG_KMS("Enable audio codec on pipe %c, %u bytes
>> ELD\n",
>> >  		      pipe_name(pipe), drm_eld_size(eld));
>> >
>> > +	mutex_lock(&dev_priv->av_mutex);
>> > +
>> >  	/* Enable audio presence detect, invalidate ELD */
>> >  	tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
>> >  	tmp |= AUDIO_OUTPUT_ENABLE(pipe);
>> > @@ -253,6 +309,8 @@ static void hsw_audio_codec_enable(struct
>> drm_connector *connector,
>> >  	else
>> >  		tmp |= audio_config_hdmi_pixel_clock(mode);
>> >  	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
>> > +
>> > +	mutex_unlock(&dev_priv->av_mutex);
>> >  }
>> >
>> >  static void ilk_audio_codec_disable(struct intel_encoder *encoder)
>> > @@ -514,12 +572,92 @@ static int
>> i915_audio_component_get_cdclk_freq(struct device *dev)
>> >  	return ret;
>> >  }
>> >
>> > +static int i915_audio_component_sync_audio_rate(struct device
>> *dev,
>> > +						int port, int rate)
>> > +{
>> > +	struct drm_i915_private *dev_priv = dev_to_i915(dev);
>> > +	struct drm_device *drm_dev = dev_priv->dev;
>> > +	struct intel_encoder *intel_encoder;
>> > +	struct intel_digital_port *intel_dig_port;
>> > +	struct intel_crtc *crtc;
>> > +	struct drm_display_mode *mode;
>> > +	enum pipe pipe = -1;
>> 
>> Nitpick. Initialize to INVALID_PIPE.
>
> Oh, yes, I will change it.
>
>> 
>> > +	u32 tmp;
>> > +	int n_low, n_up, n;
>> > +
>> > +	/* HSW, BDW SKL need this fix */
>> > +	if (!IS_SKYLAKE(dev_priv) &&
>> > +		!IS_BROADWELL(dev_priv) &&
>> > +		!IS_HASWELL(dev_priv))
>> > +		return 0;
>> 
>> Nitpick. We should elaborate that a bit more. Is it basically that only
>> the above platforms support HDMI mode and audio sample rate
>> combinations
>> that the automatic mode in hardware can't support? In other words,
>> would
>> audio_rate_need_prog() always return false on other platforms than
>> hsw/bdw/skl? And if so, why do we have this check? Perhaps we
>> should
>> take care to make audio_rate_need_prog() do the right thing, and do
>> that
>> as the first thing here.
>
> I add this judgement because the platforms are filed in our
> internal document. Besides, the next gen may have such
> issue and may not (the doc said MAY have such issue).
> For easily extension, I add such judgement.
>
> audio_rate_need_prog() means the specified clock need
> such setting. But I'm not sure whether other old platforms
> support such clock. If yes, the audio_rate_need_prog()
> may be not enough. Although I think doing the setting
> should be OK even on the platforms not listed in the doc.
> But I have no platform to do the test, so I didn't include
> other platform this time.
>
>> 
>> > +
>> > +	mutex_lock(&dev_priv->av_mutex);
>> > +	/* 1. get the pipe */
>> > +	for_each_intel_encoder(drm_dev, intel_encoder) {
>> > +		if (intel_encoder->type != INTEL_OUTPUT_HDMI)
>> > +			continue;
>> > +		intel_dig_port = enc_to_dig_port(&intel_encoder-
>> >base);
>> > +		if (port == intel_dig_port->port) {
>> > +			crtc = to_intel_crtc(intel_encoder->base.crtc);
>> > +			if (!crtc) {
>> > +				DRM_DEBUG_KMS("%s: crtc is
>> NULL\n", __func__);
>> 
>> DRM_DEBUG_KMS includes __func__ already.
>
> I will change it in next version. Thanks. 
>> 
>> > +				continue;
>> > +			}
>> > +			pipe = crtc->pipe;
>> > +			break;
>> > +		}
>> > +	}
>> > +
>> > +	if (pipe == INVALID_PIPE) {
>> > +		DRM_DEBUG_KMS("no pipe for the port %c\n",
>> port_name(port));
>> > +		mutex_unlock(&dev_priv->av_mutex);
>> > +		return -ENODEV;
>> 
>> Nitpick. I am not fond of early returns when cleanup like mutex unlock
>> is required. The function should have goto labels at the end with
>> cleanup. (OTOH if we move locking to higher level this problem goes
>> away.)
>
> OK, so it seems to move the lock in upper function is an easy
> way. I will move the lock in the upper function.
>
>> 
>> > +	}
>> > +	DRM_DEBUG_KMS("pipe %c connects port %c\n",
>> > +				  pipe_name(pipe), port_name(port));
>> > +	mode = &crtc->config->base.adjusted_mode;
>> > +
>> > +	/* 2. check whether to set the N/CTS/M manually or not */
>> > +	if (!audio_rate_need_prog(crtc, mode)) {
>> > +		tmp = I915_READ(HSW_AUD_CFG(pipe));
>> > +		tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
>> > +		I915_WRITE(HSW_AUD_CFG(pipe), tmp);
>> > +		mutex_unlock(&dev_priv->av_mutex);
>> > +		return 0;
>> 
>> Nitpick. Same here, you could have an auto: label at the end with the
>> auto programming...
>> 
>> > +	}
>> > +
>> > +	n = audio_config_get_n(mode, rate);
>> > +	if (n == 0) {
>> > +		DRM_DEBUG_KMS("Using automatic mode for N value
>> on port %c\n",
>> > +					  port_name(port));
>> > +		tmp = I915_READ(HSW_AUD_CFG(pipe));
>> > +		tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
>> > +		I915_WRITE(HSW_AUD_CFG(pipe), tmp);
>> > +		mutex_unlock(&dev_priv->av_mutex);
>> > +		return 0;
>> 
>> ...especially because this bit is duplicated for no good reason.
>> 
>> Fallback to auto mode if the mode isn't in the list is, I think, a good
>> thing. Maybe it would deserve a DRM_ERROR, because clearly that
>> shouldn't happen.
>
> OK, I will add auto label for it. And I will use DRM_ERROR in next
> version.
>
>> 
>> But it's actually the !audio_rate_need_prog case that makes me
>> wonder. I
>> think we've confirmed with the silicon folks that we can change N on
>> the
>> fly... but I'm actually not sure if we've confirmed that we can switch
>> between automatic and manual modes on the fly. I think I've said it
>> before, but I think I'd prefer it if we always used the manual mode
>> anyway to reduce the complexity and have only one code path to
>> debug,
>> and that would also cover the somewhat of a corner case (but still real
>> case) of switching between automatic/manual modes on the fly. And
>> of
>> course, this conflicts with what I said about the platform support check
>> above, so needs thought.
>
> I will check with silicon team. Based on our stress test, it seems
> to be OK change mode on the fly.
>
> We don't set for all the frequencies because there are so many
> frequencies and platforms to do the stress test. We may need
> a lot time to do the test. If the silicon team says we can't
> change mode on the fly, I will change it in next version. If silicon
> team says we can do it, I will use the HW auto mode for other 
> frequencies. What do you think?
>
> Regards,
> Libin
>
>> 
>> > +	}
>> > +	n_low = n & 0xfff;
>> > +	n_up = (n >> 12) & 0xff;
>> > +
>> > +	/* 4. set the N/CTS/M */
>> > +	tmp = I915_READ(HSW_AUD_CFG(pipe));
>> > +	tmp &= ~(AUD_CONFIG_UPPER_N_MASK |
>> AUD_CONFIG_LOWER_N_MASK);
>> > +	tmp |= ((n_up << AUD_CONFIG_UPPER_N_SHIFT) |
>> > +			(n_low << AUD_CONFIG_LOWER_N_SHIFT) |
>> > +			AUD_CONFIG_N_PROG_ENABLE);
>> > +	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
>> > +
>> > +	mutex_unlock(&dev_priv->av_mutex);
>> > +	return 0;
>> > +}
>> > +
>> >  static const struct i915_audio_component_ops
>> i915_audio_component_ops = {
>> >  	.owner		= THIS_MODULE,
>> >  	.get_power	= i915_audio_component_get_power,
>> >  	.put_power	= i915_audio_component_put_power,
>> >  	.codec_wake_override =
>> i915_audio_component_codec_wake_override,
>> >  	.get_cdclk_freq	= i915_audio_component_get_cdclk_freq,
>> > +	.sync_audio_rate = i915_audio_component_sync_audio_rate,
>> >  };
>> >
>> >  static int i915_audio_component_bind(struct device *i915_dev,
>> > --
>> > 1.9.1
>> >
>> 
>> --
>> Jani Nikula, Intel Open Source Technology Center

-- 
Jani Nikula, Intel Open Source Technology Center
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Re: [PATCH v6 2/4] drm/i915: implement sync_audio_rate callback

[Yang, Libin]

Hi Jani,



> -----Original Message-----
> From: Jani Nikula [mailto:jani.nikula@linux.intel.com]
> Sent: Wednesday, September 02, 2015 4:42 PM
> To: Yang, Libin; alsa-devel@alsa-project.org; tiwai@suse.de; intel-
> gfx@lists.freedesktop.org; daniel.vetter@ffwll.ch;
> ville.syrjala@linux.intel.com
> Subject: RE: [PATCH v6 2/4] drm/i915: implement sync_audio_rate
> callback
> 
> On Wed, 02 Sep 2015, "Yang, Libin" <libin.yang@intel.com> wrote:
> > Hi Jani,
> >
> >> -----Original Message-----
> >> From: Jani Nikula [mailto:jani.nikula@linux.intel.com]
> >> Sent: Wednesday, September 02, 2015 3:52 PM
> >> To: Yang, Libin; alsa-devel@alsa-project.org; tiwai@suse.de; intel-
> >> gfx@lists.freedesktop.org; daniel.vetter@ffwll.ch;
> >> ville.syrjala@linux.intel.com
> >> Cc: Yang, Libin
> >> Subject: Re: [PATCH v6 2/4] drm/i915: implement sync_audio_rate
> >> callback
> >>
> >> On Wed, 02 Sep 2015, libin.yang@intel.com wrote:
> >> > From: Libin Yang <libin.yang@intel.com>
> >> >
> >> > HDMI audio may not work at some frequencies
> >> > with the HW provided N/CTS.
> >> >
> >> > This patch sets the proper N value for the
> >> > given audio sample rate at the impacted frequencies.
> >> > At other frequencies, it will use the N/CTS value
> >> > which HW provides.
> >> >
> >> > Signed-off-by: Libin Yang <libin.yang@intel.com>
> >>
> >> Okay, so there are a number of questions and comments this patch
> still
> >> raises. Please find them inline.
> >>
> >> *However*, we should really get this finally moving forward, and I
> >> don't
> >> think the issues are or need to be blockers, so this is
> >>
> >> Reviewed-by: Jani Nikula <jani.nikula@intel.com>
> >>
> >> I think we (as in i915 folks) can clean the rest of the bikeshedding up,
> >> and I don't think we should be NAKing this ad infinitum to teach you
> to
> >> become an i915 developer... unless you want to be one. ;)
> 
> Libin, I suggest taking that R-b now instead of writing a new version of
> this patch if you want to get things upstreamed!
> 
> Please focus on patch 4.

Oh, I didn't realize you mean this. Thanks. :) 

Regards,
Libin
> 
> BR,
> Jani.
> 
> 
> >>
> >> > ---
> >> >  drivers/gpu/drm/i915/i915_dma.c    |   1 +
> >> >  drivers/gpu/drm/i915/i915_drv.h    |   5 ++
> >> >  drivers/gpu/drm/i915/intel_audio.c | 138
> >> +++++++++++++++++++++++++++++++++++++
> >> >  3 files changed, 144 insertions(+)
> >> >
> >> > diff --git a/drivers/gpu/drm/i915/i915_dma.c
> >> b/drivers/gpu/drm/i915/i915_dma.c
> >> > index 097d4ba..8ffb5dc 100644
> >> > --- a/drivers/gpu/drm/i915/i915_dma.c
> >> > +++ b/drivers/gpu/drm/i915/i915_dma.c
> >> > @@ -858,6 +858,7 @@ int i915_driver_load(struct drm_device
> *dev,
> >> unsigned long flags)
> >> >  	mutex_init(&dev_priv->sb_lock);
> >> >  	mutex_init(&dev_priv->modeset_restore_lock);
> >> >  	mutex_init(&dev_priv->csr_lock);
> >> > +	mutex_init(&dev_priv->av_mutex);
> >> >
> >> >  	intel_pm_setup(dev);
> >> >
> >> > diff --git a/drivers/gpu/drm/i915/i915_drv.h
> >> b/drivers/gpu/drm/i915/i915_drv.h
> >> > index 05ffd5a..2c6b76f 100644
> >> > --- a/drivers/gpu/drm/i915/i915_drv.h
> >> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> >> > @@ -1882,6 +1882,11 @@ struct drm_i915_private {
> >> >
> >> >  	/* hda/i915 audio component */
> >> >  	bool audio_component_registered;
> >> > +	/**
> >> > +	 * av_mutex - mutex for audio/video sync
> >> > +	 *
> >> > +	 */
> >> > +	struct mutex av_mutex;
> >> >
> >> >  	uint32_t hw_context_size;
> >> >  	struct list_head context_list;
> >> > diff --git a/drivers/gpu/drm/i915/intel_audio.c
> >> b/drivers/gpu/drm/i915/intel_audio.c
> >> > index dc32cf4..a021720 100644
> >> > --- a/drivers/gpu/drm/i915/intel_audio.c
> >> > +++ b/drivers/gpu/drm/i915/intel_audio.c
> >> > @@ -68,6 +68,31 @@ static const struct {
> >> >  	{ 148500, AUD_CONFIG_PIXEL_CLOCK_HDMI_148500 },
> >> >  };
> >> >
> >> > +/* HDMI N/CTS table */
> >> > +#define TMDS_297M 297000
> >> > +#define TMDS_296M DIV_ROUND_UP(297000 * 1000, 1001)
> >> > +static const struct {
> >> > +	int sample_rate;
> >> > +	int clock;
> >> > +	int n;
> >> > +	int cts;
> >> > +} aud_ncts[] = {
> >> > +	{ 44100, TMDS_296M, 4459, 234375 },
> >> > +	{ 44100, TMDS_297M, 4704, 247500 },
> >> > +	{ 48000, TMDS_296M, 5824, 281250 },
> >> > +	{ 48000, TMDS_297M, 5120, 247500 },
> >> > +	{ 32000, TMDS_296M, 5824, 421875 },
> >> > +	{ 32000, TMDS_297M, 3072, 222750 },
> >> > +	{ 88200, TMDS_296M, 8918, 234375 },
> >> > +	{ 88200, TMDS_297M, 9408, 247500 },
> >> > +	{ 96000, TMDS_296M, 11648, 281250 },
> >> > +	{ 96000, TMDS_297M, 10240, 247500 },
> >> > +	{ 176400, TMDS_296M, 17836, 234375 },
> >> > +	{ 176400, TMDS_297M, 18816, 247500 },
> >> > +	{ 192000, TMDS_296M, 23296, 281250 },
> >> > +	{ 192000, TMDS_297M, 20480, 247500 },
> >> > +};
> >>
> >> Okay, I admit, I did not look these up in the spec. *blush*. I'm sure
> >> Ville has/will. ;)
> >>
> >> > +
> >> >  /* get AUD_CONFIG_PIXEL_CLOCK_HDMI_* value for mode */
> >> >  static u32 audio_config_hdmi_pixel_clock(struct
> drm_display_mode
> >> *mode)
> >> >  {
> >> > @@ -90,6 +115,31 @@ static u32
> >> audio_config_hdmi_pixel_clock(struct drm_display_mode *mode)
> >> >  	return hdmi_audio_clock[i].config;
> >> >  }
> >> >
> >> > +static int audio_config_get_n(const struct drm_display_mode
> >> *mode, int rate)
> >> > +{
> >> > +	int i;
> >> > +
> >> > +	for (i = 0; i < ARRAY_SIZE(aud_ncts); i++) {
> >> > +		if ((rate == aud_ncts[i].sample_rate) &&
> >> > +			(mode->clock == aud_ncts[i].clock)) {
> >> > +			return aud_ncts[i].n;
> >> > +		}
> >> > +	}
> >> > +	return 0;
> >> > +}
> >> > +
> >> > +/* check whether N/CTS/M need be set manually */
> >> > +static bool audio_rate_need_prog(struct intel_crtc *crtc,
> >> > +					struct drm_display_mode
> >> *mode)
> >> > +{
> >> > +	if (((mode->clock == TMDS_297M) ||
> >> > +		 (mode->clock == TMDS_296M)) &&
> >> > +		intel_pipe_has_type(crtc, INTEL_OUTPUT_HDMI))
> >> > +		return true;
> >> > +	else
> >> > +		return false;
> >> > +}
> >> > +
> >> >  static bool intel_eld_uptodate(struct drm_connector *connector,
> >> >  			       int reg_eldv, uint32_t bits_eldv,
> >> >  			       int reg_elda, uint32_t bits_elda,
> >> > @@ -184,6 +234,8 @@ static void
> hsw_audio_codec_disable(struct
> >> intel_encoder *encoder)
> >> >
> >> >  	DRM_DEBUG_KMS("Disable audio codec on pipe %c\n",
> >> pipe_name(pipe));
> >> >
> >> > +	mutex_lock(&dev_priv->av_mutex);
> >> > +
> >>
> >> Bikeshed. We should think about moving the locking to
> >> intel_audio_codec_enable and intel_audio_codec_disable for
> >> consistency. We'll be adding new platform hooks eventually anyway,
> >> no
> >> need to duplicate the locking everywhere.
> >
> > Yes, at first, I want to add the mutex in intel_audio_codec_enable,
> > but after a second thought, we don't need it for ilk_xxx and g4x_xxx,
> > so I moved the lock in the hsw specific function for efficiency.
> >
> > I will move it to intel_audio_codec_enable in next version.
> >
> >>
> >> >  	/* Disable timestamps */
> >> >  	tmp = I915_READ(HSW_AUD_CFG(pipe));
> >> >  	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
> >> > @@ -199,6 +251,8 @@ static void
> hsw_audio_codec_disable(struct
> >> intel_encoder *encoder)
> >> >  	tmp &= ~AUDIO_ELD_VALID(pipe);
> >> >  	tmp &= ~AUDIO_OUTPUT_ENABLE(pipe);
> >> >  	I915_WRITE(HSW_AUD_PIN_ELD_CP_VLD, tmp);
> >> > +
> >> > +	mutex_unlock(&dev_priv->av_mutex);
> >> >  }
> >> >
> >> >  static void hsw_audio_codec_enable(struct drm_connector
> >> *connector,
> >> > @@ -215,6 +269,8 @@ static void
> hsw_audio_codec_enable(struct
> >> drm_connector *connector,
> >> >  	DRM_DEBUG_KMS("Enable audio codec on pipe %c, %u bytes
> >> ELD\n",
> >> >  		      pipe_name(pipe), drm_eld_size(eld));
> >> >
> >> > +	mutex_lock(&dev_priv->av_mutex);
> >> > +
> >> >  	/* Enable audio presence detect, invalidate ELD */
> >> >  	tmp = I915_READ(HSW_AUD_PIN_ELD_CP_VLD);
> >> >  	tmp |= AUDIO_OUTPUT_ENABLE(pipe);
> >> > @@ -253,6 +309,8 @@ static void
> hsw_audio_codec_enable(struct
> >> drm_connector *connector,
> >> >  	else
> >> >  		tmp |= audio_config_hdmi_pixel_clock(mode);
> >> >  	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> >> > +
> >> > +	mutex_unlock(&dev_priv->av_mutex);
> >> >  }
> >> >
> >> >  static void ilk_audio_codec_disable(struct intel_encoder
> *encoder)
> >> > @@ -514,12 +572,92 @@ static int
> >> i915_audio_component_get_cdclk_freq(struct device *dev)
> >> >  	return ret;
> >> >  }
> >> >
> >> > +static int i915_audio_component_sync_audio_rate(struct device
> >> *dev,
> >> > +						int port, int rate)
> >> > +{
> >> > +	struct drm_i915_private *dev_priv = dev_to_i915(dev);
> >> > +	struct drm_device *drm_dev = dev_priv->dev;
> >> > +	struct intel_encoder *intel_encoder;
> >> > +	struct intel_digital_port *intel_dig_port;
> >> > +	struct intel_crtc *crtc;
> >> > +	struct drm_display_mode *mode;
> >> > +	enum pipe pipe = -1;
> >>
> >> Nitpick. Initialize to INVALID_PIPE.
> >
> > Oh, yes, I will change it.
> >
> >>
> >> > +	u32 tmp;
> >> > +	int n_low, n_up, n;
> >> > +
> >> > +	/* HSW, BDW SKL need this fix */
> >> > +	if (!IS_SKYLAKE(dev_priv) &&
> >> > +		!IS_BROADWELL(dev_priv) &&
> >> > +		!IS_HASWELL(dev_priv))
> >> > +		return 0;
> >>
> >> Nitpick. We should elaborate that a bit more. Is it basically that only
> >> the above platforms support HDMI mode and audio sample rate
> >> combinations
> >> that the automatic mode in hardware can't support? In other words,
> >> would
> >> audio_rate_need_prog() always return false on other platforms
> than
> >> hsw/bdw/skl? And if so, why do we have this check? Perhaps we
> >> should
> >> take care to make audio_rate_need_prog() do the right thing, and
> do
> >> that
> >> as the first thing here.
> >
> > I add this judgement because the platforms are filed in our
> > internal document. Besides, the next gen may have such
> > issue and may not (the doc said MAY have such issue).
> > For easily extension, I add such judgement.
> >
> > audio_rate_need_prog() means the specified clock need
> > such setting. But I'm not sure whether other old platforms
> > support such clock. If yes, the audio_rate_need_prog()
> > may be not enough. Although I think doing the setting
> > should be OK even on the platforms not listed in the doc.
> > But I have no platform to do the test, so I didn't include
> > other platform this time.
> >
> >>
> >> > +
> >> > +	mutex_lock(&dev_priv->av_mutex);
> >> > +	/* 1. get the pipe */
> >> > +	for_each_intel_encoder(drm_dev, intel_encoder) {
> >> > +		if (intel_encoder->type != INTEL_OUTPUT_HDMI)
> >> > +			continue;
> >> > +		intel_dig_port = enc_to_dig_port(&intel_encoder-
> >> >base);
> >> > +		if (port == intel_dig_port->port) {
> >> > +			crtc = to_intel_crtc(intel_encoder->base.crtc);
> >> > +			if (!crtc) {
> >> > +				DRM_DEBUG_KMS("%s: crtc is
> >> NULL\n", __func__);
> >>
> >> DRM_DEBUG_KMS includes __func__ already.
> >
> > I will change it in next version. Thanks.
> >>
> >> > +				continue;
> >> > +			}
> >> > +			pipe = crtc->pipe;
> >> > +			break;
> >> > +		}
> >> > +	}
> >> > +
> >> > +	if (pipe == INVALID_PIPE) {
> >> > +		DRM_DEBUG_KMS("no pipe for the port %c\n",
> >> port_name(port));
> >> > +		mutex_unlock(&dev_priv->av_mutex);
> >> > +		return -ENODEV;
> >>
> >> Nitpick. I am not fond of early returns when cleanup like mutex
> unlock
> >> is required. The function should have goto labels at the end with
> >> cleanup. (OTOH if we move locking to higher level this problem
> goes
> >> away.)
> >
> > OK, so it seems to move the lock in upper function is an easy
> > way. I will move the lock in the upper function.
> >
> >>
> >> > +	}
> >> > +	DRM_DEBUG_KMS("pipe %c connects port %c\n",
> >> > +				  pipe_name(pipe), port_name(port));
> >> > +	mode = &crtc->config->base.adjusted_mode;
> >> > +
> >> > +	/* 2. check whether to set the N/CTS/M manually or not */
> >> > +	if (!audio_rate_need_prog(crtc, mode)) {
> >> > +		tmp = I915_READ(HSW_AUD_CFG(pipe));
> >> > +		tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
> >> > +		I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> >> > +		mutex_unlock(&dev_priv->av_mutex);
> >> > +		return 0;
> >>
> >> Nitpick. Same here, you could have an auto: label at the end with
> the
> >> auto programming...
> >>
> >> > +	}
> >> > +
> >> > +	n = audio_config_get_n(mode, rate);
> >> > +	if (n == 0) {
> >> > +		DRM_DEBUG_KMS("Using automatic mode for N value
> >> on port %c\n",
> >> > +					  port_name(port));
> >> > +		tmp = I915_READ(HSW_AUD_CFG(pipe));
> >> > +		tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
> >> > +		I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> >> > +		mutex_unlock(&dev_priv->av_mutex);
> >> > +		return 0;
> >>
> >> ...especially because this bit is duplicated for no good reason.
> >>
> >> Fallback to auto mode if the mode isn't in the list is, I think, a good
> >> thing. Maybe it would deserve a DRM_ERROR, because clearly that
> >> shouldn't happen.
> >
> > OK, I will add auto label for it. And I will use DRM_ERROR in next
> > version.
> >
> >>
> >> But it's actually the !audio_rate_need_prog case that makes me
> >> wonder. I
> >> think we've confirmed with the silicon folks that we can change N
> on
> >> the
> >> fly... but I'm actually not sure if we've confirmed that we can switch
> >> between automatic and manual modes on the fly. I think I've said it
> >> before, but I think I'd prefer it if we always used the manual mode
> >> anyway to reduce the complexity and have only one code path to
> >> debug,
> >> and that would also cover the somewhat of a corner case (but still
> real
> >> case) of switching between automatic/manual modes on the fly.
> And
> >> of
> >> course, this conflicts with what I said about the platform support
> check
> >> above, so needs thought.
> >
> > I will check with silicon team. Based on our stress test, it seems
> > to be OK change mode on the fly.
> >
> > We don't set for all the frequencies because there are so many
> > frequencies and platforms to do the stress test. We may need
> > a lot time to do the test. If the silicon team says we can't
> > change mode on the fly, I will change it in next version. If silicon
> > team says we can do it, I will use the HW auto mode for other
> > frequencies. What do you think?
> >
> > Regards,
> > Libin
> >
> >>
> >> > +	}
> >> > +	n_low = n & 0xfff;
> >> > +	n_up = (n >> 12) & 0xff;
> >> > +
> >> > +	/* 4. set the N/CTS/M */
> >> > +	tmp = I915_READ(HSW_AUD_CFG(pipe));
> >> > +	tmp &= ~(AUD_CONFIG_UPPER_N_MASK |
> >> AUD_CONFIG_LOWER_N_MASK);
> >> > +	tmp |= ((n_up << AUD_CONFIG_UPPER_N_SHIFT) |
> >> > +			(n_low << AUD_CONFIG_LOWER_N_SHIFT) |
> >> > +			AUD_CONFIG_N_PROG_ENABLE);
> >> > +	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> >> > +
> >> > +	mutex_unlock(&dev_priv->av_mutex);
> >> > +	return 0;
> >> > +}
> >> > +
> >> >  static const struct i915_audio_component_ops
> >> i915_audio_component_ops = {
> >> >  	.owner		= THIS_MODULE,
> >> >  	.get_power	= i915_audio_component_get_power,
> >> >  	.put_power	= i915_audio_component_put_power,
> >> >  	.codec_wake_override =
> >> i915_audio_component_codec_wake_override,
> >> >  	.get_cdclk_freq	= i915_audio_component_get_cdclk_freq,
> >> > +	.sync_audio_rate = i915_audio_component_sync_audio_rate,
> >> >  };
> >> >
> >> >  static int i915_audio_component_bind(struct device *i915_dev,
> >> > --
> >> > 1.9.1
> >> >
> >>
> >> --
> >> Jani Nikula, Intel Open Source Technology Center
> 
> --
> Jani Nikula, Intel Open Source Technology Center
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[PATCH v6 3/4] ALSA: hda - display audio call sync_audio_rate callback

[libin.yang]

From: Libin Yang <libin.yang@intel.com>

For display audio, call the sync_audio_rate callback function
to do the synchronization between gfx driver and audio driver.

Signed-off-by: Libin Yang <libin.yang@intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
---
 sound/pci/hda/patch_hdmi.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index a97db5f..1668868 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1770,6 +1770,16 @@ static bool check_non_pcm_per_cvt(struct hda_codec *codec, hda_nid_t cvt_nid)
 	return non_pcm;
 }
 
+/* There is a fixed mapping between audio pin node and display port
+ * on current Intel platforms:
+ * Pin Widget 5 - PORT B (port = 1 in i915 driver)
+ * Pin Widget 6 - PORT C (port = 2 in i915 driver)
+ * Pin Widget 7 - PORT D (port = 3 in i915 driver)
+ */
+static int intel_pin2port(hda_nid_t pin_nid)
+{
+	return pin_nid - 4;
+}
 
 /*
  * HDMI callbacks
@@ -1786,6 +1796,8 @@ static int generic_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
 	int pin_idx = hinfo_to_pin_index(codec, hinfo);
 	struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx);
 	hda_nid_t pin_nid = per_pin->pin_nid;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct i915_audio_component *acomp = codec->bus->core.audio_component;
 	bool non_pcm;
 	int pinctl;
 
@@ -1802,6 +1814,13 @@ static int generic_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
 		intel_not_share_assigned_cvt(codec, pin_nid, per_pin->mux_idx);
 	}
 
+	/* Call sync_audio_rate to set the N/CTS/M manually if necessary */
+	/* Todo: add DP1.2 MST audio support later */
+	if (acomp && acomp->ops && acomp->ops->sync_audio_rate)
+		acomp->ops->sync_audio_rate(acomp->dev,
+				intel_pin2port(pin_nid),
+				runtime->rate);
+
 	non_pcm = check_non_pcm_per_cvt(codec, cvt_nid);
 	mutex_lock(&per_pin->lock);
 	per_pin->channels = substream->runtime->channels;
-- 
1.9.1

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[PATCH v6 4/4] drm/i915: set proper N/CTS in modeset

[libin.yang]

From: Libin Yang <libin.yang@intel.com>

When modeset occurs and the TMDS frequency is set to some
speical values, the N/CTS need to be set manually if audio
is playing.

Signed-off-by: Libin Yang <libin.yang@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h    |  8 ++++++++
 drivers/gpu/drm/i915/intel_audio.c | 40 +++++++++++++++++++++++++++++++++++++-
 2 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index ae7fa3e..5bdee36 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7058,6 +7058,8 @@ enum skl_disp_power_wells {
 					_HSW_AUD_MISC_CTRL_A, \
 					_HSW_AUD_MISC_CTRL_B)
 
+#define HSW_AUD_PIPE_CONN_SEL_CTRL  0x650ac
+
 #define _HSW_AUD_DIP_ELD_CTRL_ST_A	0x650b4
 #define _HSW_AUD_DIP_ELD_CTRL_ST_B	0x651b4
 #define HSW_AUD_DIP_ELD_CTRL(pipe) _PIPE(pipe, \
@@ -7072,6 +7074,12 @@ enum skl_disp_power_wells {
 					_HSW_AUD_DIG_CNVT_2)
 #define DIP_PORT_SEL_MASK		0x3
 
+#define _HSW_AUD_STR_DESC_1		0x65084
+#define _HSW_AUD_STR_DESC_2		0x65184
+#define AUD_STR_DESC(pipe)	_PIPE(pipe, \
+					 _HSW_AUD_STR_DESC_1,	\
+					 _HSW_AUD_STR_DESC_2)
+
 #define _HSW_AUD_EDID_DATA_A		0x65050
 #define _HSW_AUD_EDID_DATA_B		0x65150
 #define HSW_AUD_EDID_DATA(pipe) _PIPE(pipe, \
diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
index a021720..acdb68c 100644
--- a/drivers/gpu/drm/i915/intel_audio.c
+++ b/drivers/gpu/drm/i915/intel_audio.c
@@ -140,6 +140,27 @@ static bool audio_rate_need_prog(struct intel_crtc *crtc,
 		return false;
 }
 
+static int audio_config_get_rate(struct drm_i915_private *dev_priv,
+						enum pipe pipe)
+{
+	uint32_t tmp;
+	int cvt_idx;
+	int base_rate, mul, div, rate;
+
+	tmp = I915_READ(HSW_AUD_PIPE_CONN_SEL_CTRL);
+	cvt_idx = (tmp >> (pipe * 8)) & 0xff;
+	tmp = I915_READ(AUD_STR_DESC(cvt_idx));
+	base_rate = tmp & (1 << 14);
+	if (base_rate == 0)
+		rate = 48000;
+	else
+		rate = 44100;
+	mul = (tmp & (0x7 << 11)) + 1;
+	div = (tmp & (0x7 << 8)) + 1;
+	rate = rate * mul / div;
+	return rate;
+}
+
 static bool intel_eld_uptodate(struct drm_connector *connector,
 			       int reg_eldv, uint32_t bits_eldv,
 			       int reg_elda, uint32_t bits_elda,
@@ -265,6 +286,8 @@ static void hsw_audio_codec_enable(struct drm_connector *connector,
 	const uint8_t *eld = connector->eld;
 	uint32_t tmp;
 	int len, i;
+	int n_low, n_up, n;
+	int rate;
 
 	DRM_DEBUG_KMS("Enable audio codec on pipe %c, %u bytes ELD\n",
 		      pipe_name(pipe), drm_eld_size(eld));
@@ -302,12 +325,27 @@ static void hsw_audio_codec_enable(struct drm_connector *connector,
 	/* Enable timestamps */
 	tmp = I915_READ(HSW_AUD_CFG(pipe));
 	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
-	tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
 	tmp &= ~AUD_CONFIG_PIXEL_CLOCK_HDMI_MASK;
 	if (intel_pipe_has_type(intel_crtc, INTEL_OUTPUT_DISPLAYPORT))
 		tmp |= AUD_CONFIG_N_VALUE_INDEX;
 	else
 		tmp |= audio_config_hdmi_pixel_clock(mode);
+
+	tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
+	if (audio_rate_need_prog(intel_crtc, mode)) {
+		rate = audio_config_get_rate(dev_priv, pipe);
+		n = audio_config_get_n(mode, rate);
+		if (n != 0) {
+			n_low = n & 0xfff;
+			n_up = (n >> 12) & 0xff;
+			tmp &= ~(AUD_CONFIG_UPPER_N_MASK |
+					 AUD_CONFIG_LOWER_N_MASK);
+			tmp |= ((n_up << AUD_CONFIG_UPPER_N_SHIFT) |
+					(n_low << AUD_CONFIG_LOWER_N_SHIFT) |
+					AUD_CONFIG_N_PROG_ENABLE);
+		}
+	}
+
 	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
 
 	mutex_unlock(&dev_priv->av_mutex);
-- 
1.9.1

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Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset

[Jani Nikula]

On Wed, 02 Sep 2015, libin.yang@intel.com wrote:
> From: Libin Yang <libin.yang@intel.com>
>
> When modeset occurs and the TMDS frequency is set to some
> speical values, the N/CTS need to be set manually if audio
> is playing.

Do we still need this patch after David Henningsson's series [1]? IIUC
you will now always get the callback on modesets, so you should be able
to, uh, callback on the callback to set audio rate. Granted, with this I
suppose you reduce the time there might be wrong N/CTS after enable.

Some other comments inline.

[1] http://mid.gmane.org/1440781350-12053-1-git-send-email-david.henningsson@canonical.com

>
> Signed-off-by: Libin Yang <libin.yang@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h    |  8 ++++++++
>  drivers/gpu/drm/i915/intel_audio.c | 40 +++++++++++++++++++++++++++++++++++++-
>  2 files changed, 47 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index ae7fa3e..5bdee36 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -7058,6 +7058,8 @@ enum skl_disp_power_wells {
>  					_HSW_AUD_MISC_CTRL_A, \
>  					_HSW_AUD_MISC_CTRL_B)
>  
> +#define HSW_AUD_PIPE_CONN_SEL_CTRL  0x650ac

Nitpick. The bit fields are not defined.

> +
>  #define _HSW_AUD_DIP_ELD_CTRL_ST_A	0x650b4
>  #define _HSW_AUD_DIP_ELD_CTRL_ST_B	0x651b4
>  #define HSW_AUD_DIP_ELD_CTRL(pipe) _PIPE(pipe, \
> @@ -7072,6 +7074,12 @@ enum skl_disp_power_wells {
>  					_HSW_AUD_DIG_CNVT_2)
>  #define DIP_PORT_SEL_MASK		0x3
>  
> +#define _HSW_AUD_STR_DESC_1		0x65084
> +#define _HSW_AUD_STR_DESC_2		0x65184
> +#define AUD_STR_DESC(pipe)	_PIPE(pipe, \
> +					 _HSW_AUD_STR_DESC_1,	\
> +					 _HSW_AUD_STR_DESC_2)

Nitpick. The bit fields are not defined. I think it's fine to use _PIPE
macro, but you should probably use "converter" or "cvt" or something for
the parameter name to not mislead people into thinking this is pipe
based.

> +
>  #define _HSW_AUD_EDID_DATA_A		0x65050
>  #define _HSW_AUD_EDID_DATA_B		0x65150
>  #define HSW_AUD_EDID_DATA(pipe) _PIPE(pipe, \
> diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
> index a021720..acdb68c 100644
> --- a/drivers/gpu/drm/i915/intel_audio.c
> +++ b/drivers/gpu/drm/i915/intel_audio.c
> @@ -140,6 +140,27 @@ static bool audio_rate_need_prog(struct intel_crtc *crtc,
>  		return false;
>  }
>  
> +static int audio_config_get_rate(struct drm_i915_private *dev_priv,
> +						enum pipe pipe)
> +{
> +	uint32_t tmp;
> +	int cvt_idx;
> +	int base_rate, mul, div, rate;
> +
> +	tmp = I915_READ(HSW_AUD_PIPE_CONN_SEL_CTRL);
> +	cvt_idx = (tmp >> (pipe * 8)) & 0xff;

This one needs to be addressed. Are you sure it's indexed by pipe? The
spec is vague.

Bits 7:0 are "control B", 15:8 are "control C", and so on, while your
(tmp >> (pipe * 8)) maps pipe A to control B, pipe B to control C,
etc. This would speak for port, not pipe, as pipe A should be valid
while port A not.

> +	tmp = I915_READ(AUD_STR_DESC(cvt_idx));
> +	base_rate = tmp & (1 << 14);

Nitpick. We prefer (tmp & MASK) >> SHIFT.

> +	if (base_rate == 0)
> +		rate = 48000;
> +	else
> +		rate = 44100;
> +	mul = (tmp & (0x7 << 11)) + 1;
> +	div = (tmp & (0x7 << 8)) + 1;

This one needs to be addressed. This is bogus. The +1 would work if you
actually did (tmp & MASK) >> SHIFT, but now you add it to the shifted
value. Your multipliers and divisors are *way* off.

NAK on this patch.

> +	rate = rate * mul / div;
> +	return rate;
> +}
> +
>  static bool intel_eld_uptodate(struct drm_connector *connector,
>  			       int reg_eldv, uint32_t bits_eldv,
>  			       int reg_elda, uint32_t bits_elda,
> @@ -265,6 +286,8 @@ static void hsw_audio_codec_enable(struct drm_connector *connector,
>  	const uint8_t *eld = connector->eld;
>  	uint32_t tmp;
>  	int len, i;
> +	int n_low, n_up, n;
> +	int rate;
>  
>  	DRM_DEBUG_KMS("Enable audio codec on pipe %c, %u bytes ELD\n",
>  		      pipe_name(pipe), drm_eld_size(eld));
> @@ -302,12 +325,27 @@ static void hsw_audio_codec_enable(struct drm_connector *connector,
>  	/* Enable timestamps */
>  	tmp = I915_READ(HSW_AUD_CFG(pipe));
>  	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
> -	tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
>  	tmp &= ~AUD_CONFIG_PIXEL_CLOCK_HDMI_MASK;
>  	if (intel_pipe_has_type(intel_crtc, INTEL_OUTPUT_DISPLAYPORT))
>  		tmp |= AUD_CONFIG_N_VALUE_INDEX;
>  	else
>  		tmp |= audio_config_hdmi_pixel_clock(mode);
> +
> +	tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
> +	if (audio_rate_need_prog(intel_crtc, mode)) {
> +		rate = audio_config_get_rate(dev_priv, pipe);
> +		n = audio_config_get_n(mode, rate);
> +		if (n != 0) {
> +			n_low = n & 0xfff;
> +			n_up = (n >> 12) & 0xff;
> +			tmp &= ~(AUD_CONFIG_UPPER_N_MASK |
> +					 AUD_CONFIG_LOWER_N_MASK);
> +			tmp |= ((n_up << AUD_CONFIG_UPPER_N_SHIFT) |
> +					(n_low << AUD_CONFIG_LOWER_N_SHIFT) |
> +					AUD_CONFIG_N_PROG_ENABLE);

Nitpick. I'd prefer some sharing with the similar blocks from the
earlier patch. Also a debug message on n == 0 would be nice; you
probably didn't notice your audio_config_get_rate() wasn't working right
because this silently fell back to the automatic mode here.

> +		}
> +	}
> +
>  	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
>  
>  	mutex_unlock(&dev_priv->av_mutex);
> -- 
> 1.9.1
>

-- 
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Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset

[Yang, Libin]

Hi Jani,

> -----Original Message-----
> From: Jani Nikula [mailto:jani.nikula@linux.intel.com]
> Sent: Wednesday, September 02, 2015 4:20 PM
> To: Yang, Libin; alsa-devel@alsa-project.org; tiwai@suse.de; intel-
> gfx@lists.freedesktop.org; daniel.vetter@ffwll.ch;
> ville.syrjala@linux.intel.com
> Cc: Yang, Libin
> Subject: Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset
> 
> On Wed, 02 Sep 2015, libin.yang@intel.com wrote:
> > From: Libin Yang <libin.yang@intel.com>
> >
> > When modeset occurs and the TMDS frequency is set to some
> > speical values, the N/CTS need to be set manually if audio
> > is playing.
> 
> Do we still need this patch after David Henningsson's series [1]? IIUC
> you will now always get the callback on modesets, so you should be
> able
> to, uh, callback on the callback to set audio rate. Granted, with this I
> suppose you reduce the time there might be wrong N/CTS after enable.

Yes, we need. David's patch will not trigger the sync_audio_rate
callback.

> 
> Some other comments inline.
> 
> [1] http://mid.gmane.org/1440781350-12053-1-git-send-email-
> david.henningsson@canonical.com
> 
> >
> > Signed-off-by: Libin Yang <libin.yang@intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_reg.h    |  8 ++++++++
> >  drivers/gpu/drm/i915/intel_audio.c | 40
> +++++++++++++++++++++++++++++++++++++-
> >  2 files changed, 47 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h
> b/drivers/gpu/drm/i915/i915_reg.h
> > index ae7fa3e..5bdee36 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -7058,6 +7058,8 @@ enum skl_disp_power_wells {
> >  					_HSW_AUD_MISC_CTRL_A, \
> >  					_HSW_AUD_MISC_CTRL_B)
> >
> > +#define HSW_AUD_PIPE_CONN_SEL_CTRL  0x650ac
> 
> Nitpick. The bit fields are not defined.

OK, I will add the bit definition. 

> 
> > +
> >  #define _HSW_AUD_DIP_ELD_CTRL_ST_A	0x650b4
> >  #define _HSW_AUD_DIP_ELD_CTRL_ST_B	0x651b4
> >  #define HSW_AUD_DIP_ELD_CTRL(pipe) _PIPE(pipe, \
> > @@ -7072,6 +7074,12 @@ enum skl_disp_power_wells {
> >  					_HSW_AUD_DIG_CNVT_2)
> >  #define DIP_PORT_SEL_MASK		0x3
> >
> > +#define _HSW_AUD_STR_DESC_1		0x65084
> > +#define _HSW_AUD_STR_DESC_2		0x65184
> > +#define AUD_STR_DESC(pipe)	_PIPE(pipe, \
> > +					 _HSW_AUD_STR_DESC_1,
> 	\
> > +					 _HSW_AUD_STR_DESC_2)
> 
> Nitpick. The bit fields are not defined. I think it's fine to use _PIPE
> macro, but you should probably use "converter" or "cvt" or something
> for
> the parameter name to not mislead people into thinking this is pipe
> based.

Do you mean it should be like:
_PIPE(cvt, _HSW_AUD_STR_DESC_1, ...) ?

> 
> > +
> >  #define _HSW_AUD_EDID_DATA_A		0x65050
> >  #define _HSW_AUD_EDID_DATA_B		0x65150
> >  #define HSW_AUD_EDID_DATA(pipe) _PIPE(pipe, \
> > diff --git a/drivers/gpu/drm/i915/intel_audio.c
> b/drivers/gpu/drm/i915/intel_audio.c
> > index a021720..acdb68c 100644
> > --- a/drivers/gpu/drm/i915/intel_audio.c
> > +++ b/drivers/gpu/drm/i915/intel_audio.c
> > @@ -140,6 +140,27 @@ static bool audio_rate_need_prog(struct
> intel_crtc *crtc,
> >  		return false;
> >  }
> >
> > +static int audio_config_get_rate(struct drm_i915_private *dev_priv,
> > +						enum pipe pipe)
> > +{
> > +	uint32_t tmp;
> > +	int cvt_idx;
> > +	int base_rate, mul, div, rate;
> > +
> > +	tmp = I915_READ(HSW_AUD_PIPE_CONN_SEL_CTRL);
> > +	cvt_idx = (tmp >> (pipe * 8)) & 0xff;
> 
> This one needs to be addressed. Are you sure it's indexed by pipe? The
> spec is vague.

Yes, I did lot of test to confirm it.

> 
> Bits 7:0 are "control B", 15:8 are "control C", and so on, while your
> (tmp >> (pipe * 8)) maps pipe A to control B, pipe B to control C,
> etc. This would speak for port, not pipe, as pipe A should be valid
> while port A not.

We found there is something wrong/or vague in the spec.

> 
> > +	tmp = I915_READ(AUD_STR_DESC(cvt_idx));
> > +	base_rate = tmp & (1 << 14);
> 
> Nitpick. We prefer (tmp & MASK) >> SHIFT.

OK, I will change it.

> 
> > +	if (base_rate == 0)
> > +		rate = 48000;
> > +	else
> > +		rate = 44100;
> > +	mul = (tmp & (0x7 << 11)) + 1;
> > +	div = (tmp & (0x7 << 8)) + 1;
> 
> This one needs to be addressed. This is bogus. The +1 would work if
> you
> actually did (tmp & MASK) >> SHIFT, but now you add it to the shifted
> value. Your multipliers and divisors are *way* off.

OK, I will check it and change the patch.
> 
> NAK on this patch.
> 
> > +	rate = rate * mul / div;
> > +	return rate;
> > +}
> > +
> >  static bool intel_eld_uptodate(struct drm_connector *connector,
> >  			       int reg_eldv, uint32_t bits_eldv,
> >  			       int reg_elda, uint32_t bits_elda,
> > @@ -265,6 +286,8 @@ static void hsw_audio_codec_enable(struct
> drm_connector *connector,
> >  	const uint8_t *eld = connector->eld;
> >  	uint32_t tmp;
> >  	int len, i;
> > +	int n_low, n_up, n;
> > +	int rate;
> >
> >  	DRM_DEBUG_KMS("Enable audio codec on pipe %c, %u bytes
> ELD\n",
> >  		      pipe_name(pipe), drm_eld_size(eld));
> > @@ -302,12 +325,27 @@ static void
> hsw_audio_codec_enable(struct drm_connector *connector,
> >  	/* Enable timestamps */
> >  	tmp = I915_READ(HSW_AUD_CFG(pipe));
> >  	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
> > -	tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
> >  	tmp &= ~AUD_CONFIG_PIXEL_CLOCK_HDMI_MASK;
> >  	if (intel_pipe_has_type(intel_crtc,
> INTEL_OUTPUT_DISPLAYPORT))
> >  		tmp |= AUD_CONFIG_N_VALUE_INDEX;
> >  	else
> >  		tmp |= audio_config_hdmi_pixel_clock(mode);
> > +
> > +	tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
> > +	if (audio_rate_need_prog(intel_crtc, mode)) {
> > +		rate = audio_config_get_rate(dev_priv, pipe);
> > +		n = audio_config_get_n(mode, rate);
> > +		if (n != 0) {
> > +			n_low = n & 0xfff;
> > +			n_up = (n >> 12) & 0xff;
> > +			tmp &= ~(AUD_CONFIG_UPPER_N_MASK |
> > +
> AUD_CONFIG_LOWER_N_MASK);
> > +			tmp |= ((n_up <<
> AUD_CONFIG_UPPER_N_SHIFT) |
> > +					(n_low <<
> AUD_CONFIG_LOWER_N_SHIFT) |
> > +
> 	AUD_CONFIG_N_PROG_ENABLE);
> 
> Nitpick. I'd prefer some sharing with the similar blocks from the
> earlier patch. Also a debug message on n == 0 would be nice; you
> probably didn't notice your audio_config_get_rate() wasn't working
> right
> because this silently fell back to the automatic mode here.

OK, I will add the msg. As you and Ville are insisting on
sharing code, I will do it in next version.

Regards,
Libin
> 
> > +		}
> > +	}
> > +
> >  	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> >
> >  	mutex_unlock(&dev_priv->av_mutex);
> > --
> > 1.9.1
> >
> 
> --
> Jani Nikula, Intel Open Source Technology Center
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Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset

[Jani Nikula]

On Wed, 02 Sep 2015, "Yang, Libin" <libin.yang@intel.com> wrote:
> Hi Jani,
>
>> -----Original Message-----
>> From: Jani Nikula [mailto:jani.nikula@linux.intel.com]
>> Sent: Wednesday, September 02, 2015 4:20 PM
>> To: Yang, Libin; alsa-devel@alsa-project.org; tiwai@suse.de; intel-
>> gfx@lists.freedesktop.org; daniel.vetter@ffwll.ch;
>> ville.syrjala@linux.intel.com
>> Cc: Yang, Libin
>> Subject: Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset
>> 
>> On Wed, 02 Sep 2015, libin.yang@intel.com wrote:
>> > From: Libin Yang <libin.yang@intel.com>
>> >
>> > When modeset occurs and the TMDS frequency is set to some
>> > speical values, the N/CTS need to be set manually if audio
>> > is playing.
>> 
>> Do we still need this patch after David Henningsson's series [1]? IIUC
>> you will now always get the callback on modesets, so you should be
>> able
>> to, uh, callback on the callback to set audio rate. Granted, with this I
>> suppose you reduce the time there might be wrong N/CTS after enable.
>
> Yes, we need. David's patch will not trigger the sync_audio_rate
> callback.

Okay.

>
>> 
>> Some other comments inline.
>> 
>> [1] http://mid.gmane.org/1440781350-12053-1-git-send-email-
>> david.henningsson@canonical.com
>> 
>> >
>> > Signed-off-by: Libin Yang <libin.yang@intel.com>
>> > ---
>> >  drivers/gpu/drm/i915/i915_reg.h    |  8 ++++++++
>> >  drivers/gpu/drm/i915/intel_audio.c | 40
>> +++++++++++++++++++++++++++++++++++++-
>> >  2 files changed, 47 insertions(+), 1 deletion(-)
>> >
>> > diff --git a/drivers/gpu/drm/i915/i915_reg.h
>> b/drivers/gpu/drm/i915/i915_reg.h
>> > index ae7fa3e..5bdee36 100644
>> > --- a/drivers/gpu/drm/i915/i915_reg.h
>> > +++ b/drivers/gpu/drm/i915/i915_reg.h
>> > @@ -7058,6 +7058,8 @@ enum skl_disp_power_wells {
>> >  					_HSW_AUD_MISC_CTRL_A, \
>> >  					_HSW_AUD_MISC_CTRL_B)
>> >
>> > +#define HSW_AUD_PIPE_CONN_SEL_CTRL  0x650ac
>> 
>> Nitpick. The bit fields are not defined.
>
> OK, I will add the bit definition. 
>
>> 
>> > +
>> >  #define _HSW_AUD_DIP_ELD_CTRL_ST_A	0x650b4
>> >  #define _HSW_AUD_DIP_ELD_CTRL_ST_B	0x651b4
>> >  #define HSW_AUD_DIP_ELD_CTRL(pipe) _PIPE(pipe, \
>> > @@ -7072,6 +7074,12 @@ enum skl_disp_power_wells {
>> >  					_HSW_AUD_DIG_CNVT_2)
>> >  #define DIP_PORT_SEL_MASK		0x3
>> >
>> > +#define _HSW_AUD_STR_DESC_1		0x65084
>> > +#define _HSW_AUD_STR_DESC_2		0x65184
>> > +#define AUD_STR_DESC(pipe)	_PIPE(pipe, \
>> > +					 _HSW_AUD_STR_DESC_1,
>> 	\
>> > +					 _HSW_AUD_STR_DESC_2)
>> 
>> Nitpick. The bit fields are not defined. I think it's fine to use _PIPE
>> macro, but you should probably use "converter" or "cvt" or something
>> for
>> the parameter name to not mislead people into thinking this is pipe
>> based.
>
> Do you mean it should be like:
> _PIPE(cvt, _HSW_AUD_STR_DESC_1, ...) ?

Yes.

>
>> 
>> > +
>> >  #define _HSW_AUD_EDID_DATA_A		0x65050
>> >  #define _HSW_AUD_EDID_DATA_B		0x65150
>> >  #define HSW_AUD_EDID_DATA(pipe) _PIPE(pipe, \
>> > diff --git a/drivers/gpu/drm/i915/intel_audio.c
>> b/drivers/gpu/drm/i915/intel_audio.c
>> > index a021720..acdb68c 100644
>> > --- a/drivers/gpu/drm/i915/intel_audio.c
>> > +++ b/drivers/gpu/drm/i915/intel_audio.c
>> > @@ -140,6 +140,27 @@ static bool audio_rate_need_prog(struct
>> intel_crtc *crtc,
>> >  		return false;
>> >  }
>> >
>> > +static int audio_config_get_rate(struct drm_i915_private *dev_priv,
>> > +						enum pipe pipe)
>> > +{
>> > +	uint32_t tmp;
>> > +	int cvt_idx;
>> > +	int base_rate, mul, div, rate;
>> > +
>> > +	tmp = I915_READ(HSW_AUD_PIPE_CONN_SEL_CTRL);
>> > +	cvt_idx = (tmp >> (pipe * 8)) & 0xff;
>> 
>> This one needs to be addressed. Are you sure it's indexed by pipe? The
>> spec is vague.
>
> Yes, I did lot of test to confirm it.
>
>> 
>> Bits 7:0 are "control B", 15:8 are "control C", and so on, while your
>> (tmp >> (pipe * 8)) maps pipe A to control B, pipe B to control C,
>> etc. This would speak for port, not pipe, as pipe A should be valid
>> while port A not.
>
> We found there is something wrong/or vague in the spec.

Indeed.

>
>> 
>> > +	tmp = I915_READ(AUD_STR_DESC(cvt_idx));
>> > +	base_rate = tmp & (1 << 14);
>> 
>> Nitpick. We prefer (tmp & MASK) >> SHIFT.
>
> OK, I will change it.
>
>> 
>> > +	if (base_rate == 0)
>> > +		rate = 48000;
>> > +	else
>> > +		rate = 44100;
>> > +	mul = (tmp & (0x7 << 11)) + 1;
>> > +	div = (tmp & (0x7 << 8)) + 1;
>> 
>> This one needs to be addressed. This is bogus. The +1 would work if
>> you
>> actually did (tmp & MASK) >> SHIFT, but now you add it to the shifted
>> value. Your multipliers and divisors are *way* off.
>
> OK, I will check it and change the patch.
>> 
>> NAK on this patch.
>> 
>> > +	rate = rate * mul / div;
>> > +	return rate;
>> > +}
>> > +
>> >  static bool intel_eld_uptodate(struct drm_connector *connector,
>> >  			       int reg_eldv, uint32_t bits_eldv,
>> >  			       int reg_elda, uint32_t bits_elda,
>> > @@ -265,6 +286,8 @@ static void hsw_audio_codec_enable(struct
>> drm_connector *connector,
>> >  	const uint8_t *eld = connector->eld;
>> >  	uint32_t tmp;
>> >  	int len, i;
>> > +	int n_low, n_up, n;
>> > +	int rate;
>> >
>> >  	DRM_DEBUG_KMS("Enable audio codec on pipe %c, %u bytes
>> ELD\n",
>> >  		      pipe_name(pipe), drm_eld_size(eld));
>> > @@ -302,12 +325,27 @@ static void
>> hsw_audio_codec_enable(struct drm_connector *connector,
>> >  	/* Enable timestamps */
>> >  	tmp = I915_READ(HSW_AUD_CFG(pipe));
>> >  	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
>> > -	tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
>> >  	tmp &= ~AUD_CONFIG_PIXEL_CLOCK_HDMI_MASK;
>> >  	if (intel_pipe_has_type(intel_crtc,
>> INTEL_OUTPUT_DISPLAYPORT))
>> >  		tmp |= AUD_CONFIG_N_VALUE_INDEX;
>> >  	else
>> >  		tmp |= audio_config_hdmi_pixel_clock(mode);
>> > +
>> > +	tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
>> > +	if (audio_rate_need_prog(intel_crtc, mode)) {
>> > +		rate = audio_config_get_rate(dev_priv, pipe);
>> > +		n = audio_config_get_n(mode, rate);
>> > +		if (n != 0) {
>> > +			n_low = n & 0xfff;
>> > +			n_up = (n >> 12) & 0xff;
>> > +			tmp &= ~(AUD_CONFIG_UPPER_N_MASK |
>> > +
>> AUD_CONFIG_LOWER_N_MASK);
>> > +			tmp |= ((n_up <<
>> AUD_CONFIG_UPPER_N_SHIFT) |
>> > +					(n_low <<
>> AUD_CONFIG_LOWER_N_SHIFT) |
>> > +
>> 	AUD_CONFIG_N_PROG_ENABLE);
>> 
>> Nitpick. I'd prefer some sharing with the similar blocks from the
>> earlier patch. Also a debug message on n == 0 would be nice; you
>> probably didn't notice your audio_config_get_rate() wasn't working
>> right
>> because this silently fell back to the automatic mode here.
>
> OK, I will add the msg. As you and Ville are insisting on
> sharing code, I will do it in next version.

Well, really, I'm fine with having that part duplicated as-is for now,
we can fix it later. More important to focus on getting
audio_config_get_rate() right.

I don't know if you're still targeting v4.3 with this (up to Takashi I
guess) we'll really need to wrap this up soon.

BR,
Jani.

>
> Regards,
> Libin
>> 
>> > +		}
>> > +	}
>> > +
>> >  	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
>> >
>> >  	mutex_unlock(&dev_priv->av_mutex);
>> > --
>> > 1.9.1
>> >
>> 
>> --
>> Jani Nikula, Intel Open Source Technology Center

-- 
Jani Nikula, Intel Open Source Technology Center
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Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset

[Takashi Iwai]

On Wed, 02 Sep 2015 11:02:42 +0200,
Jani Nikula wrote:
> 
> >> Nitpick. I'd prefer some sharing with the similar blocks from the
> >> earlier patch. Also a debug message on n == 0 would be nice; you
> >> probably didn't notice your audio_config_get_rate() wasn't working
> >> right
> >> because this silently fell back to the automatic mode here.
> >
> > OK, I will add the msg. As you and Ville are insisting on
> > sharing code, I will do it in next version.
> 
> Well, really, I'm fine with having that part duplicated as-is for now,
> we can fix it later. More important to focus on getting
> audio_config_get_rate() right.
> 
> I don't know if you're still targeting v4.3 with this (up to Takashi I
> guess) we'll really need to wrap this up soon.

I'm in favor of merging this into 4.3, so it'd be appreciated if Libin
can prepare the fixed version soonish, indeed.


thanks,

Takashi
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Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset

[Jani Nikula]

On Wed, 02 Sep 2015, Takashi Iwai <tiwai@suse.de> wrote:
> On Wed, 02 Sep 2015 11:02:42 +0200,
> Jani Nikula wrote:
>> 
>> >> Nitpick. I'd prefer some sharing with the similar blocks from the
>> >> earlier patch. Also a debug message on n == 0 would be nice; you
>> >> probably didn't notice your audio_config_get_rate() wasn't working
>> >> right
>> >> because this silently fell back to the automatic mode here.
>> >
>> > OK, I will add the msg. As you and Ville are insisting on
>> > sharing code, I will do it in next version.
>> 
>> Well, really, I'm fine with having that part duplicated as-is for now,
>> we can fix it later. More important to focus on getting
>> audio_config_get_rate() right.
>> 
>> I don't know if you're still targeting v4.3 with this (up to Takashi I
>> guess) we'll really need to wrap this up soon.
>
> I'm in favor of merging this into 4.3, so it'd be appreciated if Libin
> can prepare the fixed version soonish, indeed.

IIUC patches 1-3 would be useful on their own already, and a fixed
version of patch 4 could follow. Just a thought.

BR,
Jani.

>
>
> thanks,
>
> Takashi

-- 
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Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset

[Takashi Iwai]

On Wed, 02 Sep 2015 15:44:34 +0200,
Jani Nikula wrote:
> 
> On Wed, 02 Sep 2015, Takashi Iwai <tiwai@suse.de> wrote:
> > On Wed, 02 Sep 2015 11:02:42 +0200,
> > Jani Nikula wrote:
> >> 
> >> >> Nitpick. I'd prefer some sharing with the similar blocks from the
> >> >> earlier patch. Also a debug message on n == 0 would be nice; you
> >> >> probably didn't notice your audio_config_get_rate() wasn't working
> >> >> right
> >> >> because this silently fell back to the automatic mode here.
> >> >
> >> > OK, I will add the msg. As you and Ville are insisting on
> >> > sharing code, I will do it in next version.
> >> 
> >> Well, really, I'm fine with having that part duplicated as-is for now,
> >> we can fix it later. More important to focus on getting
> >> audio_config_get_rate() right.
> >> 
> >> I don't know if you're still targeting v4.3 with this (up to Takashi I
> >> guess) we'll really need to wrap this up soon.
> >
> > I'm in favor of merging this into 4.3, so it'd be appreciated if Libin
> > can prepare the fixed version soonish, indeed.
> 
> IIUC patches 1-3 would be useful on their own already, and a fixed
> version of patch 4 could follow. Just a thought.

That's good, then I can take the first three patches.

Daniel, would you like to review these three before I merge them?
I assumed your previous mail as a kind of ack to this series, too.


thanks,

Takashi
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Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset

[Daniel Vetter]

On Wed, Sep 02, 2015 at 03:46:40PM +0200, Takashi Iwai wrote:
> On Wed, 02 Sep 2015 15:44:34 +0200,
> Jani Nikula wrote:
> > 
> > On Wed, 02 Sep 2015, Takashi Iwai <tiwai@suse.de> wrote:
> > > On Wed, 02 Sep 2015 11:02:42 +0200,
> > > Jani Nikula wrote:
> > >> 
> > >> >> Nitpick. I'd prefer some sharing with the similar blocks from the
> > >> >> earlier patch. Also a debug message on n == 0 would be nice; you
> > >> >> probably didn't notice your audio_config_get_rate() wasn't working
> > >> >> right
> > >> >> because this silently fell back to the automatic mode here.
> > >> >
> > >> > OK, I will add the msg. As you and Ville are insisting on
> > >> > sharing code, I will do it in next version.
> > >> 
> > >> Well, really, I'm fine with having that part duplicated as-is for now,
> > >> we can fix it later. More important to focus on getting
> > >> audio_config_get_rate() right.
> > >> 
> > >> I don't know if you're still targeting v4.3 with this (up to Takashi I
> > >> guess) we'll really need to wrap this up soon.
> > >
> > > I'm in favor of merging this into 4.3, so it'd be appreciated if Libin
> > > can prepare the fixed version soonish, indeed.
> > 
> > IIUC patches 1-3 would be useful on their own already, and a fixed
> > version of patch 4 could follow. Just a thought.
> 
> That's good, then I can take the first three patches.
> 
> Daniel, would you like to review these three before I merge them?
> I assumed your previous mail as a kind of ack to this series, too.

fwiw ack on that plan, but given how much I made a mess out of these two
series and mixed them up I wouldn't trust me anyway ;-)

Once the code settles I'll rebase/backmerge so that I can apply the
follow-up documentation/kerneldoc work that's still getting done.

Cheers, Daniel
-- 
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Software Engineer, Intel Corporation
http://blog.ffwll.ch
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Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset

[Takashi Iwai]

On Wed, 02 Sep 2015 17:22:01 +0200,
Daniel Vetter wrote:
> 
> On Wed, Sep 02, 2015 at 03:46:40PM +0200, Takashi Iwai wrote:
> > On Wed, 02 Sep 2015 15:44:34 +0200,
> > Jani Nikula wrote:
> > > 
> > > On Wed, 02 Sep 2015, Takashi Iwai <tiwai@suse.de> wrote:
> > > > On Wed, 02 Sep 2015 11:02:42 +0200,
> > > > Jani Nikula wrote:
> > > >> 
> > > >> >> Nitpick. I'd prefer some sharing with the similar blocks from the
> > > >> >> earlier patch. Also a debug message on n == 0 would be nice; you
> > > >> >> probably didn't notice your audio_config_get_rate() wasn't working
> > > >> >> right
> > > >> >> because this silently fell back to the automatic mode here.
> > > >> >
> > > >> > OK, I will add the msg. As you and Ville are insisting on
> > > >> > sharing code, I will do it in next version.
> > > >> 
> > > >> Well, really, I'm fine with having that part duplicated as-is for now,
> > > >> we can fix it later. More important to focus on getting
> > > >> audio_config_get_rate() right.
> > > >> 
> > > >> I don't know if you're still targeting v4.3 with this (up to Takashi I
> > > >> guess) we'll really need to wrap this up soon.
> > > >
> > > > I'm in favor of merging this into 4.3, so it'd be appreciated if Libin
> > > > can prepare the fixed version soonish, indeed.
> > > 
> > > IIUC patches 1-3 would be useful on their own already, and a fixed
> > > version of patch 4 could follow. Just a thought.
> > 
> > That's good, then I can take the first three patches.
> > 
> > Daniel, would you like to review these three before I merge them?
> > I assumed your previous mail as a kind of ack to this series, too.
> 
> fwiw ack on that plan, but given how much I made a mess out of these two
> series and mixed them up I wouldn't trust me anyway ;-)
> 
> Once the code settles I'll rebase/backmerge so that I can apply the
> follow-up documentation/kerneldoc work that's still getting done.

FYI, I've pushed a branch including Libin's patchset (but only patches
1-3) just for checking.  Let me know if this looks OK.


Takashi
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Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset

[Yang, Libin]

> -----Original Message-----
> From: Takashi Iwai [mailto:tiwai@suse.de]
> Sent: Wednesday, September 02, 2015 11:36 PM
> To: Daniel Vetter
> Cc: Jani Nikula; Yang, Libin; alsa-devel@alsa-project.org; intel-
> gfx@lists.freedesktop.org; daniel.vetter@ffwll.ch;
> ville.syrjala@linux.intel.com
> Subject: Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset
> 
> On Wed, 02 Sep 2015 17:22:01 +0200,
> Daniel Vetter wrote:
> >
> > On Wed, Sep 02, 2015 at 03:46:40PM +0200, Takashi Iwai wrote:
> > > On Wed, 02 Sep 2015 15:44:34 +0200,
> > > Jani Nikula wrote:
> > > >
> > > > On Wed, 02 Sep 2015, Takashi Iwai <tiwai@suse.de> wrote:
> > > > > On Wed, 02 Sep 2015 11:02:42 +0200,
> > > > > Jani Nikula wrote:
> > > > >>
> > > > >> >> Nitpick. I'd prefer some sharing with the similar blocks from
> the
> > > > >> >> earlier patch. Also a debug message on n == 0 would be
> nice; you
> > > > >> >> probably didn't notice your audio_config_get_rate() wasn't
> working
> > > > >> >> right
> > > > >> >> because this silently fell back to the automatic mode here.
> > > > >> >
> > > > >> > OK, I will add the msg. As you and Ville are insisting on
> > > > >> > sharing code, I will do it in next version.
> > > > >>
> > > > >> Well, really, I'm fine with having that part duplicated as-is for
> now,
> > > > >> we can fix it later. More important to focus on getting
> > > > >> audio_config_get_rate() right.
> > > > >>
> > > > >> I don't know if you're still targeting v4.3 with this (up to
> Takashi I
> > > > >> guess) we'll really need to wrap this up soon.
> > > > >
> > > > > I'm in favor of merging this into 4.3, so it'd be appreciated if
> Libin
> > > > > can prepare the fixed version soonish, indeed.
> > > >
> > > > IIUC patches 1-3 would be useful on their own already, and a
> fixed
> > > > version of patch 4 could follow. Just a thought.
> > >
> > > That's good, then I can take the first three patches.
> > >
> > > Daniel, would you like to review these three before I merge them?
> > > I assumed your previous mail as a kind of ack to this series, too.
> >
> > fwiw ack on that plan, but given how much I made a mess out of
> these two
> > series and mixed them up I wouldn't trust me anyway ;-)
> >
> > Once the code settles I'll rebase/backmerge so that I can apply the
> > follow-up documentation/kerneldoc work that's still getting done.
> 
> FYI, I've pushed a branch including Libin's patchset (but only patches
> 1-3) just for checking.  Let me know if this looks OK.

Thanks, Takashi, Daniel, Jani and Ville.

So I need submit the 4th patch only next time, right?

> 
> 
> Takashi
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Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset

[Takashi Iwai]

On Fri, 04 Sep 2015 03:56:26 +0200,
Yang, Libin wrote:
> 
> 
> > -----Original Message-----
> > From: Takashi Iwai [mailto:tiwai@suse.de]
> > Sent: Wednesday, September 02, 2015 11:36 PM
> > To: Daniel Vetter
> > Cc: Jani Nikula; Yang, Libin; alsa-devel@alsa-project.org; intel-
> > gfx@lists.freedesktop.org; daniel.vetter@ffwll.ch;
> > ville.syrjala@linux.intel.com
> > Subject: Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset
> > 
> > On Wed, 02 Sep 2015 17:22:01 +0200,
> > Daniel Vetter wrote:
> > >
> > > On Wed, Sep 02, 2015 at 03:46:40PM +0200, Takashi Iwai wrote:
> > > > On Wed, 02 Sep 2015 15:44:34 +0200,
> > > > Jani Nikula wrote:
> > > > >
> > > > > On Wed, 02 Sep 2015, Takashi Iwai <tiwai@suse.de> wrote:
> > > > > > On Wed, 02 Sep 2015 11:02:42 +0200,
> > > > > > Jani Nikula wrote:
> > > > > >>
> > > > > >> >> Nitpick. I'd prefer some sharing with the similar blocks from
> > the
> > > > > >> >> earlier patch. Also a debug message on n == 0 would be
> > nice; you
> > > > > >> >> probably didn't notice your audio_config_get_rate() wasn't
> > working
> > > > > >> >> right
> > > > > >> >> because this silently fell back to the automatic mode here.
> > > > > >> >
> > > > > >> > OK, I will add the msg. As you and Ville are insisting on
> > > > > >> > sharing code, I will do it in next version.
> > > > > >>
> > > > > >> Well, really, I'm fine with having that part duplicated as-is for
> > now,
> > > > > >> we can fix it later. More important to focus on getting
> > > > > >> audio_config_get_rate() right.
> > > > > >>
> > > > > >> I don't know if you're still targeting v4.3 with this (up to
> > Takashi I
> > > > > >> guess) we'll really need to wrap this up soon.
> > > > > >
> > > > > > I'm in favor of merging this into 4.3, so it'd be appreciated if
> > Libin
> > > > > > can prepare the fixed version soonish, indeed.
> > > > >
> > > > > IIUC patches 1-3 would be useful on their own already, and a
> > fixed
> > > > > version of patch 4 could follow. Just a thought.
> > > >
> > > > That's good, then I can take the first three patches.
> > > >
> > > > Daniel, would you like to review these three before I merge them?
> > > > I assumed your previous mail as a kind of ack to this series, too.
> > >
> > > fwiw ack on that plan, but given how much I made a mess out of
> > these two
> > > series and mixed them up I wouldn't trust me anyway ;-)
> > >
> > > Once the code settles I'll rebase/backmerge so that I can apply the
> > > follow-up documentation/kerneldoc work that's still getting done.
> > 
> > FYI, I've pushed a branch including Libin's patchset (but only patches
> > 1-3) just for checking.  Let me know if this looks OK.
> 
> Thanks, Takashi, Daniel, Jani and Ville.
> 
> So I need submit the 4th patch only next time, right?

Yes.


Takashi
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Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset

[Jani Nikula]

On Wed, 02 Sep 2015, Takashi Iwai <tiwai@suse.de> wrote:
> On Wed, 02 Sep 2015 11:02:42 +0200,
> Jani Nikula wrote:
>> 
>> >> Nitpick. I'd prefer some sharing with the similar blocks from the
>> >> earlier patch. Also a debug message on n == 0 would be nice; you
>> >> probably didn't notice your audio_config_get_rate() wasn't working
>> >> right
>> >> because this silently fell back to the automatic mode here.
>> >
>> > OK, I will add the msg. As you and Ville are insisting on
>> > sharing code, I will do it in next version.
>> 
>> Well, really, I'm fine with having that part duplicated as-is for now,
>> we can fix it later. More important to focus on getting
>> audio_config_get_rate() right.
>> 
>> I don't know if you're still targeting v4.3 with this (up to Takashi I
>> guess) we'll really need to wrap this up soon.
>
> I'm in favor of merging this into 4.3, so it'd be appreciated if Libin
> can prepare the fixed version soonish, indeed.

Takashi, just to double check, none of this made it into v4.3 after all?

BR,
Jani.



>
>
> thanks,
>
> Takashi

-- 
Jani Nikula, Intel Open Source Technology Center

Re: [PATCH v6 4/4] drm/i915: set proper N/CTS in modeset

[Takashi Iwai]

On Mon, 19 Oct 2015 10:25:22 +0200,
Jani Nikula wrote:
> 
> On Wed, 02 Sep 2015, Takashi Iwai <tiwai@suse.de> wrote:
> > On Wed, 02 Sep 2015 11:02:42 +0200,
> > Jani Nikula wrote:
> >> 
> >> >> Nitpick. I'd prefer some sharing with the similar blocks from the
> >> >> earlier patch. Also a debug message on n == 0 would be nice; you
> >> >> probably didn't notice your audio_config_get_rate() wasn't working
> >> >> right
> >> >> because this silently fell back to the automatic mode here.
> >> >
> >> > OK, I will add the msg. As you and Ville are insisting on
> >> > sharing code, I will do it in next version.
> >> 
> >> Well, really, I'm fine with having that part duplicated as-is for now,
> >> we can fix it later. More important to focus on getting
> >> audio_config_get_rate() right.
> >> 
> >> I don't know if you're still targeting v4.3 with this (up to Takashi I
> >> guess) we'll really need to wrap this up soon.
> >
> > I'm in favor of merging this into 4.3, so it'd be appreciated if Libin
> > can prepare the fixed version soonish, indeed.
> 
> Takashi, just to double check, none of this made it into v4.3 after all?

Right, sync_audio_rate was slipped from 4.3 merge window,
unfortunately.


Takashi
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Re: [PATCH v6 1/4] drm/i915: Add audio sync_audio_rate callback

[Jani Nikula]

On Wed, 02 Sep 2015, libin.yang@intel.com wrote:
> From: Libin Yang <libin.yang@intel.com>
>
> Add the sync_audio_rate callback.
>
> With the callback, audio driver can trigger
> i915 driver to set the proper N/CTS or N/M
> based on different sample rates.
>
> Signed-off-by: Libin Yang <libin.yang@intel.com>

Reviewed-by: Jani Nikula <jani.nikula@intel.com>

> ---
>  include/drm/i915_component.h | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/include/drm/i915_component.h b/include/drm/i915_component.h
> index c9a8b64..8ad6f1b 100644
> --- a/include/drm/i915_component.h
> +++ b/include/drm/i915_component.h
> @@ -33,6 +33,13 @@ struct i915_audio_component {
>  		void (*put_power)(struct device *);
>  		void (*codec_wake_override)(struct device *, bool enable);
>  		int (*get_cdclk_freq)(struct device *);
> +		/**
> +		 * @sync_audio_rate: set n/cts based on the sample rate
> +		 *
> +		 * Called from audio driver. After audio driver sets the
> +		 * sample rate, it will call this function to set n/cts
> +		 */
> +		int (*sync_audio_rate)(struct device *, int port, int rate);
>  	} *ops;
>  };
>  
> -- 
> 1.9.1
>

-- 
Jani Nikula, Intel Open Source Technology Center
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