diff mbox series

[v15,03/11] drm/edid: Add cea_sad helpers for freq/length

Message ID 20220727045035.32225-4-rex-bc.chen@mediatek.com (mailing list archive)
State Handled Elsewhere
Headers show
Series drm/mediatek: Add MT8195 DisplayPort driver | expand

Commit Message

Rex-BC Chen (陳柏辰) July 27, 2022, 4:50 a.m. UTC 
From: Guillaume Ranquet <granquet@baylibre.com>

This patch adds two helper functions that extract the frequency and word
length from a struct cea_sad.

For these helper functions new defines are added that help translate the
'freq' and 'byte2' fields into real numbers.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
---
 drivers/gpu/drm/drm_edid.c | 63 ++++++++++++++++++++++++++++++++++++++
 include/drm/drm_edid.h     | 14 +++++++++
 2 files changed, 77 insertions(+)

Comments

AngeloGioacchino Del Regno July 27, 2022, 9:34 a.m. UTC | #1 
Il 27/07/22 06:50, Bo-Chen Chen ha scritto:
> From: Guillaume Ranquet <granquet@baylibre.com>
> 
> This patch adds two helper functions that extract the frequency and word
> length from a struct cea_sad.
> 
> For these helper functions new defines are added that help translate the
> 'freq' and 'byte2' fields into real numbers.
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
> Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Jani Nikula Aug. 2, 2022, 2:11 p.m. UTC | #2 
On Wed, 27 Jul 2022, Bo-Chen Chen <rex-bc.chen@mediatek.com> wrote:
> From: Guillaume Ranquet <granquet@baylibre.com>
>
> This patch adds two helper functions that extract the frequency and word
> length from a struct cea_sad.
>
> For these helper functions new defines are added that help translate the
> 'freq' and 'byte2' fields into real numbers.

I think we should stop adding a plethora of functions that deal with
sads like this.

There should probably be *one* struct that contains all the details you
and everyone need extracted. There should be *one* function that fills
in all the details. The struct should be placed in
connector->display_info, and the function should be called *once* from
update_display_info().

Ideally, the function shouldn't even be exposed from drm_edid.c, but if
you still need to deal with situations where you don't call connector
update, maybe it needs to be exposed.

BR,
Jani.


>
> Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
> Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
> ---
>  drivers/gpu/drm/drm_edid.c | 63 ++++++++++++++++++++++++++++++++++++++
>  include/drm/drm_edid.h     | 14 +++++++++
>  2 files changed, 77 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index bc43e1b32092..2a6f92da5ff3 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -4916,6 +4916,69 @@ int drm_edid_to_speaker_allocation(const struct edid *edid, u8 **sadb)
>  }
>  EXPORT_SYMBOL(drm_edid_to_speaker_allocation);
>  
> +/**
> + * drm_cea_sad_get_sample_rate - Extract the sample rate from cea_sad
> + * @sad: Pointer to the cea_sad struct
> + *
> + * Extracts the cea_sad frequency field and returns the sample rate in Hz.
> + *
> + * Return: Sample rate in Hz or a negative errno if parsing failed.
> + */
> +int drm_cea_sad_get_sample_rate(const struct cea_sad *sad)
> +{
> +	switch (sad->freq) {
> +	case DRM_CEA_SAD_FREQ_32KHZ:
> +		return 32000;
> +	case DRM_CEA_SAD_FREQ_44KHZ:
> +		return 44100;
> +	case DRM_CEA_SAD_FREQ_48KHZ:
> +		return 48000;
> +	case DRM_CEA_SAD_FREQ_88KHZ:
> +		return 88200;
> +	case DRM_CEA_SAD_FREQ_96KHZ:
> +		return 96000;
> +	case DRM_CEA_SAD_FREQ_176KHZ:
> +		return 176400;
> +	case DRM_CEA_SAD_FREQ_192KHZ:
> +		return 192000;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +EXPORT_SYMBOL(drm_cea_sad_get_sample_rate);
> +
> +/**
> + * drm_cea_sad_get_uncompressed_word_length - Extract word length
> + * @sad: Pointer to the cea_sad struct
> + *
> + * Extracts the cea_sad byte2 field and returns the word length for an
> + * uncompressed stream.
> + *
> + * Note: This function may only be called for uncompressed audio.
> + *
> + * Return: Word length in bits or a negative errno if parsing failed.
> + */
> +int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad *sad)
> +{
> +	if (sad->format != HDMI_AUDIO_CODING_TYPE_PCM) {
> +		DRM_WARN("Unable to get the uncompressed word length for format: %u\n",
> +			 sad->format);
> +		return -EINVAL;
> +	}
> +
> +	switch (sad->byte2) {
> +	case DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT:
> +		return 16;
> +	case DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT:
> +		return 20;
> +	case DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT:
> +		return 24;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +EXPORT_SYMBOL(drm_cea_sad_get_uncompressed_word_length);
> +
>  /**
>   * drm_av_sync_delay - compute the HDMI/DP sink audio-video sync delay
>   * @connector: connector associated with the HDMI/DP sink
> diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
> index c2c43a4af681..779b710aed40 100644
> --- a/include/drm/drm_edid.h
> +++ b/include/drm/drm_edid.h
> @@ -373,6 +373,18 @@ struct cea_sad {
>  	u8 byte2;
>  };
>  
> +#define DRM_CEA_SAD_FREQ_32KHZ  BIT(0)
> +#define DRM_CEA_SAD_FREQ_44KHZ  BIT(1)
> +#define DRM_CEA_SAD_FREQ_48KHZ  BIT(2)
> +#define DRM_CEA_SAD_FREQ_88KHZ  BIT(3)
> +#define DRM_CEA_SAD_FREQ_96KHZ  BIT(4)
> +#define DRM_CEA_SAD_FREQ_176KHZ BIT(5)
> +#define DRM_CEA_SAD_FREQ_192KHZ BIT(6)
> +
> +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT BIT(0)
> +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT BIT(1)
> +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT BIT(2)
> +
>  struct drm_encoder;
>  struct drm_connector;
>  struct drm_connector_state;
> @@ -380,6 +392,8 @@ struct drm_display_mode;
>  
>  int drm_edid_to_sad(const struct edid *edid, struct cea_sad **sads);
>  int drm_edid_to_speaker_allocation(const struct edid *edid, u8 **sadb);
> +int drm_cea_sad_get_sample_rate(const struct cea_sad *sad);
> +int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad *sad);
>  int drm_av_sync_delay(struct drm_connector *connector,
>  		      const struct drm_display_mode *mode);
Rex-BC Chen (陳柏辰) Aug. 5, 2022, 6:54 a.m. UTC | #3 
On Tue, 2022-08-02 at 17:11 +0300, Jani Nikula wrote:
> On Wed, 27 Jul 2022, Bo-Chen Chen <rex-bc.chen@mediatek.com> wrote:
> > From: Guillaume Ranquet <granquet@baylibre.com>
> > 
> > This patch adds two helper functions that extract the frequency and
> > word
> > length from a struct cea_sad.
> > 
> > For these helper functions new defines are added that help
> > translate the
> > 'freq' and 'byte2' fields into real numbers.
> 
> I think we should stop adding a plethora of functions that deal with
> sads like this.
> 
> There should probably be *one* struct that contains all the details
> you
> and everyone need extracted. There should be *one* function that
> fills
> in all the details. The struct should be placed in
> connector->display_info, and the function should be called *once*
> from
> update_display_info().
> 
> Ideally, the function shouldn't even be exposed from drm_edid.c, but
> if
> you still need to deal with situations where you don't call connector
> update, maybe it needs to be exposed.
> 
> BR,
> Jani.
> 
> 

Hello Jani,

Thanks for your review.
After checking our patches, we found we will not use these two function
because we remove them in patch [11/11] drm/mediatek: Use cached audio
config when changing resolution.

I will drop [02/11] and [03/11].

Thanks!

BRs,
Bo-Chen

> > 
> > Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
> > Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
> > Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
> > ---
> >  drivers/gpu/drm/drm_edid.c | 63
> > ++++++++++++++++++++++++++++++++++++++
> >  include/drm/drm_edid.h     | 14 +++++++++
> >  2 files changed, 77 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/drm_edid.c
> > b/drivers/gpu/drm/drm_edid.c
> > index bc43e1b32092..2a6f92da5ff3 100644
> > --- a/drivers/gpu/drm/drm_edid.c
> > +++ b/drivers/gpu/drm/drm_edid.c
> > @@ -4916,6 +4916,69 @@ int drm_edid_to_speaker_allocation(const
> > struct edid *edid, u8 **sadb)
> >  }
> >  EXPORT_SYMBOL(drm_edid_to_speaker_allocation);
> >  
> > +/**
> > + * drm_cea_sad_get_sample_rate - Extract the sample rate from
> > cea_sad
> > + * @sad: Pointer to the cea_sad struct
> > + *
> > + * Extracts the cea_sad frequency field and returns the sample
> > rate in Hz.
> > + *
> > + * Return: Sample rate in Hz or a negative errno if parsing
> > failed.
> > + */
> > +int drm_cea_sad_get_sample_rate(const struct cea_sad *sad)
> > +{
> > +	switch (sad->freq) {
> > +	case DRM_CEA_SAD_FREQ_32KHZ:
> > +		return 32000;
> > +	case DRM_CEA_SAD_FREQ_44KHZ:
> > +		return 44100;
> > +	case DRM_CEA_SAD_FREQ_48KHZ:
> > +		return 48000;
> > +	case DRM_CEA_SAD_FREQ_88KHZ:
> > +		return 88200;
> > +	case DRM_CEA_SAD_FREQ_96KHZ:
> > +		return 96000;
> > +	case DRM_CEA_SAD_FREQ_176KHZ:
> > +		return 176400;
> > +	case DRM_CEA_SAD_FREQ_192KHZ:
> > +		return 192000;
> > +	default:
> > +		return -EINVAL;
> > +	}
> > +}
> > +EXPORT_SYMBOL(drm_cea_sad_get_sample_rate);
> > +
> > +/**
> > + * drm_cea_sad_get_uncompressed_word_length - Extract word length
> > + * @sad: Pointer to the cea_sad struct
> > + *
> > + * Extracts the cea_sad byte2 field and returns the word length
> > for an
> > + * uncompressed stream.
> > + *
> > + * Note: This function may only be called for uncompressed audio.
> > + *
> > + * Return: Word length in bits or a negative errno if parsing
> > failed.
> > + */
> > +int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad
> > *sad)
> > +{
> > +	if (sad->format != HDMI_AUDIO_CODING_TYPE_PCM) {
> > +		DRM_WARN("Unable to get the uncompressed word length
> > for format: %u\n",
> > +			 sad->format);
> > +		return -EINVAL;
> > +	}
> > +
> > +	switch (sad->byte2) {
> > +	case DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT:
> > +		return 16;
> > +	case DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT:
> > +		return 20;
> > +	case DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT:
> > +		return 24;
> > +	default:
> > +		return -EINVAL;
> > +	}
> > +}
> > +EXPORT_SYMBOL(drm_cea_sad_get_uncompressed_word_length);
> > +
> >  /**
> >   * drm_av_sync_delay - compute the HDMI/DP sink audio-video sync
> > delay
> >   * @connector: connector associated with the HDMI/DP sink
> > diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
> > index c2c43a4af681..779b710aed40 100644
> > --- a/include/drm/drm_edid.h
> > +++ b/include/drm/drm_edid.h
> > @@ -373,6 +373,18 @@ struct cea_sad {
> >  	u8 byte2;
> >  };
> >  
> > +#define DRM_CEA_SAD_FREQ_32KHZ  BIT(0)
> > +#define DRM_CEA_SAD_FREQ_44KHZ  BIT(1)
> > +#define DRM_CEA_SAD_FREQ_48KHZ  BIT(2)
> > +#define DRM_CEA_SAD_FREQ_88KHZ  BIT(3)
> > +#define DRM_CEA_SAD_FREQ_96KHZ  BIT(4)
> > +#define DRM_CEA_SAD_FREQ_176KHZ BIT(5)
> > +#define DRM_CEA_SAD_FREQ_192KHZ BIT(6)
> > +
> > +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT BIT(0)
> > +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT BIT(1)
> > +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT BIT(2)
> > +
> >  struct drm_encoder;
> >  struct drm_connector;
> >  struct drm_connector_state;
> > @@ -380,6 +392,8 @@ struct drm_display_mode;
> >  
> >  int drm_edid_to_sad(const struct edid *edid, struct cea_sad
> > **sads);
> >  int drm_edid_to_speaker_allocation(const struct edid *edid, u8
> > **sadb);
> > +int drm_cea_sad_get_sample_rate(const struct cea_sad *sad);
> > +int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad
> > *sad);
> >  int drm_av_sync_delay(struct drm_connector *connector,
> >  		      const struct drm_display_mode *mode);
> 
>
Jani Nikula Aug. 5, 2022, 7:54 a.m. UTC | #4 
On Fri, 05 Aug 2022, Rex-BC Chen <rex-bc.chen@mediatek.com> wrote:
> On Tue, 2022-08-02 at 17:11 +0300, Jani Nikula wrote:
>> On Wed, 27 Jul 2022, Bo-Chen Chen <rex-bc.chen@mediatek.com> wrote:
>> > From: Guillaume Ranquet <granquet@baylibre.com>
>> > 
>> > This patch adds two helper functions that extract the frequency and
>> > word
>> > length from a struct cea_sad.
>> > 
>> > For these helper functions new defines are added that help
>> > translate the
>> > 'freq' and 'byte2' fields into real numbers.
>> 
>> I think we should stop adding a plethora of functions that deal with
>> sads like this.
>> 
>> There should probably be *one* struct that contains all the details
>> you
>> and everyone need extracted. There should be *one* function that
>> fills
>> in all the details. The struct should be placed in
>> connector->display_info, and the function should be called *once*
>> from
>> update_display_info().
>> 
>> Ideally, the function shouldn't even be exposed from drm_edid.c, but
>> if
>> you still need to deal with situations where you don't call connector
>> update, maybe it needs to be exposed.
>> 
>> BR,
>> Jani.
>> 
>> 
>
> Hello Jani,
>
> Thanks for your review.
> After checking our patches, we found we will not use these two function
> because we remove them in patch [11/11] drm/mediatek: Use cached audio
> config when changing resolution.
>
> I will drop [02/11] and [03/11].
>
> Thanks!

Thank you too! :)

BR,
Jani.


>
> BRs,
> Bo-Chen
>
>> > 
>> > Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
>> > Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
>> > Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
>> > ---
>> >  drivers/gpu/drm/drm_edid.c | 63
>> > ++++++++++++++++++++++++++++++++++++++
>> >  include/drm/drm_edid.h     | 14 +++++++++
>> >  2 files changed, 77 insertions(+)
>> > 
>> > diff --git a/drivers/gpu/drm/drm_edid.c
>> > b/drivers/gpu/drm/drm_edid.c
>> > index bc43e1b32092..2a6f92da5ff3 100644
>> > --- a/drivers/gpu/drm/drm_edid.c
>> > +++ b/drivers/gpu/drm/drm_edid.c
>> > @@ -4916,6 +4916,69 @@ int drm_edid_to_speaker_allocation(const
>> > struct edid *edid, u8 **sadb)
>> >  }
>> >  EXPORT_SYMBOL(drm_edid_to_speaker_allocation);
>> >  
>> > +/**
>> > + * drm_cea_sad_get_sample_rate - Extract the sample rate from
>> > cea_sad
>> > + * @sad: Pointer to the cea_sad struct
>> > + *
>> > + * Extracts the cea_sad frequency field and returns the sample
>> > rate in Hz.
>> > + *
>> > + * Return: Sample rate in Hz or a negative errno if parsing
>> > failed.
>> > + */
>> > +int drm_cea_sad_get_sample_rate(const struct cea_sad *sad)
>> > +{
>> > +	switch (sad->freq) {
>> > +	case DRM_CEA_SAD_FREQ_32KHZ:
>> > +		return 32000;
>> > +	case DRM_CEA_SAD_FREQ_44KHZ:
>> > +		return 44100;
>> > +	case DRM_CEA_SAD_FREQ_48KHZ:
>> > +		return 48000;
>> > +	case DRM_CEA_SAD_FREQ_88KHZ:
>> > +		return 88200;
>> > +	case DRM_CEA_SAD_FREQ_96KHZ:
>> > +		return 96000;
>> > +	case DRM_CEA_SAD_FREQ_176KHZ:
>> > +		return 176400;
>> > +	case DRM_CEA_SAD_FREQ_192KHZ:
>> > +		return 192000;
>> > +	default:
>> > +		return -EINVAL;
>> > +	}
>> > +}
>> > +EXPORT_SYMBOL(drm_cea_sad_get_sample_rate);
>> > +
>> > +/**
>> > + * drm_cea_sad_get_uncompressed_word_length - Extract word length
>> > + * @sad: Pointer to the cea_sad struct
>> > + *
>> > + * Extracts the cea_sad byte2 field and returns the word length
>> > for an
>> > + * uncompressed stream.
>> > + *
>> > + * Note: This function may only be called for uncompressed audio.
>> > + *
>> > + * Return: Word length in bits or a negative errno if parsing
>> > failed.
>> > + */
>> > +int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad
>> > *sad)
>> > +{
>> > +	if (sad->format != HDMI_AUDIO_CODING_TYPE_PCM) {
>> > +		DRM_WARN("Unable to get the uncompressed word length
>> > for format: %u\n",
>> > +			 sad->format);
>> > +		return -EINVAL;
>> > +	}
>> > +
>> > +	switch (sad->byte2) {
>> > +	case DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT:
>> > +		return 16;
>> > +	case DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT:
>> > +		return 20;
>> > +	case DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT:
>> > +		return 24;
>> > +	default:
>> > +		return -EINVAL;
>> > +	}
>> > +}
>> > +EXPORT_SYMBOL(drm_cea_sad_get_uncompressed_word_length);
>> > +
>> >  /**
>> >   * drm_av_sync_delay - compute the HDMI/DP sink audio-video sync
>> > delay
>> >   * @connector: connector associated with the HDMI/DP sink
>> > diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
>> > index c2c43a4af681..779b710aed40 100644
>> > --- a/include/drm/drm_edid.h
>> > +++ b/include/drm/drm_edid.h
>> > @@ -373,6 +373,18 @@ struct cea_sad {
>> >  	u8 byte2;
>> >  };
>> >  
>> > +#define DRM_CEA_SAD_FREQ_32KHZ  BIT(0)
>> > +#define DRM_CEA_SAD_FREQ_44KHZ  BIT(1)
>> > +#define DRM_CEA_SAD_FREQ_48KHZ  BIT(2)
>> > +#define DRM_CEA_SAD_FREQ_88KHZ  BIT(3)
>> > +#define DRM_CEA_SAD_FREQ_96KHZ  BIT(4)
>> > +#define DRM_CEA_SAD_FREQ_176KHZ BIT(5)
>> > +#define DRM_CEA_SAD_FREQ_192KHZ BIT(6)
>> > +
>> > +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT BIT(0)
>> > +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT BIT(1)
>> > +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT BIT(2)
>> > +
>> >  struct drm_encoder;
>> >  struct drm_connector;
>> >  struct drm_connector_state;
>> > @@ -380,6 +392,8 @@ struct drm_display_mode;
>> >  
>> >  int drm_edid_to_sad(const struct edid *edid, struct cea_sad
>> > **sads);
>> >  int drm_edid_to_speaker_allocation(const struct edid *edid, u8
>> > **sadb);
>> > +int drm_cea_sad_get_sample_rate(const struct cea_sad *sad);
>> > +int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad
>> > *sad);
>> >  int drm_av_sync_delay(struct drm_connector *connector,
>> >  		      const struct drm_display_mode *mode);
>> 
>> 
>
diff mbox series

Patch

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index bc43e1b32092..2a6f92da5ff3 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4916,6 +4916,69 @@  int drm_edid_to_speaker_allocation(const struct edid *edid, u8 **sadb)
 }
 EXPORT_SYMBOL(drm_edid_to_speaker_allocation);
 
+/**
+ * drm_cea_sad_get_sample_rate - Extract the sample rate from cea_sad
+ * @sad: Pointer to the cea_sad struct
+ *
+ * Extracts the cea_sad frequency field and returns the sample rate in Hz.
+ *
+ * Return: Sample rate in Hz or a negative errno if parsing failed.
+ */
+int drm_cea_sad_get_sample_rate(const struct cea_sad *sad)
+{
+	switch (sad->freq) {
+	case DRM_CEA_SAD_FREQ_32KHZ:
+		return 32000;
+	case DRM_CEA_SAD_FREQ_44KHZ:
+		return 44100;
+	case DRM_CEA_SAD_FREQ_48KHZ:
+		return 48000;
+	case DRM_CEA_SAD_FREQ_88KHZ:
+		return 88200;
+	case DRM_CEA_SAD_FREQ_96KHZ:
+		return 96000;
+	case DRM_CEA_SAD_FREQ_176KHZ:
+		return 176400;
+	case DRM_CEA_SAD_FREQ_192KHZ:
+		return 192000;
+	default:
+		return -EINVAL;
+	}
+}
+EXPORT_SYMBOL(drm_cea_sad_get_sample_rate);
+
+/**
+ * drm_cea_sad_get_uncompressed_word_length - Extract word length
+ * @sad: Pointer to the cea_sad struct
+ *
+ * Extracts the cea_sad byte2 field and returns the word length for an
+ * uncompressed stream.
+ *
+ * Note: This function may only be called for uncompressed audio.
+ *
+ * Return: Word length in bits or a negative errno if parsing failed.
+ */
+int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad *sad)
+{
+	if (sad->format != HDMI_AUDIO_CODING_TYPE_PCM) {
+		DRM_WARN("Unable to get the uncompressed word length for format: %u\n",
+			 sad->format);
+		return -EINVAL;
+	}
+
+	switch (sad->byte2) {
+	case DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT:
+		return 16;
+	case DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT:
+		return 20;
+	case DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT:
+		return 24;
+	default:
+		return -EINVAL;
+	}
+}
+EXPORT_SYMBOL(drm_cea_sad_get_uncompressed_word_length);
+
 /**
  * drm_av_sync_delay - compute the HDMI/DP sink audio-video sync delay
  * @connector: connector associated with the HDMI/DP sink
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index c2c43a4af681..779b710aed40 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -373,6 +373,18 @@  struct cea_sad {
 	u8 byte2;
 };
 
+#define DRM_CEA_SAD_FREQ_32KHZ  BIT(0)
+#define DRM_CEA_SAD_FREQ_44KHZ  BIT(1)
+#define DRM_CEA_SAD_FREQ_48KHZ  BIT(2)
+#define DRM_CEA_SAD_FREQ_88KHZ  BIT(3)
+#define DRM_CEA_SAD_FREQ_96KHZ  BIT(4)
+#define DRM_CEA_SAD_FREQ_176KHZ BIT(5)
+#define DRM_CEA_SAD_FREQ_192KHZ BIT(6)
+
+#define DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT BIT(0)
+#define DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT BIT(1)
+#define DRM_CEA_SAD_UNCOMPRESSED_WORD_24BIT BIT(2)
+
 struct drm_encoder;
 struct drm_connector;
 struct drm_connector_state;
@@ -380,6 +392,8 @@  struct drm_display_mode;
 
 int drm_edid_to_sad(const struct edid *edid, struct cea_sad **sads);
 int drm_edid_to_speaker_allocation(const struct edid *edid, u8 **sadb);
+int drm_cea_sad_get_sample_rate(const struct cea_sad *sad);
+int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad *sad);
 int drm_av_sync_delay(struct drm_connector *connector,
 		      const struct drm_display_mode *mode);