[v2,12/43] drm/fourcc: Add format helpers for checking YUV sub-sampling
diff mbox series

Message ID 20181123092515.2511-13-paul.kocialkowski@bootlin.com
State New
Headers show
Series
  • drm/sun4i: Support for linear and tiled YUV formats with the frontend
Related show

Commit Message

Paul Kocialkowski Nov. 23, 2018, 9:24 a.m. UTC
This introduces new format helpers that use the previously-introduced
format info helpers for checking YUV sub-sampling.

Only the format fourcc is required by these helpers and the formats are
iterated from the list.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
---
 drivers/gpu/drm/drm_fourcc.c | 105 +++++++++++++++++++++++++++++++++++
 include/drm/drm_fourcc.h     |   5 ++
 2 files changed, 110 insertions(+)

Comments

Ayan Halder Nov. 23, 2018, 4:55 p.m. UTC | #1
On Fri, Nov 23, 2018 at 10:24:44AM +0100, Paul Kocialkowski wrote:

Hi Paul,

> This introduces new format helpers that use the previously-introduced
> format info helpers for checking YUV sub-sampling.
> 
> Only the format fourcc is required by these helpers and the formats are
> iterated from the list.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> ---
>  drivers/gpu/drm/drm_fourcc.c | 105 +++++++++++++++++++++++++++++++++++
>  include/drm/drm_fourcc.h     |   5 ++
>  2 files changed, 110 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index b56e773f9f63..6d395c586ad5 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -492,6 +492,111 @@ bool drm_format_is_yuv_planar(uint32_t format)
>  }
>  EXPORT_SYMBOL(drm_format_is_yuv_planar);
>  
> +/**
> + * drm_format_is_yuv_sampling_410 - check that the format is a YUV format with
> + * 4:1:0 sub-sampling
> + * @format: pixel format
> + *
> + * Returns:
> + * A boolean indicating whether the format is a YUV format with 4:1:0
> + * sub-sampling.
> + */
> +bool drm_format_is_yuv_sampling_410(uint32_t format)
> +{
> +	const struct drm_format_info *info;
> +
> +	info = drm_format_info(format);
> +	if (!info)
> +		return false;
> +
> +	return drm_format_info_is_yuv_sampling_410(info);
> +}
> +EXPORT_SYMBOL(drm_format_is_yuv_sampling_410);
> +
> +/**
> + * drm_format_is_yuv_sampling_411 - check that the format is a YUV format with
> + * 4:1:1 sub-sampling
> + * @format: pixel format
> + *
> + * Returns:
> + * A boolean indicating whether the format is a YUV format with 4:1:1
> + * sub-sampling.
> + */
> +bool drm_format_is_yuv_sampling_411(uint32_t format)
> +{
> +	const struct drm_format_info *info;
> +
> +	info = drm_format_info(format);
> +	if (!info)
> +		return false;
> +
> +	return drm_format_info_is_yuv_sampling_411(info);
> +}
> +EXPORT_SYMBOL(drm_format_is_yuv_sampling_411);
> +
> +/**
> + * drm_format_is_yuv_sampling_420 - check that the format is a YUV format with
> + * 4:2:0 sub-sampling
> + * @format: pixel format
> + *
> + * Returns:
> + * A boolean indicating whether the format is a YUV format with 4:2:0
> + * sub-sampling.
> + */
> +bool drm_format_is_yuv_sampling_420(uint32_t format)
> +{
> +	const struct drm_format_info *info;
> +
> +	info = drm_format_info(format);
> +	if (!info)
> +		return false;
> +
> +	return drm_format_info_is_yuv_sampling_420(info);
> +}
> +EXPORT_SYMBOL(drm_format_is_yuv_sampling_420);
> +
> +/**
> + * drm_format_is_yuv_sampling_422 - check that the format is a YUV format with
> + * 4:2:2 sub-sampling
> + * @format: pixel format
> + *
> + * Returns:
> + * A boolean indicating whether the format is a YUV format with 4:2:2
> + * sub-sampling.
> + */
> +bool drm_format_is_yuv_sampling_422(uint32_t format)
> +{
> +	const struct drm_format_info *info;
> +
> +	info = drm_format_info(format);
> +	if (!info)
> +		return false;
> +
> +	return drm_format_info_is_yuv_sampling_422(info);
> +}
> +EXPORT_SYMBOL(drm_format_is_yuv_sampling_422);
> +
> +/**
> + * drm_format_is_yuv_sampling_444 - check that the format is a YUV format with
> + * 4:4:4 sub-sampling
> + * @format: pixel format
> + *
> + * Returns:
> + * A boolean indicating whether the format is a YUV format with 4:4:4
> + * sub-sampling.
> + */
> +bool drm_format_is_yuv_sampling_444(uint32_t format)
> +{
> +	const struct drm_format_info *info;
> +
> +	info = drm_format_info(format);
> +	if (!info)
> +		return false;
> +
> +	return drm_format_info_is_yuv_sampling_444(info);
> +}
> +EXPORT_SYMBOL(drm_format_is_yuv_sampling_444);
> +
>  /**
>   * drm_format_info_block_width - width in pixels of block.
>   * @info: pixel format info
> diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
> index d170b7b323f7..cf082d8b6ad4 100644
> --- a/include/drm/drm_fourcc.h
> +++ b/include/drm/drm_fourcc.h
> @@ -278,6 +278,11 @@ bool drm_format_is_yuv(uint32_t format);
>  bool drm_format_is_yuv_packed(uint32_t format);
>  bool drm_format_is_yuv_semiplanar(uint32_t format);
>  bool drm_format_is_yuv_planar(uint32_t format);
> +bool drm_format_is_yuv_sampling_410(uint32_t format);
> +bool drm_format_is_yuv_sampling_411(uint32_t format);
> +bool drm_format_is_yuv_sampling_420(uint32_t format);
> +bool drm_format_is_yuv_sampling_422(uint32_t format);
> +bool drm_format_is_yuv_sampling_444(uint32_t format);
>  unsigned int drm_format_info_block_width(const struct drm_format_info *info,
>  					 int plane);
>  unsigned int drm_format_info_block_height(const struct drm_format_info *info,
> -- 
> 2.19.1
> 
From patches [PATCH v2 08/43] till [PATCH v2 12/43], looks good to me.

How about clubbing all the drm_format_helper functions together in a
separate file (call it drm_fourcc_helper.c)? This way, we could
keep the __drm_format_info[] only drm_fourcc.c.

> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
Ville Syrjälä Nov. 23, 2018, 5:23 p.m. UTC | #2
On Fri, Nov 23, 2018 at 04:55:33PM +0000, Ayan Halder wrote:
> On Fri, Nov 23, 2018 at 10:24:44AM +0100, Paul Kocialkowski wrote:
> 
> Hi Paul,
> 
> > This introduces new format helpers that use the previously-introduced
> > format info helpers for checking YUV sub-sampling.
> > 
> > Only the format fourcc is required by these helpers and the formats are
> > iterated from the list.
> > 
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > ---
> >  drivers/gpu/drm/drm_fourcc.c | 105 +++++++++++++++++++++++++++++++++++
> >  include/drm/drm_fourcc.h     |   5 ++
> >  2 files changed, 110 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> > index b56e773f9f63..6d395c586ad5 100644
> > --- a/drivers/gpu/drm/drm_fourcc.c
> > +++ b/drivers/gpu/drm/drm_fourcc.c
> > @@ -492,6 +492,111 @@ bool drm_format_is_yuv_planar(uint32_t format)
> >  }
> >  EXPORT_SYMBOL(drm_format_is_yuv_planar);
> >  
> > +/**
> > + * drm_format_is_yuv_sampling_410 - check that the format is a YUV format with
> > + * 4:1:0 sub-sampling
> > + * @format: pixel format
> > + *
> > + * Returns:
> > + * A boolean indicating whether the format is a YUV format with 4:1:0
> > + * sub-sampling.
> > + */
> > +bool drm_format_is_yuv_sampling_410(uint32_t format)
> > +{
> > +	const struct drm_format_info *info;
> > +
> > +	info = drm_format_info(format);
> > +	if (!info)
> > +		return false;

Looks like you're doing a lot of drm_format_info(fb->format->format),
which doesn't make sense. Not to mention that each lookup is a linear
search so the costs may start to add up.

Unless there's a really good reason I'd rather we try to remove all
the current helpers that do these lookups, and not add any more.

> > +
> > +	return drm_format_info_is_yuv_sampling_410(info);
> > +}
> > +EXPORT_SYMBOL(drm_format_is_yuv_sampling_410);
> > +
> > +/**
> > + * drm_format_is_yuv_sampling_411 - check that the format is a YUV format with
> > + * 4:1:1 sub-sampling
> > + * @format: pixel format
> > + *
> > + * Returns:
> > + * A boolean indicating whether the format is a YUV format with 4:1:1
> > + * sub-sampling.
> > + */
> > +bool drm_format_is_yuv_sampling_411(uint32_t format)
> > +{
> > +	const struct drm_format_info *info;
> > +
> > +	info = drm_format_info(format);
> > +	if (!info)
> > +		return false;
> > +
> > +	return drm_format_info_is_yuv_sampling_411(info);
> > +}
> > +EXPORT_SYMBOL(drm_format_is_yuv_sampling_411);
> > +
> > +/**
> > + * drm_format_is_yuv_sampling_420 - check that the format is a YUV format with
> > + * 4:2:0 sub-sampling
> > + * @format: pixel format
> > + *
> > + * Returns:
> > + * A boolean indicating whether the format is a YUV format with 4:2:0
> > + * sub-sampling.
> > + */
> > +bool drm_format_is_yuv_sampling_420(uint32_t format)
> > +{
> > +	const struct drm_format_info *info;
> > +
> > +	info = drm_format_info(format);
> > +	if (!info)
> > +		return false;
> > +
> > +	return drm_format_info_is_yuv_sampling_420(info);
> > +}
> > +EXPORT_SYMBOL(drm_format_is_yuv_sampling_420);
> > +
> > +/**
> > + * drm_format_is_yuv_sampling_422 - check that the format is a YUV format with
> > + * 4:2:2 sub-sampling
> > + * @format: pixel format
> > + *
> > + * Returns:
> > + * A boolean indicating whether the format is a YUV format with 4:2:2
> > + * sub-sampling.
> > + */
> > +bool drm_format_is_yuv_sampling_422(uint32_t format)
> > +{
> > +	const struct drm_format_info *info;
> > +
> > +	info = drm_format_info(format);
> > +	if (!info)
> > +		return false;
> > +
> > +	return drm_format_info_is_yuv_sampling_422(info);
> > +}
> > +EXPORT_SYMBOL(drm_format_is_yuv_sampling_422);
> > +
> > +/**
> > + * drm_format_is_yuv_sampling_444 - check that the format is a YUV format with
> > + * 4:4:4 sub-sampling
> > + * @format: pixel format
> > + *
> > + * Returns:
> > + * A boolean indicating whether the format is a YUV format with 4:4:4
> > + * sub-sampling.
> > + */
> > +bool drm_format_is_yuv_sampling_444(uint32_t format)
> > +{
> > +	const struct drm_format_info *info;
> > +
> > +	info = drm_format_info(format);
> > +	if (!info)
> > +		return false;
> > +
> > +	return drm_format_info_is_yuv_sampling_444(info);
> > +}
> > +EXPORT_SYMBOL(drm_format_is_yuv_sampling_444);
> > +
> >  /**
> >   * drm_format_info_block_width - width in pixels of block.
> >   * @info: pixel format info
> > diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
> > index d170b7b323f7..cf082d8b6ad4 100644
> > --- a/include/drm/drm_fourcc.h
> > +++ b/include/drm/drm_fourcc.h
> > @@ -278,6 +278,11 @@ bool drm_format_is_yuv(uint32_t format);
> >  bool drm_format_is_yuv_packed(uint32_t format);
> >  bool drm_format_is_yuv_semiplanar(uint32_t format);
> >  bool drm_format_is_yuv_planar(uint32_t format);
> > +bool drm_format_is_yuv_sampling_410(uint32_t format);
> > +bool drm_format_is_yuv_sampling_411(uint32_t format);
> > +bool drm_format_is_yuv_sampling_420(uint32_t format);
> > +bool drm_format_is_yuv_sampling_422(uint32_t format);
> > +bool drm_format_is_yuv_sampling_444(uint32_t format);
> >  unsigned int drm_format_info_block_width(const struct drm_format_info *info,
> >  					 int plane);
> >  unsigned int drm_format_info_block_height(const struct drm_format_info *info,
> > -- 
> > 2.19.1
> > 
> From patches [PATCH v2 08/43] till [PATCH v2 12/43], looks good to me.
> 
> How about clubbing all the drm_format_helper functions together in a
> separate file (call it drm_fourcc_helper.c)? This way, we could
> keep the __drm_format_info[] only drm_fourcc.c.
> 
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
Paul Kocialkowski Nov. 26, 2018, 9:03 a.m. UTC | #3
Hi,

On Fri, 2018-11-23 at 19:23 +0200, Ville Syrjälä wrote:
> On Fri, Nov 23, 2018 at 04:55:33PM +0000, Ayan Halder wrote:
> > On Fri, Nov 23, 2018 at 10:24:44AM +0100, Paul Kocialkowski wrote:
> > 
> > Hi Paul,
> > 
> > > This introduces new format helpers that use the previously-introduced
> > > format info helpers for checking YUV sub-sampling.
> > > 
> > > Only the format fourcc is required by these helpers and the formats are
> > > iterated from the list.
> > > 
> > > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > > ---
> > >  drivers/gpu/drm/drm_fourcc.c | 105 +++++++++++++++++++++++++++++++++++
> > >  include/drm/drm_fourcc.h     |   5 ++
> > >  2 files changed, 110 insertions(+)
> > > 
> > > diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> > > index b56e773f9f63..6d395c586ad5 100644
> > > --- a/drivers/gpu/drm/drm_fourcc.c
> > > +++ b/drivers/gpu/drm/drm_fourcc.c
> > > @@ -492,6 +492,111 @@ bool drm_format_is_yuv_planar(uint32_t format)
> > >  }
> > >  EXPORT_SYMBOL(drm_format_is_yuv_planar);
> > >  
> > > +/**
> > > + * drm_format_is_yuv_sampling_410 - check that the format is a YUV format with
> > > + * 4:1:0 sub-sampling
> > > + * @format: pixel format
> > > + *
> > > + * Returns:
> > > + * A boolean indicating whether the format is a YUV format with 4:1:0
> > > + * sub-sampling.
> > > + */
> > > +bool drm_format_is_yuv_sampling_410(uint32_t format)
> > > +{
> > > +	const struct drm_format_info *info;
> > > +
> > > +	info = drm_format_info(format);
> > > +	if (!info)
> > > +		return false;
> 
> Looks like you're doing a lot of drm_format_info(fb->format->format),
> which doesn't make sense. Not to mention that each lookup is a linear
> search so the costs may start to add up.
> 
> Unless there's a really good reason I'd rather we try to remove all
> the current helpers that do these lookups, and not add any more.

I totally agree that we should be passing the drm_format_info structure
onwards to all the driver helpers so we don't have to do the lookup each
time.

I thought it was still somewhat acceptable to have lookup fashions of
these format helpers, but I am totally in favor of getting rid of them
(and other lookup helpers eventually).

I'll remove the lookup YUV format helpers and convert this series to
passing the full drm_format_info everywhere needed.

Cheers,

Paul

> > > +
> > > +	return drm_format_info_is_yuv_sampling_410(info);
> > > +}
> > > +EXPORT_SYMBOL(drm_format_is_yuv_sampling_410);
> > > +
> > > +/**
> > > + * drm_format_is_yuv_sampling_411 - check that the format is a YUV format with
> > > + * 4:1:1 sub-sampling
> > > + * @format: pixel format
> > > + *
> > > + * Returns:
> > > + * A boolean indicating whether the format is a YUV format with 4:1:1
> > > + * sub-sampling.
> > > + */
> > > +bool drm_format_is_yuv_sampling_411(uint32_t format)
> > > +{
> > > +	const struct drm_format_info *info;
> > > +
> > > +	info = drm_format_info(format);
> > > +	if (!info)
> > > +		return false;
> > > +
> > > +	return drm_format_info_is_yuv_sampling_411(info);
> > > +}
> > > +EXPORT_SYMBOL(drm_format_is_yuv_sampling_411);
> > > +
> > > +/**
> > > + * drm_format_is_yuv_sampling_420 - check that the format is a YUV format with
> > > + * 4:2:0 sub-sampling
> > > + * @format: pixel format
> > > + *
> > > + * Returns:
> > > + * A boolean indicating whether the format is a YUV format with 4:2:0
> > > + * sub-sampling.
> > > + */
> > > +bool drm_format_is_yuv_sampling_420(uint32_t format)
> > > +{
> > > +	const struct drm_format_info *info;
> > > +
> > > +	info = drm_format_info(format);
> > > +	if (!info)
> > > +		return false;
> > > +
> > > +	return drm_format_info_is_yuv_sampling_420(info);
> > > +}
> > > +EXPORT_SYMBOL(drm_format_is_yuv_sampling_420);
> > > +
> > > +/**
> > > + * drm_format_is_yuv_sampling_422 - check that the format is a YUV format with
> > > + * 4:2:2 sub-sampling
> > > + * @format: pixel format
> > > + *
> > > + * Returns:
> > > + * A boolean indicating whether the format is a YUV format with 4:2:2
> > > + * sub-sampling.
> > > + */
> > > +bool drm_format_is_yuv_sampling_422(uint32_t format)
> > > +{
> > > +	const struct drm_format_info *info;
> > > +
> > > +	info = drm_format_info(format);
> > > +	if (!info)
> > > +		return false;
> > > +
> > > +	return drm_format_info_is_yuv_sampling_422(info);
> > > +}
> > > +EXPORT_SYMBOL(drm_format_is_yuv_sampling_422);
> > > +
> > > +/**
> > > + * drm_format_is_yuv_sampling_444 - check that the format is a YUV format with
> > > + * 4:4:4 sub-sampling
> > > + * @format: pixel format
> > > + *
> > > + * Returns:
> > > + * A boolean indicating whether the format is a YUV format with 4:4:4
> > > + * sub-sampling.
> > > + */
> > > +bool drm_format_is_yuv_sampling_444(uint32_t format)
> > > +{
> > > +	const struct drm_format_info *info;
> > > +
> > > +	info = drm_format_info(format);
> > > +	if (!info)
> > > +		return false;
> > > +
> > > +	return drm_format_info_is_yuv_sampling_444(info);
> > > +}
> > > +EXPORT_SYMBOL(drm_format_is_yuv_sampling_444);
> > > +
> > >  /**
> > >   * drm_format_info_block_width - width in pixels of block.
> > >   * @info: pixel format info
> > > diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
> > > index d170b7b323f7..cf082d8b6ad4 100644
> > > --- a/include/drm/drm_fourcc.h
> > > +++ b/include/drm/drm_fourcc.h
> > > @@ -278,6 +278,11 @@ bool drm_format_is_yuv(uint32_t format);
> > >  bool drm_format_is_yuv_packed(uint32_t format);
> > >  bool drm_format_is_yuv_semiplanar(uint32_t format);
> > >  bool drm_format_is_yuv_planar(uint32_t format);
> > > +bool drm_format_is_yuv_sampling_410(uint32_t format);
> > > +bool drm_format_is_yuv_sampling_411(uint32_t format);
> > > +bool drm_format_is_yuv_sampling_420(uint32_t format);
> > > +bool drm_format_is_yuv_sampling_422(uint32_t format);
> > > +bool drm_format_is_yuv_sampling_444(uint32_t format);
> > >  unsigned int drm_format_info_block_width(const struct drm_format_info *info,
> > >  					 int plane);
> > >  unsigned int drm_format_info_block_height(const struct drm_format_info *info,
> > > -- 
> > > 2.19.1
> > > 
> > From patches [PATCH v2 08/43] till [PATCH v2 12/43], looks good to me.
> > 
> > How about clubbing all the drm_format_helper functions together in a
> > separate file (call it drm_fourcc_helper.c)? This way, we could
> > keep the __drm_format_info[] only drm_fourcc.c.
> > 
> > > _______________________________________________
> > > dri-devel mailing list
> > > dri-devel@lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel

Patch
diff mbox series

diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
index b56e773f9f63..6d395c586ad5 100644
--- a/drivers/gpu/drm/drm_fourcc.c
+++ b/drivers/gpu/drm/drm_fourcc.c
@@ -492,6 +492,111 @@  bool drm_format_is_yuv_planar(uint32_t format)
 }
 EXPORT_SYMBOL(drm_format_is_yuv_planar);
 
+/**
+ * drm_format_is_yuv_sampling_410 - check that the format is a YUV format with
+ * 4:1:0 sub-sampling
+ * @format: pixel format
+ *
+ * Returns:
+ * A boolean indicating whether the format is a YUV format with 4:1:0
+ * sub-sampling.
+ */
+bool drm_format_is_yuv_sampling_410(uint32_t format)
+{
+	const struct drm_format_info *info;
+
+	info = drm_format_info(format);
+	if (!info)
+		return false;
+
+	return drm_format_info_is_yuv_sampling_410(info);
+}
+EXPORT_SYMBOL(drm_format_is_yuv_sampling_410);
+
+/**
+ * drm_format_is_yuv_sampling_411 - check that the format is a YUV format with
+ * 4:1:1 sub-sampling
+ * @format: pixel format
+ *
+ * Returns:
+ * A boolean indicating whether the format is a YUV format with 4:1:1
+ * sub-sampling.
+ */
+bool drm_format_is_yuv_sampling_411(uint32_t format)
+{
+	const struct drm_format_info *info;
+
+	info = drm_format_info(format);
+	if (!info)
+		return false;
+
+	return drm_format_info_is_yuv_sampling_411(info);
+}
+EXPORT_SYMBOL(drm_format_is_yuv_sampling_411);
+
+/**
+ * drm_format_is_yuv_sampling_420 - check that the format is a YUV format with
+ * 4:2:0 sub-sampling
+ * @format: pixel format
+ *
+ * Returns:
+ * A boolean indicating whether the format is a YUV format with 4:2:0
+ * sub-sampling.
+ */
+bool drm_format_is_yuv_sampling_420(uint32_t format)
+{
+	const struct drm_format_info *info;
+
+	info = drm_format_info(format);
+	if (!info)
+		return false;
+
+	return drm_format_info_is_yuv_sampling_420(info);
+}
+EXPORT_SYMBOL(drm_format_is_yuv_sampling_420);
+
+/**
+ * drm_format_is_yuv_sampling_422 - check that the format is a YUV format with
+ * 4:2:2 sub-sampling
+ * @format: pixel format
+ *
+ * Returns:
+ * A boolean indicating whether the format is a YUV format with 4:2:2
+ * sub-sampling.
+ */
+bool drm_format_is_yuv_sampling_422(uint32_t format)
+{
+	const struct drm_format_info *info;
+
+	info = drm_format_info(format);
+	if (!info)
+		return false;
+
+	return drm_format_info_is_yuv_sampling_422(info);
+}
+EXPORT_SYMBOL(drm_format_is_yuv_sampling_422);
+
+/**
+ * drm_format_is_yuv_sampling_444 - check that the format is a YUV format with
+ * 4:4:4 sub-sampling
+ * @format: pixel format
+ *
+ * Returns:
+ * A boolean indicating whether the format is a YUV format with 4:4:4
+ * sub-sampling.
+ */
+bool drm_format_is_yuv_sampling_444(uint32_t format)
+{
+	const struct drm_format_info *info;
+
+	info = drm_format_info(format);
+	if (!info)
+		return false;
+
+	return drm_format_info_is_yuv_sampling_444(info);
+}
+EXPORT_SYMBOL(drm_format_is_yuv_sampling_444);
+
 /**
  * drm_format_info_block_width - width in pixels of block.
  * @info: pixel format info
diff --git a/include/drm/drm_fourcc.h b/include/drm/drm_fourcc.h
index d170b7b323f7..cf082d8b6ad4 100644
--- a/include/drm/drm_fourcc.h
+++ b/include/drm/drm_fourcc.h
@@ -278,6 +278,11 @@  bool drm_format_is_yuv(uint32_t format);
 bool drm_format_is_yuv_packed(uint32_t format);
 bool drm_format_is_yuv_semiplanar(uint32_t format);
 bool drm_format_is_yuv_planar(uint32_t format);
+bool drm_format_is_yuv_sampling_410(uint32_t format);
+bool drm_format_is_yuv_sampling_411(uint32_t format);
+bool drm_format_is_yuv_sampling_420(uint32_t format);
+bool drm_format_is_yuv_sampling_422(uint32_t format);
+bool drm_format_is_yuv_sampling_444(uint32_t format);
 unsigned int drm_format_info_block_width(const struct drm_format_info *info,
 					 int plane);
 unsigned int drm_format_info_block_height(const struct drm_format_info *info,