Re: [PATCH 06/18] video/hdmi: Handle the MPEG Source infoframe
On Fri, Sep 21, 2018 at 10:28:09AM +0200, Hans Verkuil wrote:
> On 09/20/18 20:51, Ville Syrjala wrote:
> > From: Ville Syrjälä
> >
> > Add the code to deal with the MPEG source infoframe.
> >
> > Blindly typed from the spec, and totally untested.
>
> I'm not sure this patch should be added at all. The CTA-861-G spec (section
> 6.7)
> says that the implementation of this infoframe is not recommended due to
> unresolved
> issues.
>
> I don't think I've ever seen it either.
>
> It obviously doesn't hurt to have this code, but I prefer to wait until there
> are devices that actively set/use this infoframe.
Sure. I'm totally fine with leaving it out. Just figured I'd send it out
in case anyone has some use for it.
>
> Regards,
>
> Hans
>
> >
> > Cc: Thierry Reding
> > Cc: Hans Verkuil
> > Cc: linux-me...@vger.kernel.org
> > Signed-off-by: Ville Syrjälä
> > ---
> > drivers/video/hdmi.c | 229
> > +++
> > include/linux/hdmi.h | 27 ++
> > 2 files changed, 256 insertions(+)
> >
> > diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
> > index 9507f668a569..3d24c7746c51 100644
> > --- a/drivers/video/hdmi.c
> > +++ b/drivers/video/hdmi.c
> > @@ -706,6 +706,131 @@ hdmi_vendor_any_infoframe_pack(union
> > hdmi_vendor_any_infoframe *frame,
> > return hdmi_vendor_any_infoframe_pack_only(frame, buffer, size);
> > }
> >
> > +/**
> > + * hdmi_mpeg_source_infoframe_init() - initialize an HDMI MPEG Source
> > infoframe
> > + * @frame: HDMI MPEG Source infoframe
> > + *
> > + * Returns 0 on success or a negative error code on failure.
> > + */
> > +int hdmi_mpeg_source_infoframe_init(struct hdmi_mpeg_source_infoframe
> > *frame)
> > +{
> > + memset(frame, 0, sizeof(*frame));
> > +
> > + frame->type = HDMI_INFOFRAME_TYPE_MPEG_SOURCE;
> > + frame->version = 1;
> > + frame->length = HDMI_MPEG_SOURCE_INFOFRAME_SIZE;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(hdmi_mpeg_source_infoframe_init);
> > +
> > +static int hdmi_mpeg_source_infoframe_check_only(const struct
> > hdmi_mpeg_source_infoframe *frame)
> > +{
> > + if (frame->type != HDMI_INFOFRAME_TYPE_MPEG_SOURCE ||
> > + frame->version != 1 ||
> > + frame->length != HDMI_MPEG_SOURCE_INFOFRAME_SIZE)
> > + return -EINVAL;
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * hdmi_mpeg_source_infoframe_check() - Check and check a HDMI MPEG Source
> > infoframe
> > + * @frame: HDMI MPEG Source infoframe
> > + *
> > + * Validates that the infoframe is consistent and updates derived fields
> > + * (eg. length) based on other fields.
> > + *
> > + * Returns 0 on success or a negative error code on failure.
> > + */
> > +int hdmi_mpeg_source_infoframe_check(struct hdmi_mpeg_source_infoframe
> > *frame)
> > +{
> > + return hdmi_mpeg_source_infoframe_check_only(frame);
> > +}
> > +EXPORT_SYMBOL(hdmi_mpeg_source_infoframe_check);
> > +
> > +/**
> > + * hdmi_mpeg_source_infoframe_pack_only() - write HDMI MPEG Source
> > infoframe to binary buffer
> > + * @frame: HDMI MPEG Source infoframe
> > + * @buffer: destination buffer
> > + * @size: size of buffer
> > + *
> > + * Packs the information contained in the @frame structure into a binary
> > + * representation that can be written into the corresponding controller
> > + * registers. Also computes the checksum as required by section 5.3.5 of
> > + * the HDMI 1.4 specification.
> > + *
> > + * Returns the number of bytes packed into the binary buffer or a negative
> > + * error code on failure.
> > + */
> > +ssize_t hdmi_mpeg_source_infoframe_pack_only(const struct
> > hdmi_mpeg_source_infoframe *frame,
> > +void *buffer, size_t size)
> > +{
> > + u8 *ptr = buffer;
> > + size_t length;
> > + int ret;
> > +
> > + ret = hdmi_mpeg_source_infoframe_check_only(frame);
> > + if (ret)
> > + return ret;
> > +
> > + length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
> > +
> > + if (size < length)
> > + return -ENOSPC;
> > +
> > + memset(buffer, 0, size);
> > +
> > + ptr[0] = frame->type;
> > + ptr[1] = frame->version;
> > + ptr[2] = frame->length;
> > + ptr[3] = 0; /* checksum */
> > +
> > + /* start infoframe payload */
> > + ptr += HDMI_INFOFRAME_HEADER_SIZE;
> > +
> > + ptr[0] = frame->mpeg_bit_rate >> 0;
> > + ptr[1] = frame->mpeg_bit_rate >> 8;
> > + ptr[2] = frame->mpeg_bit_rate >> 16;
> > + ptr[3] = frame->mpeg_bit_rate >> 24;
> > + ptr[4] = (frame->field_repeat << 4) | frame->mpeg_frame;
> > +
> > + hdmi_infoframe_set_checksum(buffer, length);
> > +
> > + return length;
> > +}
> > +EXPORT_SYMBOL(hdmi_mpeg_source_infoframe_pack_only);
> > +
> > +/**
> > + * hdmi_mpeg_source_infoframe_pack() - Check and check a HDMI MPEG Source
> > infoframe,
> > + * and write it to binary buffer
> > + * @frame: HDMI MPEG Source infoframe
> > + * @buffer: destination buffer
> > + *
Re: [PATCH 06/18] video/hdmi: Handle the MPEG Source infoframe
On 09/20/18 20:51, Ville Syrjala wrote:
> From: Ville Syrjälä
>
> Add the code to deal with the MPEG source infoframe.
>
> Blindly typed from the spec, and totally untested.
I'm not sure this patch should be added at all. The CTA-861-G spec (section 6.7)
says that the implementation of this infoframe is not recommended due to
unresolved
issues.
I don't think I've ever seen it either.
It obviously doesn't hurt to have this code, but I prefer to wait until there
are devices that actively set/use this infoframe.
Regards,
Hans
>
> Cc: Thierry Reding
> Cc: Hans Verkuil
> Cc: linux-me...@vger.kernel.org
> Signed-off-by: Ville Syrjälä
> ---
> drivers/video/hdmi.c | 229
> +++
> include/linux/hdmi.h | 27 ++
> 2 files changed, 256 insertions(+)
>
> diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
> index 9507f668a569..3d24c7746c51 100644
> --- a/drivers/video/hdmi.c
> +++ b/drivers/video/hdmi.c
> @@ -706,6 +706,131 @@ hdmi_vendor_any_infoframe_pack(union
> hdmi_vendor_any_infoframe *frame,
> return hdmi_vendor_any_infoframe_pack_only(frame, buffer, size);
> }
>
> +/**
> + * hdmi_mpeg_source_infoframe_init() - initialize an HDMI MPEG Source
> infoframe
> + * @frame: HDMI MPEG Source infoframe
> + *
> + * Returns 0 on success or a negative error code on failure.
> + */
> +int hdmi_mpeg_source_infoframe_init(struct hdmi_mpeg_source_infoframe *frame)
> +{
> + memset(frame, 0, sizeof(*frame));
> +
> + frame->type = HDMI_INFOFRAME_TYPE_MPEG_SOURCE;
> + frame->version = 1;
> + frame->length = HDMI_MPEG_SOURCE_INFOFRAME_SIZE;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(hdmi_mpeg_source_infoframe_init);
> +
> +static int hdmi_mpeg_source_infoframe_check_only(const struct
> hdmi_mpeg_source_infoframe *frame)
> +{
> + if (frame->type != HDMI_INFOFRAME_TYPE_MPEG_SOURCE ||
> + frame->version != 1 ||
> + frame->length != HDMI_MPEG_SOURCE_INFOFRAME_SIZE)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +/**
> + * hdmi_mpeg_source_infoframe_check() - Check and check a HDMI MPEG Source
> infoframe
> + * @frame: HDMI MPEG Source infoframe
> + *
> + * Validates that the infoframe is consistent and updates derived fields
> + * (eg. length) based on other fields.
> + *
> + * Returns 0 on success or a negative error code on failure.
> + */
> +int hdmi_mpeg_source_infoframe_check(struct hdmi_mpeg_source_infoframe
> *frame)
> +{
> + return hdmi_mpeg_source_infoframe_check_only(frame);
> +}
> +EXPORT_SYMBOL(hdmi_mpeg_source_infoframe_check);
> +
> +/**
> + * hdmi_mpeg_source_infoframe_pack_only() - write HDMI MPEG Source infoframe
> to binary buffer
> + * @frame: HDMI MPEG Source infoframe
> + * @buffer: destination buffer
> + * @size: size of buffer
> + *
> + * Packs the information contained in the @frame structure into a binary
> + * representation that can be written into the corresponding controller
> + * registers. Also computes the checksum as required by section 5.3.5 of
> + * the HDMI 1.4 specification.
> + *
> + * Returns the number of bytes packed into the binary buffer or a negative
> + * error code on failure.
> + */
> +ssize_t hdmi_mpeg_source_infoframe_pack_only(const struct
> hdmi_mpeg_source_infoframe *frame,
> + void *buffer, size_t size)
> +{
> + u8 *ptr = buffer;
> + size_t length;
> + int ret;
> +
> + ret = hdmi_mpeg_source_infoframe_check_only(frame);
> + if (ret)
> + return ret;
> +
> + length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
> +
> + if (size < length)
> + return -ENOSPC;
> +
> + memset(buffer, 0, size);
> +
> + ptr[0] = frame->type;
> + ptr[1] = frame->version;
> + ptr[2] = frame->length;
> + ptr[3] = 0; /* checksum */
> +
> + /* start infoframe payload */
> + ptr += HDMI_INFOFRAME_HEADER_SIZE;
> +
> + ptr[0] = frame->mpeg_bit_rate >> 0;
> + ptr[1] = frame->mpeg_bit_rate >> 8;
> + ptr[2] = frame->mpeg_bit_rate >> 16;
> + ptr[3] = frame->mpeg_bit_rate >> 24;
> + ptr[4] = (frame->field_repeat << 4) | frame->mpeg_frame;
> +
> + hdmi_infoframe_set_checksum(buffer, length);
> +
> + return length;
> +}
> +EXPORT_SYMBOL(hdmi_mpeg_source_infoframe_pack_only);
> +
> +/**
> + * hdmi_mpeg_source_infoframe_pack() - Check and check a HDMI MPEG Source
> infoframe,
> + * and write it to binary buffer
> + * @frame: HDMI MPEG Source infoframe
> + * @buffer: destination buffer
> + * @size: size of buffer
> + *
> + * Validates that the infoframe is consistent and updates derived fields
> + * (eg. length) based on other fields, after which packs the information
> + * contained in the @frame structure into a binary representation that
> + * can be written into the corresponding controller registers. Also
> + * computes the checksum as required by section 5.3.5 of the HDMI 1.4
> + *
[PATCH 06/18] video/hdmi: Handle the MPEG Source infoframe
From: Ville Syrjälä
Add the code to deal with the MPEG source infoframe.
Blindly typed from the spec, and totally untested.
Cc: Thierry Reding
Cc: Hans Verkuil
Cc: linux-me...@vger.kernel.org
Signed-off-by: Ville Syrjälä
---
drivers/video/hdmi.c | 229 +++
include/linux/hdmi.h | 27 ++
2 files changed, 256 insertions(+)
diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
index 9507f668a569..3d24c7746c51 100644
--- a/drivers/video/hdmi.c
+++ b/drivers/video/hdmi.c
@@ -706,6 +706,131 @@ hdmi_vendor_any_infoframe_pack(union
hdmi_vendor_any_infoframe *frame,
return hdmi_vendor_any_infoframe_pack_only(frame, buffer, size);
}
+/**
+ * hdmi_mpeg_source_infoframe_init() - initialize an HDMI MPEG Source infoframe
+ * @frame: HDMI MPEG Source infoframe
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int hdmi_mpeg_source_infoframe_init(struct hdmi_mpeg_source_infoframe *frame)
+{
+ memset(frame, 0, sizeof(*frame));
+
+ frame->type = HDMI_INFOFRAME_TYPE_MPEG_SOURCE;
+ frame->version = 1;
+ frame->length = HDMI_MPEG_SOURCE_INFOFRAME_SIZE;
+
+ return 0;
+}
+EXPORT_SYMBOL(hdmi_mpeg_source_infoframe_init);
+
+static int hdmi_mpeg_source_infoframe_check_only(const struct
hdmi_mpeg_source_infoframe *frame)
+{
+ if (frame->type != HDMI_INFOFRAME_TYPE_MPEG_SOURCE ||
+ frame->version != 1 ||
+ frame->length != HDMI_MPEG_SOURCE_INFOFRAME_SIZE)
+ return -EINVAL;
+
+ return 0;
+}
+
+/**
+ * hdmi_mpeg_source_infoframe_check() - Check and check a HDMI MPEG Source
infoframe
+ * @frame: HDMI MPEG Source infoframe
+ *
+ * Validates that the infoframe is consistent and updates derived fields
+ * (eg. length) based on other fields.
+ *
+ * Returns 0 on success or a negative error code on failure.
+ */
+int hdmi_mpeg_source_infoframe_check(struct hdmi_mpeg_source_infoframe *frame)
+{
+ return hdmi_mpeg_source_infoframe_check_only(frame);
+}
+EXPORT_SYMBOL(hdmi_mpeg_source_infoframe_check);
+
+/**
+ * hdmi_mpeg_source_infoframe_pack_only() - write HDMI MPEG Source infoframe
to binary buffer
+ * @frame: HDMI MPEG Source infoframe
+ * @buffer: destination buffer
+ * @size: size of buffer
+ *
+ * Packs the information contained in the @frame structure into a binary
+ * representation that can be written into the corresponding controller
+ * registers. Also computes the checksum as required by section 5.3.5 of
+ * the HDMI 1.4 specification.
+ *
+ * Returns the number of bytes packed into the binary buffer or a negative
+ * error code on failure.
+ */
+ssize_t hdmi_mpeg_source_infoframe_pack_only(const struct
hdmi_mpeg_source_infoframe *frame,
+void *buffer, size_t size)
+{
+ u8 *ptr = buffer;
+ size_t length;
+ int ret;
+
+ ret = hdmi_mpeg_source_infoframe_check_only(frame);
+ if (ret)
+ return ret;
+
+ length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
+
+ if (size < length)
+ return -ENOSPC;
+
+ memset(buffer, 0, size);
+
+ ptr[0] = frame->type;
+ ptr[1] = frame->version;
+ ptr[2] = frame->length;
+ ptr[3] = 0; /* checksum */
+
+ /* start infoframe payload */
+ ptr += HDMI_INFOFRAME_HEADER_SIZE;
+
+ ptr[0] = frame->mpeg_bit_rate >> 0;
+ ptr[1] = frame->mpeg_bit_rate >> 8;
+ ptr[2] = frame->mpeg_bit_rate >> 16;
+ ptr[3] = frame->mpeg_bit_rate >> 24;
+ ptr[4] = (frame->field_repeat << 4) | frame->mpeg_frame;
+
+ hdmi_infoframe_set_checksum(buffer, length);
+
+ return length;
+}
+EXPORT_SYMBOL(hdmi_mpeg_source_infoframe_pack_only);
+
+/**
+ * hdmi_mpeg_source_infoframe_pack() - Check and check a HDMI MPEG Source
infoframe,
+ * and write it to binary buffer
+ * @frame: HDMI MPEG Source infoframe
+ * @buffer: destination buffer
+ * @size: size of buffer
+ *
+ * Validates that the infoframe is consistent and updates derived fields
+ * (eg. length) based on other fields, after which packs the information
+ * contained in the @frame structure into a binary representation that
+ * can be written into the corresponding controller registers. Also
+ * computes the checksum as required by section 5.3.5 of the HDMI 1.4
+ * specification.
+ *
+ * Returns the number of bytes packed into the binary buffer or a negative
+ * error code on failure.
+ */
+ssize_t hdmi_mpeg_source_infoframe_pack(struct hdmi_mpeg_source_infoframe
*frame,
+ void *buffer, size_t size)
+{
+ int ret;
+
+ ret = hdmi_mpeg_source_infoframe_check(frame);
+ if (ret)
+ return ret;
+
+ return hdmi_mpeg_source_infoframe_pack_only(frame, buffer, size);
+}
+EXPORT_SYMBOL(hdmi_mpeg_source_infoframe_pack);
+
/**
* hdmi_infoframe_check() - Check check a HDMI infoframe
* @frame: HDMI infoframe
@@
