Re: [PATCH 06/18] video/hdmi: Handle the MPEG Source infoframe

Ville Syrjälä
2018-09-21T13:53:14Z

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 <ville.syrjala@linux.intel.com>
> >
> > 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 <thierry.reding@gmail.com>
> > Cc: Hans Verkuil <hans.verkuil@cisco.com>
> > Cc: linux-media@vger.kernel.org
> > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > ---
> > 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
> > @@ -727,6 +852,8 @@ hdmi_infoframe_check(union hdmi_infoframe *frame)
> > return hdmi_audio_infoframe_check(&frame->audio);
> > case HDMI_INFOFRAME_TYPE_VENDOR:
> > return hdmi_vendor_any_infoframe_check(&frame->vendor);
> > + case HDMI_INFOFRAME_TYPE_MPEG_SOURCE:
> > + return hdmi_mpeg_source_infoframe_check(&frame->mpeg_source);
> > default:
> > WARN(1, "Bad infoframe type %d\n", frame->any.type);
> > return -EINVAL;
> > @@ -770,6 +897,10 @@ hdmi_infoframe_pack_only(const union hdmi_infoframe *frame, void *buffer, size_t
> > length = hdmi_vendor_any_infoframe_pack_only(&frame->vendor,
> > buffer, size);
> > break;
> > + case HDMI_INFOFRAME_TYPE_MPEG_SOURCE:
> > + length = hdmi_mpeg_source_infoframe_pack_only(&frame->mpeg_source,
> > + buffer, size);
> > + break;
> > default:
> > WARN(1, "Bad infoframe type %d\n", frame->any.type);
> > length = -EINVAL;
> > @@ -816,6 +947,10 @@ hdmi_infoframe_pack(union hdmi_infoframe *frame,
> > length = hdmi_vendor_any_infoframe_pack(&frame->vendor,
> > buffer, size);
> > break;
> > + case HDMI_INFOFRAME_TYPE_MPEG_SOURCE:
> > + length = hdmi_mpeg_source_infoframe_pack(&frame->mpeg_source,
> > + buffer, size);
> > + break;
> > default:
> > WARN(1, "Bad infoframe type %d\n", frame->any.type);
> > length = -EINVAL;
> > @@ -838,6 +973,8 @@ static const char *hdmi_infoframe_type_get_name(enum hdmi_infoframe_type type)
> > return "Source Product Description (SPD)";
> > case HDMI_INFOFRAME_TYPE_AUDIO:
> > return "Audio";
> > + case HDMI_INFOFRAME_TYPE_MPEG_SOURCE:
> > + return "MPEG Source";
> > }
> > return "Reserved";
> > }
> > @@ -1349,6 +1486,46 @@ hdmi_vendor_any_infoframe_log(const char *level,
> > }
> > }
> >
> > +static const char *
> > +hdmi_mpeg_frame_get_name(enum hdmi_mpeg_frame frame)
> > +{
> > + if (frame < 0 || frame > 3)
> > + return "invalid";
> > +
> > + switch (frame) {
> > + case HDMI_MPEG_FRAME_UNKNOWN:
> > + return "Unknown";
> > + case HDMI_MPEG_FRAME_I_PICTURE:
> > + return "I Picture";
> > + case HDMI_MPEG_FRAME_B_PICTURE:
> > + return "B Picture";
> > + case HDMI_MPEG_FRAME_P_PICTURE:
> > + return "P Picture";
> > + }
> > + return "Reserved";
> > +}
> > +
> > +/**
> > + * hdmi_mpeg_source_infoframe_log() - log info of HDMI MPEG Source infoframe
> > + * @level: logging level
> > + * @dev: device
> > + * @frame: HDMI MPEG Source infoframe
> > + */
> > +static void hdmi_mpeg_source_infoframe_log(const char *level,
> > + struct device *dev,
> > + const struct hdmi_mpeg_source_infoframe *frame)
> > +{
> > + hdmi_infoframe_log_header(level, dev,
> > + (const struct hdmi_any_infoframe *)frame);
> > +
> > + hdmi_log(" MPEG bit rate: %d Hz\n",
> > + frame->mpeg_bit_rate);
> > + hdmi_log(" MPEG frame: %s\n",
> > + hdmi_mpeg_frame_get_name(frame->mpeg_frame));
> > + hdmi_log(" field repeat: %s\n",
> > + frame->field_repeat ? "Yes" : "No");
> > +}
> > +
> > /**
> > * hdmi_infoframe_log() - log info of HDMI infoframe
> > * @level: logging level
> > @@ -1372,6 +1549,9 @@ void hdmi_infoframe_log(const char *level,
> > case HDMI_INFOFRAME_TYPE_VENDOR:
> > hdmi_vendor_any_infoframe_log(level, dev, &frame->vendor);
> > break;
> > + case HDMI_INFOFRAME_TYPE_MPEG_SOURCE:
> > + hdmi_mpeg_source_infoframe_log(level, dev, &frame->mpeg_source);
> > + break;
> > }
> > }
> > EXPORT_SYMBOL(hdmi_infoframe_log);
> > @@ -1614,6 +1794,52 @@ hdmi_vendor_any_infoframe_unpack(union hdmi_vendor_any_infoframe *frame,
> > return 0;
> > }
> >
> > +/**
> > + * hdmi_mpeg_source_infoframe_unpack() - unpack binary buffer to a HDMI MPEG Source infoframe
> > + * @frame: HDMI MPEG Source infoframe
> > + * @buffer: source buffer
> > + * @size: size of buffer
> > + *
> > + * Unpacks the information contained in binary @buffer into a structured
> > + * @frame of the HDMI MPEG Source information frame.
> > + * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
> > + * specification.
> > + *
> > + * Returns 0 on success or a negative error code on failure.
> > + */
> > +static int hdmi_mpeg_source_infoframe_unpack(struct hdmi_mpeg_source_infoframe *frame,
> > + const void *buffer, size_t size)
> > +{
> > + const u8 *ptr = buffer;
> > + int ret;
> > +
> > + if (size < HDMI_INFOFRAME_SIZE(MPEG_SOURCE))
> > + return -EINVAL;
> > +
> > + if (ptr[0] != HDMI_INFOFRAME_TYPE_MPEG_SOURCE ||
> > + ptr[1] != 1 ||
> > + ptr[2] != HDMI_MPEG_SOURCE_INFOFRAME_SIZE) {
> > + return -EINVAL;
> > + }
> > +
> > + if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(MPEG_SOURCE)) != 0)
> > + return -EINVAL;
> > +
> > + ret = hdmi_mpeg_source_infoframe_init(frame);
> > + if (ret)
> > + return ret;
> > +
> > + ptr += HDMI_INFOFRAME_HEADER_SIZE;
> > +
> > + frame->mpeg_bit_rate =
> > + (ptr[0] << 0) | (ptr[1] << 8) |
> > + (ptr[2] << 16) | (ptr[3] << 24);
> > + frame->mpeg_frame = ptr[4] & 0x3;
> > + frame->field_repeat = ptr[4] & 0x10;
> > +
> > + return 0;
> > +}
> > +
> > /**
> > * hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe
> > * @frame: HDMI infoframe
> > @@ -1649,6 +1875,9 @@ int hdmi_infoframe_unpack(union hdmi_infoframe *frame,
> > case HDMI_INFOFRAME_TYPE_VENDOR:
> > ret = hdmi_vendor_any_infoframe_unpack(&frame->vendor, buffer, size);
> > break;
> > + case HDMI_INFOFRAME_TYPE_MPEG_SOURCE:
> > + ret = hdmi_mpeg_source_infoframe_unpack(&frame->mpeg_source, buffer, size);
> > + break;
> > default:
> > ret = -EINVAL;
> > break;
> > diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h
> > index 80521d9591a1..2c9322f7538d 100644
> > --- a/include/linux/hdmi.h
> > +++ b/include/linux/hdmi.h
> > @@ -47,6 +47,7 @@ enum hdmi_infoframe_type {
> > HDMI_INFOFRAME_TYPE_AVI = 0x82,
> > HDMI_INFOFRAME_TYPE_SPD = 0x83,
> > HDMI_INFOFRAME_TYPE_AUDIO = 0x84,
> > + HDMI_INFOFRAME_TYPE_MPEG_SOURCE = 0x85,
> > };
> >
> > #define HDMI_IEEE_OUI 0x000c03
> > @@ -55,6 +56,7 @@ enum hdmi_infoframe_type {
> > #define HDMI_AVI_INFOFRAME_SIZE 13
> > #define HDMI_SPD_INFOFRAME_SIZE 25
> > #define HDMI_AUDIO_INFOFRAME_SIZE 10
> > +#define HDMI_MPEG_SOURCE_INFOFRAME_SIZE 10
> >
> > #define HDMI_INFOFRAME_SIZE(type) \
> > (HDMI_INFOFRAME_HEADER_SIZE + HDMI_ ## type ## _INFOFRAME_SIZE)
> > @@ -337,6 +339,29 @@ union hdmi_vendor_any_infoframe {
> > struct hdmi_vendor_infoframe hdmi;
> > };
> >
> > +enum hdmi_mpeg_frame {
> > + HDMI_MPEG_FRAME_UNKNOWN,
> > + HDMI_MPEG_FRAME_I_PICTURE,
> > + HDMI_MPEG_FRAME_B_PICTURE,
> > + HDMI_MPEG_FRAME_P_PICTURE,
> > +};
> > +
> > +struct hdmi_mpeg_source_infoframe {
> > + enum hdmi_infoframe_type type;
> > + unsigned char version;
> > + unsigned char length;
> > + unsigned int mpeg_bit_rate;
> > + enum hdmi_mpeg_frame mpeg_frame;
> > + bool field_repeat;
> > +};
> > +
> > +int hdmi_mpeg_source_infoframe_init(struct hdmi_mpeg_source_infoframe *frame);
> > +ssize_t hdmi_mpeg_source_infoframe_pack(struct hdmi_mpeg_source_infoframe *frame,
> > + void *buffer, size_t size);
> > +ssize_t hdmi_mpeg_source_infoframe_pack_only(const struct hdmi_mpeg_source_infoframe *frame,
> > + void *buffer, size_t size);
> > +int hdmi_mpeg_source_infoframe_check(struct hdmi_mpeg_source_infoframe *frame);
> > +
> > /**
> > * union hdmi_infoframe - overall union of all abstract infoframe representations
> > * @any: generic infoframe
> > @@ -344,6 +369,7 @@ union hdmi_vendor_any_infoframe {
> > * @spd: spd infoframe
> > * @vendor: union of all vendor infoframes
> > * @audio: audio infoframe
> > + * @mpeg_source: mpeg source infoframe
> > *
> > * This is used by the generic pack function. This works since all infoframes
> > * have the same header which also indicates which type of infoframe should be
> > @@ -355,6 +381,7 @@ union hdmi_infoframe {
> > struct hdmi_spd_infoframe spd;
> > union hdmi_vendor_any_infoframe vendor;
> > struct hdmi_audio_infoframe audio;
> > + struct hdmi_mpeg_source_infoframe mpeg_source;
> > };
> >
> > ssize_t hdmi_infoframe_pack(union hdmi_infoframe *frame, void *buffer,
> >

--
Ville Syrjälä
Intel
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