>-----Original Message----- >From: dri-devel [mailto:dri-devel-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Ville >Syrjälä >Sent: Tuesday, May 14, 2019 1:20 AM >To: Shankar, Uma <uma.shankar@xxxxxxxxx> >Cc: dcastagna@xxxxxxxxxxxx; jonas@xxxxxxxxx; intel-gfx@xxxxxxxxxxxxxxxxxxxxx; >emil.l.velikov@xxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx; >seanpaul@xxxxxxxxxxxx; Syrjala, Ville <ville.syrjala@xxxxxxxxx>; Lankhorst, Maarten ><maarten.lankhorst@xxxxxxxxx> >Subject: Re: [v9 12/13] video/hdmi: Add Unpack function for DRM infoframe > >On Thu, May 09, 2019 at 12:08:52AM +0530, Uma Shankar wrote: >> Added unpack function for DRM infoframe for dynamic range and >> mastering infoframe readout. >> >> Suggested-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> >> Signed-off-by: Uma Shankar <uma.shankar@xxxxxxxxx> >> --- >> drivers/video/hdmi.c | 54 >> ++++++++++++++++++++++++++++++++++++++++++++++++++++ >> include/linux/hdmi.h | 1 + >> 2 files changed, 55 insertions(+) >> >> diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c index >> 717ed7fb..110d405 100644 >> --- a/drivers/video/hdmi.c >> +++ b/drivers/video/hdmi.c >> @@ -1801,6 +1801,57 @@ static int hdmi_audio_infoframe_unpack(struct >> hdmi_audio_infoframe *frame, } >> >> /** >> + * hdmi_drm_infoframe_unpack() - unpack binary buffer to a HDMI DRM >> +infoframe >> + * @frame: HDMI DRM infoframe >> + * @buffer: source buffer >> + * @size: size of buffer >> + * >> + * Unpacks the information contained in binary @buffer into a >> +structured >> + * @frame of the HDMI Dynamic Range and Mastering (DRM) 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_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame, >> + const void *buffer, size_t size) { >> + const u8 *ptr = buffer; >> + int ret; >> + >> + if (size < HDMI_INFOFRAME_SIZE(DRM)) >> + return -EINVAL; >> + >> + if (ptr[0] != HDMI_INFOFRAME_TYPE_DRM || >> + ptr[1] != 1 || >> + ptr[2] != HDMI_DRM_INFOFRAME_SIZE) >> + return -EINVAL; >> + >> + if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(DRM)) != 0) >> + return -EINVAL; >> + >> + ret = hdmi_drm_infoframe_init(frame); >> + if (ret) >> + return ret; >> + >> + frame->length = ptr[2]; > >The length handling is inconsistnet between the compute and readout sides. I would >suggest for now just put the length initialization into hdmi_drm_infoframe_init() (and >remove it from the drm code), and check it in the check_only(). We can revisit it >if/when other metadata formats become relevant. Sure, will update this. >> + ptr += HDMI_INFOFRAME_HEADER_SIZE; >> + >> + frame->eotf = ptr[0] & 0x7; >> + frame->metadata_type = ptr[1] & 0x7; >> + >> + memcpy(&frame->display_primaries, &ptr[2], 12); >> + memcpy(&frame->white_point, &ptr[14], 4); > >Endianness fail. Ok, will explicitly copy these. >> + >> + frame->max_display_mastering_luminance = (ptr[19] << 8) | ptr[18]; >> + frame->min_display_mastering_luminance = (ptr[21] << 8) | ptr[20]; >> + frame->max_cll = (ptr[23] << 8) | ptr[22]; >> + frame->max_fall = (ptr[25] << 8) | ptr[24]; >> + >> + return 0; >> +} >> + >> +/** >> * hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe >> * @frame: HDMI infoframe >> * @buffer: source buffer >> @@ -1826,6 +1877,9 @@ int hdmi_infoframe_unpack(union hdmi_infoframe >*frame, >> case HDMI_INFOFRAME_TYPE_AVI: >> ret = hdmi_avi_infoframe_unpack(&frame->avi, buffer, size); >> break; >> + case HDMI_INFOFRAME_TYPE_DRM: >> + ret = hdmi_drm_infoframe_unpack(&frame->drm, buffer, size); >> + break; >> case HDMI_INFOFRAME_TYPE_SPD: >> ret = hdmi_spd_infoframe_unpack(&frame->spd, buffer, size); >> break; >> diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h index >> 3d7f10f..ee55ba5 100644 >> --- a/include/linux/hdmi.h >> +++ b/include/linux/hdmi.h >> @@ -56,6 +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_DRM_INFOFRAME_SIZE 26 >> >> #define HDMI_INFOFRAME_SIZE(type) \ >> (HDMI_INFOFRAME_HEADER_SIZE + HDMI_ ## type ## _INFOFRAME_SIZE) >> -- >> 1.9.1 >> >> _______________________________________________ >> dri-devel mailing list >> dri-devel@xxxxxxxxxxxxxxxxxxxxx >> https://lists.freedesktop.org/mailman/listinfo/dri-devel > >-- >Ville Syrjälä >Intel >_______________________________________________ >dri-devel mailing list >dri-devel@xxxxxxxxxxxxxxxxxxxxx >https://lists.freedesktop.org/mailman/listinfo/dri-devel _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
