On Tue, Jul 04, 2017 at 11:41:27AM +0200, Andrzej Hajda wrote:
> On 03.07.2017 21:19, ville.syrjala@xxxxxxxxxxxxxxx wrote:
> > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> >
> > HDMI 2.0 Appendix F suggest that we should keep sending the infoframe
> > when switching from 3D to 2D mode, even if the infoframe isn't strictly
> > necessary (ie. not needed to transmit the VIC or stereo information).
> > This is a workaround against some sinks that fail to realize that they
> > should switch from 3D to 2D mode when the source stop transmitting
> > the infoframe.
> >
> > Cc: Shashank Sharma <shashank.sharma@xxxxxxxxx>
> > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > ---
> > drivers/video/hdmi.c | 18 +++++++++---------
> > 1 file changed, 9 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c
> > index 1cf907ecded4..af0c8dad29eb 100644
> > --- a/drivers/video/hdmi.c
> > +++ b/drivers/video/hdmi.c
> > @@ -341,10 +341,6 @@ ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
> > u8 *ptr = buffer;
> > size_t length;
> >
> > - /* empty info frame */
> > - if (frame->vic == 0 && frame->s3d_struct == HDMI_3D_STRUCTURE_INVALID)
> > - return -EINVAL;
> > -
> > /* only one of those can be supplied */
> > if (frame->vic != 0 && frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID)
> > return -EINVAL;
> > @@ -352,8 +348,10 @@ ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
> > /* for side by side (half) we also need to provide 3D_Ext_Data */
> > if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
> > frame->length = 6;
> > - else
> > + else if (frame->vic != 0 || frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID)
> > frame->length = 5;
> > + else
> > + frame->length = 4;
> >
> > length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
> >
> > @@ -372,14 +370,16 @@ ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
> > ptr[5] = 0x0c;
> > ptr[6] = 0x00;
> >
> > - if (frame->vic) {
> > - ptr[7] = 0x1 << 5; /* video format */
> > - ptr[8] = frame->vic;
> > - } else {
> > + if (frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID) {
> > ptr[7] = 0x2 << 5; /* video format */
> > ptr[8] = (frame->s3d_struct & 0xf) << 4;
> > if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
> > ptr[9] = (frame->s3d_ext_data & 0xf) << 4;
> > + } else if (frame->vic) {
> > + ptr[7] = 0x1 << 5; /* video format */
> > + ptr[8] = frame->vic;
> > + } else {
> > + ptr[7] = 0x0 << 5; /* video format */
>
> Changed order of conditionals (vic,s3d versus s3d,vic) could result in
> different output, but only in case of incorrect VSIFs, so probably harmless.
Such an infoframe would have been rejected earlier, so can't happen.
I did the reordering because I wanted the order to be the same
here as it's where the length is determined. easier to cross check that
way.
>
> Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
Thanks.
>
> --
> Regards
> Andrzej
>
> > }
> >
> > hdmi_infoframe_set_checksum(buffer, length);
>
--
Ville Syrjälä
Intel OTC
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