On Mon 25 June 2012 15:18:41 Laurent Pinchart wrote:
> Hi Hans,
>
> On Monday 25 June 2012 15:08:10 Hans Verkuil wrote:
> > On Mon 25 June 2012 14:54:39 Laurent Pinchart wrote:
> > > On Monday 25 June 2012 16:37:30 Manjunath Hadli wrote:
> > > > add hardware clipping support for VPIF output data. This
> > > > is needed as it is possible that the external encoder
> > > > might get confused between the FF or 00 which are a part
> > > > of the data and that of the SAV or EAV codes.
> > > >
> > > > Signed-off-by: Manjunath Hadli <manjunath.hadli@xxxxxx>
> > > > Signed-off-by: Lad, Prabhakar <prabhakar.lad@xxxxxx>
> > > > ---
> > > >
> > > > drivers/media/video/davinci/vpif.h | 30 +++++++++++++++++++++
> > > > drivers/media/video/davinci/vpif_display.c | 10 +++++++++
> > > > include/media/davinci/vpif_types.h | 2 +
> > > > 3 files changed, 42 insertions(+), 0 deletions(-)
> > > >
> > > > diff --git a/drivers/media/video/davinci/vpif.h
> > > > b/drivers/media/video/davinci/vpif.h index a4d2141..c2ce4d9 100644
> > > > --- a/drivers/media/video/davinci/vpif.h
> > > > +++ b/drivers/media/video/davinci/vpif.h
> > > > @@ -211,6 +211,12 @@ static inline void vpif_clr_bit(u32 reg, u32 bit)
> > > >
> > > > #define VPIF_CH3_INT_CTRL_SHIFT (6)
> > > > #define VPIF_CH_INT_CTRL_SHIFT (6)
> > > >
> > > > +#define VPIF_CH2_CLIP_ANC_EN 14
> > > > +#define VPIF_CH2_CLIP_ACTIVE_EN 13
> > > > +
> > > > +#define VPIF_CH3_CLIP_ANC_EN 14
> > > > +#define VPIF_CH3_CLIP_ACTIVE_EN 13
> > > > +
> > > >
> > > > /* enabled interrupt on both the fields on vpid_ch0_ctrl register */
> > > > #define channel0_intr_assert() (regw((regr(VPIF_CH0_CTRL)|\
> > > >
> > > > (VPIF_INT_BOTH << VPIF_CH0_INT_CTRL_SHIFT)), VPIF_CH0_CTRL))
> > > >
> > > > @@ -515,6 +521,30 @@ static inline void channel3_raw_enable(int enable,
> > > > u8
> > > > index) vpif_clr_bit(VPIF_CH3_CTRL, mask);
> > > >
> > > > }
> > > >
> > > > +/* function to enable clipping (for both active and blanking regions)
> > > > on ch 2 */ +static inline void channel2_clipping_enable(int enable)
> > > > +{
> > > > + if (enable) {
> > > > + vpif_set_bit(VPIF_CH2_CTRL, VPIF_CH2_CLIP_ANC_EN);
> > > > + vpif_set_bit(VPIF_CH2_CTRL, VPIF_CH2_CLIP_ACTIVE_EN);
> > > > + } else {
> > > > + vpif_clr_bit(VPIF_CH2_CTRL, VPIF_CH2_CLIP_ANC_EN);
> > > > + vpif_clr_bit(VPIF_CH2_CTRL, VPIF_CH2_CLIP_ACTIVE_EN);
> > > > + }
> > > > +}
> > > > +
> > > > +/* function to enable clipping (for both active and blanking regions)
> > > > on ch 2 */ +static inline void channel3_clipping_enable(int enable)
> > > > +{
> > > > + if (enable) {
> > > > + vpif_set_bit(VPIF_CH3_CTRL, VPIF_CH3_CLIP_ANC_EN);
> > > > + vpif_set_bit(VPIF_CH3_CTRL, VPIF_CH3_CLIP_ACTIVE_EN);
> > > > + } else {
> > > > + vpif_clr_bit(VPIF_CH3_CTRL, VPIF_CH3_CLIP_ANC_EN);
> > > > + vpif_clr_bit(VPIF_CH3_CTRL, VPIF_CH3_CLIP_ACTIVE_EN);
> > > > + }
> > > > +}
> > > > +
> > > >
> > > > /* inline function to set buffer addresses in case of Y/C non mux mode
> > > > */
> > > > static inline void ch2_set_videobuf_addr_yc_nmux(unsigned long
> > > >
> > > > top_strt_luma, unsigned long btm_strt_luma,
> > > > diff --git a/drivers/media/video/davinci/vpif_display.c
> > > > b/drivers/media/video/davinci/vpif_display.c index 61ea8bc..4436ef6
> > > > 100644
> > > > --- a/drivers/media/video/davinci/vpif_display.c
> > > > +++ b/drivers/media/video/davinci/vpif_display.c
> > > > @@ -1046,6 +1046,8 @@ static int vpif_streamon(struct file *file, void
> > > > *priv, channel2_intr_assert();
> > > >
> > > > channel2_intr_enable(1);
> > > > enable_channel2(1);
> > > >
> > > > + if (vpif_config_data->ch2_clip_en)
> > > > + channel2_clipping_enable(1);
> > > >
> > > > }
> > > >
> > > > if ((VPIF_CHANNEL3_VIDEO == ch->channel_id)
> > > >
> > > > @@ -1053,6 +1055,8 @@ static int vpif_streamon(struct file *file, void
> > > > *priv, channel3_intr_assert();
> > > >
> > > > channel3_intr_enable(1);
> > > > enable_channel3(1);
> > > >
> > > > + if (vpif_config_data->ch3_clip_en)
> > > > + channel3_clipping_enable(1);
> > > >
> > > > }
> > > > channel_first_int[VPIF_VIDEO_INDEX][ch->channel_id] = 1;
> > > >
> > > > }
> > > >
> > > > @@ -1065,6 +1069,8 @@ static int vpif_streamoff(struct file *file, void
> > > > *priv, struct vpif_fh *fh = priv;
> > > >
> > > > struct channel_obj *ch = fh->channel;
> > > > struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
> > > >
> > > > + struct vpif_display_config *vpif_config_data =
> > > > + vpif_dev->platform_data;
> > > >
> > > > if (buftype != V4L2_BUF_TYPE_VIDEO_OUTPUT) {
> > > >
> > > > vpif_err("buffer type not supported\n");
> > > >
> > > > @@ -1084,11 +1090,15 @@ static int vpif_streamoff(struct file *file,
> > > > void
> > > > *priv, if (buftype == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
> > > >
> > > > /* disable channel */
> > > > if (VPIF_CHANNEL2_VIDEO == ch->channel_id) {
> > > >
> > > > + if (vpif_config_data->ch2_clip_en)
> > > > + channel2_clipping_enable(0);
> > > >
> > > > enable_channel2(0);
> > > > channel2_intr_enable(0);
> > > >
> > > > }
> > > > if ((VPIF_CHANNEL3_VIDEO == ch->channel_id) ||
> > > >
> > > > (2 == common->started)) {
> > > >
> > > > + if (vpif_config_data->ch3_clip_en)
> > > > + channel3_clipping_enable(0);
> > > >
> > > > enable_channel3(0);
> > > > channel3_intr_enable(0);
> > > >
> > > > }
> > > >
> > > > diff --git a/include/media/davinci/vpif_types.h
> > > > b/include/media/davinci/vpif_types.h index bd8217c..d8f6ab1 100644
> > > > --- a/include/media/davinci/vpif_types.h
> > > > +++ b/include/media/davinci/vpif_types.h
> > > > @@ -50,6 +50,8 @@ struct vpif_display_config {
> > > >
> > > > const char **output;
> > > > int output_count;
> > > > const char *card_name;
> > > >
> > > > + bool ch2_clip_en;
> > > > + bool ch3_clip_en;
> > >
> > > Instead of hardcoding this in platform data, I think it would be better to
> > > make this runtime-configurable. One option is to use the value of the
> > > v4l2_pix_format::colorspace field configured by userspace. We already have
> > > V4L2_COLORSPACE_JPEG which maps to the full 0-255 range, but we're missing
> > > a colorspace for the clipped 1-254 range used by the VPIF and I'm not
> > > sure whether it would really make sense to add one. Another option is to
> > > use a V4L2 control.
> >
> > This is something for a V4L2 control I think since clipping is colorspace
> > independent (you have the same situation for e.g. YCbCr).
>
> But some colorspaces define ranges smaller than 0-255.
Just because they define a smaller range doesn't mean you actually get that.
>From personal experience I can assure you that those are two different things :-)
Regards,
Hans
> In this particular case
> I agree with you though, as the hardware clips to 1-255 without taking
> colorspaces into account.
>
>
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