[PATCH v4 11/11] drm: rcar-du: Support interlaced video output through vsp1

[Kieran Bingham]

Hi Laurent,


On 24/05/18 12:50, Laurent Pinchart wrote:
> Hi Kieran,
> 
> Thank you for the patch.
> 
> On Thursday, 3 May 2018 16:36:22 EEST Kieran Bingham wrote:
>> Use the newly exposed VSP1 interface to enable interlaced frame support
>> through the VSP1 lif pipelines.
> 
> s/lif/LIF/

Fixed.


>> Signed-off-by: Kieran Bingham <kieran.bingham+renesas at ideasonboard.com>
>> ---
>>  drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 1 +
>>  drivers/gpu/drm/rcar-du/rcar_du_vsp.c  | 3 +++
>>  2 files changed, 4 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
>> b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c index d71d709fe3d9..206532959ec9
>> 100644
>> --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
>> +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
>> @@ -289,6 +289,7 @@ static void rcar_du_crtc_set_display_timing(struct
>> rcar_du_crtc *rcrtc) /* Signal polarities */
>>  	value = ((mode->flags & DRM_MODE_FLAG_PVSYNC) ? DSMR_VSL : 0)
>>  	      | ((mode->flags & DRM_MODE_FLAG_PHSYNC) ? DSMR_HSL : 0)
>> +	      | ((mode->flags & DRM_MODE_FLAG_INTERLACE) ? DSMR_ODEV : 0)
> 
> How will this affect Gen2 ?.

The bit is documented identically for Gen2. Potentially / Probably it
'might' reverse the fields... I'm not certain yet. I don't have access
to a Gen2 platform to test.

I'll see if this change can be dropped, but I think it is playing a role
in ensuring that the field detection occurs in VSP1 through the
VI6_STATUS_FLD_STD() field. (see vsp1_dlm_irq_frame_end())


> Could you document what this change does in the 
> commit message ?

This sets the position in the buffer of the ODDF. With this set, the ODD
field is located in the second half (BOTTOM) of the same frame of the
interlace display.

Otherwise, it's in the first half (TOP)

I faced some issues as to the ordering when testing, so I suspect this
might actually be related to that. (re VI6_STATUS_FLD_STD in
vsp1_dlm_irq_frame_end()).

As you mention - this may have a negative effect on the Gen2
implementation - so it needs considering with that.


/me to investigate further.



> 
>>  	      | DSMR_DIPM_DISP | DSMR_CSPM;
>>
>>  	rcar_du_crtc_write(rcrtc, DSMR, value);
>>
>> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
>> b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c index af7822a66dee..c7b37232ee91
>> 100644
>> --- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
>> +++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
>> @@ -186,6 +186,9 @@ static void rcar_du_vsp_plane_setup(struct
>> rcar_du_vsp_plane *plane) };
>>  	unsigned int i;
>>
>> +	cfg.interlaced = !!(plane->plane.state->crtc->mode.flags
>> +			    & DRM_MODE_FLAG_INTERLACE);
>> +
>>  	cfg.src.left = state->state.src.x1 >> 16;
>>  	cfg.src.top = state->state.src.y1 >> 16;
>>  	cfg.src.width = drm_rect_width(&state->state.src) >> 16;