Re: [PATCH v4 10/11] media: vsp1: Support Interlaced display pipelines

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Kieran,

Thank you for the patch.

On Thursday, 3 May 2018 16:36:21 EEST Kieran Bingham wrote:
> Calculate the top and bottom fields for the interlaced frames and
> utilise the extended display list command feature to implement the
> auto-field operations. This allows the DU to update the VSP2 registers
> dynamically based upon the currently processing field.
> 
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> 
> ---
> v3:
>  - Pass DL through partition calls to allow autocmd's to be retrieved
>  - Document interlaced field in struct vsp1_du_atomic_config
> 
> v2:
>  - fix erroneous BIT value which enabled interlaced
>  - fix field handling at frame_end interrupt
> ---
>  drivers/media/platform/vsp1/vsp1_dl.c   | 10 ++++-
>  drivers/media/platform/vsp1/vsp1_drm.c  | 11 ++++-
>  drivers/media/platform/vsp1/vsp1_regs.h |  1 +-
>  drivers/media/platform/vsp1/vsp1_rpf.c  | 71 ++++++++++++++++++++++++--
>  drivers/media/platform/vsp1/vsp1_rwpf.h |  1 +-
>  include/media/vsp1.h                    |  2 +-
>  6 files changed, 93 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/platform/vsp1/vsp1_dl.c
> b/drivers/media/platform/vsp1/vsp1_dl.c index d33ae5f125bd..bbe9f3006f71
> 100644
> --- a/drivers/media/platform/vsp1/vsp1_dl.c
> +++ b/drivers/media/platform/vsp1/vsp1_dl.c
> @@ -906,6 +906,8 @@ void vsp1_dl_list_commit(struct vsp1_dl_list *dl, bool
> internal) */
>  unsigned int vsp1_dlm_irq_frame_end(struct vsp1_dl_manager *dlm)
>  {
> +	struct vsp1_device *vsp1 = dlm->vsp1;
> +	u32 status = vsp1_read(vsp1, VI6_STATUS);
>  	unsigned int flags = 0;
> 
>  	spin_lock(&dlm->lock);
> @@ -931,6 +933,14 @@ unsigned int vsp1_dlm_irq_frame_end(struct
> vsp1_dl_manager *dlm) goto done;
> 
>  	/*
> +	 * Progressive streams report only TOP fields. If we have a BOTTOM
> +	 * field, we are interlaced, and expect the frame to complete on the
> +	 * next frame end interrupt.
> +	 */
> +	if (status & VI6_STATUS_FLD_STD(dlm->index))
> +		goto done;
> +
> +	/*
>  	 * The device starts processing the queued display list right after the
>  	 * frame end interrupt. The display list thus becomes active.
>  	 */
> diff --git a/drivers/media/platform/vsp1/vsp1_drm.c
> b/drivers/media/platform/vsp1/vsp1_drm.c index 2c3db8b8adce..cc29c9d96bb7
> 100644
> --- a/drivers/media/platform/vsp1/vsp1_drm.c
> +++ b/drivers/media/platform/vsp1/vsp1_drm.c
> @@ -811,6 +811,17 @@ int vsp1_du_atomic_update(struct device *dev, unsigned
> int pipe_index, return -EINVAL;
>  	}
> 
> +	if (!(vsp1_feature(vsp1, VSP1_HAS_EXT_DL)) && cfg->interlaced) {

Nitpicking, writing the condition as

	if (cfg->interlaced && !(vsp1_feature(vsp1, VSP1_HAS_EXT_DL)))

would match the comment better. You can also drop the parentheses around the 
vsp1_feature() call.

> +		/*
> +		 * Interlaced support requires extended display lists to
> +		 * provide the auto-fld feature with the DU.
> +		 */
> +		dev_dbg(vsp1->dev, "Interlaced unsupported on this output\n");

Could we catch this in the DU driver to fail atomic test ?

> +		return -EINVAL;
> +	}
> +
> +	rpf->interlaced = cfg->interlaced;
> +
>  	rpf->fmtinfo = fmtinfo;
>  	rpf->format.num_planes = fmtinfo->planes;
>  	rpf->format.plane_fmt[0].bytesperline = cfg->pitch;
> diff --git a/drivers/media/platform/vsp1/vsp1_regs.h
> b/drivers/media/platform/vsp1/vsp1_regs.h index d054767570c1..a2ac65cc5155
> 100644
> --- a/drivers/media/platform/vsp1/vsp1_regs.h
> +++ b/drivers/media/platform/vsp1/vsp1_regs.h
> @@ -28,6 +28,7 @@
>  #define VI6_SRESET_SRTS(n)		(1 << (n))
> 
>  #define VI6_STATUS			0x0038
> +#define VI6_STATUS_FLD_STD(n)		(1 << ((n) + 28))
>  #define VI6_STATUS_SYS_ACT(n)		(1 << ((n) + 8))
> 
>  #define VI6_WPF_IRQ_ENB(n)		(0x0048 + (n) * 12)
> diff --git a/drivers/media/platform/vsp1/vsp1_rpf.c
> b/drivers/media/platform/vsp1/vsp1_rpf.c index 8fae7c485642..511b2e127820
> 100644
> --- a/drivers/media/platform/vsp1/vsp1_rpf.c
> +++ b/drivers/media/platform/vsp1/vsp1_rpf.c
> @@ -20,6 +20,20 @@
>  #define RPF_MAX_WIDTH				8190
>  #define RPF_MAX_HEIGHT				8190
> 
> +/* Pre extended display list command data structure */
> +struct vsp1_extcmd_auto_fld_body {
> +	u32 top_y0;
> +	u32 bottom_y0;
> +	u32 top_c0;
> +	u32 bottom_c0;
> +	u32 top_c1;
> +	u32 bottom_c1;
> +	u32 reserved0;
> +	u32 reserved1;
> +} __packed;
> +
> +#define VSP1_DL_EXT_AUTOFLD_INT		BIT(0)

Should the bit definition be moved to vsp1_regs.h ?

>  /* ------------------------------------------------------------------------
>   * Device Access
>   */
> @@ -64,6 +78,14 @@ static void rpf_configure_stream(struct vsp1_entity
> *entity, pstride |= format->plane_fmt[1].bytesperline
>  			<< VI6_RPF_SRCM_PSTRIDE_C_SHIFT;
> 
> +	/*
> +	 * pstride has both STRIDE_Y and STRIDE_C, but multiplying the whole
> +	 * of pstride by 2 is conveniently OK here as we are multiplying both
> +	 * values.
> +	 */
> +	if (rpf->interlaced)
> +		pstride *= 2;
> +
>  	vsp1_rpf_write(rpf, dlb, VI6_RPF_SRCM_PSTRIDE, pstride);
> 
>  	/* Format */
> @@ -100,6 +122,9 @@ static void rpf_configure_stream(struct vsp1_entity
> *entity, top = compose->top;
>  	}
> 
> +	if (rpf->interlaced)
> +		top /= 2;
> +
>  	vsp1_rpf_write(rpf, dlb, VI6_RPF_LOC,
>  		       (left << VI6_RPF_LOC_HCOORD_SHIFT) |
>  		       (top << VI6_RPF_LOC_VCOORD_SHIFT));
> @@ -169,6 +194,31 @@ static void rpf_configure_stream(struct vsp1_entity
> *entity,
> 
>  }
> 
> +static void vsp1_rpf_configure_autofld(struct vsp1_rwpf *rpf,
> +				       struct vsp1_dl_ext_cmd *cmd)
> +{
> +	const struct v4l2_pix_format_mplane *format = &rpf->format;
> +	struct vsp1_extcmd_auto_fld_body *auto_fld = cmd->data;
> +	u32 offset_y, offset_c;
> +
> +	/* Re-index our auto_fld to match the current RPF */

s/RPF/RPF./

> +	auto_fld = &auto_fld[rpf->entity.index];
> +
> +	auto_fld->top_y0 = rpf->mem.addr[0];
> +	auto_fld->top_c0 = rpf->mem.addr[1];
> +	auto_fld->top_c1 = rpf->mem.addr[2];
> +
> +	offset_y = format->plane_fmt[0].bytesperline;
> +	offset_c = format->plane_fmt[1].bytesperline;
> +
> +	auto_fld->bottom_y0 = rpf->mem.addr[0] + offset_y;
> +	auto_fld->bottom_c0 = rpf->mem.addr[1] + offset_c;
> +	auto_fld->bottom_c1 = rpf->mem.addr[2] + offset_c;
> +
> +	cmd->flags |= VSP1_DL_EXT_AUTOFLD_INT;
> +	cmd->flags |= BIT(16 + rpf->entity.index);

Do you expect some flags to already be set ? If not, couldn't we assign the 
value to the field instead of OR'ing it ?

> +}
> +
>  static void rpf_configure_frame(struct vsp1_entity *entity,
>  				struct vsp1_pipeline *pipe,
>  				struct vsp1_dl_list *dl,
> @@ -192,6 +242,7 @@ static void rpf_configure_partition(struct vsp1_entity
> *entity, struct vsp1_rwpf *rpf = to_rwpf(&entity->subdev);
>  	struct vsp1_rwpf_memory mem = rpf->mem;
>  	struct vsp1_device *vsp1 = rpf->entity.vsp1;
> +	struct vsp1_dl_ext_cmd *cmd;
>  	const struct vsp1_format_info *fmtinfo = rpf->fmtinfo;
>  	const struct v4l2_pix_format_mplane *format = &rpf->format;
>  	struct v4l2_rect crop;
> @@ -220,6 +271,11 @@ static void rpf_configure_partition(struct vsp1_entity
> *entity, crop.left += pipe->partition->rpf.left;
>  	}
> 
> +	if (rpf->interlaced) {
> +		crop.height = round_down(crop.height / 2, fmtinfo->vsub);
> +		crop.top = round_down(crop.top / 2, fmtinfo->vsub);
> +	}
> +
>  	vsp1_rpf_write(rpf, dlb, VI6_RPF_SRC_BSIZE,
>  		       (crop.width << VI6_RPF_SRC_BSIZE_BHSIZE_SHIFT) |
>  		       (crop.height << VI6_RPF_SRC_BSIZE_BVSIZE_SHIFT));
> @@ -248,9 +304,18 @@ static void rpf_configure_partition(struct vsp1_entity
> *entity, fmtinfo->swap_uv)
>  		swap(mem.addr[1], mem.addr[2]);
> 
> -	vsp1_rpf_write(rpf, dlb, VI6_RPF_SRCM_ADDR_Y, mem.addr[0]);
> -	vsp1_rpf_write(rpf, dlb, VI6_RPF_SRCM_ADDR_C0, mem.addr[1]);
> -	vsp1_rpf_write(rpf, dlb, VI6_RPF_SRCM_ADDR_C1, mem.addr[2]);
> +	/*
> +	 * Interlaced pipelines will use the extended pre-cmd to process
> +	 * SRCM_ADDR_{Y,C0,C1}
> +	 */
> +	if (rpf->interlaced) {
> +		cmd = vsp1_dlm_get_autofld_cmd(dl);

How about moving this call to vsp1_rpf_configure_autofld() ?

> +		vsp1_rpf_configure_autofld(rpf, cmd);
> +	} else {
> +		vsp1_rpf_write(rpf, dlb, VI6_RPF_SRCM_ADDR_Y, mem.addr[0]);
> +		vsp1_rpf_write(rpf, dlb, VI6_RPF_SRCM_ADDR_C0, mem.addr[1]);
> +		vsp1_rpf_write(rpf, dlb, VI6_RPF_SRCM_ADDR_C1, mem.addr[2]);
> +	}
>  }
> 
>  static void rpf_partition(struct vsp1_entity *entity,
> diff --git a/drivers/media/platform/vsp1/vsp1_rwpf.h
> b/drivers/media/platform/vsp1/vsp1_rwpf.h index 70742ecf766f..8d6e42f27908
> 100644
> --- a/drivers/media/platform/vsp1/vsp1_rwpf.h
> +++ b/drivers/media/platform/vsp1/vsp1_rwpf.h
> @@ -42,6 +42,7 @@ struct vsp1_rwpf {
>  	struct v4l2_pix_format_mplane format;
>  	const struct vsp1_format_info *fmtinfo;
>  	unsigned int brx_input;
> +	bool interlaced;

Shouldn't this be stored in the pipeline instead ? Interlacing is a property 
of the whole pipeline, not of each input individually.

>  	unsigned int alpha;
> 
> diff --git a/include/media/vsp1.h b/include/media/vsp1.h
> index 678c24de1ac6..c10883f30980 100644
> --- a/include/media/vsp1.h
> +++ b/include/media/vsp1.h
> @@ -50,6 +50,7 @@ int vsp1_du_setup_lif(struct device *dev, unsigned int
> pipe_index,
>   * @dst: destination rectangle on the display (integer coordinates)
>   * @alpha: alpha value (0: fully transparent, 255: fully opaque)
>   * @zpos: Z position of the plane (from 0 to number of planes minus 1)
> + * @interlaced: true for interlaced pipelines
>   */
>  struct vsp1_du_atomic_config {
>  	u32 pixelformat;
> @@ -59,6 +60,7 @@ struct vsp1_du_atomic_config {
>  	struct v4l2_rect dst;
>  	unsigned int alpha;
>  	unsigned int zpos;
> +	bool interlaced;

For the same reason shouldn't the interlaced flag be moved to 
vsp1_du_lif_config ?

>  };
> 
>  /**

-- 
Regards,

Laurent Pinchart