Hi Laurent,
Thanks for the patch,
On 16/08/17 00:03, Laurent Pinchart wrote:
> Unlike the KMS API, the hardware doesn't support planes exceeding the
> screen boundaries. Clip plane coordinates to support the use case.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/rcar-du/rcar_du_plane.c | 66 +++++++++++++++++++++++++--------
> drivers/gpu/drm/rcar-du/rcar_du_plane.h | 4 ++
> drivers/gpu/drm/rcar-du/rcar_du_vsp.c | 21 +++++++----
> 3 files changed, 67 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_plane.c b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
> index 714e02960635..7944790bac25 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_plane.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
> @@ -19,6 +19,7 @@
> #include <drm/drm_fb_cma_helper.h>
> #include <drm/drm_gem_cma_helper.h>
> #include <drm/drm_plane_helper.h>
> +#include <drm/drm_rect.h>
>
> #include "rcar_du_drv.h"
> #include "rcar_du_group.h"
> @@ -329,11 +330,39 @@ static void rcar_du_plane_write(struct rcar_du_group *rgrp,
> data);
> }
>
> +void rcar_du_plane_clip(const struct drm_plane_state *state,
> + struct drm_rect *src, struct drm_rect *dst)
> +{
> + const struct drm_display_mode *mode;
> +
> + /*
> + * The hardware requires all planes to be fully contained in the output
> + * rectangle. Crop the destination rectangle to fit in the CRTC.
> + */
> + mode = &state->crtc->state->adjusted_mode;
> +
> + dst->x1 = max(0, state->crtc_x);
> + dst->y1 = max(0, state->crtc_y);
> + dst->x2 = min_t(unsigned int, mode->hdisplay,
> + state->crtc_x + state->crtc_w);
> + dst->y2 = min_t(unsigned int, mode->vdisplay,
> + state->crtc_y + state->crtc_h);
> +
> + /*
> + * Offset the left and top source coordinates by the same displacement
> + * we have applied to the destination rectangle. Copy the width and
> + * height as the hardware can't scale.
> + */
> + src->x1 = (state->src_x >> 16) + (dst->x1 - state->crtc_x);
> + src->y1 = (state->src_y >> 16) + (dst->y1 - state->crtc_y);
I had to look up why we do a >> 16 here. I guess this is for sub-pixel
positioning. That might be obvious to DRM developers, but was new to me.
Probably not worth a comment though - as I know what it is now :)
Do we have any macros to make this 16.16 -> int conversion more explicit?
(I think this comes under the same category as using BIT() to which we differ on
opinion anyway though)
> + src->x2 = src->x1 + (dst->x2 - dst->x1);
> + src->y2 = src->y1 + (dst->y2 - dst->y1);
> +}
> +
> static void rcar_du_plane_setup_scanout(struct rcar_du_group *rgrp,
> - const struct rcar_du_plane_state *state)
> + const struct rcar_du_plane_state *state,
> + const struct drm_rect *src)
> {
> - unsigned int src_x = state->state.src_x >> 16;
> - unsigned int src_y = state->state.src_y >> 16;
> unsigned int index = state->hwindex;
> unsigned int pitch;
> bool interlaced;
> @@ -357,7 +386,7 @@ static void rcar_du_plane_setup_scanout(struct rcar_du_group *rgrp,
> dma[i] = gem->paddr + fb->offsets[i];
> }
> } else {
> - pitch = state->state.src_w >> 16;
> + pitch = drm_rect_width(&state->state.src);
> dma[0] = 0;
> dma[1] = 0;
> }
> @@ -383,8 +412,8 @@ static void rcar_du_plane_setup_scanout(struct rcar_du_group *rgrp,
> * require a halved Y position value, in both progressive and interlaced
> * modes.
> */
> - rcar_du_plane_write(rgrp, index, PnSPXR, src_x);
> - rcar_du_plane_write(rgrp, index, PnSPYR, src_y *
> + rcar_du_plane_write(rgrp, index, PnSPXR, src->x1);
> + rcar_du_plane_write(rgrp, index, PnSPYR, src->y1 *
> (!interlaced && state->format->bpp == 32 ? 2 : 1));
>
> rcar_du_plane_write(rgrp, index, PnDSA0R, dma[0]);
> @@ -394,8 +423,8 @@ static void rcar_du_plane_setup_scanout(struct rcar_du_group *rgrp,
>
> rcar_du_plane_write(rgrp, index, PnMWR, pitch);
>
> - rcar_du_plane_write(rgrp, index, PnSPXR, src_x);
> - rcar_du_plane_write(rgrp, index, PnSPYR, src_y *
> + rcar_du_plane_write(rgrp, index, PnSPXR, src->x1);
> + rcar_du_plane_write(rgrp, index, PnSPYR, src->y1 *
> (state->format->bpp == 16 ? 2 : 1) / 2);
>
> rcar_du_plane_write(rgrp, index, PnDSA0R, dma[1]);
> @@ -518,7 +547,8 @@ static void rcar_du_plane_setup_format_gen3(struct rcar_du_group *rgrp,
>
> static void rcar_du_plane_setup_format(struct rcar_du_group *rgrp,
> unsigned int index,
> - const struct rcar_du_plane_state *state)
> + const struct rcar_du_plane_state *state,
> + const struct drm_rect *dst)
> {
> struct rcar_du_device *rcdu = rgrp->dev;
>
> @@ -528,10 +558,10 @@ static void rcar_du_plane_setup_format(struct rcar_du_group *rgrp,
> rcar_du_plane_setup_format_gen3(rgrp, index, state);
>
> /* Destination position and size */
> - rcar_du_plane_write(rgrp, index, PnDSXR, state->state.crtc_w);
> - rcar_du_plane_write(rgrp, index, PnDSYR, state->state.crtc_h);
> - rcar_du_plane_write(rgrp, index, PnDPXR, state->state.crtc_x);
> - rcar_du_plane_write(rgrp, index, PnDPYR, state->state.crtc_y);
> + rcar_du_plane_write(rgrp, index, PnDSXR, drm_rect_width(dst));
> + rcar_du_plane_write(rgrp, index, PnDSYR, drm_rect_height(dst));
> + rcar_du_plane_write(rgrp, index, PnDPXR, dst->x1);
> + rcar_du_plane_write(rgrp, index, PnDPYR, dst->y1);
>
> if (rcdu->info->gen < 3) {
> /* Wrap-around and blinking, disabled */
> @@ -546,14 +576,18 @@ void __rcar_du_plane_setup(struct rcar_du_group *rgrp,
> const struct rcar_du_plane_state *state)
> {
> struct rcar_du_device *rcdu = rgrp->dev;
> + struct drm_rect src;
> + struct drm_rect dst;
> +
> + rcar_du_plane_clip(&state->state, &src, &dst);
>
> - rcar_du_plane_setup_format(rgrp, state->hwindex, state);
> + rcar_du_plane_setup_format(rgrp, state->hwindex, state, &dst);
> if (state->format->planes == 2)
> rcar_du_plane_setup_format(rgrp, (state->hwindex + 1) % 8,
> - state);
> + state, &dst);
>
> if (rcdu->info->gen < 3)
> - rcar_du_plane_setup_scanout(rgrp, state);
> + rcar_du_plane_setup_scanout(rgrp, state, &src);
>
> if (state->source == RCAR_DU_PLANE_VSPD1) {
> unsigned int vspd1_sink = rgrp->index ? 2 : 0;
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_plane.h b/drivers/gpu/drm/rcar-du/rcar_du_plane.h
> index 890321b4665d..ec52a2af7cd4 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_plane.h
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_plane.h
> @@ -17,6 +17,7 @@
> #include <drm/drmP.h>
> #include <drm/drm_crtc.h>
>
> +struct drm_rect;
> struct rcar_du_format_info;
> struct rcar_du_group;
>
> @@ -79,6 +80,9 @@ int __rcar_du_plane_atomic_check(struct drm_plane *plane,
>
> int rcar_du_planes_init(struct rcar_du_group *rgrp);
>
> +void rcar_du_plane_clip(const struct drm_plane_state *state,
> + struct drm_rect *src, struct drm_rect *dst);
> +
> void __rcar_du_plane_setup(struct rcar_du_group *rgrp,
> const struct rcar_du_plane_state *state);
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
> index dd66dcb8da23..e62a8d7ee0c5 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_vsp.c
> @@ -18,6 +18,7 @@
> #include <drm/drm_fb_cma_helper.h>
> #include <drm/drm_gem_cma_helper.h>
> #include <drm/drm_plane_helper.h>
> +#include <drm/drm_rect.h>
>
> #include <linux/bitops.h>
> #include <linux/dma-mapping.h>
> @@ -176,17 +177,21 @@ static void rcar_du_vsp_plane_setup(struct rcar_du_vsp_plane *plane)
> .alpha = state->alpha,
> .zpos = state->state.zpos,
> };
> + struct drm_rect src;
> + struct drm_rect dst;
> unsigned int i;
>
> - cfg.src.left = state->state.src_x >> 16;
> - cfg.src.top = state->state.src_y >> 16;
> - cfg.src.width = state->state.src_w >> 16;
> - cfg.src.height = state->state.src_h >> 16;
> + rcar_du_plane_clip(&state->state, &src, &dst);
>
> - cfg.dst.left = state->state.crtc_x;
> - cfg.dst.top = state->state.crtc_y;
> - cfg.dst.width = state->state.crtc_w;
> - cfg.dst.height = state->state.crtc_h;
> + cfg.src.left = src.x1;
> + cfg.src.top = src.y1;
> + cfg.src.width = drm_rect_width(&src);
> + cfg.src.height = drm_rect_height(&src);
> +
> + cfg.dst.left = dst.x1;
> + cfg.dst.top = dst.y1;
> + cfg.dst.width = drm_rect_width(&dst);
> + cfg.dst.height = drm_rect_height(&dst);
>
> for (i = 0; i < state->format->planes; ++i)
> cfg.mem[i] = sg_dma_address(state->sg_tables[i].sgl)
>
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