[PATCH v2 2/3] drm/tegra: plane: Implement zPos plane property for older Tegra's

Older Tegra's do not support planes z position handling in hardware, but HW provides knobs for zPos implementation in software.

Signed-off-by: Dmitry Osipenko digetx@gmail.com --- drivers/gpu/drm/tegra/dc.c | 134 ++++++++++++++++------- drivers/gpu/drm/tegra/plane.c | 193 ++++++++++++++++++++++++---------- drivers/gpu/drm/tegra/plane.h | 13 ++- 3 files changed, 244 insertions(+), 96 deletions(-)

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c index 79aac38f4ed2..be624ac700a8 100644 --- a/drivers/gpu/drm/tegra/dc.c +++ b/drivers/gpu/drm/tegra/dc.c @@ -162,29 +162,90 @@ static void tegra_plane_setup_blending_legacy(struct tegra_plane *plane) u32 foreground = BLEND_WEIGHT1(255) | BLEND_WEIGHT0(255) | BLEND_COLOR_KEY_NONE; u32 blendnokey = BLEND_WEIGHT1(255) | BLEND_WEIGHT0(255); + u32 blending[2]; struct tegra_plane_state *state; unsigned int i;

+ /* disable blending for non-overlapping case */ + tegra_plane_writel(plane, blendnokey, DC_WIN_BLEND_NOKEY); + tegra_plane_writel(plane, foreground, DC_WIN_BLEND_1WIN); + state = to_tegra_plane_state(plane->base.state);

- /* alpha contribution is 1 minus sum of overlapping windows */ - for (i = 0; i < 3; i++) { - if (state->dependent[i]) - background[i] |= BLEND_CONTROL_DEPENDENT; - } + if (state->opaque) { + /* + * Since custom fix-weight blending isn't utilized and weight + * of top window is set to max, we can enforce dependent + * blending which in this case results in transparent bottom + * window if top window is opaque and if top window enables + * alpha blending, then bottom window is getting alpha value + * of 1 minus the sum of alpha components of the overlapping + * plane. + */ + background[0] |= BLEND_CONTROL_DEPENDENT; + background[1] |= BLEND_CONTROL_DEPENDENT;

- /* enable alpha blending if pixel format has an alpha component */ - if (!state->opaque) + /* + * The region where three windows overlap is the intersection + * of the two regions where two windows overlap. It contributes + * to the area if all of the windows on top of it have an alpha + * component. + */ + switch (state->base.normalized_zpos) { + case 0: + if (state->blending[0].alpha && + state->blending[1].alpha) + background[2] |= BLEND_CONTROL_DEPENDENT; + break; + + case 1: + background[2] |= BLEND_CONTROL_DEPENDENT; + break; + } + } else { + /* + * Enable alpha blending if pixel format has an alpha + * component. + */ foreground |= BLEND_CONTROL_ALPHA;

- /* - * Disable blending and assume Window A is the bottom-most window, - * Window C is the top-most window and Window B is in the middle. - */ - tegra_plane_writel(plane, blendnokey, DC_WIN_BLEND_NOKEY); - tegra_plane_writel(plane, foreground, DC_WIN_BLEND_1WIN); + /* + * If any of the windows on top of this window is opaque, it + * will completely conceal this window within that area. If + * top window has an alpha component, it is blended over the + * bottom window. + */ + for (i = 0; i < 2; i++) { + if (state->blending[i].alpha && + state->blending[i].top) + background[i] |= BLEND_CONTROL_DEPENDENT; + } + + switch (state->base.normalized_zpos) { + case 0: + if (state->blending[0].alpha && + state->blending[1].alpha) + background[2] |= BLEND_CONTROL_DEPENDENT; + break; + + case 1: + /* + * When both middle and topmost windows have an alpha, + * these windows a mixed together and then the result + * is blended over the bottom window. + */ + if (state->blending[0].alpha && + state->blending[0].top) + background[2] |= BLEND_CONTROL_ALPHA;

- switch (plane->index) { + if (state->blending[1].alpha && + state->blending[1].top) + background[2] |= BLEND_CONTROL_ALPHA; + break; + } + } + + switch (state->base.normalized_zpos) { case 0: tegra_plane_writel(plane, background[0], DC_WIN_BLEND_2WIN_X); tegra_plane_writel(plane, background[1], DC_WIN_BLEND_2WIN_Y); @@ -192,8 +253,21 @@ static void tegra_plane_setup_blending_legacy(struct tegra_plane *plane) break;

case 1: - tegra_plane_writel(plane, foreground, DC_WIN_BLEND_2WIN_X); - tegra_plane_writel(plane, background[1], DC_WIN_BLEND_2WIN_Y); + /* + * If window B / C is topmost, then X / Y registers are + * matching the order of blending[...] state indices, + * otherwise a swap is required. + */ + if (!state->blending[0].top && state->blending[1].top) { + blending[0] = foreground; + blending[1] = background[1]; + } else { + blending[0] = background[0]; + blending[1] = foreground; + } + + tegra_plane_writel(plane, blending[0], DC_WIN_BLEND_2WIN_X); + tegra_plane_writel(plane, blending[1], DC_WIN_BLEND_2WIN_Y); tegra_plane_writel(plane, background[2], DC_WIN_BLEND_3WIN_XY); break;

@@ -525,14 +599,14 @@ static int tegra_plane_atomic_check(struct drm_plane *plane, struct tegra_bo_tiling *tiling = &plane_state->tiling; struct tegra_plane *tegra = to_tegra_plane(plane); struct tegra_dc *dc = to_tegra_dc(state->crtc); - unsigned int format; int err;

/* no need for further checks if the plane is being disabled */ if (!state->crtc) return 0;

- err = tegra_plane_format(state->fb->format->format, &format, + err = tegra_plane_format(state->fb->format->format, + &plane_state->format, &plane_state->swap); if (err < 0) return err; @@ -544,21 +618,11 @@ static int tegra_plane_atomic_check(struct drm_plane *plane, * be emulated by disabling alpha blending for the plane. */ if (!dc->soc->supports_blending) { - if (!tegra_plane_format_has_alpha(format)) { - err = tegra_plane_format_get_alpha(format, &format); - if (err < 0) - return err; - - plane_state->opaque = true; - } else { - plane_state->opaque = false; - } - - tegra_plane_check_dependent(tegra, plane_state); + err = tegra_plane_setup_legacy_state(tegra, plane_state); + if (err < 0) + return err; }

- plane_state->format = format; - err = tegra_fb_get_tiling(state->fb, tiling); if (err < 0) return err; @@ -710,9 +774,7 @@ static struct drm_plane *tegra_primary_plane_create(struct drm_device *drm, }

drm_plane_helper_add(&plane->base, &tegra_plane_helper_funcs); - - if (dc->soc->supports_blending) - drm_plane_create_zpos_property(&plane->base, 0, 0, 255); + drm_plane_create_zpos_property(&plane->base, plane->index, 0, 255);

return &plane->base; } @@ -989,9 +1051,7 @@ static struct drm_plane *tegra_dc_overlay_plane_create(struct drm_device *drm, }

drm_plane_helper_add(&plane->base, &tegra_plane_helper_funcs); - - if (dc->soc->supports_blending) - drm_plane_create_zpos_property(&plane->base, 0, 0, 255); + drm_plane_create_zpos_property(&plane->base, plane->index, 0, 255);

return &plane->base; } diff --git a/drivers/gpu/drm/tegra/plane.c b/drivers/gpu/drm/tegra/plane.c index 176ef46c615c..0406c2ef432c 100644 --- a/drivers/gpu/drm/tegra/plane.c +++ b/drivers/gpu/drm/tegra/plane.c @@ -23,6 +23,7 @@ static void tegra_plane_destroy(struct drm_plane *plane)

static void tegra_plane_reset(struct drm_plane *plane) { + struct tegra_plane *p = to_tegra_plane(plane); struct tegra_plane_state *state;

if (plane->state) @@ -35,6 +36,8 @@ static void tegra_plane_reset(struct drm_plane *plane) if (state) { plane->state = &state->base; plane->state->plane = plane; + plane->state->zpos = p->index; + plane->state->normalized_zpos = p->index; } }

@@ -55,8 +58,8 @@ tegra_plane_atomic_duplicate_state(struct drm_plane *plane) copy->swap = state->swap; copy->opaque = state->opaque;

- for (i = 0; i < 3; i++) - copy->dependent[i] = state->dependent[i]; + for (i = 0; i < 2; i++) + copy->blending[i] = state->blending[i];

return &copy->base; } @@ -267,24 +270,8 @@ static bool __drm_format_has_alpha(u32 format) return false; }

-/* - * This is applicable to Tegra20 and Tegra30 only where the opaque formats can - * be emulated using the alpha formats and alpha blending disabled. - */ -bool tegra_plane_format_has_alpha(unsigned int format) -{ - switch (format) { - case WIN_COLOR_DEPTH_B5G5R5A1: - case WIN_COLOR_DEPTH_A1B5G5R5: - case WIN_COLOR_DEPTH_R8G8B8A8: - case WIN_COLOR_DEPTH_B8G8R8A8: - return true; - } - - return false; -} - -int tegra_plane_format_get_alpha(unsigned int opaque, unsigned int *alpha) +static int tegra_plane_format_get_alpha(unsigned int opaque, + unsigned int *alpha) { if (tegra_plane_format_is_yuv(opaque, NULL)) { *alpha = opaque; @@ -316,6 +303,67 @@ int tegra_plane_format_get_alpha(unsigned int opaque, unsigned int *alpha) return -EINVAL; }

+/* + * This is applicable to Tegra20 and Tegra30 only where the opaque formats can + * be emulated using the alpha formats and alpha blending disabled. + */ +static int tegra_plane_setup_opacity(struct tegra_plane *tegra, + struct tegra_plane_state *state) +{ + unsigned int format; + int err; + + switch (state->format) { + case WIN_COLOR_DEPTH_B5G5R5A1: + case WIN_COLOR_DEPTH_A1B5G5R5: + case WIN_COLOR_DEPTH_R8G8B8A8: + case WIN_COLOR_DEPTH_B8G8R8A8: + state->opaque = false; + break; + + default: + err = tegra_plane_format_get_alpha(state->format, &format); + if (err < 0) + return err; + + state->format = format; + state->opaque = true; + break; + } + + return 0; +} + +static int tegra_plane_check_transparency(struct tegra_plane *tegra, + struct tegra_plane_state *state) +{ + struct drm_plane_state *old, *plane_state; + struct drm_plane *plane; + + old = drm_atomic_get_old_plane_state(state->base.state, &tegra->base); + + /* check if zpos / transparency changed */ + if (old->normalized_zpos == state->base.normalized_zpos && + to_tegra_plane_state(old)->opaque == state->opaque) + return 0; + + /* include all sibling planes into this commit */ + drm_for_each_plane(plane, tegra->base.dev) { + struct tegra_plane *p = to_tegra_plane(plane); + + /* skip this plane and planes on different CRTCs */ + if (p == tegra || p->dc != tegra->dc) + continue; + + plane_state = drm_atomic_get_plane_state(state->base.state, + plane); + if (IS_ERR(plane_state)) + return PTR_ERR(plane_state); + } + + return 1; +} + static unsigned int tegra_plane_get_overlap_index(struct tegra_plane *plane, struct tegra_plane *other) { @@ -336,61 +384,98 @@ static unsigned int tegra_plane_get_overlap_index(struct tegra_plane *plane, return index; }

-void tegra_plane_check_dependent(struct tegra_plane *tegra, - struct tegra_plane_state *state) +static void tegra_plane_update_transparency(struct tegra_plane *tegra, + struct tegra_plane_state *state) { - struct drm_plane_state *old, *new; + struct drm_plane_state *new; struct drm_plane *plane; - unsigned int zpos[2]; unsigned int i;

- for (i = 0; i < 2; i++) - zpos[i] = 0; - - for_each_oldnew_plane_in_state(state->base.state, plane, old, new, i) { + for_each_new_plane_in_state(state->base.state, plane, new, i) { struct tegra_plane *p = to_tegra_plane(plane); unsigned index;

/* skip this plane and planes on different CRTCs */ - if (p == tegra || new->crtc != state->base.crtc) + if (p == tegra || p->dc != tegra->dc) continue;

index = tegra_plane_get_overlap_index(tegra, p);

- state->dependent[index] = false; + if (new->fb && __drm_format_has_alpha(new->fb->format->format)) + state->blending[index].alpha = true; + else + state->blending[index].alpha = false; + + if (new->normalized_zpos > state->base.normalized_zpos) + state->blending[index].top = true; + else + state->blending[index].top = false;

/* - * If any of the other planes is on top of this plane and uses - * a format with an alpha component, mark this plane as being - * dependent, meaning it's alpha value will be 1 minus the sum - * of alpha components of the overlapping planes. + * Missing framebuffer means that plane is disabled, in this + * case mark B / C window as top to be able to differentiate + * windows indices order in regards to zPos for the middle + * window X / Y registers programming. */ - if (p->index > tegra->index) { - if (__drm_format_has_alpha(new->fb->format->format)) - state->dependent[index] = true; - - /* keep track of the Z position */ - zpos[index] = p->index; - } + if (!new->fb) + state->blending[index].top = (index == 1); } +} + +static int tegra_plane_setup_transparency(struct tegra_plane *tegra, + struct tegra_plane_state *state) +{ + struct tegra_plane_state *tegra_state; + struct drm_plane_state *new; + struct drm_plane *plane; + int err;

/* - * The region where three windows overlap is the intersection of the - * two regions where two windows overlap. It contributes to the area - * if any of the windows on top of it have an alpha component. + * If planes zpos / transparency changed, sibling planes blending + * state may require adjustment and in this case they will be included + * into this atom commit, otherwise blending state is unchanged. */ - for (i = 0; i < 2; i++) - state->dependent[2] = state->dependent[2] || - state->dependent[i]; + err = tegra_plane_check_transparency(tegra, state); + if (err <= 0) + return err;

/* - * However, if any of the windows on top of this window is opaque, it - * will completely conceal this window within that area, so avoid the - * window from contributing to the area. + * All planes are now in the atomic state, walk them up and update + * transparency state for each plane. */ - for (i = 0; i < 2; i++) { - if (zpos[i] > tegra->index) - state->dependent[2] = state->dependent[2] && - state->dependent[i]; + drm_for_each_plane(plane, tegra->base.dev) { + struct tegra_plane *p = to_tegra_plane(plane); + + /* skip planes on different CRTCs */ + if (p->dc != tegra->dc) + continue; + + new = drm_atomic_get_new_plane_state(state->base.state, plane); + tegra_state = to_tegra_plane_state(new); + + /* + * There is no need to update blending state for the disabled + * plane. + */ + if (new->fb) + tegra_plane_update_transparency(p, tegra_state); } + + return 0; +} + +int tegra_plane_setup_legacy_state(struct tegra_plane *tegra, + struct tegra_plane_state *state) +{ + int err; + + err = tegra_plane_setup_opacity(tegra, state); + if (err < 0) + return err; + + err = tegra_plane_setup_transparency(tegra, state); + if (err < 0) + return err; + + return 0; } diff --git a/drivers/gpu/drm/tegra/plane.h b/drivers/gpu/drm/tegra/plane.h index 6938719e7e5d..7360ddfafee8 100644 --- a/drivers/gpu/drm/tegra/plane.h +++ b/drivers/gpu/drm/tegra/plane.h @@ -34,6 +34,11 @@ static inline struct tegra_plane *to_tegra_plane(struct drm_plane *plane) return container_of(plane, struct tegra_plane, base); }

+struct tegra_plane_legacy_blending_state { + bool alpha; + bool top; +}; + struct tegra_plane_state { struct drm_plane_state base;

@@ -42,8 +47,8 @@ struct tegra_plane_state { u32 swap;

/* used for legacy blending support only */ + struct tegra_plane_legacy_blending_state blending[2]; bool opaque; - bool dependent[3]; };

static inline struct tegra_plane_state * @@ -62,9 +67,7 @@ int tegra_plane_state_add(struct tegra_plane *plane,

int tegra_plane_format(u32 fourcc, u32 *format, u32 *swap); bool tegra_plane_format_is_yuv(unsigned int format, bool *planar); -bool tegra_plane_format_has_alpha(unsigned int format); -int tegra_plane_format_get_alpha(unsigned int opaque, unsigned int *alpha); -void tegra_plane_check_dependent(struct tegra_plane *tegra, - struct tegra_plane_state *state); +int tegra_plane_setup_legacy_state(struct tegra_plane *tegra, + struct tegra_plane_state *state);

#endif /* TEGRA_PLANE_H */