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Date: Tue, 8 Aug 2023 14:05:48 +0200
From: Sebastian Wick <sebastian.wick@...hat.com>
To: Jessica Zhang <quic_jesszhan@...cinc.com>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Rob Clark <robdclark@...il.com>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Sean Paul <sean@...rly.run>,
Marijn Suijten <marijn.suijten@...ainline.org>,
quic_abhinavk@...cinc.com, ppaalanen@...il.com,
contact@...rsion.fr, laurent.pinchart@...asonboard.com,
ville.syrjala@...ux.intel.com, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
freedreno@...ts.freedesktop.org,
wayland-devel@...ts.freedesktop.org
Subject: Re: [PATCH RFC v5 01/10] drm: Introduce pixel_source DRM plane property
On Mon, Aug 7, 2023 at 7:52 PM Jessica Zhang <quic_jesszhan@...cinc.com> wrote:
>
>
>
> On 8/4/2023 6:15 AM, Sebastian Wick wrote:
> > On Fri, Jul 28, 2023 at 7:03 PM Jessica Zhang <quic_jesszhan@...cinc.com> wrote:
> >>
> >> Add support for pixel_source property to drm_plane and related
> >> documentation. In addition, force pixel_source to
> >> DRM_PLANE_PIXEL_SOURCE_FB in DRM_IOCTL_MODE_SETPLANE as to not break
> >> legacy userspace.
> >>
> >> This enum property will allow user to specify a pixel source for the
> >> plane. Possible pixel sources will be defined in the
> >> drm_plane_pixel_source enum.
> >>
> >> The current possible pixel sources are DRM_PLANE_PIXEL_SOURCE_NONE and
> >> DRM_PLANE_PIXEL_SOURCE_FB with *_PIXEL_SOURCE_FB being the default value.
> >>
> >> Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
> >> ---
> >> drivers/gpu/drm/drm_atomic_state_helper.c | 1 +
> >> drivers/gpu/drm/drm_atomic_uapi.c | 4 ++
> >> drivers/gpu/drm/drm_blend.c | 85 +++++++++++++++++++++++++++++++
> >> drivers/gpu/drm/drm_plane.c | 3 ++
> >> include/drm/drm_blend.h | 2 +
> >> include/drm/drm_plane.h | 21 ++++++++
> >> 6 files changed, 116 insertions(+)
> >>
> >> diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
> >> index 784e63d70a42..01638c51ce0a 100644
> >> --- a/drivers/gpu/drm/drm_atomic_state_helper.c
> >> +++ b/drivers/gpu/drm/drm_atomic_state_helper.c
> >> @@ -252,6 +252,7 @@ void __drm_atomic_helper_plane_state_reset(struct drm_plane_state *plane_state,
> >>
> >> plane_state->alpha = DRM_BLEND_ALPHA_OPAQUE;
> >> plane_state->pixel_blend_mode = DRM_MODE_BLEND_PREMULTI;
> >> + plane_state->pixel_source = DRM_PLANE_PIXEL_SOURCE_FB;
> >>
> >> if (plane->color_encoding_property) {
> >> if (!drm_object_property_get_default_value(&plane->base,
> >> diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
> >> index d867e7f9f2cd..454f980e16c9 100644
> >> --- a/drivers/gpu/drm/drm_atomic_uapi.c
> >> +++ b/drivers/gpu/drm/drm_atomic_uapi.c
> >> @@ -544,6 +544,8 @@ static int drm_atomic_plane_set_property(struct drm_plane *plane,
> >> state->src_w = val;
> >> } else if (property == config->prop_src_h) {
> >> state->src_h = val;
> >> + } else if (property == plane->pixel_source_property) {
> >> + state->pixel_source = val;
> >> } else if (property == plane->alpha_property) {
> >> state->alpha = val;
> >> } else if (property == plane->blend_mode_property) {
> >> @@ -616,6 +618,8 @@ drm_atomic_plane_get_property(struct drm_plane *plane,
> >> *val = state->src_w;
> >> } else if (property == config->prop_src_h) {
> >> *val = state->src_h;
> >> + } else if (property == plane->pixel_source_property) {
> >> + *val = state->pixel_source;
> >> } else if (property == plane->alpha_property) {
> >> *val = state->alpha;
> >> } else if (property == plane->blend_mode_property) {
> >> diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c
> >> index 6e74de833466..c500310a3d09 100644
> >> --- a/drivers/gpu/drm/drm_blend.c
> >> +++ b/drivers/gpu/drm/drm_blend.c
> >> @@ -185,6 +185,21 @@
> >> * plane does not expose the "alpha" property, then this is
> >> * assumed to be 1.0
> >> *
> >> + * pixel_source:
> >> + * pixel_source is set up with drm_plane_create_pixel_source_property().
> >> + * It is used to toggle the active source of pixel data for the plane.
> >> + * The plane will only display data from the set pixel_source -- any
> >> + * data from other sources will be ignored.
> >> + *
> >> + * Possible values:
> >> + *
> >> + * "NONE":
> >> + * No active pixel source.
> >> + * Committing with a NONE pixel source will disable the plane.
> >> + *
> >> + * "FB":
> >> + * Framebuffer source set by the "FB_ID" property.
> >> + *
> >> * Note that all the property extensions described here apply either to the
> >> * plane or the CRTC (e.g. for the background color, which currently is not
> >> * exposed and assumed to be black).
> >> @@ -615,3 +630,73 @@ int drm_plane_create_blend_mode_property(struct drm_plane *plane,
> >> return 0;
> >> }
> >> EXPORT_SYMBOL(drm_plane_create_blend_mode_property);
> >> +
> >> +/**
> >> + * drm_plane_create_pixel_source_property - create a new pixel source property
> >> + * @plane: DRM plane
> >> + * @extra_sources: Bitmask of additional supported pixel_sources for the driver.
> >> + * DRM_PLANE_PIXEL_SOURCE_FB always be enabled as a supported
> >> + * source.
> >> + *
> >> + * This creates a new property describing the current source of pixel data for the
> >> + * plane. The pixel_source will be initialized as DRM_PLANE_PIXEL_SOURCE_FB by default.
> >> + *
> >> + * Drivers can set a custom default source by overriding the pixel_source value in
> >> + * drm_plane_funcs.reset()
> >> + *
> >> + * The property is exposed to userspace as an enumeration property called
> >> + * "pixel_source" and has the following enumeration values:
> >> + *
> >> + * "NONE":
> >> + * No active pixel source
> >> + *
> >> + * "FB":
> >> + * Framebuffer pixel source
> >> + *
> >> + * Returns:
> >> + * Zero on success, negative errno on failure.
> >> + */
> >> +int drm_plane_create_pixel_source_property(struct drm_plane *plane,
> >> + unsigned long extra_sources)
> >> +{
> >> + struct drm_device *dev = plane->dev;
> >> + struct drm_property *prop;
> >> + static const struct drm_prop_enum_list enum_list[] = {
> >> + { DRM_PLANE_PIXEL_SOURCE_NONE, "NONE" },
> >> + { DRM_PLANE_PIXEL_SOURCE_FB, "FB" },
> >> + };
> >> + static const unsigned int valid_source_mask = BIT(DRM_PLANE_PIXEL_SOURCE_FB);
> >> + int i;
> >> +
> >> + /* FB is supported by default */
> >> + unsigned long supported_sources = extra_sources | BIT(DRM_PLANE_PIXEL_SOURCE_FB);
> >
> > The DRM_PLANE_PIXEL_SOURCE_NONE property should also be enabled by
> > default and in the valid_source_mask.
>
> Hi Sebastian,
>
> Acked.
>
>
> > In a later patch you implement
> > the DRM_PLANE_PIXEL_SOURCE_NONE logic in drm core so everyone gets the
> > enum value for free. Might want to pull that logic into its own patch
> > and move it before this one.
>
> Can you elaborate on this? Are you referring to the "Loosen FB atomic
> checks" patch?
>
> Not sure why it would make sense to loosen the checks before non-FB
> pixel sources are introduced.
Mh, yeah, but just adding the enum value which is not hooked up is not
good either. Both should probably happen in the same patch.
> Thanks,
>
> Jessica Zhang
>
> >
> >> +
> >> + if (WARN_ON(supported_sources & ~valid_source_mask))
> >> + return -EINVAL;
> >> +
> >> + prop = drm_property_create(dev, DRM_MODE_PROP_ENUM | DRM_MODE_PROP_ATOMIC, "pixel_source",
> >> + hweight32(supported_sources));
> >> +
> >> + if (!prop)
> >> + return -ENOMEM;
> >> +
> >> + for (i = 0; i < ARRAY_SIZE(enum_list); i++) {
> >> + int ret;
> >> +
> >> + if (!test_bit(enum_list[i].type, &supported_sources))
> >> + continue;
> >> +
> >> + ret = drm_property_add_enum(prop, enum_list[i].type, enum_list[i].name);
> >> + if (ret) {
> >> + drm_property_destroy(dev, prop);
> >> +
> >> + return ret;
> >> + }
> >> + }
> >> +
> >> + drm_object_attach_property(&plane->base, prop, DRM_PLANE_PIXEL_SOURCE_FB);
> >> + plane->pixel_source_property = prop;
> >> +
> >> + return 0;
> >> +}
> >> +EXPORT_SYMBOL(drm_plane_create_pixel_source_property);
> >> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> >> index 24e7998d1731..f342cf15412b 100644
> >> --- a/drivers/gpu/drm/drm_plane.c
> >> +++ b/drivers/gpu/drm/drm_plane.c
> >> @@ -987,6 +987,9 @@ int drm_mode_setplane(struct drm_device *dev, void *data,
> >> return -ENOENT;
> >> }
> >>
> >> + if (plane->state && plane->state->pixel_source != DRM_PLANE_PIXEL_SOURCE_FB)
> >> + plane->state->pixel_source = DRM_PLANE_PIXEL_SOURCE_FB;
> >> +
> >> if (plane_req->fb_id) {
> >> fb = drm_framebuffer_lookup(dev, file_priv, plane_req->fb_id);
> >> if (!fb) {
> >> diff --git a/include/drm/drm_blend.h b/include/drm/drm_blend.h
> >> index 88bdfec3bd88..122bbfbaae33 100644
> >> --- a/include/drm/drm_blend.h
> >> +++ b/include/drm/drm_blend.h
> >> @@ -58,4 +58,6 @@ int drm_atomic_normalize_zpos(struct drm_device *dev,
> >> struct drm_atomic_state *state);
> >> int drm_plane_create_blend_mode_property(struct drm_plane *plane,
> >> unsigned int supported_modes);
> >> +int drm_plane_create_pixel_source_property(struct drm_plane *plane,
> >> + unsigned long extra_sources);
> >> #endif
> >> diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
> >> index 51291983ea44..89508b4dea4a 100644
> >> --- a/include/drm/drm_plane.h
> >> +++ b/include/drm/drm_plane.h
> >> @@ -40,6 +40,12 @@ enum drm_scaling_filter {
> >> DRM_SCALING_FILTER_NEAREST_NEIGHBOR,
> >> };
> >>
> >> +enum drm_plane_pixel_source {
> >> + DRM_PLANE_PIXEL_SOURCE_NONE,
> >> + DRM_PLANE_PIXEL_SOURCE_FB,
> >> + DRM_PLANE_PIXEL_SOURCE_MAX
> >> +};
> >> +
> >> /**
> >> * struct drm_plane_state - mutable plane state
> >> *
> >> @@ -116,6 +122,14 @@ struct drm_plane_state {
> >> /** @src_h: height of visible portion of plane (in 16.16) */
> >> uint32_t src_h, src_w;
> >>
> >> + /**
> >> + * @pixel_source:
> >> + *
> >> + * Source of pixel information for the plane. See
> >> + * drm_plane_create_pixel_source_property() for more details.
> >> + */
> >> + enum drm_plane_pixel_source pixel_source;
> >> +
> >> /**
> >> * @alpha:
> >> * Opacity of the plane with 0 as completely transparent and 0xffff as
> >> @@ -699,6 +713,13 @@ struct drm_plane {
> >> */
> >> struct drm_plane_state *state;
> >>
> >> + /*
> >> + * @pixel_source_property:
> >> + * Optional pixel_source property for this plane. See
> >> + * drm_plane_create_pixel_source_property().
> >> + */
> >> + struct drm_property *pixel_source_property;
> >> +
> >> /**
> >> * @alpha_property:
> >> * Optional alpha property for this plane. See
> >>
> >> --
> >> 2.41.0
> >>
> >
>
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