[RFC PATCH v3 1/3] drm: Introduce solid fill property for drm plane
Harry Wentland
harry.wentland at amd.com
Thu Jan 19 15:57:14 UTC 2023
On 1/18/23 17:53, Jessica Zhang wrote:
>
>
> On 1/18/2023 10:57 AM, Harry Wentland wrote:
>> On 1/4/23 18:40, Jessica Zhang wrote:
>>> Add support for solid_fill property to drm_plane. In addition, add
>>> support for setting and getting the values for solid_fill.
>>>
>>> solid_fill holds data for supporting solid fill planes. The property
>>> accepts an RGB323232 value and the driver data is formatted as such:
>>>
>>> struct drm_solid_fill {
>>> u32 r;
>>> u32 g;
>>> u32 b;
>>> };
>>
>> Rather than special-casing this would it make sense to define this
>> as a single pixel of a FOURCC property?
>>
>> I.e., something like this:
>>
>> struct drm_solid_fill_info {
>> u32 format; /* FOURCC value */
>> u64 value; /* FOURCC pixel value */
>> }
>>
>> That removes some ambiguity how the value should be interpreted, i.e.,
>> it can be interpreted like a single pixel of the specified FOURCC format.
>>
>> It might also make sense to let drivers advertise the supported
>> FOURCC formats for solid_fill planes.
>
> Hi Harry,
>
> The initial v1 of this RFC had support for taking in a format and such, but it was decided that just supporting RGB323232 would work too.
>
> Here's the original thread discussing it [1], but to summarize, the work needed to convert the solid fill color to RGB is trivial (as it's just a single pixel of data). In addition, supporting various formats for solid_fill would add complexity as we'd have to communicate which formats are supported.
>
> [1] https://lists.freedesktop.org/archives/dri-devel/2022-November/379148.html
>
Make sense, and thanks for summarizing.
The only comment I would have left then, is that maybe it'd be good to add
an alpha value. I think it was suggested by someone else as well.
>>
>> Is there an implementation for this in a corresponding canonical
>> upstream userspace project, to satisfy [1]? If not, what is the plan
>> for this? If so, please point to the corresponding patches.
>
> The use case we're trying to support here is the Android HWC SOLID_FILL hint [1], though it can also be used to address the Wayland single pixel FB protocol [2]. I'm also planning to add an IGT test to show an example of end to end usage.
>
> [1] https://android.googlesource.com/platform/hardware/interfaces/+/refs/heads/master/graphics/composer/aidl/android/hardware/graphics/composer3/Composition.aidl#52
>
> [2] https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/104
>
Makes sense.
Harry
> Thanks,
>
> Jessica Zhang
>
>>
>> [1] https://dri.freedesktop.org/docs/drm/gpu/drm-uapi.html#open-source-userspace-requirements
>>
>> Harry
>>
>>>
>>> To enable solid fill planes, userspace must assigned solid_fill to a
>>> property blob containing the following information:
>>>
>>> struct drm_solid_fill_info {
>>> u8 version;
>>> u32 r, g, b;
>>> };
>>>
>>> Changes in V2:
>>> - Changed solid_fill property to a property blob (Simon, Dmitry)
>>> - Added drm_solid_fill struct (Simon)
>>> - Added drm_solid_fill_info struct (Simon)
>>>
>>> Changes in V3:
>>> - Corrected typo in drm_solid_fill struct documentation
>>>
>>> Signed-off-by: Jessica Zhang <quic_jesszhan at quicinc.com>
>>> ---
>>> drivers/gpu/drm/drm_atomic_state_helper.c | 9 ++++
>>> drivers/gpu/drm/drm_atomic_uapi.c | 59 +++++++++++++++++++++++
>>> drivers/gpu/drm/drm_blend.c | 17 +++++++
>>> include/drm/drm_blend.h | 1 +
>>> include/drm/drm_plane.h | 43 +++++++++++++++++
>>> 5 files changed, 129 insertions(+)
>>>
>>> diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
>>> index dfb57217253b..c96fd1f2ad99 100644
>>> --- a/drivers/gpu/drm/drm_atomic_state_helper.c
>>> +++ b/drivers/gpu/drm/drm_atomic_state_helper.c
>>> @@ -253,6 +253,11 @@ 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;
>>> + if (plane_state->solid_fill_blob) {
>>> + drm_property_blob_put(plane_state->solid_fill_blob);
>>> + plane_state->solid_fill_blob = NULL;
>>> + }
>>> +
>>> if (plane->color_encoding_property) {
>>> if (!drm_object_property_get_default_value(&plane->base,
>>> plane->color_encoding_property,
>>> @@ -335,6 +340,9 @@ void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
>>> if (state->fb)
>>> drm_framebuffer_get(state->fb);
>>> + if (state->solid_fill_blob)
>>> + drm_property_blob_get(state->solid_fill_blob);
>>> +
>>> state->fence = NULL;
>>> state->commit = NULL;
>>> state->fb_damage_clips = NULL;
>>> @@ -384,6 +392,7 @@ void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state)
>>> drm_crtc_commit_put(state->commit);
>>> drm_property_blob_put(state->fb_damage_clips);
>>> + drm_property_blob_put(state->solid_fill_blob);
>>> }
>>> EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);
>>> diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
>>> index c06d0639d552..8a1d2fb7a757 100644
>>> --- a/drivers/gpu/drm/drm_atomic_uapi.c
>>> +++ b/drivers/gpu/drm/drm_atomic_uapi.c
>>> @@ -316,6 +316,55 @@ drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
>>> }
>>> EXPORT_SYMBOL(drm_atomic_set_crtc_for_connector);
>>> +static void drm_atomic_convert_solid_fill_info(struct drm_solid_fill *out,
>>> + struct drm_solid_fill_info *in)
>>> +{
>>> + out->r = in->r;
>>> + out->g = in->g;
>>> + out->b = in->b;
>>> +}
>>> +
>>> +static int drm_atomic_set_solid_fill_prop(struct drm_plane_state *state,
>>> + struct drm_property_blob *blob)
>>> +{
>>> + int ret = 0;
>>> + int blob_version;
>>> +
>>> + if (blob == state->solid_fill_blob)
>>> + return 0;
>>> +
>>> + drm_property_blob_put(state->solid_fill_blob);
>>> + state->solid_fill_blob = NULL;
>>> +
>>> + memset(&state->solid_fill, 0, sizeof(state->solid_fill));
>>> +
>>> + if (blob) {
>>> + if (blob->length != sizeof(struct drm_solid_fill_info)) {
>>> + drm_dbg_atomic(state->plane->dev,
>>> + "[PLANE:%d:%s] bad solid fill blob length: %zu\n",
>>> + state->plane->base.id, state->plane->name,
>>> + blob->length);
>>> + return -EINVAL;
>>> + }
>>> +
>>> + blob_version = ((struct drm_solid_fill_info *)blob->data)->version;
>>> +
>>> + /* Append with more versions if necessary */
>>> + if (blob_version == 1) {
>>> + drm_atomic_convert_solid_fill_info(&state->solid_fill, blob->data);
>>> + } else {
>>> + drm_dbg_atomic(state->plane->dev,
>>> + "[PLANE:%d:%s] failed to set solid fill (ret=%d)\n",
>>> + state->plane->base.id, state->plane->name,
>>> + ret);
>>> + return -EINVAL;
>>> + }
>>> + state->solid_fill_blob = drm_property_blob_get(blob);
>>> + }
>>> +
>>> + return ret;
>>> +}
>>> +
>>> static void set_out_fence_for_crtc(struct drm_atomic_state *state,
>>> struct drm_crtc *crtc, s32 __user *fence_ptr)
>>> {
>>> @@ -544,6 +593,13 @@ 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->solid_fill_property) {
>>> + struct drm_property_blob *solid_fill = drm_property_lookup_blob(dev, val);
>>> +
>>> + ret = drm_atomic_set_solid_fill_prop(state, solid_fill);
>>> + drm_property_blob_put(solid_fill);
>>> +
>>> + return ret;
>>> } else if (property == plane->alpha_property) {
>>> state->alpha = val;
>>> } else if (property == plane->blend_mode_property) {
>>> @@ -616,6 +672,9 @@ 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->solid_fill_property) {
>>> + *val = state->solid_fill_blob ?
>>> + state->solid_fill_blob->base.id : 0;
>>> } 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 b4c8cab7158c..17ab645c8309 100644
>>> --- a/drivers/gpu/drm/drm_blend.c
>>> +++ b/drivers/gpu/drm/drm_blend.c
>>> @@ -616,3 +616,20 @@ int drm_plane_create_blend_mode_property(struct drm_plane *plane,
>>> return 0;
>>> }
>>> EXPORT_SYMBOL(drm_plane_create_blend_mode_property);
>>> +
>>> +int drm_plane_create_solid_fill_property(struct drm_plane *plane)
>>> +{
>>> + struct drm_property *prop;
>>> +
>>> + prop = drm_property_create(plane->dev,
>>> + DRM_MODE_PROP_ATOMIC | DRM_MODE_PROP_BLOB,
>>> + "solid_fill", 0);
>>> + if (!prop)
>>> + return -ENOMEM;
>>> +
>>> + drm_object_attach_property(&plane->base, prop, 0);
>>> + plane->solid_fill_property = prop;
>>> +
>>> + return 0;
>>> +}
>>> +EXPORT_SYMBOL(drm_plane_create_solid_fill_property);
>>> diff --git a/include/drm/drm_blend.h b/include/drm/drm_blend.h
>>> index 88bdfec3bd88..0338a860b9c8 100644
>>> --- a/include/drm/drm_blend.h
>>> +++ b/include/drm/drm_blend.h
>>> @@ -58,4 +58,5 @@ 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_solid_fill_property(struct drm_plane *plane);
>>> #endif
>>> diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
>>> index 447e664e49d5..3b9da06f358b 100644
>>> --- a/include/drm/drm_plane.h
>>> +++ b/include/drm/drm_plane.h
>>> @@ -40,6 +40,25 @@ enum drm_scaling_filter {
>>> DRM_SCALING_FILTER_NEAREST_NEIGHBOR,
>>> };
>>> +/**
>>> + * struct drm_solid_fill_info - User info for solid fill planes
>>> + */
>>> +struct drm_solid_fill_info {
>>> + __u8 version;
>>> + __u32 r, g, b;
>>> +};
>>> +
>>> +/**
>>> + * struct solid_fill_property - RGB values for solid fill plane
>>> + *
>>> + * Note: This is the V1 for this feature
>>> + */
>>> +struct drm_solid_fill {
>>> + uint32_t r;
>>> + uint32_t g;
>>> + uint32_t b;
>>> +};
>>> +
>>> /**
>>> * struct drm_plane_state - mutable plane state
>>> *
>>> @@ -116,6 +135,23 @@ struct drm_plane_state {
>>> /** @src_h: height of visible portion of plane (in 16.16) */
>>> uint32_t src_h, src_w;
>>> + /**
>>> + * @solid_fill_blob:
>>> + *
>>> + * Blob containing relevant information for a solid fill plane
>>> + * including pixel format and data. See
>>> + * drm_plane_create_solid_fill_property() for more details.
>>> + */
>>> + struct drm_property_blob *solid_fill_blob;
>>> +
>>> + /**
>>> + * @solid_fill:
>>> + *
>>> + * Pixel data for solid fill planes. See
>>> + * drm_plane_create_solid_fill_property() for more details.
>>> + */
>>> + struct drm_solid_fill solid_fill;
>>> +
>>> /**
>>> * @alpha:
>>> * Opacity of the plane with 0 as completely transparent and 0xffff as
>>> @@ -699,6 +735,13 @@ struct drm_plane {
>>> */
>>> struct drm_plane_state *state;
>>> + /*
>>> + * @solid_fill_property:
>>> + * Optional solid_fill property for this plane. See
>>> + * drm_plane_create_solid_fill_property().
>>> + */
>>> + struct drm_property *solid_fill_property;
>>> +
>>> /**
>>> * @alpha_property:
>>> * Optional alpha property for this plane. See
>>
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