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Message-ID: <20190415075922.GA24596@james-ThinkStation-P300>
Date: Mon, 15 Apr 2019 07:59:30 +0000
From: "james qian wang (Arm Technology China)" <james.qian.wang@....com>
To: Ben Davis <Ben.Davis@....com>
CC: "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"airlied@...ux.ie" <airlied@...ux.ie>,
Liviu Dudau <Liviu.Dudau@....com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"maxime.ripard@...tlin.com" <maxime.ripard@...tlin.com>,
nd <nd@....com>, "sean@...rly.run" <sean@...rly.run>
Subject: Re: [v2,1/2] drm: Add writeback_w,h properties
On Fri, Apr 12, 2019 at 02:08:28PM +0000, Ben Davis wrote:
> Add new properties to specify width and height for writeback.
>
> Signed-off-by: Ben Davis <ben.davis@....com>
> ---
> drivers/gpu/drm/drm_atomic_uapi.c | 8 ++++++++
> drivers/gpu/drm/drm_writeback.c | 28 ++++++++++++++++++++++++++++
> include/drm/drm_connector.h | 4 ++++
> include/drm/drm_mode_config.h | 10 ++++++++++
> 4 files changed, 50 insertions(+)
>
> --
> 2.7.4
>
> diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
> index d520a04..1f68dce 100644
> --- a/drivers/gpu/drm/drm_atomic_uapi.c
> +++ b/drivers/gpu/drm/drm_atomic_uapi.c
> @@ -765,6 +765,10 @@ static int drm_atomic_connector_set_property(struct drm_connector *connector,
> return -EINVAL;
> }
> state->content_protection = val;
> + } else if (property == config->prop_writeback_w) {
> + state->writeback_w = val;
> + } else if (property == config->prop_writeback_h) {
> + state->writeback_h = val;
> } else if (property == config->writeback_fb_id_property) {
> struct drm_framebuffer *fb = drm_framebuffer_lookup(dev, NULL, val);
> int ret = drm_atomic_set_writeback_fb_for_connector(state, fb);
> @@ -837,6 +841,10 @@ drm_atomic_connector_get_property(struct drm_connector *connector,
> *val = state->scaling_mode;
> } else if (property == connector->content_protection_property) {
> *val = state->content_protection;
> + } else if (property == config->prop_writeback_w) {
> + *val = state->writeback_w;
> + } else if (property == config->prop_writeback_h) {
> + *val = state->writeback_h;
> } else if (property == config->writeback_fb_id_property) {
> /* Writeback framebuffer is one-shot, write and forget */
> *val = 0;
> diff --git a/drivers/gpu/drm/drm_writeback.c b/drivers/gpu/drm/drm_writeback.c
> index c20e6fe..3d0453e 100644
> --- a/drivers/gpu/drm/drm_writeback.c
> +++ b/drivers/gpu/drm/drm_writeback.c
> @@ -74,6 +74,12 @@
> * applications making use of writeback connectors *always* retrieve an
> * out-fence for the commit and use it appropriately.
> * From userspace, this property will always read as zero.
> + *
> + * "WRITEBACK_W":
> + * The width of the writeback buffer to write back. 0 acts as default.
> + *
> + * "WRITEBACK_H":
> + * The height of the writeback buffer to write back. 0 acts as default.
> */
>
> #define fence_to_wb_connector(x) container_of(x->lock, \
> @@ -141,6 +147,22 @@ static int create_writeback_properties(struct drm_device *dev)
> dev->mode_config.writeback_out_fence_ptr_property = prop;
> }
>
> + if (!dev->mode_config.prop_writeback_w) {
> + prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
> + "WRITEBACK_W", 1, UINT_MAX);
> + if (!prop)
> + return -ENOMEM;
> + dev->mode_config.prop_writeback_w = prop;
> + }
> +
> + if (!dev->mode_config.prop_writeback_h) {
> + prop = drm_property_create_range(dev, DRM_MODE_PROP_ATOMIC,
> + "WRITEBACK_H", 1, UINT_MAX);
> + if (!prop)
> + return -ENOMEM;
> + dev->mode_config.prop_writeback_h = prop;
> + }
> +
> return 0;
> }
>
> @@ -225,6 +247,12 @@ int drm_writeback_connector_init(struct drm_device *dev,
> drm_object_attach_property(&connector->base,
> config->writeback_pixel_formats_property,
> blob->base.id);
> +
> + drm_object_attach_property(&connector->base,
> + config->prop_writeback_w, 0);
> + drm_object_attach_property(&connector->base,
> + config->prop_writeback_h, 0);
Hi Ben:
Do we real need these two individual properties for specifing the writeback
w/h, can we use fb->w/h ?
And since these two properties are added as common and standard properties,
it influnce all existing write-back implementation which all assumed
writeback size as fb->w/h.
To compatible with existing writeback support, I suggest to keep to
use fb->w/h or add these properties as malidp private.
Thanks
James
> wb_connector->pixel_formats_blob_ptr = blob;
>
> return 0;
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 8fe22ab..51c4cb2 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -515,6 +515,10 @@ struct drm_connector_state {
> */
> struct drm_writeback_job *writeback_job;
>
> + /** @writeback_w: width of plane to write to wb buffer */
> + /** @writeback_h: height of plane to write to wb buffer */
> + uint32_t writeback_w, writeback_h;
> +
> /**
> * @max_requested_bpc: Connector property to limit the maximum bit
> * depth of the pixels.
> diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
> index 7f60e8e..a0c2133 100644
> --- a/include/drm/drm_mode_config.h
> +++ b/include/drm/drm_mode_config.h
> @@ -622,6 +622,16 @@ struct drm_mode_config {
> */
> struct drm_property *prop_crtc_h;
> /**
> + * @prop_writeback_w: Writeback connector property for the plane
> + * destination position in the writeback buffer.
> + */
> + struct drm_property *prop_writeback_w;
> + /**
> + * @prop_writeback_h: Writeback connector property for the plane
> + * destination position in the writeback buffer.
> + */
> + struct drm_property *prop_writeback_h;
> + /**
> * @prop_fb_id: Default atomic plane property to specify the
> * &drm_framebuffer.
> */
Pls del this window style line ending
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