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Date: Fri, 19 Mar 2021 16:36:35 -0400
From: Harry Wentland <harry.wentland@....com>
To: Maxime Ripard <maxime@...no.tech>, dri-devel@...ts.freedesktop.org,
Daniel Vetter <daniel.vetter@...el.com>,
David Airlie <airlied@...ux.ie>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Thomas Zimmermann <tzimmermann@...e.de>
Cc: Jernej Skrabec <jernej.skrabec@...l.net>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Dave Stevenson <dave.stevenson@...pberrypi.com>,
Phil Elwell <phil@...pberrypi.com>,
Tim Gover <tim.gover@...pberrypi.com>,
Dom Cobley <dom@...pberrypi.com>,
Christian König <christian.koenig@....com>,
Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org, Jonas Karlman <jonas@...boo.se>,
linux-kernel@...r.kernel.org, Maxime Ripard <mripard@...nel.org>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Alex Deucher <alexander.deucher@....com>,
Neil Armstrong <narmstrong@...libre.com>,
Eric Anholt <eric@...olt.net>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Andrzej Hajda <a.hajda@...sung.com>,
Leo Li <sunpeng.li@....com>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH 2/3] drm/connector: Add helper to compare HDR metadata
On 2021-03-19 8:49 a.m., Maxime Ripard wrote:
> All the drivers that support the HDR metadata property have a similar
> function to compare the metadata from one connector state to the next,
> and force a mode change if they differ.
>
> All these functions run pretty much the same code, so let's turn it into
> an helper that can be shared across those drivers.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
Patches 1 & 2 are
Reviewed-by: Harry Wentland <harry.wentland@....com>
Harry
> ---
> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 21 +-------------
> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 17 +----------
> drivers/gpu/drm/drm_connector.c | 28 +++++++++++++++++++
> drivers/gpu/drm/i915/display/intel_atomic.c | 13 +--------
> include/drm/drm_connector.h | 2 ++
> 5 files changed, 33 insertions(+), 48 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 06908a3cee0f..4eb5201e566a 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -5924,25 +5924,6 @@ static int fill_hdr_info_packet(const struct drm_connector_state *state,
> return 0;
> }
>
> -static bool
> -is_hdr_metadata_different(const struct drm_connector_state *old_state,
> - const struct drm_connector_state *new_state)
> -{
> - struct drm_property_blob *old_blob = old_state->hdr_output_metadata;
> - struct drm_property_blob *new_blob = new_state->hdr_output_metadata;
> -
> - if (old_blob != new_blob) {
> - if (old_blob && new_blob &&
> - old_blob->length == new_blob->length)
> - return memcmp(old_blob->data, new_blob->data,
> - old_blob->length);
> -
> - return true;
> - }
> -
> - return false;
> -}
> -
> static int
> amdgpu_dm_connector_atomic_check(struct drm_connector *conn,
> struct drm_atomic_state *state)
> @@ -5960,7 +5941,7 @@ amdgpu_dm_connector_atomic_check(struct drm_connector *conn,
> if (!crtc)
> return 0;
>
> - if (is_hdr_metadata_different(old_con_state, new_con_state)) {
> + if (!drm_connector_atomic_hdr_metadata_equal(old_con_state, new_con_state)) {
> struct dc_info_packet hdr_infopacket;
>
> ret = fill_hdr_info_packet(new_con_state, &hdr_infopacket);
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index f24bbb840dbf..f871e33c2fc9 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -2395,21 +2395,6 @@ static int dw_hdmi_connector_get_modes(struct drm_connector *connector)
> return ret;
> }
>
> -static bool hdr_metadata_equal(const struct drm_connector_state *old_state,
> - const struct drm_connector_state *new_state)
> -{
> - struct drm_property_blob *old_blob = old_state->hdr_output_metadata;
> - struct drm_property_blob *new_blob = new_state->hdr_output_metadata;
> -
> - if (!old_blob || !new_blob)
> - return old_blob == new_blob;
> -
> - if (old_blob->length != new_blob->length)
> - return false;
> -
> - return !memcmp(old_blob->data, new_blob->data, old_blob->length);
> -}
> -
> static int dw_hdmi_connector_atomic_check(struct drm_connector *connector,
> struct drm_atomic_state *state)
> {
> @@ -2423,7 +2408,7 @@ static int dw_hdmi_connector_atomic_check(struct drm_connector *connector,
> if (!crtc)
> return 0;
>
> - if (!hdr_metadata_equal(old_state, new_state)) {
> + if (!drm_connector_atomic_hdr_metadata_equal(old_state, new_state)) {
> crtc_state = drm_atomic_get_crtc_state(state, crtc);
> if (IS_ERR(crtc_state))
> return PTR_ERR(crtc_state);
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index e25248e23e18..d781a3a1e9bf 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -2170,6 +2170,34 @@ int drm_connector_attach_hdr_output_metadata_property(struct drm_connector *conn
> }
> EXPORT_SYMBOL(drm_connector_attach_hdr_output_metadata_property);
>
> +/**
> + * drm_connector_atomic_hdr_metadata_equal - checks if the hdr metadata changed
> + * @old_state: old connector state to compare
> + * @new_state: new connector state to compare
> + *
> + * This is used by HDR-enabled drivers to test whether the HDR metadata
> + * have changed between two different connector state (and thus probably
> + * requires a full blown mode change).
> + *
> + * Returns:
> + * True if the metadata are equal, False otherwise
> + */
> +bool drm_connector_atomic_hdr_metadata_equal(struct drm_connector_state *old_state,
> + struct drm_connector_state *new_state)
> +{
> + struct drm_property_blob *old_blob = old_state->hdr_output_metadata;
> + struct drm_property_blob *new_blob = new_state->hdr_output_metadata;
> +
> + if (!old_blob || !new_blob)
> + return old_blob == new_blob;
> +
> + if (old_blob->length != new_blob->length)
> + return false;
> +
> + return !memcmp(old_blob->data, new_blob->data, old_blob->length);
> +}
> +EXPORT_SYMBOL(drm_connector_atomic_hdr_metadata_equal);
> +
> /**
> * drm_connector_set_vrr_capable_property - sets the variable refresh rate
> * capable property for a connector
> diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
> index e00fdc47c0eb..efec9454af5a 100644
> --- a/drivers/gpu/drm/i915/display/intel_atomic.c
> +++ b/drivers/gpu/drm/i915/display/intel_atomic.c
> @@ -109,16 +109,6 @@ int intel_digital_connector_atomic_set_property(struct drm_connector *connector,
> return -EINVAL;
> }
>
> -static bool blob_equal(const struct drm_property_blob *a,
> - const struct drm_property_blob *b)
> -{
> - if (a && b)
> - return a->length == b->length &&
> - !memcmp(a->data, b->data, a->length);
> -
> - return !a == !b;
> -}
> -
> int intel_digital_connector_atomic_check(struct drm_connector *conn,
> struct drm_atomic_state *state)
> {
> @@ -149,8 +139,7 @@ int intel_digital_connector_atomic_check(struct drm_connector *conn,
> new_conn_state->base.picture_aspect_ratio != old_conn_state->base.picture_aspect_ratio ||
> new_conn_state->base.content_type != old_conn_state->base.content_type ||
> new_conn_state->base.scaling_mode != old_conn_state->base.scaling_mode ||
> - !blob_equal(new_conn_state->base.hdr_output_metadata,
> - old_conn_state->base.hdr_output_metadata))
> + !drm_connector_atomic_hdr_metadata_equal(old_state, new_state))
> crtc_state->mode_changed = true;
>
> return 0;
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 32172dab8427..1f51d73ca715 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -1672,6 +1672,8 @@ int drm_connector_attach_scaling_mode_property(struct drm_connector *connector,
> int drm_connector_attach_vrr_capable_property(
> struct drm_connector *connector);
> int drm_connector_attach_hdr_output_metadata_property(struct drm_connector *connector);
> +bool drm_connector_atomic_hdr_metadata_equal(struct drm_connector_state *old_state,
> + struct drm_connector_state *new_state);
> int drm_mode_create_aspect_ratio_property(struct drm_device *dev);
> int drm_mode_create_hdmi_colorspace_property(struct drm_connector *connector);
> int drm_mode_create_dp_colorspace_property(struct drm_connector *connector);
>
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