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b=Nm32MOLv1o1o6kbJLN1uocVN+cVieCi5JrY/2t4YX99Z6iWDYEJDVy/jepFQpf1JxkPsOOY/Xe9No/ShcUQxKRqUoZP+bu+UuzLo4t5dX1HYwmIcd3TXOmiK2EeRhbVCXJg3ULJpOnvbgR5dQo4NWJC1X871jQdVHdjZaSTWDEw= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from CO6PR12MB5427.namprd12.prod.outlook.com (2603:10b6:5:358::13) by BY5PR12MB4082.namprd12.prod.outlook.com (2603:10b6:a03:212::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9160.17; Mon, 29 Sep 2025 09:48:36 +0000 Received: from CO6PR12MB5427.namprd12.prod.outlook.com ([fe80::9e93:67dd:49ac:bc14]) by CO6PR12MB5427.namprd12.prod.outlook.com ([fe80::9e93:67dd:49ac:bc14%6]) with mapi id 15.20.9160.008; Mon, 29 Sep 2025 09:48:36 +0000 Message-ID: <5e5017ae-b71a-4933-b248-e68d52fab7ff@amd.com> Date: Mon, 29 Sep 2025 05:48:21 -0400 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v2 06/20] drm: Introduce DRM_CLIENT_CAP_POST_BLEND_COLOR_PIPELINE To: =?UTF-8?B?TsOtY29sYXMgRi4gUi4gQS4gUHJhZG8=?= , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Chun-Kuang Hu , Philipp Zabel , Matthias Brugger , AngeloGioacchino Del Regno , Haneen Mohammed , Melissa Wen Cc: Alex Hung , wayland-devel@lists.freedesktop.org, leo.liu@amd.com, ville.syrjala@linux.intel.com, pekka.paalanen@collabora.com, contact@emersion.fr, mwen@igalia.com, jadahl@redhat.com, sebastian.wick@redhat.com, shashank.sharma@amd.com, agoins@nvidia.com, joshua@froggi.es, mdaenzer@redhat.com, aleixpol@kde.org, xaver.hugl@gmail.com, victoria@system76.com, uma.shankar@intel.com, quic_naseer@quicinc.com, quic_cbraga@quicinc.com, quic_abhinavk@quicinc.com, marcan@marcan.st, Liviu.Dudau@arm.com, sashamcintosh@google.com, chaitanya.kumar.borah@intel.com, louis.chauvet@bootlin.com, mcanal@igalia.com, kernel@collabora.com, daniels@collabora.com, leandro.ribeiro@collabora.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Simona Vetter References: <20250917-mtk-post-blend-color-pipeline-v2-0-ac4471b44758@collabora.com> <20250917-mtk-post-blend-color-pipeline-v2-6-ac4471b44758@collabora.com> Content-Language: en-US From: Harry Wentland In-Reply-To: <20250917-mtk-post-blend-color-pipeline-v2-6-ac4471b44758@collabora.com> Content-Type: text/plain; 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R. A. Prado wrote: > Introduce DRM_CLIENT_CAP_POST_BLEND_COLOR_PIPELINE which a DRM client > can set to enable the usage of post-blend color pipelines instead of the > now deprecated CRTC color management properties: "GAMMA_LUT", > "DEGAMMA_LUT" and "CTM". > > Signed-off-by: Nícolas F. R. A. Prado > --- > drivers/gpu/drm/drm_atomic_uapi.c | 15 +++++++++++++++ > drivers/gpu/drm/drm_connector.c | 1 + > drivers/gpu/drm/drm_crtc_internal.h | 1 + > drivers/gpu/drm/drm_ioctl.c | 9 +++++++++ > drivers/gpu/drm/drm_mode_object.c | 9 +++++++++ > include/drm/drm_file.h | 7 +++++++ > include/uapi/drm/drm.h | 19 +++++++++++++++++++ > 7 files changed, 61 insertions(+) > > diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c > index 063c142fd9b656e228cfc660d005a3fbb4640d32..f5125fa3fa28ff2a6ff07fd7cf07d4bdf77ab738 100644 > --- a/drivers/gpu/drm/drm_atomic_uapi.c > +++ b/drivers/gpu/drm/drm_atomic_uapi.c > @@ -452,6 +452,11 @@ static int drm_atomic_crtc_set_property(struct drm_crtc *crtc, > } else if (property == config->prop_vrr_enabled) { > state->vrr_enabled = val; > } else if (property == config->degamma_lut_property) { > + if (file_priv->post_blend_color_pipeline) { > + drm_dbg_atomic(dev, > + "Setting DEGAMMA_LUT CRTC property not permitted with DRM_CLIENT_CAP_POST_BLEND_COLOR_PIPELINE client cap\n"); > + return -EINVAL; > + } > ret = drm_property_replace_blob_from_id(dev, > &state->degamma_lut, > val, > @@ -460,6 +465,11 @@ static int drm_atomic_crtc_set_property(struct drm_crtc *crtc, > state->color_mgmt_changed |= replaced; > return ret; > } else if (property == config->ctm_property) { > + if (file_priv->post_blend_color_pipeline) { > + drm_dbg_atomic(dev, > + "Setting CTM CRTC property not permitted with DRM_CLIENT_CAP_POST_BLEND_COLOR_PIPELINE client cap\n"); > + return -EINVAL; > + } > ret = drm_property_replace_blob_from_id(dev, > &state->ctm, > val, > @@ -468,6 +478,11 @@ static int drm_atomic_crtc_set_property(struct drm_crtc *crtc, > state->color_mgmt_changed |= replaced; > return ret; > } else if (property == config->gamma_lut_property) { > + if (file_priv->post_blend_color_pipeline) { > + drm_dbg_atomic(dev, > + "Setting GAMMA_LUT CRTC property not permitted with DRM_CLIENT_CAP_POST_BLEND_COLOR_PIPELINE client cap\n"); > + return -EINVAL; > + } > ret = drm_property_replace_blob_from_id(dev, > &state->gamma_lut, > val, > diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c > index 4d6dc9ebfdb5bc730b1aff7a184448af7b93f078..f58cfd2131139ff3e613adc4dbb9ddbedf724dc7 100644 > --- a/drivers/gpu/drm/drm_connector.c > +++ b/drivers/gpu/drm/drm_connector.c > @@ -3440,6 +3440,7 @@ int drm_mode_getconnector(struct drm_device *dev, void *data, > */ > ret = drm_mode_object_get_properties(&connector->base, file_priv->atomic, > file_priv->plane_color_pipeline, > + file_priv->post_blend_color_pipeline, > (uint32_t __user *)(unsigned long)(out_resp->props_ptr), > (uint64_t __user *)(unsigned long)(out_resp->prop_values_ptr), > &out_resp->count_props); > diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h > index e3dbdcbfa385b940ec0b5476adde6146fe4afde1..c53f154e5392a10c326c844b7321666275f9ac02 100644 > --- a/drivers/gpu/drm/drm_crtc_internal.h > +++ b/drivers/gpu/drm/drm_crtc_internal.h > @@ -169,6 +169,7 @@ void drm_mode_object_unregister(struct drm_device *dev, > struct drm_mode_object *object); > int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic, > bool plane_color_pipeline, > + bool post_blend_color_pipeline, > uint32_t __user *prop_ptr, > uint64_t __user *prop_values, > uint32_t *arg_count_props); > diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c > index 01592d10e3465ddceddef94bc417f98d3ec12087..ea9600f5392f520a2b42ba7ef363d2f08ce19812 100644 > --- a/drivers/gpu/drm/drm_ioctl.c > +++ b/drivers/gpu/drm/drm_ioctl.c > @@ -383,6 +383,15 @@ drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) > return -EINVAL; > file_priv->plane_color_pipeline = req->value; > break; > + case DRM_CLIENT_CAP_POST_BLEND_COLOR_PIPELINE: > + if (!file_priv->atomic) > + return -EINVAL; > + if (req->value > 1) > + return -EINVAL; > + if (!drm_core_check_feature(dev, DRIVER_POST_BLEND_COLOR_PIPELINE)) > + return -EINVAL; > + file_priv->post_blend_color_pipeline = req->value; > + break; > default: > return -EINVAL; > } > diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c > index b45d501b10c868c6d9b7a5a8760eadbd7b372a6a..5e6c3de9456b997985142a68b9cef57771a58bdc 100644 > --- a/drivers/gpu/drm/drm_mode_object.c > +++ b/drivers/gpu/drm/drm_mode_object.c > @@ -388,6 +388,7 @@ EXPORT_SYMBOL(drm_object_property_get_default_value); > /* helper for getconnector and getproperties ioctls */ > int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic, > bool plane_color_pipeline, > + bool post_blend_color_pipeline, > uint32_t __user *prop_ptr, > uint64_t __user *prop_values, > uint32_t *arg_count_props) > @@ -416,6 +417,13 @@ int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic, > continue; > } > > + if (!post_blend_color_pipeline && obj->type == DRM_MODE_OBJECT_CRTC) { > + struct drm_crtc *crtc = obj_to_crtc(obj); > + > + if (prop == crtc->color_pipeline_property) > + continue; > + } > + > if (*arg_count_props > count) { > ret = __drm_object_property_get_value(obj, prop, &val); > if (ret) > @@ -475,6 +483,7 @@ int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data, > > ret = drm_mode_object_get_properties(obj, file_priv->atomic, > file_priv->plane_color_pipeline, > + file_priv->post_blend_color_pipeline, > (uint32_t __user *)(unsigned long)(arg->props_ptr), > (uint64_t __user *)(unsigned long)(arg->prop_values_ptr), > &arg->count_props); > diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h > index 1a3018e4a537b3341acb50187d47371f6b781b9d..42b9a43baa18079af8ec2ea5b1484b23c497beb0 100644 > --- a/include/drm/drm_file.h > +++ b/include/drm/drm_file.h > @@ -213,6 +213,13 @@ struct drm_file { > */ > bool plane_color_pipeline; > > + /** > + * @post_blend_color_pipeline: > + * > + * True if client understands post-blend color pipelines > + */ > + bool post_blend_color_pipeline; > + > /** > * @was_master: > * > diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h > index c6c53e57958e951204154ce41a69696a6876f0e8..f9ac10b3e4876f71005a87dedefa4aed320566f0 100644 > --- a/include/uapi/drm/drm.h > +++ b/include/uapi/drm/drm.h > @@ -927,6 +927,25 @@ struct drm_get_cap { > */ > #define DRM_CLIENT_CAP_PLANE_COLOR_PIPELINE 7 > > +/** > + * DRM_CLIENT_CAP_POST_BLEND_COLOR_PIPELINE DRM_CLIENT_CAP_CRTC_COLOR_PIPELINE might be better to align terminology between pre- and post-blend pipelines. It would also make it clear that this is about the color pipeline on a drm_crtc (which pretty much by definition means post- blending). Harry > + * > + * If set to 1 the DRM core will allow setting the COLOR_PIPELINE > + * property on a &drm_crtc, as well as drm_colorop properties. > + * > + * Setting of these crtc properties will be rejected when this client > + * cap is set: > + * - GAMMA_LUT > + * - DEGAMMA_LUT > + * - CTM > + * > + * The client must enable &DRM_CLIENT_CAP_ATOMIC first. > + * > + * This client cap can only be set if the driver sets the corresponding driver > + * cap &DRM_CAP_POST_BLEND_COLOR_PIPELINE. > + */ > +#define DRM_CLIENT_CAP_POST_BLEND_COLOR_PIPELINE 8 > + > /* DRM_IOCTL_SET_CLIENT_CAP ioctl argument type */ > struct drm_set_client_cap { > __u64 capability; >