From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sam Ravnborg Subject: Re: [PATCH v2 1/4] drm/simple-kms: Add drm_simple_encoder_{init, create}() Date: Thu, 20 Feb 2020 19:50:50 +0100 Message-ID: <20200220185050.GB18993@ravnborg.org> References: <20200218084815.2137-1-tzimmermann@suse.de> <20200218084815.2137-2-tzimmermann@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20200218084815.2137-2-tzimmermann@suse.de> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" To: Thomas Zimmermann Cc: airlied@linux.ie, dri-devel@lists.freedesktop.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, virtualization@lists.linux-foundation.org, noralf@tronnes.org, daniel@ffwll.ch, alexander.deucher@amd.com, spice-devel@lists.freedesktop.org, emil.velikov@collabora.com List-Id: virtualization@lists.linuxfoundation.org Hi Thomas. On Tue, Feb 18, 2020 at 09:48:12AM +0100, Thomas Zimmermann wrote: > This patch makes the internal encoder implementation of the simple > KMS helpers available to drivers. > > These simple-encoder helpers initialize an encoder with an empty > implementation. This covers the requirements of most of the existing > DRM drivers. A call to drm_simple_encoder_create() allocates and > initializes an encoder instance, a call to drm_simple_encoder_init() > initializes a pre-allocated instance. > > v2: > * move simple encoder to KMS helpers > * remove name argument; simplifies implementation > * don't allocate with devm_ interfaces; unsafe with DRM > > Signed-off-by: Thomas Zimmermann > --- > drivers/gpu/drm/drm_simple_kms_helper.c | 83 ++++++++++++++++++++++++- > include/drm/drm_simple_kms_helper.h | 7 +++ > 2 files changed, 87 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c > index 15fb516ae2d8..745c2f34c42b 100644 > --- a/drivers/gpu/drm/drm_simple_kms_helper.c > +++ b/drivers/gpu/drm/drm_simple_kms_helper.c > @@ -26,12 +26,90 @@ > * entity. Some flexibility for code reuse is provided through a separately > * allocated &drm_connector object and supporting optional &drm_bridge > * encoder drivers. > + * > + * Many drivers use an encoder with an empty implementation. Such encoders > + * fulfill the minimum requirements of the display pipeline, but don't add > + * additional functionality. The simple-encoder functions > + * drm_simple_encoder_init() and drm_simple_encoder_create() provide an > + * appropriate implementation. > */ > > -static const struct drm_encoder_funcs drm_simple_kms_encoder_funcs = { > +static const struct drm_encoder_funcs drm_simple_encoder_funcs_cleanup = { > .destroy = drm_encoder_cleanup, > }; > > +/** > + * drm_simple_encoder_init - Initialize a preallocated encoder > + * @dev: drm device > + * @funcs: callbacks for this encoder > + * @encoder_type: user visible type of the encoder > + * > + * Initialises a preallocated encoder that has no further functionality. The > + * encoder will be released automatically. I got confused here. The comment says the encoder is automatically released. But in this case we have a preallocated encoder (maybe embedded in ast_private or something. So the encoder is - as I understnad it - not released. But it is cleaned up as it is also documented in the next sentences. Sorry if I am dense, just returned from some travelling... Sam Settings for possible CRTC and > + * clones are left to their initial values. The encoder will be cleaned up > + * automatically as part of the mode-setting cleanup. > + * > + * Also see drm_simple_encoder_create(). > + * > + * Returns: > + * Zero on success, error code on failure. > + */ > +int drm_simple_encoder_init(struct drm_device *dev, > + struct drm_encoder *encoder, > + int encoder_type) > +{ > + return drm_encoder_init(dev, encoder, > + &drm_simple_encoder_funcs_cleanup, > + encoder_type, NULL); > +} > +EXPORT_SYMBOL(drm_simple_encoder_init); > + > +static void drm_encoder_destroy(struct drm_encoder *encoder) > +{ > + drm_encoder_cleanup(encoder); > + kfree(encoder); > +} > + > +static const struct drm_encoder_funcs drm_simple_encoder_funcs_destroy = { > + .destroy = drm_encoder_destroy, > +}; > + > +/** > + * drm_simple_encoder_create - Allocate and initialize an encoder > + * @dev: drm device > + * @encoder_type: user visible type of the encoder > + * > + * Allocates and initialises an encoder that has no further functionality. The > + * encoder will be destroyed automatically as part of the mode-setting cleanup. > + * > + * See drm_simple_encoder_init() for more information. > + * > + * Returns: > + * The encoder on success, a pointer-encoder error code on failure. > + */ > +struct drm_encoder *drm_simple_encoder_create(struct drm_device *dev, > + int encoder_type) > +{ > + struct drm_encoder *encoder; > + int ret; > + > + encoder = kzalloc(sizeof(*encoder), GFP_KERNEL); > + if (!encoder) > + return ERR_PTR(-ENOMEM); > + ret = drm_encoder_init(dev, encoder, > + &drm_simple_encoder_funcs_destroy, > + encoder_type, NULL); > + if (ret) > + goto err_kfree; > + > + return encoder; > + > +err_kfree: > + kfree(encoder); > + return ERR_PTR(ret); > +} > +EXPORT_SYMBOL(drm_simple_encoder_create); > + > static enum drm_mode_status > drm_simple_kms_crtc_mode_valid(struct drm_crtc *crtc, > const struct drm_display_mode *mode) > @@ -288,8 +366,7 @@ int drm_simple_display_pipe_init(struct drm_device *dev, > return ret; > > encoder->possible_crtcs = drm_crtc_mask(crtc); > - ret = drm_encoder_init(dev, encoder, &drm_simple_kms_encoder_funcs, > - DRM_MODE_ENCODER_NONE, NULL); > + ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_NONE); > if (ret || !connector) > return ret; > > diff --git a/include/drm/drm_simple_kms_helper.h b/include/drm/drm_simple_kms_helper.h > index e253ba7bea9d..54d5066d90c7 100644 > --- a/include/drm/drm_simple_kms_helper.h > +++ b/include/drm/drm_simple_kms_helper.h > @@ -181,4 +181,11 @@ int drm_simple_display_pipe_init(struct drm_device *dev, > const uint64_t *format_modifiers, > struct drm_connector *connector); > > +int drm_simple_encoder_init(struct drm_device *dev, > + struct drm_encoder *encoder, > + int encoder_type); > + > +struct drm_encoder *drm_simple_encoder_create(struct drm_device *dev, > + int encoder_type); > + > #endif /* __LINUX_DRM_SIMPLE_KMS_HELPER_H */ > -- > 2.25.0 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5D3FCC11D0C for ; 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Thu, 20 Feb 2020 19:50:52 +0100 (CET) Date: Thu, 20 Feb 2020 19:50:50 +0100 From: Sam Ravnborg To: Thomas Zimmermann Subject: Re: [PATCH v2 1/4] drm/simple-kms: Add drm_simple_encoder_{init, create}() Message-ID: <20200220185050.GB18993@ravnborg.org> References: <20200218084815.2137-1-tzimmermann@suse.de> <20200218084815.2137-2-tzimmermann@suse.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200218084815.2137-2-tzimmermann@suse.de> User-Agent: Mutt/1.10.1 (2018-07-13) X-CMAE-Score: 0 X-CMAE-Analysis: v=2.3 cv=XpTUx2N9 c=1 sm=1 tr=0 a=UWs3HLbX/2nnQ3s7vZ42gw==:117 a=UWs3HLbX/2nnQ3s7vZ42gw==:17 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=kj9zAlcOel0A:10 a=e5mUnYsNAAAA:8 a=rZJ61xx7pMjLQKeYT08A:9 a=CjuIK1q_8ugA:10 a=Vxmtnl_E_bksehYqCbjh:22 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: airlied@linux.ie, dri-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org, kraxel@redhat.com, alexander.deucher@amd.com, spice-devel@lists.freedesktop.org, emil.velikov@collabora.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Hi Thomas. On Tue, Feb 18, 2020 at 09:48:12AM +0100, Thomas Zimmermann wrote: > This patch makes the internal encoder implementation of the simple > KMS helpers available to drivers. > > These simple-encoder helpers initialize an encoder with an empty > implementation. This covers the requirements of most of the existing > DRM drivers. A call to drm_simple_encoder_create() allocates and > initializes an encoder instance, a call to drm_simple_encoder_init() > initializes a pre-allocated instance. > > v2: > * move simple encoder to KMS helpers > * remove name argument; simplifies implementation > * don't allocate with devm_ interfaces; unsafe with DRM > > Signed-off-by: Thomas Zimmermann > --- > drivers/gpu/drm/drm_simple_kms_helper.c | 83 ++++++++++++++++++++++++- > include/drm/drm_simple_kms_helper.h | 7 +++ > 2 files changed, 87 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c > index 15fb516ae2d8..745c2f34c42b 100644 > --- a/drivers/gpu/drm/drm_simple_kms_helper.c > +++ b/drivers/gpu/drm/drm_simple_kms_helper.c > @@ -26,12 +26,90 @@ > * entity. Some flexibility for code reuse is provided through a separately > * allocated &drm_connector object and supporting optional &drm_bridge > * encoder drivers. > + * > + * Many drivers use an encoder with an empty implementation. Such encoders > + * fulfill the minimum requirements of the display pipeline, but don't add > + * additional functionality. The simple-encoder functions > + * drm_simple_encoder_init() and drm_simple_encoder_create() provide an > + * appropriate implementation. > */ > > -static const struct drm_encoder_funcs drm_simple_kms_encoder_funcs = { > +static const struct drm_encoder_funcs drm_simple_encoder_funcs_cleanup = { > .destroy = drm_encoder_cleanup, > }; > > +/** > + * drm_simple_encoder_init - Initialize a preallocated encoder > + * @dev: drm device > + * @funcs: callbacks for this encoder > + * @encoder_type: user visible type of the encoder > + * > + * Initialises a preallocated encoder that has no further functionality. The > + * encoder will be released automatically. I got confused here. The comment says the encoder is automatically released. But in this case we have a preallocated encoder (maybe embedded in ast_private or something. So the encoder is - as I understnad it - not released. But it is cleaned up as it is also documented in the next sentences. Sorry if I am dense, just returned from some travelling... Sam Settings for possible CRTC and > + * clones are left to their initial values. The encoder will be cleaned up > + * automatically as part of the mode-setting cleanup. > + * > + * Also see drm_simple_encoder_create(). > + * > + * Returns: > + * Zero on success, error code on failure. > + */ > +int drm_simple_encoder_init(struct drm_device *dev, > + struct drm_encoder *encoder, > + int encoder_type) > +{ > + return drm_encoder_init(dev, encoder, > + &drm_simple_encoder_funcs_cleanup, > + encoder_type, NULL); > +} > +EXPORT_SYMBOL(drm_simple_encoder_init); > + > +static void drm_encoder_destroy(struct drm_encoder *encoder) > +{ > + drm_encoder_cleanup(encoder); > + kfree(encoder); > +} > + > +static const struct drm_encoder_funcs drm_simple_encoder_funcs_destroy = { > + .destroy = drm_encoder_destroy, > +}; > + > +/** > + * drm_simple_encoder_create - Allocate and initialize an encoder > + * @dev: drm device > + * @encoder_type: user visible type of the encoder > + * > + * Allocates and initialises an encoder that has no further functionality. The > + * encoder will be destroyed automatically as part of the mode-setting cleanup. > + * > + * See drm_simple_encoder_init() for more information. > + * > + * Returns: > + * The encoder on success, a pointer-encoder error code on failure. > + */ > +struct drm_encoder *drm_simple_encoder_create(struct drm_device *dev, > + int encoder_type) > +{ > + struct drm_encoder *encoder; > + int ret; > + > + encoder = kzalloc(sizeof(*encoder), GFP_KERNEL); > + if (!encoder) > + return ERR_PTR(-ENOMEM); > + ret = drm_encoder_init(dev, encoder, > + &drm_simple_encoder_funcs_destroy, > + encoder_type, NULL); > + if (ret) > + goto err_kfree; > + > + return encoder; > + > +err_kfree: > + kfree(encoder); > + return ERR_PTR(ret); > +} > +EXPORT_SYMBOL(drm_simple_encoder_create); > + > static enum drm_mode_status > drm_simple_kms_crtc_mode_valid(struct drm_crtc *crtc, > const struct drm_display_mode *mode) > @@ -288,8 +366,7 @@ int drm_simple_display_pipe_init(struct drm_device *dev, > return ret; > > encoder->possible_crtcs = drm_crtc_mask(crtc); > - ret = drm_encoder_init(dev, encoder, &drm_simple_kms_encoder_funcs, > - DRM_MODE_ENCODER_NONE, NULL); > + ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_NONE); > if (ret || !connector) > return ret; > > diff --git a/include/drm/drm_simple_kms_helper.h b/include/drm/drm_simple_kms_helper.h > index e253ba7bea9d..54d5066d90c7 100644 > --- a/include/drm/drm_simple_kms_helper.h > +++ b/include/drm/drm_simple_kms_helper.h > @@ -181,4 +181,11 @@ int drm_simple_display_pipe_init(struct drm_device *dev, > const uint64_t *format_modifiers, > struct drm_connector *connector); > > +int drm_simple_encoder_init(struct drm_device *dev, > + struct drm_encoder *encoder, > + int encoder_type); > + > +struct drm_encoder *drm_simple_encoder_create(struct drm_device *dev, > + int encoder_type); > + > #endif /* __LINUX_DRM_SIMPLE_KMS_HELPER_H */ > -- > 2.25.0 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel