linux-kernel - [PATCH RFC 2/4] drm/vkms: Switch to managed for encoder

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Message-ID: <20240820090930.2869-1-jose.exposito89@gmail.com>
Date: Tue, 20 Aug 2024 11:09:27 +0200
From: José Expósito <jose.exposito89@...il.com>
To: louis.chauvet@...tlin.com
Cc: airlied@...il.com,
	arthurgrillo@...eup.net,
	daniel@...ll.ch,
	dri-devel@...ts.freedesktop.org,
	hamohammed.sa@...il.com,
	jeremie.dautheribes@...tlin.com,
	linux-kernel@...r.kernel.org,
	maarten.lankhorst@...ux.intel.com,
	mairacanal@...eup.net,
	melissa.srw@...il.com,
	miquel.raynal@...tlin.com,
	mripard@...nel.org,
	nicolejadeyee@...gle.com,
	rodrigosiqueiramelo@...il.com,
	seanpaul@...gle.com,
	thomas.petazzoni@...tlin.com,
	tzimmermann@...e.de,
	José Expósito <jose.exposito89@...il.com>
Subject: [PATCH RFC 2/4] drm/vkms: Switch to managed for encoder

> The current VKMS driver uses non-managed function to create encoders. It
> is not an issue yet, but in order to support multiple devices easly,

s/easly/easily

> convert this code to use drm and device managed helpers.
> 
> Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>

Reviewed-by: José Expósito <jose.exposito89@...il.com>

> ---
>  drivers/gpu/drm/vkms/vkms_drv.h    |  1 -
>  drivers/gpu/drm/vkms/vkms_output.c | 21 +++++++++------------
>  2 files changed, 9 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> index cea7b2640c5d..2c9d1f20ce84 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.h
> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> @@ -42,7 +42,6 @@
>   */
>  struct vkms_output {
>  	struct drm_crtc crtc;
> -	struct drm_encoder encoder;
>  	struct drm_writeback_connector wb_connector;
>  	struct hrtimer vblank_hrtimer;
>  	ktime_t period_ns;
> diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
> index 4767838c3a73..cb8507917b5f 100644
> --- a/drivers/gpu/drm/vkms/vkms_output.c
> +++ b/drivers/gpu/drm/vkms/vkms_output.c
> @@ -16,9 +16,7 @@ static const struct drm_connector_funcs vkms_connector_funcs = {
>  	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>  };
>  
> -static const struct drm_encoder_funcs vkms_encoder_funcs = {
> -	.destroy = drm_encoder_cleanup,
> -};
> +static const struct drm_encoder_funcs vkms_encoder_funcs = {};

This struct is not required, drmm_encoder_init() can take a NULL value.

>  
>  static int vkms_conn_get_modes(struct drm_connector *connector)
>  {
> @@ -55,7 +53,7 @@ int vkms_output_init(struct vkms_device *vkmsdev, int possible_crtc_index)
>  	struct vkms_output *output = &vkmsdev->output;
>  	struct drm_device *dev = &vkmsdev->drm;
>  	struct drm_connector *connector;
> -	struct drm_encoder *encoder = &output->encoder;
> +	struct drm_encoder *encoder;
>  	struct drm_crtc *crtc = &output->crtc;
>  	struct vkms_plane *primary, *cursor = NULL;
>  	int ret;
> @@ -103,8 +101,12 @@ int vkms_output_init(struct vkms_device *vkmsdev, int possible_crtc_index)
>  
>  	drm_connector_helper_add(connector, &vkms_conn_helper_funcs);
>  
> -	ret = drm_encoder_init(dev, encoder, &vkms_encoder_funcs,
> -			       DRM_MODE_ENCODER_VIRTUAL, NULL);
> +	encoder = drmm_kzalloc(&vkmsdev->drm, sizeof(*encoder), GFP_KERNEL);

&vkmsdev->drm => dev

> +	if (!encoder)

The same here, we could log this error:
		DRM_ERROR("Failed to allocate encoder\n");

> +		return -ENOMEM;
> +
> +	ret = drmm_encoder_init(dev, encoder, &vkms_encoder_funcs,

vkms_encoder_funcs can be NULL.

> +				DRM_MODE_ENCODER_VIRTUAL, NULL);
>  	if (ret) {
>  		DRM_ERROR("Failed to init encoder\n");
>  		return ret;
> @@ -118,7 +120,7 @@ int vkms_output_init(struct vkms_device *vkmsdev, int possible_crtc_index)
>  	ret = drm_connector_attach_encoder(connector, encoder);
>  	if (ret) {
>  		DRM_ERROR("Failed to attach connector to encoder\n");
> -		goto err_attach;
> +		return ret;
>  	}
>  
>  	if (vkmsdev->config->writeback) {
> @@ -130,9 +132,4 @@ int vkms_output_init(struct vkms_device *vkmsdev, int possible_crtc_index)
>  	drm_mode_config_reset(dev);
>  
>  	return 0;
> -
> -err_attach:
> -	drm_encoder_cleanup(encoder);
> -
> -	return ret;
>  }