linux-kernel - Re: [PATCH v2 1/6] drm/vkms: Switch to managed for connector

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Message-ID: <20240827-dynamic-acoustic-guillemot-ddde49@houat>
Date: Tue, 27 Aug 2024 15:15:49 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Louis Chauvet <louis.chauvet@...tlin.com>
Cc: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>, 
	Melissa Wen <melissa.srw@...il.com>, Maíra Canal <mairacanal@...eup.net>, 
	Haneen Mohammed <hamohammed.sa@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Thomas Zimmermann <tzimmermann@...e.de>, 
	David Airlie <airlied@...il.com>, dri-devel@...ts.freedesktop.org, arthurgrillo@...eup.net, 
	linux-kernel@...r.kernel.org, jeremie.dautheribes@...tlin.com, miquel.raynal@...tlin.com, 
	thomas.petazzoni@...tlin.com, seanpaul@...gle.com, nicolejadeyee@...gle.com
Subject: Re: [PATCH v2 1/6] drm/vkms: Switch to managed for connector

Hi,

On Tue, Aug 27, 2024 at 11:57:36AM GMT, Louis Chauvet wrote:
> The current VKMS driver uses non-managed function to create connectors. It
> is not an issue yet, but in order to support multiple devices easily,
> convert this code to use drm and device managed helpers.
> 
> Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
> ---
>  drivers/gpu/drm/vkms/vkms_drv.h    |  1 -
>  drivers/gpu/drm/vkms/vkms_output.c | 22 ++++++++++++----------
>  2 files changed, 12 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> index 5e46ea5b96dc..9a3c6c34d1f6 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.h
> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> @@ -99,7 +99,6 @@ struct vkms_crtc_state {
>  struct vkms_output {
>  	struct drm_crtc crtc;
>  	struct drm_encoder encoder;
> -	struct drm_connector connector;
>  	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 5ce70dd946aa..4fe6b88e8081 100644
> --- a/drivers/gpu/drm/vkms/vkms_output.c
> +++ b/drivers/gpu/drm/vkms/vkms_output.c
> @@ -3,11 +3,11 @@
>  #include "vkms_drv.h"
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_edid.h>
> +#include <drm/drm_managed.h>
>  #include <drm/drm_probe_helper.h>
>  
>  static const struct drm_connector_funcs vkms_connector_funcs = {
>  	.fill_modes = drm_helper_probe_single_connector_modes,
> -	.destroy = drm_connector_cleanup,
>  	.reset = drm_atomic_helper_connector_reset,
>  	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
>  	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> @@ -50,7 +50,7 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
>  {
>  	struct vkms_output *output = &vkmsdev->output;
>  	struct drm_device *dev = &vkmsdev->drm;
> -	struct drm_connector *connector = &output->connector;
> +	struct drm_connector *connector;
>  	struct drm_encoder *encoder = &output->encoder;
>  	struct drm_crtc *crtc = &output->crtc;
>  	struct vkms_plane *primary, *cursor = NULL;
> @@ -80,8 +80,15 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
>  	if (ret)
>  		return ret;
>  
> -	ret = drm_connector_init(dev, connector, &vkms_connector_funcs,
> -				 DRM_MODE_CONNECTOR_VIRTUAL);
> +	connector = drmm_kzalloc(dev, sizeof(*connector), GFP_KERNEL);
> +	if (!connector) {
> +		DRM_ERROR("Failed to allocate connector\n");
> +		ret = -ENOMEM;
> +		goto err_connector;
> +	}
> +

I think it would be worth explaining why you need to move to a separate
allocation for the connector now.

Maxime

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