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

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Message-Id: <20240814-google-vkms-managed-v1-2-7ab8b8921103@bootlin.com>
Date: Wed, 14 Aug 2024 12:06:35 +0200
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: 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>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>
Cc: 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, 
 Louis Chauvet <louis.chauvet@...tlin.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,
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 | 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 = {};
 
 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);
+	if (!encoder)
+		return -ENOMEM;
+
+	ret = drmm_encoder_init(dev, encoder, &vkms_encoder_funcs,
+				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;
 }

-- 
2.44.2