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Message-Id: <20240814-google-clarifications-v1-3-3ee76d7d0c28@bootlin.com>
Date: Wed, 14 Aug 2024 10:47:00 +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, marcheu@...gle.com, nicolejadeyee@...gle.com,
Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH 3/3] drm/vkms: Add documentation
Add documentation around vkms_output and its initialization.
Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
drivers/gpu/drm/vkms/vkms_drv.h | 81 ++++++++++++++++++++++++++++++++------
drivers/gpu/drm/vkms/vkms_output.c | 12 +++++-
2 files changed, 80 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
index 3028678e4f9b..8f6c9e67e671 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -147,29 +147,51 @@ struct vkms_color_lut {
};
/**
- * vkms_crtc_state - Driver specific CRTC state
+ * struct vkms_crtc_state - Driver specific CRTC state
+ *
* @base: base CRTC state
* @composer_work: work struct to compose and add CRC entries
- * @n_frame_start: start frame number for computed CRC
- * @n_frame_end: end frame number for computed CRC
+ *
+ * @num_active_planes: Number of active planes
+ * @active_planes: List containing all the active planes (counted by
+ * @num_active_planes). They should be stored in z-order.
+ * @active_writeback: Current active writeback job
+ * @gamma_lut: Look up table for gamma used in this CRTC
+ * @crc_pending: Protected by @vkms_output.composer_lock.
+ * @wb_pending: Protected by @vkms_output.composer_lock.
+ * @frame_start: Protected by @vkms_output.composer_lock.
+ * @frame_end: Protected by @vkms_output.composer_lock.
*/
struct vkms_crtc_state {
struct drm_crtc_state base;
struct work_struct composer_work;
int num_active_planes;
- /* stack of active planes for crc computation, should be in z order */
struct vkms_plane_state **active_planes;
struct vkms_writeback_job *active_writeback;
struct vkms_color_lut gamma_lut;
- /* below four are protected by vkms_output.composer_lock */
bool crc_pending;
bool wb_pending;
u64 frame_start;
u64 frame_end;
};
+/**
+ * struct vkms_output - Internal representation of all output components in vkms
+ *
+ * @crtc: Base crtc in drm
+ * @encoder: DRM encoder used for this output
+ * @connector: DRM connector used for this output
+ * @wb_connecter: DRM writeback connector used for this output
+ * @vblank_hrtimer:
+ * @period_ns:
+ * @composer_workq: Ordered workqueue for composer_work
+ * @lock: Lock used to project concurrent acces to the composer
+ * @composer_enabled: Protected by @lock.
+ * @composer_state:
+ * @composer_lock: Lock used internally to protect @composer_state members
+ */
struct vkms_output {
struct drm_crtc crtc;
struct drm_encoder encoder;
@@ -177,28 +199,38 @@ struct vkms_output {
struct drm_writeback_connector wb_connector;
struct hrtimer vblank_hrtimer;
ktime_t period_ns;
- /* ordered wq for composer_work */
struct workqueue_struct *composer_workq;
- /* protects concurrent access to composer */
spinlock_t lock;
- /* protected by @lock */
bool composer_enabled;
struct vkms_crtc_state *composer_state;
spinlock_t composer_lock;
};
-struct vkms_device;
-
+/**
+ * struct vkms_config - General configuration for VKMS driver
+ *
+ * @writeback: If true, a writeback buffer can be attached to the CRTC
+ * @cursor: If true, a cursor plane is created in the VKMS device
+ * @overlay: If true, NUM_OVERLAY_PLANES will be created for the VKMS device
+ * @dev: Used to store the current vkms device. Only set when the device is instancied.
+ */
struct vkms_config {
bool writeback;
bool cursor;
bool overlay;
- /* only set when instantiated */
struct vkms_device *dev;
};
+/**
+ * struct vkms_device - Description of a vkms device
+ *
+ * @drm - Base device in drm
+ * @platform - Associated platform device
+ * @output - Configuration and sub-components of the vkms device
+ * @config: Configuration used in this vkms device
+ */
struct vkms_device {
struct drm_device drm;
struct platform_device *platform;
@@ -206,6 +238,10 @@ struct vkms_device {
const struct vkms_config *config;
};
+/*
+ * The following helpers are used to convert a member of a struct into its parent.
+ */
+
#define drm_crtc_to_vkms_output(target) \
container_of(target, struct vkms_output, crtc)
@@ -218,12 +254,33 @@ struct vkms_device {
#define to_vkms_plane_state(target)\
container_of(target, struct vkms_plane_state, base.base)
-/* CRTC */
+/**
+ * vkms_crtc_init() - Initialize a crtc for vkms
+ * @dev: drm_device associated with the vkms buffer
+ * @crtc: uninitialized crtc device
+ * @primary: primary plane to attach to the crtc
+ * @cursor plane to attach to the crtc
+ */
int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
struct drm_plane *primary, struct drm_plane *cursor);
+/**
+ * vkms_output_init() - Initialize all sub-components needed for a vkms device.
+ *
+ * @vkmsdev: vkms device to initialize
+ * @possible_crtc_index: Crtc which can be attached to the planes. The caller must ensure that
+ * possible_crtc_index is positive and less or equals to 31.
+ */
int vkms_output_init(struct vkms_device *vkmsdev, int possible_crtc_index);
+/**
+ * vkms_plane_init() - Initialize a plane
+ *
+ * @vkmsdev: vkms device containing the plane
+ * @type: type of plane to initialize
+ * @possible_crtc_index: Crtc which can be attached to the plane. The caller must ensure that
+ * possible_crtc_index is positive and less or equals to 31.
+ */
struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
enum drm_plane_type type, int possible_crtc_index);
diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
index d42ca7d10389..36db2c8923cb 100644
--- a/drivers/gpu/drm/vkms/vkms_output.c
+++ b/drivers/gpu/drm/vkms/vkms_output.c
@@ -21,6 +21,7 @@ static int vkms_conn_get_modes(struct drm_connector *connector)
{
int count;
+ /* Use the default modes list from drm */
count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
@@ -58,8 +59,13 @@ int vkms_output_init(struct vkms_device *vkmsdev, int possible_crtc_index)
int writeback;
unsigned int n;
+ /*
+ * Initialize used plane. One primary plane is required to perform the composition.
+ *
+ * The overlay and cursor planes are not mandatory, but can be used to perform complex
+ * composition.
+ */
primary = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_PRIMARY, possible_crtc_index);
-
if (IS_ERR(primary))
return PTR_ERR(primary);
@@ -96,6 +102,10 @@ int vkms_output_init(struct vkms_device *vkmsdev, int possible_crtc_index)
DRM_ERROR("Failed to init encoder\n");
goto err_encoder;
}
+ /*
+ * This is an hardcoded value to select crtc for the encoder.
+ * 1 here designate the first registered CRTC, the one allocated in [1]
+ */
encoder->possible_crtcs = 1;
ret = drm_connector_attach_encoder(connector, encoder);
--
2.44.2
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