* [PATCH v3 1/2] drm/fb-cma-helper: Add function drm_fb_cma_create_with_funcs()
2016-05-12 12:53 [PATCH v3 0/2] drm: Add various helpers for simple drivers Noralf Trønnes
@ 2016-05-12 12:53 ` Noralf Trønnes
2016-05-12 13:47 ` Laurent Pinchart
2016-05-12 12:53 ` [PATCH v3 2/2] drm: Add helper for simple display pipeline Noralf Trønnes
1 sibling, 1 reply; 6+ messages in thread
From: Noralf Trønnes @ 2016-05-12 12:53 UTC (permalink / raw)
To: dri-devel; +Cc: daniel, linux-kernel, Noralf Trønnes, laurent.pinchart
Add drm_fb_cma_create_with_funcs() for drivers that need to set the
dirty() callback.
Cc: laurent.pinchart@ideasonboard.com
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
Changes since v1:
- Expand docs
drivers/gpu/drm/drm_fb_cma_helper.c | 31 +++++++++++++++++++++++++------
include/drm/drm_fb_cma_helper.h | 3 +++
2 files changed, 28 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c
index 3165ac0..ede77c9 100644
--- a/drivers/gpu/drm/drm_fb_cma_helper.c
+++ b/drivers/gpu/drm/drm_fb_cma_helper.c
@@ -159,13 +159,17 @@ static struct drm_fb_cma *drm_fb_cma_alloc(struct drm_device *dev,
}
/**
- * drm_fb_cma_create() - (struct drm_mode_config_funcs *)->fb_create callback function
+ * drm_fb_cma_create_with_funcs() - helper function for the
+ * &drm_mode_config_funcs ->fb_create
+ * callback function
*
- * If your hardware has special alignment or pitch requirements these should be
- * checked before calling this function.
+ * This can be used to set &drm_framebuffer_funcs for drivers that need the
+ * dirty() callback. Use drm_fb_cma_create() if you don't need to change
+ * &drm_framebuffer_funcs.
*/
-struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
- struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd)
+struct drm_framebuffer *drm_fb_cma_create_with_funcs(struct drm_device *dev,
+ struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd,
+ struct drm_framebuffer_funcs *funcs)
{
struct drm_fb_cma *fb_cma;
struct drm_gem_cma_object *objs[4];
@@ -202,7 +206,7 @@ struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
objs[i] = to_drm_gem_cma_obj(obj);
}
- fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i, &drm_fb_cma_funcs);
+ fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i, funcs);
if (IS_ERR(fb_cma)) {
ret = PTR_ERR(fb_cma);
goto err_gem_object_unreference;
@@ -215,6 +219,21 @@ err_gem_object_unreference:
drm_gem_object_unreference_unlocked(&objs[i]->base);
return ERR_PTR(ret);
}
+EXPORT_SYMBOL_GPL(drm_fb_cma_create_with_funcs);
+
+/**
+ * drm_fb_cma_create() - &drm_mode_config_funcs ->fb_create callback function
+ *
+ * If your hardware has special alignment or pitch requirements these should be
+ * checked before calling this function. Use drm_fb_cma_create_with_funcs() if
+ * you need to set &drm_framebuffer_funcs ->dirty.
+ */
+struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
+ struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd)
+{
+ return drm_fb_cma_create_with_funcs(dev, file_priv, mode_cmd,
+ &drm_fb_cma_funcs);
+}
EXPORT_SYMBOL_GPL(drm_fb_cma_create);
/**
diff --git a/include/drm/drm_fb_cma_helper.h b/include/drm/drm_fb_cma_helper.h
index c6d9c9c..1f9a8bc 100644
--- a/include/drm/drm_fb_cma_helper.h
+++ b/include/drm/drm_fb_cma_helper.h
@@ -31,6 +31,9 @@ void drm_fb_cma_destroy(struct drm_framebuffer *fb);
int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
struct drm_file *file_priv, unsigned int *handle);
+struct drm_framebuffer *drm_fb_cma_create_with_funcs(struct drm_device *dev,
+ struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd,
+ struct drm_framebuffer_funcs *funcs);
struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd);
--
2.8.2
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v3 2/2] drm: Add helper for simple display pipeline
2016-05-12 12:53 [PATCH v3 0/2] drm: Add various helpers for simple drivers Noralf Trønnes
2016-05-12 12:53 ` [PATCH v3 1/2] drm/fb-cma-helper: Add function drm_fb_cma_create_with_funcs() Noralf Trønnes
@ 2016-05-12 12:53 ` Noralf Trønnes
2016-05-12 15:32 ` Daniel Vetter
1 sibling, 1 reply; 6+ messages in thread
From: Noralf Trønnes @ 2016-05-12 12:53 UTC (permalink / raw)
To: dri-devel; +Cc: daniel, linux-kernel, Noralf Trønnes, jsarha
Provides helper functions for drivers that have a simple display
pipeline. Plane, crtc and encoder are collapsed into one entity.
Cc: jsarha@ti.com
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
Changes since v2:
- Drop Kconfig knob DRM_KMS_HELPER
- Expand documentation
Changes since v1:
- Add DOC header and add to gpu.tmpl
- Fix docs: @funcs is optional, "negative error code",
"This hook is optional."
- Add checks to drm_simple_kms_plane_atomic_check()
Documentation/DocBook/gpu.tmpl | 6 +
drivers/gpu/drm/Makefile | 2 +-
drivers/gpu/drm/drm_simple_kms_helper.c | 209 ++++++++++++++++++++++++++++++++
include/drm/drm_simple_kms_helper.h | 95 +++++++++++++++
4 files changed, 311 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/drm_simple_kms_helper.c
create mode 100644 include/drm/drm_simple_kms_helper.h
diff --git a/Documentation/DocBook/gpu.tmpl b/Documentation/DocBook/gpu.tmpl
index 4a0c599..cf3f5a8 100644
--- a/Documentation/DocBook/gpu.tmpl
+++ b/Documentation/DocBook/gpu.tmpl
@@ -1693,6 +1693,12 @@ void intel_crt_init(struct drm_device *dev)
!Edrivers/gpu/drm/drm_panel.c
!Pdrivers/gpu/drm/drm_panel.c drm panel
</sect2>
+ <sect2>
+ <title>Simple KMS Helper Reference</title>
+!Iinclude/drm/drm_simple_kms_helper.h
+!Edrivers/gpu/drm/drm_simple_kms_helper.c
+!Pdrivers/gpu/drm/drm_simple_kms_helper.c overview
+ </sect2>
</sect1>
<!-- Internals: kms properties -->
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 2bd3e5a..31b85df5 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -23,7 +23,7 @@ drm-$(CONFIG_AGP) += drm_agpsupport.o
drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o \
drm_plane_helper.o drm_dp_mst_topology.o drm_atomic_helper.o \
- drm_kms_helper_common.o
+ drm_kms_helper_common.o drm_simple_kms_helper.o
drm_kms_helper-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
drm_kms_helper-$(CONFIG_DRM_FBDEV_EMULATION) += drm_fb_helper.o
diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
new file mode 100644
index 0000000..74dbada
--- /dev/null
+++ b/drivers/gpu/drm/drm_simple_kms_helper.c
@@ -0,0 +1,209 @@
+/*
+ * Copyright (C) 2016 Noralf Trønnes
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_plane_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+#include <linux/slab.h>
+
+/**
+ * DOC: overview
+ *
+ * This helper library provides helpers for drivers for simple display
+ * hardware.
+ *
+ * drm_simple_display_pipe_init() initializes a simple display pipeline
+ * which has only one full-screen scanout buffer feeding one output. The
+ * pipeline is represented by struct &drm_simple_display_pipe and binds
+ * together &drm_plane, &drm_crtc and &drm_encoder structures into one fixed
+ * entity. Some flexibility for code reuse is provided through a separately
+ * allocated &drm_connector object and supporting optional &drm_bridge
+ * encoder drivers.
+ */
+
+static const struct drm_encoder_funcs drm_simple_kms_encoder_funcs = {
+ .destroy = drm_encoder_cleanup,
+};
+
+static void drm_simple_kms_crtc_enable(struct drm_crtc *crtc)
+{
+ struct drm_simple_display_pipe *pipe;
+
+ pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
+ if (!pipe->funcs || !pipe->funcs->enable)
+ return;
+
+ pipe->funcs->enable(pipe, crtc->state);
+}
+
+static void drm_simple_kms_crtc_disable(struct drm_crtc *crtc)
+{
+ struct drm_simple_display_pipe *pipe;
+
+ pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
+ if (!pipe->funcs || !pipe->funcs->disable)
+ return;
+
+ pipe->funcs->disable(pipe);
+}
+
+static const struct drm_crtc_helper_funcs drm_simple_kms_crtc_helper_funcs = {
+ .disable = drm_simple_kms_crtc_disable,
+ .enable = drm_simple_kms_crtc_enable,
+};
+
+static const struct drm_crtc_funcs drm_simple_kms_crtc_funcs = {
+ .reset = drm_atomic_helper_crtc_reset,
+ .destroy = drm_crtc_cleanup,
+ .set_config = drm_atomic_helper_set_config,
+ .page_flip = drm_atomic_helper_page_flip,
+ .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+};
+
+static int drm_simple_kms_plane_atomic_check(struct drm_plane *plane,
+ struct drm_plane_state *plane_state)
+{
+ struct drm_rect src = {
+ .x1 = plane_state->src_x,
+ .y1 = plane_state->src_y,
+ .x2 = plane_state->src_x + plane_state->src_w,
+ .y2 = plane_state->src_y + plane_state->src_h,
+ };
+ struct drm_rect dest = {
+ .x1 = plane_state->crtc_x,
+ .y1 = plane_state->crtc_y,
+ .x2 = plane_state->crtc_x + plane_state->crtc_w,
+ .y2 = plane_state->crtc_y + plane_state->crtc_h,
+ };
+ struct drm_rect clip = { 0 };
+ struct drm_simple_display_pipe *pipe;
+ struct drm_crtc_state *crtc_state;
+ bool visible;
+ int ret;
+
+ pipe = container_of(plane, struct drm_simple_display_pipe, plane);
+ crtc_state = drm_atomic_get_existing_crtc_state(plane_state->state,
+ &pipe->crtc);
+ if (crtc_state->enable != !!plane_state->crtc)
+ return -EINVAL; /* plane must match crtc enable state */
+
+ if (!crtc_state->enable)
+ return 0; /* nothing to check when disabling or disabled */
+
+ clip.x2 = crtc_state->adjusted_mode.hdisplay;
+ clip.y2 = crtc_state->adjusted_mode.vdisplay;
+ ret = drm_plane_helper_check_update(plane, &pipe->crtc,
+ plane_state->fb,
+ &src, &dest, &clip,
+ DRM_PLANE_HELPER_NO_SCALING,
+ DRM_PLANE_HELPER_NO_SCALING,
+ false, true, &visible);
+ if (ret)
+ return ret;
+
+ if (!visible)
+ return -EINVAL;
+
+ if (!pipe->funcs || !pipe->funcs->check)
+ return 0;
+
+ return pipe->funcs->check(pipe, plane_state, crtc_state);
+}
+
+static void drm_simple_kms_plane_atomic_update(struct drm_plane *plane,
+ struct drm_plane_state *pstate)
+{
+ struct drm_simple_display_pipe *pipe;
+
+ pipe = container_of(plane, struct drm_simple_display_pipe, plane);
+ if (!pipe->funcs || !pipe->funcs->update)
+ return;
+
+ pipe->funcs->update(pipe, pstate);
+}
+
+static const struct drm_plane_helper_funcs drm_simple_kms_plane_helper_funcs = {
+ .atomic_check = drm_simple_kms_plane_atomic_check,
+ .atomic_update = drm_simple_kms_plane_atomic_update,
+};
+
+static const struct drm_plane_funcs drm_simple_kms_plane_funcs = {
+ .update_plane = drm_atomic_helper_update_plane,
+ .disable_plane = drm_atomic_helper_disable_plane,
+ .destroy = drm_plane_cleanup,
+ .reset = drm_atomic_helper_plane_reset,
+ .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
+};
+
+/**
+ * drm_simple_display_pipe_init - Initialize a simple display pipeline
+ * @dev: DRM device
+ * @pipe: simple display pipe object to initialize
+ * @funcs: callbacks for the display pipe (optional)
+ * @formats: array of supported formats (%DRM_FORMAT_*)
+ * @format_count: number of elements in @formats
+ * @connector: connector to attach and register
+ *
+ * Sets up a display pipeline which consist of a really simple
+ * plane-crtc-encoder pipe coupled with the provided connector.
+ * Teardown of a simple display pipe is all handled automatically by the drm
+ * core through calling drm_mode_config_cleanup(). Drivers afterwards need to
+ * release the memory for the structure themselves.
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int drm_simple_display_pipe_init(struct drm_device *dev,
+ struct drm_simple_display_pipe *pipe,
+ struct drm_simple_display_pipe_funcs *funcs,
+ const uint32_t *formats,
+ unsigned int format_count,
+ struct drm_connector *connector)
+{
+ struct drm_encoder *encoder = &pipe->encoder;
+ struct drm_plane *plane = &pipe->plane;
+ struct drm_crtc *crtc = &pipe->crtc;
+ int ret;
+
+ pipe->funcs = funcs;
+
+ drm_plane_helper_add(plane, &drm_simple_kms_plane_helper_funcs);
+ ret = drm_universal_plane_init(dev, plane, 0,
+ &drm_simple_kms_plane_funcs,
+ formats, format_count,
+ DRM_PLANE_TYPE_PRIMARY, NULL);
+ if (ret)
+ return ret;
+
+ drm_crtc_helper_add(crtc, &drm_simple_kms_crtc_helper_funcs);
+ ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL,
+ &drm_simple_kms_crtc_funcs, NULL);
+ if (ret)
+ return ret;
+
+ encoder->possible_crtcs = 1 << drm_crtc_index(crtc);
+ ret = drm_encoder_init(dev, encoder, &drm_simple_kms_encoder_funcs,
+ DRM_MODE_ENCODER_NONE, NULL);
+ if (ret)
+ return ret;
+
+ ret = drm_mode_connector_attach_encoder(connector, encoder);
+ if (ret)
+ return ret;
+
+ return drm_connector_register(connector);
+}
+EXPORT_SYMBOL(drm_simple_display_pipe_init);
+
+MODULE_LICENSE("GPL");
diff --git a/include/drm/drm_simple_kms_helper.h b/include/drm/drm_simple_kms_helper.h
new file mode 100644
index 0000000..01f2e38
--- /dev/null
+++ b/include/drm/drm_simple_kms_helper.h
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2016 Noralf Trønnes
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __LINUX_DRM_SIMPLE_KMS_HELPER_H
+#define __LINUX_DRM_SIMPLE_KMS_HELPER_H
+
+struct drm_simple_display_pipe;
+
+/**
+ * struct drm_simple_display_pipe_funcs - helper operations for a simple
+ * display pipeline
+ */
+struct drm_simple_display_pipe_funcs {
+ /**
+ * @enable:
+ *
+ * This function should be used to enable the pipeline.
+ * It is called when the underlying crtc is enabled.
+ * This hook is optional.
+ */
+ void (*enable)(struct drm_simple_display_pipe *pipe,
+ struct drm_crtc_state *crtc_state);
+ /**
+ * @disable:
+ *
+ * This function should be used to disable the pipeline.
+ * It is called when the underlying crtc is disabled.
+ * This hook is optional.
+ */
+ void (*disable)(struct drm_simple_display_pipe *pipe);
+
+ /**
+ * @check:
+ *
+ * This function is called in the check phase of an atomic update,
+ * specifically when the underlying plane is checked.
+ * The simple display pipeline helpers already check that the plane is
+ * not scaled, fills the entire visible area and is always enabled
+ * when the crtc is also enabled.
+ * This hook is optional.
+ *
+ * RETURNS:
+ *
+ * 0 on success, -EINVAL if the state or the transition can't be
+ * supported, -ENOMEM on memory allocation failure and -EDEADLK if an
+ * attempt to obtain another state object ran into a &drm_modeset_lock
+ * deadlock.
+ */
+ int (*check)(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state,
+ struct drm_crtc_state *crtc_state);
+ /**
+ * @update:
+ *
+ * This function is called when the underlying plane state is updated.
+ * This hook is optional.
+ */
+ void (*update)(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state);
+};
+
+/**
+ * struct drm_simple_display_pipe - simple display pipeline
+ * @crtc: CRTC control structure
+ * @plane: Plane control structure
+ * @encoder: Encoder control structure
+ * @connector: Connector control structure
+ * @funcs: Pipeline control functions (optional)
+ *
+ * Simple display pipeline with plane, crtc and encoder collapsed into one
+ * entity. It should be initialized by calling drm_simple_display_pipe_init().
+ */
+struct drm_simple_display_pipe {
+ struct drm_crtc crtc;
+ struct drm_plane plane;
+ struct drm_encoder encoder;
+ struct drm_connector *connector;
+
+ struct drm_simple_display_pipe_funcs *funcs;
+};
+
+int drm_simple_display_pipe_init(struct drm_device *dev,
+ struct drm_simple_display_pipe *pipe,
+ struct drm_simple_display_pipe_funcs *funcs,
+ const uint32_t *formats,
+ unsigned int format_count,
+ struct drm_connector *connector);
+
+#endif /* __LINUX_DRM_SIMPLE_KMS_HELPER_H */
--
2.8.2
^ permalink raw reply related [flat|nested] 6+ messages in thread