Modesetting for fbconv supports a single display pipeline with CRTC,
primary plane, encoder and connector. It's implementation is based on
struct drm_simple_display_pipe, which fits this use case nicely.
Signed-off-by: Thomas Zimmermann <tzimmerm...@suse.de>
---
drivers/gpu/drm/drm_fbconv_helper.c | 382 ++++++++++++++++++++++++++++
include/drm/drm_fbconv_helper.h | 78 ++++++
2 files changed, 460 insertions(+)
diff --git a/drivers/gpu/drm/drm_fbconv_helper.c
b/drivers/gpu/drm/drm_fbconv_helper.c
index e5a58a361ae9..4cda1f15e072 100644
--- a/drivers/gpu/drm/drm_fbconv_helper.c
+++ b/drivers/gpu/drm/drm_fbconv_helper.c
@@ -4,8 +4,13 @@
#include <linux/fb.h>
+#include <drm/drm_atomic_helper.h>
#include <drm/drm_fbconv_helper.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_modes.h>
+#include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_probe_helper.h>
/*
* Format conversion helpers
@@ -635,3 +640,380 @@ void drm_fbconv_init_fb_var_screeninfo_from_mode(
drm_fbconv_update_fb_var_screeninfo_from_mode(fb_var, mode);
}
EXPORT_SYMBOL(drm_fbconv_init_fb_var_screeninfo_from_mode);
+
+/*
+ * Connector
+ */
+
+static int connector_helper_get_modes(struct drm_connector *connector)
+{
+ return 0;
+}
+
+static int connector_helper_detect_ctx(struct drm_connector *connector,
+ struct drm_modeset_acquire_ctx *ctx,
+ bool force)
+{
+ return connector_status_connected;
+}
+
+static enum drm_mode_status connector_helper_mode_valid(
+ struct drm_connector *connector, struct drm_display_mode *mode)
+{
+ return MODE_OK;
+}
+
+static int connector_helper_atomic_check(struct drm_connector *connector,
+ struct drm_atomic_state *state)
+{
+ return 0;
+}
+
+static void connector_helper_atomic_commit(struct drm_connector *connector,
+ struct drm_connector_state *state)
+{ }
+
+static const struct drm_connector_helper_funcs connector_helper_funcs = {
+ .get_modes = connector_helper_get_modes,
+ .detect_ctx = connector_helper_detect_ctx,
+ .mode_valid = connector_helper_mode_valid,
+ .best_encoder = NULL, /* use default */
+ .atomic_best_encoder = NULL, /* use best_encoder instead */
+ .atomic_check = connector_helper_atomic_check,
+ .atomic_commit = connector_helper_atomic_commit
+};
+
+static enum drm_connector_status connector_detect(
+ struct drm_connector *connector, bool force)
+{
+ return connector_status_connected;
+}
+
+static void connector_force(struct drm_connector *connector)
+{ }
+
+static void connector_destroy(struct drm_connector *connector)
+{ }
+
+static int connector_atomic_set_property(struct drm_connector *connector,
+ struct drm_connector_state *state,
+ struct drm_property *property,
+ uint64_t val)
+{
+ return -EINVAL;
+}
+
+static int connector_atomic_get_property(
+ struct drm_connector *connector,
+ const struct drm_connector_state *state, struct drm_property *property,
+ uint64_t *val)
+{
+ return -EINVAL;
+}
+
+static const struct drm_connector_funcs connector_funcs = {
+ .dpms = NULL, /* not used by atomic drivers */
+ .reset = drm_atomic_helper_connector_reset,
+ .detect = connector_detect,
+ .force = connector_force,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .set_property = NULL,
+ .late_register = NULL,
+ .early_unregister = NULL,
+ .destroy = connector_destroy,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+ .atomic_set_property = connector_atomic_set_property,
+ .atomic_get_property = connector_atomic_get_property,
+ .atomic_print_state = NULL
+};
+
+/*
+ * Simple display pipe
+ */
+
+/**
+ * drm_fbconv_simple_display_pipe_mode_valid - default implementation for
+ * struct drm_simple_display_pipe_funcs.mode_valid
+ * @crtc: the DRM CRTC structure
+ * @mode: the display mode to validate
+ * Returns:
+ * MODE_OK on success, or
+ * a MODE constant otherwise
+ */
+enum drm_mode_status
+drm_fbconv_simple_display_pipe_mode_valid(struct drm_crtc *crtc,
+ const struct drm_display_mode *mode)
+{
+ return MODE_OK;
+}
+EXPORT_SYMBOL(drm_fbconv_simple_display_pipe_mode_valid);
+
+/**
+ * drm_fbconv_simple_display_pipe_mode_fixup - default implementation for
+ * struct drm_simple_display_pipe_funcs.mode_fixup
+ * @crtc: the DRM CRTC structure
+ * @mode: the display mode
+ * @adjusted_mode: the adjusted display mode
+ * Returns:
+ * true on success, or
+ * false otherwise
+ */
+bool drm_fbconv_simple_display_pipe_mode_fixup(
+ struct drm_crtc *crtc, const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ return true;
+}
+EXPORT_SYMBOL(drm_fbconv_simple_display_pipe_mode_fixup);
+
+/**
+ * drm_fbconv_simple_display_pipe_enable - default implementation for
+ * struct drm_simple_display_pipe_funcs.enable
+ * @pipe: the display pipe structure
+ * @crtc_state: the new CRTC state
+ * @plane_state: the new plane state
+ */
+void
+drm_fbconv_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
+ struct drm_crtc_state *crtc_state,
+ struct drm_plane_state *plane_state)
+{ }
+EXPORT_SYMBOL(drm_fbconv_simple_display_pipe_enable);
+
+/**
+ * drm_fbconv_simple_display_pipe_disable - default implementation for
+ * struct drm_simple_display_pipe_funcs.disable
+ * @pipe: the display pipe structure
+ */
+void
+drm_fbconv_simple_display_pipe_disable(struct drm_simple_display_pipe *pipe)
+{ }
+EXPORT_SYMBOL(drm_fbconv_simple_display_pipe_disable);
+
+/**
+ * drm_fbconv_simple_display_pipe_check - default implementation for
+ * struct drm_simple_display_pipe_funcs.check
+ * @pipe: the display pipe structure
+ * @plane_state: the new plane state
+ * @crtc_state: the new CRTC state
+ */
+int
+drm_fbconv_simple_display_pipe_check(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state,
+ struct drm_crtc_state *crtc_state)
+{
+ return 0;
+}
+EXPORT_SYMBOL(drm_fbconv_simple_display_pipe_check);
+
+/**
+ * drm_fbconv_simple_display_pipe_mode_update - default implementation for
+ * struct drm_simple_display_pipe_funcs.update
+ * @pipe: the display pipe structure
+ * @old_plane_state: the old plane state
+ */
+void
+drm_fbconv_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *old_plane_state)
+{ }
+EXPORT_SYMBOL(drm_fbconv_simple_display_pipe_update);
+
+/**
+ * drm_fbconv_simple_display_pipe_prepare_fb - default implementation for
+ * struct drm_simple_display_pipe_funcs.prepare_fb
+ * @pipe: the display pipe structure
+ * @plane_state: the new plane state
+ * Returns:
+ * 0 on success, or
+ * a negative error code otherwise.
+ *
+ * The implementation of struct drm_simple_display_pipe_funcs.prepare_fb
+ * maps the framebuffer's buffer object and the fbdev's screen memory, if
+ * necessary. After converting the fbdev driver to DRM, only the buffer-object
+ * mapping should remaing. See drm_fbconv_simple_display_pipe_cleanup_fb() for
+ * the corresponding clean-up helper.
+ */
+int
+drm_fbconv_simple_display_pipe_prepare_fb(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state)
+{ }
+EXPORT_SYMBOL(drm_fbconv_simple_display_pipe_prepare_fb);
+
+/**
+ * drm_fbconv_simple_display_pipe_cleanup_fb - default implementation for
+ * struct drm_simple_display_pipe_funcs.cleanup_fb
+ * @pipe: the display pipe structure
+ * @plane_state: the old plane state
+ *
+ * This function cleans up the framebuffer state after a plane update. See
+ * drm_fbconv_simple_display_pipe_prepare_fb() for the corresponding prepare
+ * helper.
+ */
+void
+drm_fbconv_simple_display_pipe_cleanup_fb(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state)
+{ }
+
+static const struct drm_simple_display_pipe_funcs simple_display_pipe_funcs = {
+ .mode_valid = drm_fbconv_simple_display_pipe_mode_valid,
+ .mode_fixup = drm_fbconv_simple_display_pipe_mode_fixup,
+ .enable = drm_fbconv_simple_display_pipe_enable,
+ .disable = drm_fbconv_simple_display_pipe_disable,
+ .check = drm_fbconv_simple_display_pipe_check,
+ .update = drm_fbconv_simple_display_pipe_update,
+ .prepare_fb = drm_fbconv_simple_display_pipe_prepare_fb,
+ .cleanup_fb = drm_fbconv_simple_display_pipe_cleanup_fb,
+};
+
+/*
+ * Mode config
+ */
+
+static enum drm_mode_status mode_config_mode_valid(
+ struct drm_device *dev, const struct drm_display_mode *mode)
+{
+ return MODE_OK;
+}
+
+static const struct drm_mode_config_funcs mode_config_funcs = {
+ .fb_create = drm_gem_fb_create_with_dirty,
+ .get_format_info = NULL,
+ /* DRM porting notes: the output_poll_changed callback is used by
+ * fb helpers to implement fbdev emulation. If you're porting an
+ * fbdev driver to DRM and enable fbdev emulation, this callback
+ * will become useful.
+ */
+ .output_poll_changed = drm_fb_helper_output_poll_changed,
+ .mode_valid = mode_config_mode_valid,
+ .atomic_check = drm_atomic_helper_check,
+ .atomic_commit = drm_atomic_helper_commit,
+ .atomic_state_alloc = NULL,
+ .atomic_state_clear = NULL,
+ .atomic_state_free = NULL
+};
+
+/**
+ * drm_fbconv_modeset_init - initializes an fbconv modesetting structure
+ * @modeset: the fbconv modesetting structure to initialize
+ * @dev: the DRM device
+ * @fb_info: the fbdev driver's fb_info structure
+ * @max_width: the maximum display width that is supported by
+ * the device
+ * @max_height: the maximum display height that is supported by
+ * the device
+ * @preferred_depth: the device's preferred color depth
+ * Returns:
+ * 0 on success, or
+ * a negative error code otherwise
+ *
+ * This function initializes an instance of struct drm_fbconv_modeset. The
+ * supplied values for max_width, max_height, and max_depth should match the
+ * devices capabilities and be supported by the fbdev driver. DRM helpers
+ * will use these to auto-configure and validate display settings.
+ */
+int drm_fbconv_modeset_init(struct drm_fbconv_modeset *modeset,
+ struct drm_device *dev, struct fb_info *fb_info,
+ unsigned int max_width, unsigned int max_height,
+ unsigned int preferred_depth)
+{
+ struct drm_mode_config *mode_config = &dev->mode_config;
+
+ modeset->dev = dev;
+ modeset->fb_info = fb_info;
+
+ drm_mode_config_init(dev);
+
+ mode_config->max_width = (int)max_width;
+ mode_config->max_height = (int)max_height;
+ mode_config->fb_base = fb_info->fix.smem_start;
+ mode_config->preferred_depth = preferred_depth;
+ mode_config->prefer_shadow_fbdev = true;
+ mode_config->funcs = &mode_config_funcs;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_fbconv_modeset_init);
+
+/**
+ * drm_fbconv_modeset_cleanup - Cleans up an fbconv modesetting structure
+ * @modeset: the fbconv modesetting structure to clean up
+ */
+void drm_fbconv_modeset_cleanup(struct drm_fbconv_modeset *modeset)
+{
+ drm_mode_config_cleanup(modeset->dev);
+}
+EXPORT_SYMBOL(drm_fbconv_modeset_cleanup);
+
+/**
+ * drm_fbconv_modeset_setup_pipe - sets up the display pipeline for fbconv
+ * @modeset: an fbconv modesetting structure
+ * @funcs: an implementation of
+ * struct drm_simple_display_pipe_funcs, or NULL
+ * @formats: the device's supported display formats
+ * @format_count: the number of entries in @formats
+ * @format_modifiers: DRM format modifiers, or NULL
+ * @connector: the DRM connector, or NULL
+ * Returns:
+ * 0 on success, or
+ * a negative error code otherwise
+ *
+ * This function sets up the display pipeline for an initialized instance of
+ * struct drm_fbconv_modeset. For maximum compatibility with userspace, the
+ * provided list of formats should contain at least DRM_FORMAT_XRGB8888 and
+ * DRM_FORMAT_RGB565. The necessary conversion to the hardware's actual
+ * configuration can be performed by drm_fbconv_simple_display_pipe_update().
+ *
+ * The values for @funcs, @format_modifiers, and @connector should be NULL
+ * by default. Explicitly settings these parameters will only be helpful for
+ * refactoring an fbdev driver into a DRM driver.
+ */
+int
+drm_fbconv_modeset_setup_pipe(struct drm_fbconv_modeset *modeset,
+ const struct drm_simple_display_pipe_funcs *funcs,
+ const uint32_t *formats,
+ unsigned int format_count,
+ const uint64_t *format_modifiers,
+ struct drm_connector *connector)
+{
+ int ret;
+
+ /* DRM porting note: Now let's enable the display pipeline. If
+ * you're porting a framebuffer driver to DRM, you may want to
+ * set the correct connector type or replace the simple display
+ * pipeline with something more sophisticated.
+ */
+
+ if (!funcs)
+ funcs = &simple_display_pipe_funcs;
+
+ if (!connector) {
+ connector = &modeset->connector;
+
+ ret = drm_connector_init(modeset->dev, connector,
+ &connector_funcs,
+ DRM_MODE_CONNECTOR_Unknown);
+ if (ret)
+ return ret;
+ drm_connector_helper_add(connector, &connector_helper_funcs);
+
+ ret = drm_connector_register(connector);
+ if (ret < 0)
+ return ret;
+
+ }
+
+ ret = drm_simple_display_pipe_init(modeset->dev, &modeset->pipe,
+ funcs, formats, format_count,
+ format_modifiers, connector);
+ if (ret)
+ return ret;
+
+ /* Final step: resetting the device's mode config creates
+ * state for all objects in the mode-setting pipeline.
+ */
+ drm_mode_config_reset(modeset->dev);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_fbconv_modeset_setup_pipe);
diff --git a/include/drm/drm_fbconv_helper.h b/include/drm/drm_fbconv_helper.h
index cbb13228c76c..79716af687c1 100644
--- a/include/drm/drm_fbconv_helper.h
+++ b/include/drm/drm_fbconv_helper.h
@@ -3,7 +3,11 @@
#ifndef DRM_FBCONV_HELPER_H
#define DRM_FBCONV_HELPER_H
+#include <drm/drm_connector.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_encoder.h>
#include <drm/drm_fourcc.h>
+#include <drm/drm_simple_kms_helper.h>
struct drm_device;
struct drm_display_mode;
@@ -51,4 +55,78 @@ void drm_fbconv_update_fb_var_screeninfo_from_mode(
void drm_fbconv_init_fb_var_screeninfo_from_mode(
struct fb_var_screeninfo *var, const struct drm_display_mode *mode);
+/*
+ * Simple display pipe
+ */
+
+enum drm_mode_status
+drm_fbconv_simple_display_pipe_mode_valid(struct drm_crtc *crtc,
+ const struct drm_display_mode *mode);
+
+bool drm_fbconv_simple_display_pipe_mode_fixup(
+ struct drm_crtc *crtc, const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode);
+
+void
+drm_fbconv_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
+ struct drm_crtc_state *crtc_state,
+ struct drm_plane_state *plane_state);
+
+void
+drm_fbconv_simple_display_pipe_disable(struct drm_simple_display_pipe *pipe);
+
+int
+drm_fbconv_simple_display_pipe_check(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state,
+ struct drm_crtc_state *crtc_state);
+
+void
+drm_fbconv_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *old_plane_state);
+
+int
+drm_fbconv_simple_display_pipe_prepare_fb(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state);
+
+void
+drm_fbconv_simple_display_pipe_cleanup_fb(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *plane_state);
+
+/*
+ * Modeset helpers
+ */
+
+/**
+ * struct drm_fbconv_modeset - contains state for fbconv modesetting
+ * @connector: the DRM connector
+ * @pipe: the modesetting pipeline
+ * @dev: the DRM device
+ * @fb_info: the fbdev driver's fb_info structure
+ */
+struct drm_fbconv_modeset {
+ struct drm_connector connector;
+ struct drm_simple_display_pipe pipe;
+
+ struct drm_device *dev;
+ struct fb_info *fb_info;
+};
+
+static inline struct drm_fbconv_modeset *drm_fbconv_modeset_of_pipe(
+ struct drm_simple_display_pipe *pipe)
+{
+ return container_of(pipe, struct drm_fbconv_modeset, pipe);
+}
+
+int drm_fbconv_modeset_init(struct drm_fbconv_modeset *modeset,
+ struct drm_device *dev, struct fb_info *fb_info,
+ unsigned int max_width, unsigned int max_height,
+ unsigned int preferred_depth);
+void drm_fbconv_modeset_cleanup(struct drm_fbconv_modeset *modeset);
+
+int drm_fbconv_modeset_setup_pipe(
+ struct drm_fbconv_modeset *modeset,
+ const struct drm_simple_display_pipe_funcs *funcs,
+ const uint32_t *formats, unsigned int format_count,
+ const uint64_t *format_modifiers, struct drm_connector *connector);
+
#endif
--
2.23.0
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