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    Subject[PATCH v4 1/7] drm: Add DRM support for tiny LCD displays
    Date
    tinydrm provides helpers for very simple displays that can use
    CMA backed framebuffers and need flushing on changes.

    Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
    Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
    Acked-by: Thierry Reding <treding@nvidia.com>
    ---

    Changes since version 3:
    - Rebase on new drm_fbdev_cma_init_with_funcs() signature

    Documentation/gpu/index.rst | 1 +
    Documentation/gpu/tinydrm.rst | 21 ++
    drivers/gpu/drm/Kconfig | 2 +
    drivers/gpu/drm/Makefile | 1 +
    drivers/gpu/drm/tinydrm/Kconfig | 8 +
    drivers/gpu/drm/tinydrm/Makefile | 1 +
    drivers/gpu/drm/tinydrm/core/Makefile | 3 +
    drivers/gpu/drm/tinydrm/core/tinydrm-core.c | 376 ++++++++++++++++++++++++++++
    drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c | 234 +++++++++++++++++
    include/drm/tinydrm/tinydrm.h | 115 +++++++++
    10 files changed, 762 insertions(+)
    create mode 100644 Documentation/gpu/tinydrm.rst
    create mode 100644 drivers/gpu/drm/tinydrm/Kconfig
    create mode 100644 drivers/gpu/drm/tinydrm/Makefile
    create mode 100644 drivers/gpu/drm/tinydrm/core/Makefile
    create mode 100644 drivers/gpu/drm/tinydrm/core/tinydrm-core.c
    create mode 100644 drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
    create mode 100644 include/drm/tinydrm/tinydrm.h

    diff --git a/Documentation/gpu/index.rst b/Documentation/gpu/index.rst
    index 367d7c3..f81278a 100644
    --- a/Documentation/gpu/index.rst
    +++ b/Documentation/gpu/index.rst
    @@ -11,6 +11,7 @@ Linux GPU Driver Developer's Guide
    drm-kms-helpers
    drm-uapi
    i915
    + tinydrm
    vga-switcheroo
    vgaarbiter

    diff --git a/Documentation/gpu/tinydrm.rst b/Documentation/gpu/tinydrm.rst
    new file mode 100644
    index 0000000..ec4a20d
    --- /dev/null
    +++ b/Documentation/gpu/tinydrm.rst
    @@ -0,0 +1,21 @@
    +==========================
    +drm/tinydrm Driver library
    +==========================
    +
    +.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-core.c
    + :doc: overview
    +
    +Core functionality
    +==================
    +
    +.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-core.c
    + :doc: core
    +
    +.. kernel-doc:: include/drm/tinydrm/tinydrm.h
    + :internal:
    +
    +.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-core.c
    + :export:
    +
    +.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
    + :export:
    diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
    index 90bc65d..88e01e08e 100644
    --- a/drivers/gpu/drm/Kconfig
    +++ b/drivers/gpu/drm/Kconfig
    @@ -263,6 +263,8 @@ source "drivers/gpu/drm/mxsfb/Kconfig"

    source "drivers/gpu/drm/meson/Kconfig"

    +source "drivers/gpu/drm/tinydrm/Kconfig"
    +
    # Keep legacy drivers last

    menuconfig DRM_LEGACY
    diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
    index 92de399..3ee9579 100644
    --- a/drivers/gpu/drm/Makefile
    +++ b/drivers/gpu/drm/Makefile
    @@ -94,3 +94,4 @@ obj-$(CONFIG_DRM_ARCPGU)+= arc/
    obj-y += hisilicon/
    obj-$(CONFIG_DRM_ZTE) += zte/
    obj-$(CONFIG_DRM_MXSFB) += mxsfb/
    +obj-$(CONFIG_DRM_TINYDRM) += tinydrm/
    diff --git a/drivers/gpu/drm/tinydrm/Kconfig b/drivers/gpu/drm/tinydrm/Kconfig
    new file mode 100644
    index 0000000..ffb873f
    --- /dev/null
    +++ b/drivers/gpu/drm/tinydrm/Kconfig
    @@ -0,0 +1,8 @@
    +menuconfig DRM_TINYDRM
    + tristate "Support for simple displays"
    + depends on DRM
    + select DRM_KMS_HELPER
    + select DRM_KMS_CMA_HELPER
    + help
    + Choose this option if you have a tinydrm supported display.
    + If M is selected the module will be called tinydrm.
    diff --git a/drivers/gpu/drm/tinydrm/Makefile b/drivers/gpu/drm/tinydrm/Makefile
    new file mode 100644
    index 0000000..7476ed1
    --- /dev/null
    +++ b/drivers/gpu/drm/tinydrm/Makefile
    @@ -0,0 +1 @@
    +obj-$(CONFIG_DRM_TINYDRM) += core/
    diff --git a/drivers/gpu/drm/tinydrm/core/Makefile b/drivers/gpu/drm/tinydrm/core/Makefile
    new file mode 100644
    index 0000000..4f14a0f
    --- /dev/null
    +++ b/drivers/gpu/drm/tinydrm/core/Makefile
    @@ -0,0 +1,3 @@
    +tinydrm-y := tinydrm-core.o tinydrm-pipe.o
    +
    +obj-$(CONFIG_DRM_TINYDRM) += tinydrm.o
    diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-core.c b/drivers/gpu/drm/tinydrm/core/tinydrm-core.c
    new file mode 100644
    index 0000000..6a257dd
    --- /dev/null
    +++ b/drivers/gpu/drm/tinydrm/core/tinydrm-core.c
    @@ -0,0 +1,376 @@
    +/*
    + * 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/drm_atomic.h>
    +#include <drm/drm_atomic_helper.h>
    +#include <drm/drm_crtc_helper.h>
    +#include <drm/tinydrm/tinydrm.h>
    +#include <linux/device.h>
    +#include <linux/dma-buf.h>
    +
    +/**
    + * DOC: overview
    + *
    + * This library provides driver helpers for very simple display hardware.
    + *
    + * It is based on &drm_simple_display_pipe coupled with a &drm_connector which
    + * has only one fixed &drm_display_mode. The framebuffers are backed by the
    + * cma helper and have support for framebuffer flushing (dirty).
    + * fbdev support is also included.
    + *
    + */
    +
    +/**
    + * DOC: core
    + *
    + * The driver allocates &tinydrm_device, initializes it using
    + * devm_tinydrm_init(), sets up the pipeline using tinydrm_display_pipe_init()
    + * and registers the DRM device using devm_tinydrm_register().
    + */
    +
    +/**
    + * tinydrm_lastclose - DRM lastclose helper
    + * @drm: DRM device
    + *
    + * This function ensures that fbdev is restored when drm_lastclose() is called
    + * on the last drm_release(). Drivers can use this as their
    + * &drm_driver->lastclose callback.
    + */
    +void tinydrm_lastclose(struct drm_device *drm)
    +{
    + struct tinydrm_device *tdev = drm->dev_private;
    +
    + DRM_DEBUG_KMS("\n");
    + drm_fbdev_cma_restore_mode(tdev->fbdev_cma);
    +}
    +EXPORT_SYMBOL(tinydrm_lastclose);
    +
    +/**
    + * tinydrm_gem_cma_prime_import_sg_table - Produce a CMA GEM object from
    + * another driver's scatter/gather table of pinned pages
    + * @drm: DRM device to import into
    + * @attach: DMA-BUF attachment
    + * @sgt: Scatter/gather table of pinned pages
    + *
    + * This function imports a scatter/gather table exported via DMA-BUF by
    + * another driver using drm_gem_cma_prime_import_sg_table(). It sets the
    + * kernel virtual address on the CMA object. Drivers should use this as their
    + * &drm_driver->gem_prime_import_sg_table callback if they need the virtual
    + * address. tinydrm_gem_cma_free_object() should be used in combination with
    + * this function.
    + *
    + * Returns:
    + * A pointer to a newly created GEM object or an ERR_PTR-encoded negative
    + * error code on failure.
    + */
    +struct drm_gem_object *
    +tinydrm_gem_cma_prime_import_sg_table(struct drm_device *drm,
    + struct dma_buf_attachment *attach,
    + struct sg_table *sgt)
    +{
    + struct drm_gem_cma_object *cma_obj;
    + struct drm_gem_object *obj;
    + void *vaddr;
    +
    + vaddr = dma_buf_vmap(attach->dmabuf);
    + if (!vaddr) {
    + DRM_ERROR("Failed to vmap PRIME buffer\n");
    + return ERR_PTR(-ENOMEM);
    + }
    +
    + obj = drm_gem_cma_prime_import_sg_table(drm, attach, sgt);
    + if (IS_ERR(obj)) {
    + dma_buf_vunmap(attach->dmabuf, vaddr);
    + return obj;
    + }
    +
    + cma_obj = to_drm_gem_cma_obj(obj);
    + cma_obj->vaddr = vaddr;
    +
    + return obj;
    +}
    +EXPORT_SYMBOL(tinydrm_gem_cma_prime_import_sg_table);
    +
    +/**
    + * tinydrm_gem_cma_free_object - Free resources associated with a CMA GEM
    + * object
    + * @gem_obj: GEM object to free
    + *
    + * This function frees the backing memory of the CMA GEM object, cleans up the
    + * GEM object state and frees the memory used to store the object itself using
    + * drm_gem_cma_free_object(). It also handles PRIME buffers which has the kernel
    + * virtual address set by tinydrm_gem_cma_prime_import_sg_table(). Drivers
    + * can use this as their &drm_driver->gem_free_object callback.
    + */
    +void tinydrm_gem_cma_free_object(struct drm_gem_object *gem_obj)
    +{
    + if (gem_obj->import_attach) {
    + struct drm_gem_cma_object *cma_obj;
    +
    + cma_obj = to_drm_gem_cma_obj(gem_obj);
    + dma_buf_vunmap(gem_obj->import_attach->dmabuf, cma_obj->vaddr);
    + cma_obj->vaddr = NULL;
    + }
    +
    + drm_gem_cma_free_object(gem_obj);
    +}
    +EXPORT_SYMBOL_GPL(tinydrm_gem_cma_free_object);
    +
    +const struct file_operations tinydrm_fops = {
    + .owner = THIS_MODULE,
    + .open = drm_open,
    + .release = drm_release,
    + .unlocked_ioctl = drm_ioctl,
    +#ifdef CONFIG_COMPAT
    + .compat_ioctl = drm_compat_ioctl,
    +#endif
    + .poll = drm_poll,
    + .read = drm_read,
    + .llseek = no_llseek,
    + .mmap = drm_gem_cma_mmap,
    +};
    +EXPORT_SYMBOL(tinydrm_fops);
    +
    +static struct drm_framebuffer *
    +tinydrm_fb_create(struct drm_device *drm, struct drm_file *file_priv,
    + const struct drm_mode_fb_cmd2 *mode_cmd)
    +{
    + struct tinydrm_device *tdev = drm->dev_private;
    +
    + return drm_fb_cma_create_with_funcs(drm, file_priv, mode_cmd,
    + tdev->fb_funcs);
    +}
    +
    +static const struct drm_mode_config_funcs tinydrm_mode_config_funcs = {
    + .fb_create = tinydrm_fb_create,
    + .atomic_check = drm_atomic_helper_check,
    + .atomic_commit = drm_atomic_helper_commit,
    +};
    +
    +static int tinydrm_init(struct device *parent, struct tinydrm_device *tdev,
    + const struct drm_framebuffer_funcs *fb_funcs,
    + struct drm_driver *driver)
    +{
    + struct drm_device *drm;
    +
    + mutex_init(&tdev->dirty_lock);
    + tdev->fb_funcs = fb_funcs;
    +
    + /*
    + * We don't embed drm_device, because that prevent us from using
    + * devm_kzalloc() to allocate tinydrm_device in the driver since
    + * drm_dev_unref() frees the structure. The devm_ functions provide
    + * for easy error handling.
    + */
    + drm = drm_dev_alloc(driver, parent);
    + if (IS_ERR(drm))
    + return PTR_ERR(drm);
    +
    + tdev->drm = drm;
    + drm->dev_private = tdev;
    + drm_mode_config_init(drm);
    + drm->mode_config.funcs = &tinydrm_mode_config_funcs;
    +
    + return 0;
    +}
    +
    +static void tinydrm_fini(struct tinydrm_device *tdev)
    +{
    + drm_mode_config_cleanup(tdev->drm);
    + mutex_destroy(&tdev->dirty_lock);
    + tdev->drm->dev_private = NULL;
    + drm_dev_unref(tdev->drm);
    +}
    +
    +static void devm_tinydrm_release(void *data)
    +{
    + tinydrm_fini(data);
    +}
    +
    +/**
    + * devm_tinydrm_init - Initialize tinydrm device
    + * @parent: Parent device object
    + * @tdev: tinydrm device
    + * @fb_funcs: Framebuffer functions
    + * @driver: DRM driver
    + *
    + * This function initializes @tdev, the underlying DRM device and it's
    + * mode_config. Resources will be automatically freed on driver detach (devres)
    + * using drm_mode_config_cleanup() and drm_dev_unref().
    + *
    + * Returns:
    + * Zero on success, negative error code on failure.
    + */
    +int devm_tinydrm_init(struct device *parent, struct tinydrm_device *tdev,
    + const struct drm_framebuffer_funcs *fb_funcs,
    + struct drm_driver *driver)
    +{
    + int ret;
    +
    + ret = tinydrm_init(parent, tdev, fb_funcs, driver);
    + if (ret)
    + return ret;
    +
    + ret = devm_add_action(parent, devm_tinydrm_release, tdev);
    + if (ret)
    + tinydrm_fini(tdev);
    +
    + return ret;
    +}
    +EXPORT_SYMBOL(devm_tinydrm_init);
    +
    +static int tinydrm_register(struct tinydrm_device *tdev)
    +{
    + struct drm_device *drm = tdev->drm;
    + int bpp = drm->mode_config.preferred_depth;
    + struct drm_fbdev_cma *fbdev;
    + int ret;
    +
    + ret = drm_dev_register(tdev->drm, 0);
    + if (ret)
    + return ret;
    +
    + fbdev = drm_fbdev_cma_init_with_funcs(drm, bpp ? bpp : 32,
    + drm->mode_config.num_connector,
    + tdev->fb_funcs);
    + if (IS_ERR(fbdev))
    + DRM_ERROR("Failed to initialize fbdev: %ld\n", PTR_ERR(fbdev));
    + else
    + tdev->fbdev_cma = fbdev;
    +
    + return 0;
    +}
    +
    +static void tinydrm_unregister(struct tinydrm_device *tdev)
    +{
    + struct drm_fbdev_cma *fbdev_cma = tdev->fbdev_cma;
    +
    + drm_crtc_force_disable_all(tdev->drm);
    + /* don't restore fbdev in lastclose, keep pipeline disabled */
    + tdev->fbdev_cma = NULL;
    + drm_dev_unregister(tdev->drm);
    + if (fbdev_cma)
    + drm_fbdev_cma_fini(fbdev_cma);
    +}
    +
    +static void devm_tinydrm_register_release(void *data)
    +{
    + tinydrm_unregister(data);
    +}
    +
    +/**
    + * devm_tinydrm_register - Register tinydrm device
    + * @tdev: tinydrm device
    + *
    + * This function registers the underlying DRM device and fbdev.
    + * These resources will be automatically unregistered on driver detach (devres)
    + * and the display pipeline will be disabled.
    + *
    + * Returns:
    + * Zero on success, negative error code on failure.
    + */
    +int devm_tinydrm_register(struct tinydrm_device *tdev)
    +{
    + struct device *dev = tdev->drm->dev;
    + int ret;
    +
    + ret = tinydrm_register(tdev);
    + if (ret)
    + return ret;
    +
    + ret = devm_add_action(dev, devm_tinydrm_register_release, tdev);
    + if (ret)
    + tinydrm_unregister(tdev);
    +
    + return ret;
    +}
    +EXPORT_SYMBOL(devm_tinydrm_register);
    +
    +/**
    + * tinydrm_shutdown - Shutdown tinydrm
    + * @tdev: tinydrm device
    + *
    + * This function makes sure that the display pipeline is disabled.
    + * Used by drivers in their shutdown callback to turn off the display
    + * on machine shutdown and reboot.
    + */
    +void tinydrm_shutdown(struct tinydrm_device *tdev)
    +{
    + drm_crtc_force_disable_all(tdev->drm);
    +}
    +EXPORT_SYMBOL(tinydrm_shutdown);
    +
    +/**
    + * tinydrm_suspend - Suspend tinydrm
    + * @tdev: tinydrm device
    + *
    + * Used in driver PM operations to suspend tinydrm.
    + * Suspends fbdev and DRM.
    + * Resume with tinydrm_resume().
    + *
    + * Returns:
    + * Zero on success, negative error code on failure.
    + */
    +int tinydrm_suspend(struct tinydrm_device *tdev)
    +{
    + struct drm_atomic_state *state;
    +
    + if (tdev->suspend_state) {
    + DRM_ERROR("Failed to suspend: state already set\n");
    + return -EINVAL;
    + }
    +
    + drm_fbdev_cma_set_suspend_unlocked(tdev->fbdev_cma, 1);
    + state = drm_atomic_helper_suspend(tdev->drm);
    + if (IS_ERR(state)) {
    + drm_fbdev_cma_set_suspend_unlocked(tdev->fbdev_cma, 0);
    + return PTR_ERR(state);
    + }
    +
    + tdev->suspend_state = state;
    +
    + return 0;
    +}
    +EXPORT_SYMBOL(tinydrm_suspend);
    +
    +/**
    + * tinydrm_resume - Resume tinydrm
    + * @tdev: tinydrm device
    + *
    + * Used in driver PM operations to resume tinydrm.
    + * Suspend with tinydrm_suspend().
    + *
    + * Returns:
    + * Zero on success, negative error code on failure.
    + */
    +int tinydrm_resume(struct tinydrm_device *tdev)
    +{
    + struct drm_atomic_state *state = tdev->suspend_state;
    + int ret;
    +
    + if (!state) {
    + DRM_ERROR("Failed to resume: state is not set\n");
    + return -EINVAL;
    + }
    +
    + tdev->suspend_state = NULL;
    +
    + ret = drm_atomic_helper_resume(tdev->drm, state);
    + if (ret) {
    + DRM_ERROR("Error resuming state: %d\n", ret);
    + return ret;
    + }
    +
    + drm_fbdev_cma_set_suspend_unlocked(tdev->fbdev_cma, 0);
    +
    + return 0;
    +}
    +EXPORT_SYMBOL(tinydrm_resume);
    +
    +MODULE_LICENSE("GPL");
    diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c b/drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
    new file mode 100644
    index 0000000..ec43fb7
    --- /dev/null
    +++ b/drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
    @@ -0,0 +1,234 @@
    +/*
    + * 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/drm_atomic_helper.h>
    +#include <drm/drm_crtc_helper.h>
    +#include <drm/drm_modes.h>
    +#include <drm/tinydrm/tinydrm.h>
    +
    +struct tinydrm_connector {
    + struct drm_connector base;
    + const struct drm_display_mode *mode;
    +};
    +
    +static inline struct tinydrm_connector *
    +to_tinydrm_connector(struct drm_connector *connector)
    +{
    + return container_of(connector, struct tinydrm_connector, base);
    +}
    +
    +static int tinydrm_connector_get_modes(struct drm_connector *connector)
    +{
    + struct tinydrm_connector *tconn = to_tinydrm_connector(connector);
    + struct drm_display_mode *mode;
    +
    + mode = drm_mode_duplicate(connector->dev, tconn->mode);
    + if (!mode) {
    + DRM_ERROR("Failed to duplicate mode\n");
    + return 0;
    + }
    +
    + if (mode->name[0] == '\0')
    + drm_mode_set_name(mode);
    +
    + mode->type |= DRM_MODE_TYPE_PREFERRED;
    + drm_mode_probed_add(connector, mode);
    +
    + if (mode->width_mm) {
    + connector->display_info.width_mm = mode->width_mm;
    + connector->display_info.height_mm = mode->height_mm;
    + }
    +
    + return 1;
    +}
    +
    +static const struct drm_connector_helper_funcs tinydrm_connector_hfuncs = {
    + .get_modes = tinydrm_connector_get_modes,
    + .best_encoder = drm_atomic_helper_best_encoder,
    +};
    +
    +static enum drm_connector_status
    +tinydrm_connector_detect(struct drm_connector *connector, bool force)
    +{
    + if (drm_device_is_unplugged(connector->dev))
    + return connector_status_disconnected;
    +
    + return connector->status;
    +}
    +
    +static void tinydrm_connector_destroy(struct drm_connector *connector)
    +{
    + struct tinydrm_connector *tconn = to_tinydrm_connector(connector);
    +
    + drm_connector_cleanup(connector);
    + kfree(tconn);
    +}
    +
    +static const struct drm_connector_funcs tinydrm_connector_funcs = {
    + .dpms = drm_atomic_helper_connector_dpms,
    + .reset = drm_atomic_helper_connector_reset,
    + .detect = tinydrm_connector_detect,
    + .fill_modes = drm_helper_probe_single_connector_modes,
    + .destroy = tinydrm_connector_destroy,
    + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
    + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
    +};
    +
    +struct drm_connector *
    +tinydrm_connector_create(struct drm_device *drm,
    + const struct drm_display_mode *mode,
    + int connector_type)
    +{
    + struct tinydrm_connector *tconn;
    + struct drm_connector *connector;
    + int ret;
    +
    + tconn = kzalloc(sizeof(*tconn), GFP_KERNEL);
    + if (!tconn)
    + return ERR_PTR(-ENOMEM);
    +
    + tconn->mode = mode;
    + connector = &tconn->base;
    +
    + drm_connector_helper_add(connector, &tinydrm_connector_hfuncs);
    + ret = drm_connector_init(drm, connector, &tinydrm_connector_funcs,
    + connector_type);
    + if (ret) {
    + kfree(tconn);
    + return ERR_PTR(ret);
    + }
    +
    + connector->status = connector_status_connected;
    +
    + return connector;
    +}
    +
    +/**
    + * tinydrm_display_pipe_update - Display pipe update helper
    + * @pipe: Simple display pipe
    + * @old_state: Old plane state
    + *
    + * This function does a full framebuffer flush if the plane framebuffer
    + * has changed. It also handles vblank events. Drivers can use this as their
    + * &drm_simple_display_pipe_funcs->update callback.
    + */
    +void tinydrm_display_pipe_update(struct drm_simple_display_pipe *pipe,
    + struct drm_plane_state *old_state)
    +{
    + struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
    + struct drm_framebuffer *fb = pipe->plane.state->fb;
    + struct drm_crtc *crtc = &tdev->pipe.crtc;
    +
    + if (fb && (fb != old_state->fb)) {
    + pipe->plane.fb = fb;
    + if (fb->funcs->dirty)
    + fb->funcs->dirty(fb, NULL, 0, 0, NULL, 0);
    + }
    +
    + if (crtc->state->event) {
    + spin_lock_irq(&crtc->dev->event_lock);
    + drm_crtc_send_vblank_event(crtc, crtc->state->event);
    + spin_unlock_irq(&crtc->dev->event_lock);
    + crtc->state->event = NULL;
    + }
    +}
    +EXPORT_SYMBOL(tinydrm_display_pipe_update);
    +
    +/**
    + * tinydrm_display_pipe_prepare_fb - Display pipe prepare_fb helper
    + * @pipe: Simple display pipe
    + * @plane_state: Plane state
    + *
    + * This function uses drm_fb_cma_prepare_fb() to check if the plane FB has an
    + * dma-buf attached, extracts the exclusive fence and attaches it to plane
    + * state for the atomic helper to wait on. Drivers can use this as their
    + * &drm_simple_display_pipe_funcs->prepare_fb callback.
    + */
    +int tinydrm_display_pipe_prepare_fb(struct drm_simple_display_pipe *pipe,
    + struct drm_plane_state *plane_state)
    +{
    + return drm_fb_cma_prepare_fb(&pipe->plane, plane_state);
    +}
    +EXPORT_SYMBOL(tinydrm_display_pipe_prepare_fb);
    +
    +static int tinydrm_rotate_mode(struct drm_display_mode *mode,
    + unsigned int rotation)
    +{
    + if (rotation == 0 || rotation == 180) {
    + return 0;
    + } else if (rotation == 90 || rotation == 270) {
    + swap(mode->hdisplay, mode->vdisplay);
    + swap(mode->hsync_start, mode->vsync_start);
    + swap(mode->hsync_end, mode->vsync_end);
    + swap(mode->htotal, mode->vtotal);
    + swap(mode->width_mm, mode->height_mm);
    + return 0;
    + } else {
    + return -EINVAL;
    + }
    +}
    +
    +/**
    + * tinydrm_display_pipe_init - Initialize display pipe
    + * @tdev: tinydrm device
    + * @funcs: Display pipe functions
    + * @connector_type: Connector type
    + * @formats: Array of supported formats (DRM_FORMAT\_\*)
    + * @format_count: Number of elements in @formats
    + * @mode: Supported mode
    + * @rotation: Initial @mode rotation in degrees Counter Clock Wise
    + *
    + * This function sets up a &drm_simple_display_pipe with a &drm_connector that
    + * has one fixed &drm_display_mode which is rotated according to @rotation.
    + *
    + * Returns:
    + * Zero on success, negative error code on failure.
    + */
    +int
    +tinydrm_display_pipe_init(struct tinydrm_device *tdev,
    + const struct drm_simple_display_pipe_funcs *funcs,
    + int connector_type,
    + const uint32_t *formats,
    + unsigned int format_count,
    + const struct drm_display_mode *mode,
    + unsigned int rotation)
    +{
    + struct drm_device *drm = tdev->drm;
    + struct drm_display_mode *mode_copy;
    + struct drm_connector *connector;
    + int ret;
    +
    + mode_copy = devm_kmalloc(drm->dev, sizeof(*mode_copy), GFP_KERNEL);
    + if (!mode_copy)
    + return -ENOMEM;
    +
    + *mode_copy = *mode;
    + ret = tinydrm_rotate_mode(mode_copy, rotation);
    + if (ret) {
    + DRM_ERROR("Illegal rotation value %u\n", rotation);
    + return -EINVAL;
    + }
    +
    + drm->mode_config.min_width = mode_copy->hdisplay;
    + drm->mode_config.max_width = mode_copy->hdisplay;
    + drm->mode_config.min_height = mode_copy->vdisplay;
    + drm->mode_config.max_height = mode_copy->vdisplay;
    +
    + connector = tinydrm_connector_create(drm, mode_copy, connector_type);
    + if (IS_ERR(connector))
    + return PTR_ERR(connector);
    +
    + ret = drm_simple_display_pipe_init(drm, &tdev->pipe, funcs, formats,
    + format_count, connector);
    + if (ret)
    + return ret;
    +
    + return 0;
    +}
    +EXPORT_SYMBOL(tinydrm_display_pipe_init);
    diff --git a/include/drm/tinydrm/tinydrm.h b/include/drm/tinydrm/tinydrm.h
    new file mode 100644
    index 0000000..cf9ca20
    --- /dev/null
    +++ b/include/drm/tinydrm/tinydrm.h
    @@ -0,0 +1,115 @@
    +/*
    + * 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_TINYDRM_H
    +#define __LINUX_TINYDRM_H
    +
    +#include <drm/drm_gem_cma_helper.h>
    +#include <drm/drm_fb_cma_helper.h>
    +#include <drm/drm_simple_kms_helper.h>
    +
    +/**
    + * struct tinydrm_device - tinydrm device
    + * @drm: DRM device
    + * @pipe: Display pipe structure
    + * @dirty_lock: Serializes framebuffer flushing
    + * @fbdev_cma: CMA fbdev structure
    + * @suspend_state: Atomic state when suspended
    + * @fb_funcs: Framebuffer functions used when creating framebuffers
    + */
    +struct tinydrm_device {
    + struct drm_device *drm;
    + struct drm_simple_display_pipe pipe;
    + struct mutex dirty_lock;
    + struct drm_fbdev_cma *fbdev_cma;
    + struct drm_atomic_state *suspend_state;
    + const struct drm_framebuffer_funcs *fb_funcs;
    +};
    +
    +static inline struct tinydrm_device *
    +pipe_to_tinydrm(struct drm_simple_display_pipe *pipe)
    +{
    + return container_of(pipe, struct tinydrm_device, pipe);
    +}
    +
    +/**
    + * TINYDRM_GEM_DRIVER_OPS - default tinydrm gem operations
    + *
    + * This macro provides a shortcut for setting the tinydrm GEM operations in
    + * the &drm_driver structure.
    + */
    +#define TINYDRM_GEM_DRIVER_OPS \
    + .gem_free_object = tinydrm_gem_cma_free_object, \
    + .gem_vm_ops = &drm_gem_cma_vm_ops, \
    + .prime_handle_to_fd = drm_gem_prime_handle_to_fd, \
    + .prime_fd_to_handle = drm_gem_prime_fd_to_handle, \
    + .gem_prime_import = drm_gem_prime_import, \
    + .gem_prime_export = drm_gem_prime_export, \
    + .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, \
    + .gem_prime_import_sg_table = tinydrm_gem_cma_prime_import_sg_table, \
    + .gem_prime_vmap = drm_gem_cma_prime_vmap, \
    + .gem_prime_vunmap = drm_gem_cma_prime_vunmap, \
    + .gem_prime_mmap = drm_gem_cma_prime_mmap, \
    + .dumb_create = drm_gem_cma_dumb_create, \
    + .dumb_map_offset = drm_gem_cma_dumb_map_offset, \
    + .dumb_destroy = drm_gem_dumb_destroy, \
    + .fops = &tinydrm_fops
    +
    +/**
    + * TINYDRM_MODE - tinydrm display mode
    + * @hd: Horizontal resolution, width
    + * @vd: Vertical resolution, height
    + * @hd_mm: Display width in millimeters
    + * @vd_mm: Display height in millimeters
    + *
    + * This macro creates a &drm_display_mode for use with tinydrm.
    + */
    +#define TINYDRM_MODE(hd, vd, hd_mm, vd_mm) \
    + .hdisplay = (hd), \
    + .hsync_start = (hd), \
    + .hsync_end = (hd), \
    + .htotal = (hd), \
    + .vdisplay = (vd), \
    + .vsync_start = (vd), \
    + .vsync_end = (vd), \
    + .vtotal = (vd), \
    + .width_mm = (hd_mm), \
    + .height_mm = (vd_mm), \
    + .type = DRM_MODE_TYPE_DRIVER, \
    + .clock = 1 /* pass validation */
    +
    +extern const struct file_operations tinydrm_fops;
    +void tinydrm_lastclose(struct drm_device *drm);
    +void tinydrm_gem_cma_free_object(struct drm_gem_object *gem_obj);
    +struct drm_gem_object *
    +tinydrm_gem_cma_prime_import_sg_table(struct drm_device *drm,
    + struct dma_buf_attachment *attach,
    + struct sg_table *sgt);
    +int devm_tinydrm_init(struct device *parent, struct tinydrm_device *tdev,
    + const struct drm_framebuffer_funcs *fb_funcs,
    + struct drm_driver *driver);
    +int devm_tinydrm_register(struct tinydrm_device *tdev);
    +void tinydrm_shutdown(struct tinydrm_device *tdev);
    +int tinydrm_suspend(struct tinydrm_device *tdev);
    +int tinydrm_resume(struct tinydrm_device *tdev);
    +
    +void tinydrm_display_pipe_update(struct drm_simple_display_pipe *pipe,
    + struct drm_plane_state *old_state);
    +int tinydrm_display_pipe_prepare_fb(struct drm_simple_display_pipe *pipe,
    + struct drm_plane_state *plane_state);
    +int
    +tinydrm_display_pipe_init(struct tinydrm_device *tdev,
    + const struct drm_simple_display_pipe_funcs *funcs,
    + int connector_type,
    + const uint32_t *formats,
    + unsigned int format_count,
    + const struct drm_display_mode *mode,
    + unsigned int rotation);
    +
    +#endif /* __LINUX_TINYDRM_H */
    --
    2.10.2
    \
     
     \ /
      Last update: 2017-02-11 19:51    [W:4.807 / U:0.288 seconds]
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