* [PATCH v3 1/7] drm: Add DRM support for tiny LCD displays
2017-01-31 16:03 [PATCH v3 0/7] drm: Add support for tiny LCD displays Noralf Trønnes
@ 2017-01-31 16:03 ` Noralf Trønnes
2017-01-31 16:23 ` Daniel Vetter
` (2 more replies)
2017-01-31 16:03 ` [PATCH v3 2/7] drm/tinydrm: Add helper functions Noralf Trønnes
` (6 subsequent siblings)
7 siblings, 3 replies; 45+ messages in thread
From: Noralf Trønnes @ 2017-01-31 16:03 UTC (permalink / raw)
To: dri-devel, devicetree; +Cc: thomas.petazzoni, linux-kernel
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>
---
Changes since version 2:
- Remove fbdev after drm unregister, not before.
Changes since version 1:
- Add tinydrm.rst
- Set tdev->fbdev_cma=NULL on unregister (lastclose is called after that).
- Remove some DRM_DEBUG*()
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 | 377 ++++++++++++++++++++++++++++
drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c | 234 +++++++++++++++++
include/drm/tinydrm/tinydrm.h | 115 +++++++++
10 files changed, 763 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..c0a2eb6
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/core/tinydrm-core.c
@@ -0,0 +1,377 @@
+/*
+ * 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_crtc,
+ 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
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^ permalink raw reply related [flat|nested] 45+ messages in thread* Re: [PATCH v3 1/7] drm: Add DRM support for tiny LCD displays
2017-01-31 16:03 ` [PATCH v3 1/7] drm: Add DRM " Noralf Trønnes
@ 2017-01-31 16:23 ` Daniel Vetter
[not found] ` <20170131162341.ejr2b3bq7tghafzj-dv86pmgwkMBes7Z6vYuT8azUEOm+Xw19@public.gmane.org>
2017-02-06 9:17 ` Thierry Reding
2017-02-06 10:12 ` Jani Nikula
2 siblings, 1 reply; 45+ messages in thread
From: Daniel Vetter @ 2017-01-31 16:23 UTC (permalink / raw)
To: Noralf Trønnes; +Cc: dri-devel, devicetree, thomas.petazzoni, linux-kernel
On Tue, Jan 31, 2017 at 05:03:13PM +0100, Noralf Trønnes wrote:
> 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>
I spotted another tiny one, but yeah looks are supremely reasonable, ack
on all the drm parts. And please send a pull request for all of it as soon
as you have the dt acks.
Cheers, Daniel
> 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..c0a2eb6
> --- /dev/null
> +++ b/drivers/gpu/drm/tinydrm/core/tinydrm-core.c
> @@ -0,0 +1,377 @@
> +/*
> + * 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 kerneldoc DOC here isn't pulled into the .rst. I'd just merge it with
the one below.
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
^ permalink raw reply [flat|nested] 45+ messages in thread* Re: [PATCH v3 1/7] drm: Add DRM support for tiny LCD displays
2017-01-31 16:03 ` [PATCH v3 1/7] drm: Add DRM " Noralf Trønnes
2017-01-31 16:23 ` Daniel Vetter
@ 2017-02-06 9:17 ` Thierry Reding
2017-02-06 19:23 ` Noralf Trønnes
2017-02-06 10:12 ` Jani Nikula
2 siblings, 1 reply; 45+ messages in thread
From: Thierry Reding @ 2017-02-06 9:17 UTC (permalink / raw)
To: Noralf Trønnes; +Cc: thomas.petazzoni, devicetree, linux-kernel, dri-devel
[-- Attachment #1.1: Type: text/plain, Size: 3336 bytes --]
On Tue, Jan 31, 2017 at 05:03:13PM +0100, Noralf Trønnes wrote:
> 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>
> ---
>
> Changes since version 2:
> - Remove fbdev after drm unregister, not before.
>
> Changes since version 1:
> - Add tinydrm.rst
> - Set tdev->fbdev_cma=NULL on unregister (lastclose is called after that).
> - Remove some DRM_DEBUG*()
>
> 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 | 377 ++++++++++++++++++++++++++++
> drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c | 234 +++++++++++++++++
> include/drm/tinydrm/tinydrm.h | 115 +++++++++
> 10 files changed, 763 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
I realize this is totally subjective, but this feels somewhat too much
of a separation. Given the helper nature of TinyDRM, I think it would be
more appropriate to move the helpers themselves into drm_tiny.[ch] and
then maybe add a subdirectory drivers/gpu/drm/tiny that contains all the
drivers that use the helpers.
The separation above further shows in subsequent patches where helpers
are added to tinydrm that aren't specific to TinyDRM. So this make the
new helpers appear as more of a subsystem in DRM rather than a helper
library. It also makes things somewhat inconsistent with existing
infrastructure.
[...]
> +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,
Does this make sense? The helpers and the driver later in this series
suggest that these panels will usually be 16-bit. Wouldn't that be a
more sensible default?
> +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;
Is this really what you wanted? drm_device_is_unplugged() returns true
if the device is in the process of being removed. It only really makes
sense if you also call drm_device_is_unplugged() somewhere in the
driver, usually via drm_unplug_dev(), but I don't see that in the code
which means this will always return false anyway.
Thierry
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^ permalink raw reply [flat|nested] 45+ messages in thread* Re: [PATCH v3 1/7] drm: Add DRM support for tiny LCD displays
2017-02-06 9:17 ` Thierry Reding
@ 2017-02-06 19:23 ` Noralf Trønnes
2017-02-07 6:58 ` Daniel Vetter
0 siblings, 1 reply; 45+ messages in thread
From: Noralf Trønnes @ 2017-02-06 19:23 UTC (permalink / raw)
To: Thierry Reding; +Cc: thomas.petazzoni, devicetree, linux-kernel, dri-devel
Den 06.02.2017 10.17, skrev Thierry Reding:
> On Tue, Jan 31, 2017 at 05:03:13PM +0100, Noralf Trønnes wrote:
>> 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>
>> ---
>>
>> Changes since version 2:
>> - Remove fbdev after drm unregister, not before.
>>
>> Changes since version 1:
>> - Add tinydrm.rst
>> - Set tdev->fbdev_cma=NULL on unregister (lastclose is called after that).
>> - Remove some DRM_DEBUG*()
>>
>> 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 | 377 ++++++++++++++++++++++++++++
>> drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c | 234 +++++++++++++++++
>> include/drm/tinydrm/tinydrm.h | 115 +++++++++
>> 10 files changed, 763 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
> I realize this is totally subjective, but this feels somewhat too much
> of a separation. Given the helper nature of TinyDRM, I think it would be
> more appropriate to move the helpers themselves into drm_tiny.[ch] and
> then maybe add a subdirectory drivers/gpu/drm/tiny that contains all the
> drivers that use the helpers.
>
> The separation above further shows in subsequent patches where helpers
> are added to tinydrm that aren't specific to TinyDRM. So this make the
> new helpers appear as more of a subsystem in DRM rather than a helper
> library. It also makes things somewhat inconsistent with existing
> infrastructure.
What I have done with tinydrm is to do as little as possible in the
core helper. The minimum required to pull together
drm_simple_display_pipe, cma helper + fbdev and framebuffer flushing.
Then I have added a set of functions that ease the writing of drivers
for RGB565 displays with optional backlight and regulator.
Added to that is a controller library that handles register access (will
use regmap for non-mipi) and framebuffer flushing (set the windowing
registers and write the buffer to the pixel register).
And at last there's the display driver that initializes the controller
to match a particular panel.
Maybe I should narrow tinydrm to _just_ support "RGB565 displays with
optional backlight and regulator". It looks like I split it up to much,
unless someone sees a need for the core of tinydrm elsewhere.
I think it's hard to avoid the subsystem smell here. These displays are
really simple, fbdev is more than enough to cover their needs.
But fbdev is closed.
I'm glad you pick on this, as getting the architecture right will save
me maintenance down the line. I did paint me into a corner with
staging/fbtft and I'm not keen on repeating that (to my defence it was
my first C code since university and I had 2 displays that had some
similarities which ended up as fbtft).
Noralf.
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^ permalink raw reply [flat|nested] 45+ messages in thread
* Re: [PATCH v3 1/7] drm: Add DRM support for tiny LCD displays
2017-02-06 19:23 ` Noralf Trønnes
@ 2017-02-07 6:58 ` Daniel Vetter
2017-02-07 11:48 ` Thierry Reding
0 siblings, 1 reply; 45+ messages in thread
From: Daniel Vetter @ 2017-02-07 6:58 UTC (permalink / raw)
To: Noralf Trønnes; +Cc: thomas.petazzoni, devicetree, linux-kernel, dri-devel
On Mon, Feb 06, 2017 at 08:23:36PM +0100, Noralf Trønnes wrote:
>
> Den 06.02.2017 10.17, skrev Thierry Reding:
> > On Tue, Jan 31, 2017 at 05:03:13PM +0100, Noralf Trønnes wrote:
> > > 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>
> > > ---
> > >
> > > Changes since version 2:
> > > - Remove fbdev after drm unregister, not before.
> > >
> > > Changes since version 1:
> > > - Add tinydrm.rst
> > > - Set tdev->fbdev_cma=NULL on unregister (lastclose is called after that).
> > > - Remove some DRM_DEBUG*()
> > >
> > > 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 | 377 ++++++++++++++++++++++++++++
> > > drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c | 234 +++++++++++++++++
> > > include/drm/tinydrm/tinydrm.h | 115 +++++++++
> > > 10 files changed, 763 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
> > I realize this is totally subjective, but this feels somewhat too much
> > of a separation. Given the helper nature of TinyDRM, I think it would be
> > more appropriate to move the helpers themselves into drm_tiny.[ch] and
> > then maybe add a subdirectory drivers/gpu/drm/tiny that contains all the
> > drivers that use the helpers.
> >
> > The separation above further shows in subsequent patches where helpers
> > are added to tinydrm that aren't specific to TinyDRM. So this make the
> > new helpers appear as more of a subsystem in DRM rather than a helper
> > library. It also makes things somewhat inconsistent with existing
> > infrastructure.
>
> What I have done with tinydrm is to do as little as possible in the
> core helper. The minimum required to pull together
> drm_simple_display_pipe, cma helper + fbdev and framebuffer flushing.
>
> Then I have added a set of functions that ease the writing of drivers
> for RGB565 displays with optional backlight and regulator.
>
> Added to that is a controller library that handles register access (will
> use regmap for non-mipi) and framebuffer flushing (set the windowing
> registers and write the buffer to the pixel register).
>
> And at last there's the display driver that initializes the controller
> to match a particular panel.
>
> Maybe I should narrow tinydrm to _just_ support "RGB565 displays with
> optional backlight and regulator". It looks like I split it up to much,
> unless someone sees a need for the core of tinydrm elsewhere.
>
> I think it's hard to avoid the subsystem smell here. These displays are
> really simple, fbdev is more than enough to cover their needs.
> But fbdev is closed.
>
> I'm glad you pick on this, as getting the architecture right will save
> me maintenance down the line. I did paint me into a corner with
> staging/fbtft and I'm not keen on repeating that (to my defence it was
> my first C code since university and I had 2 displays that had some
> similarities which ended up as fbtft).
tbh I'm not sure either whether the tinydrm midlayer is good or not. But
then it is what it says on the tin, i.e. tiny, so not much work to
demidlayer if we notice a clear need for that change. I wouldn't worry
about this for now, but good to keep in mind. In the end, good design is
design that can be changed, because you'll only get it right until the
next unforseen thing happens :-)
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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^ permalink raw reply [flat|nested] 45+ messages in thread
* Re: [PATCH v3 1/7] drm: Add DRM support for tiny LCD displays
2017-02-07 6:58 ` Daniel Vetter
@ 2017-02-07 11:48 ` Thierry Reding
0 siblings, 0 replies; 45+ messages in thread
From: Thierry Reding @ 2017-02-07 11:48 UTC (permalink / raw)
To: Noralf Trønnes, thomas.petazzoni, devicetree, linux-kernel,
dri-devel
[-- Attachment #1.1: Type: text/plain, Size: 4745 bytes --]
On Tue, Feb 07, 2017 at 07:58:52AM +0100, Daniel Vetter wrote:
> On Mon, Feb 06, 2017 at 08:23:36PM +0100, Noralf Trønnes wrote:
> >
> > Den 06.02.2017 10.17, skrev Thierry Reding:
> > > On Tue, Jan 31, 2017 at 05:03:13PM +0100, Noralf Trønnes wrote:
> > > > 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>
> > > > ---
> > > >
> > > > Changes since version 2:
> > > > - Remove fbdev after drm unregister, not before.
> > > >
> > > > Changes since version 1:
> > > > - Add tinydrm.rst
> > > > - Set tdev->fbdev_cma=NULL on unregister (lastclose is called after that).
> > > > - Remove some DRM_DEBUG*()
> > > >
> > > > 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 | 377 ++++++++++++++++++++++++++++
> > > > drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c | 234 +++++++++++++++++
> > > > include/drm/tinydrm/tinydrm.h | 115 +++++++++
> > > > 10 files changed, 763 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
> > > I realize this is totally subjective, but this feels somewhat too much
> > > of a separation. Given the helper nature of TinyDRM, I think it would be
> > > more appropriate to move the helpers themselves into drm_tiny.[ch] and
> > > then maybe add a subdirectory drivers/gpu/drm/tiny that contains all the
> > > drivers that use the helpers.
> > >
> > > The separation above further shows in subsequent patches where helpers
> > > are added to tinydrm that aren't specific to TinyDRM. So this make the
> > > new helpers appear as more of a subsystem in DRM rather than a helper
> > > library. It also makes things somewhat inconsistent with existing
> > > infrastructure.
> >
> > What I have done with tinydrm is to do as little as possible in the
> > core helper. The minimum required to pull together
> > drm_simple_display_pipe, cma helper + fbdev and framebuffer flushing.
> >
> > Then I have added a set of functions that ease the writing of drivers
> > for RGB565 displays with optional backlight and regulator.
> >
> > Added to that is a controller library that handles register access (will
> > use regmap for non-mipi) and framebuffer flushing (set the windowing
> > registers and write the buffer to the pixel register).
> >
> > And at last there's the display driver that initializes the controller
> > to match a particular panel.
> >
> > Maybe I should narrow tinydrm to _just_ support "RGB565 displays with
> > optional backlight and regulator". It looks like I split it up to much,
> > unless someone sees a need for the core of tinydrm elsewhere.
> >
> > I think it's hard to avoid the subsystem smell here. These displays are
> > really simple, fbdev is more than enough to cover their needs.
> > But fbdev is closed.
> >
> > I'm glad you pick on this, as getting the architecture right will save
> > me maintenance down the line. I did paint me into a corner with
> > staging/fbtft and I'm not keen on repeating that (to my defence it was
> > my first C code since university and I had 2 displays that had some
> > similarities which ended up as fbtft).
>
> tbh I'm not sure either whether the tinydrm midlayer is good or not. But
> then it is what it says on the tin, i.e. tiny, so not much work to
> demidlayer if we notice a clear need for that change. I wouldn't worry
> about this for now, but good to keep in mind. In the end, good design is
> design that can be changed, because you'll only get it right until the
> next unforseen thing happens :-)
Agreed, there's nothing in this that couldn't easily be tweaked later
on. It's clearly drm-misc material, too, so even cross-tree dependencies
wouldn't be an issue.
Thierry
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dri-devel@lists.freedesktop.org
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^ permalink raw reply [flat|nested] 45+ messages in thread
* Re: [PATCH v3 1/7] drm: Add DRM support for tiny LCD displays
2017-01-31 16:03 ` [PATCH v3 1/7] drm: Add DRM " Noralf Trønnes
2017-01-31 16:23 ` Daniel Vetter
2017-02-06 9:17 ` Thierry Reding
@ 2017-02-06 10:12 ` Jani Nikula
2 siblings, 0 replies; 45+ messages in thread
From: Jani Nikula @ 2017-02-06 10:12 UTC (permalink / raw)
To: Noralf Trønnes, dri-devel, devicetree; +Cc: thomas.petazzoni, linux-kernel
On Tue, 31 Jan 2017, Noralf Trønnes <noralf@tronnes.org> wrote:
> +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
No need for the ifdefs, drm_compat_ioctl will be defined NULL for
CONFIG_COMPAT=n.
BR,
Jani.
> + .poll = drm_poll,
> + .read = drm_read,
> + .llseek = no_llseek,
> + .mmap = drm_gem_cma_mmap,
> +};
> +EXPORT_SYMBOL(tinydrm_fops);
--
Jani Nikula, Intel Open Source Technology Center
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^ permalink raw reply [flat|nested] 45+ messages in thread
* [PATCH v3 2/7] drm/tinydrm: Add helper functions
2017-01-31 16:03 [PATCH v3 0/7] drm: Add support for tiny LCD displays Noralf Trønnes
2017-01-31 16:03 ` [PATCH v3 1/7] drm: Add DRM " Noralf Trønnes
@ 2017-01-31 16:03 ` Noralf Trønnes
2017-02-06 8:56 ` Thierry Reding
2017-02-06 10:10 ` Jani Nikula
2017-01-31 16:03 ` [PATCH v3 3/7] drm/tinydrm: Add MIPI DBI support Noralf Trønnes
` (5 subsequent siblings)
7 siblings, 2 replies; 45+ messages in thread
From: Noralf Trønnes @ 2017-01-31 16:03 UTC (permalink / raw)
To: dri-devel, devicetree; +Cc: thomas.petazzoni, linux-kernel
Add common functionality needed by many tinydrm drivers.
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
Documentation/gpu/tinydrm.rst | 9 +
drivers/gpu/drm/tinydrm/core/Makefile | 2 +-
drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c | 462 +++++++++++++++++++++++++
include/drm/tinydrm/tinydrm-helpers.h | 100 ++++++
4 files changed, 572 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
create mode 100644 include/drm/tinydrm/tinydrm-helpers.h
diff --git a/Documentation/gpu/tinydrm.rst b/Documentation/gpu/tinydrm.rst
index ec4a20d..fb256d2 100644
--- a/Documentation/gpu/tinydrm.rst
+++ b/Documentation/gpu/tinydrm.rst
@@ -19,3 +19,12 @@ Core functionality
.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
:export:
+
+Additional helpers
+==================
+
+.. kernel-doc:: include/drm/tinydrm/tinydrm-helpers.h
+ :internal:
+
+.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
+ :export:
diff --git a/drivers/gpu/drm/tinydrm/core/Makefile b/drivers/gpu/drm/tinydrm/core/Makefile
index 4f14a0f..fb221e6 100644
--- a/drivers/gpu/drm/tinydrm/core/Makefile
+++ b/drivers/gpu/drm/tinydrm/core/Makefile
@@ -1,3 +1,3 @@
-tinydrm-y := tinydrm-core.o tinydrm-pipe.o
+tinydrm-y := tinydrm-core.o tinydrm-pipe.o tinydrm-helpers.o
obj-$(CONFIG_DRM_TINYDRM) += tinydrm.o
diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
new file mode 100644
index 0000000..75e4e54
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
@@ -0,0 +1,462 @@
+/*
+ * 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/tinydrm/tinydrm.h>
+#include <drm/tinydrm/tinydrm-helpers.h>
+#include <linux/backlight.h>
+#include <linux/pm.h>
+#include <linux/spi/spi.h>
+#include <linux/swab.h>
+
+static unsigned int spi_max;
+module_param(spi_max, uint, 0400);
+MODULE_PARM_DESC(spi_max, "Set a lower SPI max transfer size");
+
+/**
+ * tinydrm_merge_clips - Merge clip rectangles
+ * @dst: Destination clip rectangle
+ * @src: Source clip rectangle(s)
+ * @num_clips: Number of @src clip rectangles
+ * @flags: Dirty fb ioctl flags
+ * @max_width: Maximum width of @dst
+ * @max_height: Maximum height of @dst
+ *
+ * This function merges @src clip rectangle(s) into @dst. If @src is NULL,
+ * @max_width and @min_width is used to set a full @dst clip rectangle.
+ *
+ * Returns:
+ * true if it's a full clip, false otherwise
+ */
+bool tinydrm_merge_clips(struct drm_clip_rect *dst,
+ struct drm_clip_rect *src, unsigned int num_clips,
+ unsigned int flags, u32 max_width, u32 max_height)
+{
+ unsigned int i;
+
+ if (!src || !num_clips) {
+ dst->x1 = 0;
+ dst->x2 = max_width;
+ dst->y1 = 0;
+ dst->y2 = max_height;
+ return true;
+ }
+
+ dst->x1 = ~0;
+ dst->y1 = ~0;
+ dst->x2 = 0;
+ dst->y2 = 0;
+
+ for (i = 0; i < num_clips; i++) {
+ if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY)
+ i++;
+ dst->x1 = min(dst->x1, src[i].x1);
+ dst->x2 = max(dst->x2, src[i].x2);
+ dst->y1 = min(dst->y1, src[i].y1);
+ dst->y2 = max(dst->y2, src[i].y2);
+ }
+
+ if (dst->x2 > max_width || dst->y2 > max_height ||
+ dst->x1 >= dst->x2 || dst->y1 >= dst->y2) {
+ DRM_DEBUG_KMS("Illegal clip: x1=%u, x2=%u, y1=%u, y2=%u\n",
+ dst->x1, dst->x2, dst->y1, dst->y2);
+ dst->x1 = 0;
+ dst->y1 = 0;
+ dst->x2 = max_width;
+ dst->y2 = max_height;
+ }
+
+ return (dst->x2 - dst->x1) == max_width &&
+ (dst->y2 - dst->y1) == max_height;
+}
+EXPORT_SYMBOL(tinydrm_merge_clips);
+
+/**
+ * tinydrm_memcpy - Copy clip buffer
+ * @dst: Destination buffer
+ * @vaddr: Source buffer
+ * @fb: DRM framebuffer
+ * @clip: Clip rectangle area to copy
+ */
+void tinydrm_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb,
+ struct drm_clip_rect *clip)
+{
+ unsigned int cpp = drm_format_plane_cpp(fb->format->format, 0);
+ unsigned int pitch = fb->pitches[0];
+ void *src = vaddr + (clip->y1 * pitch) + (clip->x1 * cpp);
+ size_t len = (clip->x2 - clip->x1) * cpp;
+ unsigned int y;
+
+ for (y = clip->y1; y < clip->y2; y++) {
+ memcpy(dst, src, len);
+ src += pitch;
+ dst += len;
+ }
+}
+EXPORT_SYMBOL(tinydrm_memcpy);
+
+/**
+ * tinydrm_swab16 - Swap bytes into clip buffer
+ * @dst: RGB565 destination buffer
+ * @vaddr: RGB565 source buffer
+ * @fb: DRM framebuffer
+ * @clip: Clip rectangle area to copy
+ */
+void tinydrm_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb,
+ struct drm_clip_rect *clip)
+{
+ size_t len = (clip->x2 - clip->x1) * sizeof(u16);
+ unsigned int x, y;
+ u16 *src, *buf;
+
+ /*
+ * The cma memory is write-combined so reads are uncached.
+ * Speed up by fetching one line at a time.
+ */
+ buf = kmalloc(len, GFP_KERNEL);
+ if (!buf)
+ return;
+
+ for (y = clip->y1; y < clip->y2; y++) {
+ src = vaddr + (y * fb->pitches[0]);
+ src += clip->x1;
+ memcpy(buf, src, len);
+ src = buf;
+ for (x = clip->x1; x < clip->x2; x++)
+ *dst++ = swab16(*src++);
+ }
+
+ kfree(buf);
+}
+EXPORT_SYMBOL(tinydrm_swab16);
+
+/**
+ * tinydrm_xrgb8888_to_rgb565 - Convert XRGB8888 to RGB565 clip buffer
+ * @dst: RGB565 destination buffer
+ * @vaddr: XRGB8888 source buffer
+ * @fb: DRM framebuffer
+ * @clip: Clip rectangle area to copy
+ * @swap: Swap bytes
+ *
+ * Drivers can use this function for RGB565 devices that don't natively
+ * support XRGB8888.
+ */
+void tinydrm_xrgb8888_to_rgb565(u16 *dst, void *vaddr,
+ struct drm_framebuffer *fb,
+ struct drm_clip_rect *clip, bool swap)
+{
+ size_t len = (clip->x2 - clip->x1) * sizeof(u32);
+ unsigned int x, y;
+ u32 *src, *buf;
+ u16 val16;
+
+ buf = kmalloc(len, GFP_KERNEL);
+ if (!buf)
+ return;
+
+ for (y = clip->y1; y < clip->y2; y++) {
+ src = vaddr + (y * fb->pitches[0]);
+ src += clip->x1;
+ memcpy(buf, src, len);
+ src = buf;
+ for (x = clip->x1; x < clip->x2; x++) {
+ val16 = ((*src & 0x00F80000) >> 8) |
+ ((*src & 0x0000FC00) >> 5) |
+ ((*src & 0x000000F8) >> 3);
+ src++;
+ if (swap)
+ *dst++ = swab16(val16);
+ else
+ *dst++ = val16;
+ }
+ }
+
+ kfree(buf);
+}
+EXPORT_SYMBOL(tinydrm_xrgb8888_to_rgb565);
+
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+/**
+ * tinydrm_of_find_backlight - Find backlight device in device-tree
+ * @dev: Device
+ *
+ * This function looks for a DT node pointed to by a property named 'backlight'
+ * and uses of_find_backlight_by_node() to get the backlight device.
+ * Additionally if the brightness property is zero, it is set to
+ * max_brightness.
+ *
+ * Returns:
+ * NULL if there's no backlight property.
+ * Error pointer -EPROBE_DEFER if the DT node is found, but no backlight device
+ * is found.
+ * If the backlight device is found, a pointer to the structure is returned.
+ */
+struct backlight_device *tinydrm_of_find_backlight(struct device *dev)
+{
+ struct backlight_device *backlight;
+ struct device_node *np;
+
+ np = of_parse_phandle(dev->of_node, "backlight", 0);
+ if (!np)
+ return NULL;
+
+ backlight = of_find_backlight_by_node(np);
+ of_node_put(np);
+
+ if (!backlight)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ if (!backlight->props.brightness) {
+ backlight->props.brightness = backlight->props.max_brightness;
+ DRM_DEBUG_KMS("Backlight brightness set to %d\n",
+ backlight->props.brightness);
+ }
+
+ return backlight;
+}
+EXPORT_SYMBOL(tinydrm_of_find_backlight);
+
+/**
+ * tinydrm_enable_backlight - Enable backlight helper
+ * @backlight: Backlight device
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int tinydrm_enable_backlight(struct backlight_device *backlight)
+{
+ unsigned int old_state;
+ int ret;
+
+ if (!backlight)
+ return 0;
+
+ old_state = backlight->props.state;
+ backlight->props.state &= ~BL_CORE_FBBLANK;
+ DRM_DEBUG_KMS("Backlight state: 0x%x -> 0x%x\n", old_state,
+ backlight->props.state);
+
+ ret = backlight_update_status(backlight);
+ if (ret)
+ DRM_ERROR("Failed to enable backlight %d\n", ret);
+
+ return ret;
+}
+EXPORT_SYMBOL(tinydrm_enable_backlight);
+
+/**
+ * tinydrm_disable_backlight - Disable backlight helper
+ * @backlight: Backlight device
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int tinydrm_disable_backlight(struct backlight_device *backlight)
+{
+ unsigned int old_state;
+ int ret;
+
+ if (!backlight)
+ return 0;
+
+ old_state = backlight->props.state;
+ backlight->props.state |= BL_CORE_FBBLANK;
+ DRM_DEBUG_KMS("Backlight state: 0x%x -> 0x%x\n", old_state,
+ backlight->props.state);
+ ret = backlight_update_status(backlight);
+ if (ret)
+ DRM_ERROR("Failed to disable backlight %d\n", ret);
+
+ return ret;
+}
+EXPORT_SYMBOL(tinydrm_disable_backlight);
+#endif
+
+#ifdef CONFIG_SPI
+
+/**
+ * tinydrm_spi_max_transfer_size - Determine max SPI transfer size
+ * @spi: SPI device
+ * @max_len: Maximum buffer size needed (optional)
+ *
+ * This function returns the maximum size to use for SPI transfers. It checks
+ * the SPI master, the optional @max_len and the module parameter spi_max and
+ * returns the smallest.
+ *
+ * Returns:
+ * Maximum size for SPI transfers
+ */
+size_t tinydrm_spi_max_transfer_size(struct spi_device *spi, size_t max_len)
+{
+ size_t ret;
+
+ ret = min(spi_max_transfer_size(spi), spi->master->max_dma_len);
+ if (max_len)
+ ret = min(ret, max_len);
+ if (spi_max)
+ ret = min_t(size_t, ret, spi_max);
+ ret &= ~0x3;
+ if (ret < 4)
+ ret = 4;
+
+ return ret;
+}
+EXPORT_SYMBOL(tinydrm_spi_max_transfer_size);
+
+/**
+ * tinydrm_spi_bpw_supported - Check if bits per word is supported
+ * @spi: SPI device
+ * @bpw: Bits per word
+ *
+ * This function checks to see if the SPI master driver supports @bpw.
+ *
+ * Returns:
+ * True if @bpw is supported, false otherwise.
+ */
+bool tinydrm_spi_bpw_supported(struct spi_device *spi, u8 bpw)
+{
+ u32 bpw_mask = spi->master->bits_per_word_mask;
+
+ if (bpw == 8)
+ return true;
+
+ if (!bpw_mask) {
+ dev_warn_once(&spi->dev,
+ "bits_per_word_mask not set, assume 8-bit only\n");
+ return false;
+ }
+
+ if (bpw_mask & SPI_BPW_MASK(bpw))
+ return true;
+
+ return false;
+}
+EXPORT_SYMBOL(tinydrm_spi_bpw_supported);
+
+static void
+tinydrm_dbg_spi_print(struct spi_device *spi, struct spi_transfer *tr,
+ const void *buf, int idx, bool tx)
+{
+ u32 speed_hz = tr->speed_hz ? tr->speed_hz : spi->max_speed_hz;
+ char linebuf[3 * 32];
+
+ hex_dump_to_buffer(buf, tr->len, 16,
+ DIV_ROUND_UP(tr->bits_per_word, 8),
+ linebuf, sizeof(linebuf), false);
+
+ printk(KERN_DEBUG
+ " tr(%i): speed=%u%s, bpw=%i, len=%u, %s_buf=[%s%s]\n", idx,
+ speed_hz > 1000000 ? speed_hz / 1000000 : speed_hz / 1000,
+ speed_hz > 1000000 ? "MHz" : "kHz", tr->bits_per_word, tr->len,
+ tx ? "tx" : "rx", linebuf, tr->len > 16 ? " ..." : "");
+}
+
+/* called through tinydrm_dbg_spi_message() */
+void _tinydrm_dbg_spi_message(struct spi_device *spi, struct spi_message *m)
+{
+ struct spi_transfer *tmp;
+ struct list_head *pos;
+ int i = 0;
+
+ list_for_each(pos, &m->transfers) {
+ tmp = list_entry(pos, struct spi_transfer, transfer_list);
+
+ if (tmp->tx_buf)
+ tinydrm_dbg_spi_print(spi, tmp, tmp->tx_buf, i, true);
+ if (tmp->rx_buf)
+ tinydrm_dbg_spi_print(spi, tmp, tmp->rx_buf, i, false);
+ i++;
+ }
+}
+EXPORT_SYMBOL(_tinydrm_dbg_spi_message);
+
+/**
+ * tinydrm_spi_transfer - SPI transfer helper
+ * @spi: SPI device
+ * @speed_hz: Override speed (optional)
+ * @header: Optional header transfer
+ * @bpw: Bits per word
+ * @buf: Buffer to transfer
+ * @len: Buffer length
+ *
+ * This SPI transfer helper breaks up the transfer of @buf into chunks which
+ * the SPI master driver can handle. If the machine is Little Endian and the
+ * SPI master driver doesn't support 16 bits per word, it swaps the bytes and
+ * does a 8-bit transfer.
+ * If @header is set, it is prepended to each SPI message.
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int tinydrm_spi_transfer(struct spi_device *spi, u32 speed_hz,
+ struct spi_transfer *header, u8 bpw, const void *buf,
+ size_t len)
+{
+ struct spi_transfer tr = {
+ .bits_per_word = bpw,
+ .speed_hz = speed_hz,
+ };
+ struct spi_message m;
+ u16 *swap_buf = NULL;
+ size_t max_chunk;
+ size_t chunk;
+ int ret = 0;
+
+ if (WARN_ON_ONCE(bpw != 8 && bpw != 16))
+ return -EINVAL;
+
+ max_chunk = tinydrm_spi_max_transfer_size(spi, 0);
+
+ if (drm_debug & DRM_UT_DRIVER)
+ pr_debug("[drm:%s] bpw=%u, max_chunk=%zu, transfers:\n",
+ __func__, bpw, max_chunk);
+
+ if (bpw == 16 && !tinydrm_spi_bpw_supported(spi, 16)) {
+ tr.bits_per_word = 8;
+ if (tinydrm_machine_little_endian()) {
+ swap_buf = kmalloc(min(len, max_chunk), GFP_KERNEL);
+ if (!swap_buf)
+ return -ENOMEM;
+ }
+ }
+
+ spi_message_init(&m);
+ if (header)
+ spi_message_add_tail(header, &m);
+ spi_message_add_tail(&tr, &m);
+
+ while (len) {
+ chunk = min(len, max_chunk);
+
+ tr.tx_buf = buf;
+ tr.len = chunk;
+
+ if (swap_buf) {
+ const u16 *buf16 = buf;
+ unsigned int i;
+
+ for (i = 0; i < chunk / 2; i++)
+ swap_buf[i] = swab16(buf16[i]);
+
+ tr.tx_buf = swap_buf;
+ }
+
+ buf += chunk;
+ len -= chunk;
+
+ tinydrm_dbg_spi_message(spi, &m);
+ ret = spi_sync(spi, &m);
+ if (ret)
+ return ret;
+ };
+
+ return 0;
+}
+EXPORT_SYMBOL(tinydrm_spi_transfer);
+
+#endif /* CONFIG_SPI */
diff --git a/include/drm/tinydrm/tinydrm-helpers.h b/include/drm/tinydrm/tinydrm-helpers.h
new file mode 100644
index 0000000..78175fe
--- /dev/null
+++ b/include/drm/tinydrm/tinydrm-helpers.h
@@ -0,0 +1,100 @@
+/*
+ * 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_HELPERS_H
+#define __LINUX_TINYDRM_HELPERS_H
+
+struct backlight_device;
+struct tinydrm_device;
+struct drm_clip_rect;
+struct spi_transfer;
+struct spi_message;
+struct spi_device;
+struct device;
+
+/**
+ * tinydrm_machine_little_endian - Machine is little endian
+ *
+ * Returns:
+ * true if *defined(__LITTLE_ENDIAN)*, false otherwise
+ */
+static inline bool tinydrm_machine_little_endian(void)
+{
+#if defined(__LITTLE_ENDIAN)
+ return true;
+#else
+ return false;
+#endif
+}
+
+bool tinydrm_merge_clips(struct drm_clip_rect *dst,
+ struct drm_clip_rect *src, unsigned int num_clips,
+ unsigned int flags, u32 max_width, u32 max_height);
+void tinydrm_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb,
+ struct drm_clip_rect *clip);
+void tinydrm_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb,
+ struct drm_clip_rect *clip);
+void tinydrm_xrgb8888_to_rgb565(u16 *dst, void *vaddr,
+ struct drm_framebuffer *fb,
+ struct drm_clip_rect *clip, bool swap);
+
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+struct backlight_device *tinydrm_of_find_backlight(struct device *dev);
+int tinydrm_enable_backlight(struct backlight_device *backlight);
+int tinydrm_disable_backlight(struct backlight_device *backlight);
+#else
+static inline struct backlight_device *
+tinydrm_of_find_backlight(struct device *dev)
+{
+ return NULL;
+}
+
+static inline int tinydrm_enable_backlight(struct backlight_device *backlight)
+{
+ return 0;
+}
+
+static inline int
+tinydrm_disable_backlight(struct backlight_device *backlight)
+{
+ return 0;
+}
+#endif
+
+size_t tinydrm_spi_max_transfer_size(struct spi_device *spi, size_t max_len);
+bool tinydrm_spi_bpw_supported(struct spi_device *spi, u8 bpw);
+int tinydrm_spi_transfer(struct spi_device *spi, u32 speed_hz,
+ struct spi_transfer *header, u8 bpw, const void *buf,
+ size_t len);
+void _tinydrm_dbg_spi_message(struct spi_device *spi, struct spi_message *m);
+
+#ifdef DEBUG
+/**
+ * tinydrm_dbg_spi_message - Dump SPI message
+ * @spi: SPI device
+ * @m: SPI message
+ *
+ * Dumps info about the transfers in a SPI message including buffer content.
+ * DEBUG has to be defined for this function to be enabled alongside setting
+ * the DRM_UT_DRIVER bit of &drm_debug.
+ */
+static inline void tinydrm_dbg_spi_message(struct spi_device *spi,
+ struct spi_message *m)
+{
+ if (drm_debug & DRM_UT_DRIVER)
+ _tinydrm_dbg_spi_message(spi, m);
+}
+#else
+static inline void tinydrm_dbg_spi_message(struct spi_device *spi,
+ struct spi_message *m)
+{
+}
+#endif /* DEBUG */
+
+#endif /* __LINUX_TINYDRM_HELPERS_H */
--
2.10.2
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^ permalink raw reply related [flat|nested] 45+ messages in thread* Re: [PATCH v3 2/7] drm/tinydrm: Add helper functions
2017-01-31 16:03 ` [PATCH v3 2/7] drm/tinydrm: Add helper functions Noralf Trønnes
@ 2017-02-06 8:56 ` Thierry Reding
2017-02-06 9:09 ` Daniel Vetter
2017-02-06 10:10 ` Jani Nikula
1 sibling, 1 reply; 45+ messages in thread
From: Thierry Reding @ 2017-02-06 8:56 UTC (permalink / raw)
To: Noralf Trønnes; +Cc: thomas.petazzoni, devicetree, linux-kernel, dri-devel
[-- Attachment #1.1: Type: text/plain, Size: 12575 bytes --]
On Tue, Jan 31, 2017 at 05:03:14PM +0100, Noralf Trønnes wrote:
> Add common functionality needed by many tinydrm drivers.
>
> Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> ---
> Documentation/gpu/tinydrm.rst | 9 +
> drivers/gpu/drm/tinydrm/core/Makefile | 2 +-
> drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c | 462 +++++++++++++++++++++++++
> include/drm/tinydrm/tinydrm-helpers.h | 100 ++++++
> 4 files changed, 572 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
> create mode 100644 include/drm/tinydrm/tinydrm-helpers.h
>
> diff --git a/Documentation/gpu/tinydrm.rst b/Documentation/gpu/tinydrm.rst
> index ec4a20d..fb256d2 100644
> --- a/Documentation/gpu/tinydrm.rst
> +++ b/Documentation/gpu/tinydrm.rst
> @@ -19,3 +19,12 @@ Core functionality
>
> .. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
> :export:
> +
> +Additional helpers
> +==================
> +
> +.. kernel-doc:: include/drm/tinydrm/tinydrm-helpers.h
> + :internal:
> +
> +.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
> + :export:
> diff --git a/drivers/gpu/drm/tinydrm/core/Makefile b/drivers/gpu/drm/tinydrm/core/Makefile
> index 4f14a0f..fb221e6 100644
> --- a/drivers/gpu/drm/tinydrm/core/Makefile
> +++ b/drivers/gpu/drm/tinydrm/core/Makefile
> @@ -1,3 +1,3 @@
> -tinydrm-y := tinydrm-core.o tinydrm-pipe.o
> +tinydrm-y := tinydrm-core.o tinydrm-pipe.o tinydrm-helpers.o
>
> obj-$(CONFIG_DRM_TINYDRM) += tinydrm.o
> diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
> new file mode 100644
> index 0000000..75e4e54
> --- /dev/null
> +++ b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
> @@ -0,0 +1,462 @@
> +/*
> + * 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/tinydrm/tinydrm.h>
> +#include <drm/tinydrm/tinydrm-helpers.h>
> +#include <linux/backlight.h>
> +#include <linux/pm.h>
> +#include <linux/spi/spi.h>
> +#include <linux/swab.h>
> +
> +static unsigned int spi_max;
> +module_param(spi_max, uint, 0400);
> +MODULE_PARM_DESC(spi_max, "Set a lower SPI max transfer size");
> +
> +/**
> + * tinydrm_merge_clips - Merge clip rectangles
> + * @dst: Destination clip rectangle
> + * @src: Source clip rectangle(s)
> + * @num_clips: Number of @src clip rectangles
> + * @flags: Dirty fb ioctl flags
> + * @max_width: Maximum width of @dst
> + * @max_height: Maximum height of @dst
> + *
> + * This function merges @src clip rectangle(s) into @dst. If @src is NULL,
> + * @max_width and @min_width is used to set a full @dst clip rectangle.
> + *
> + * Returns:
> + * true if it's a full clip, false otherwise
> + */
> +bool tinydrm_merge_clips(struct drm_clip_rect *dst,
> + struct drm_clip_rect *src, unsigned int num_clips,
> + unsigned int flags, u32 max_width, u32 max_height)
> +{
> + unsigned int i;
> +
> + if (!src || !num_clips) {
> + dst->x1 = 0;
> + dst->x2 = max_width;
> + dst->y1 = 0;
> + dst->y2 = max_height;
> + return true;
> + }
> +
> + dst->x1 = ~0;
> + dst->y1 = ~0;
> + dst->x2 = 0;
> + dst->y2 = 0;
> +
> + for (i = 0; i < num_clips; i++) {
> + if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY)
> + i++;
> + dst->x1 = min(dst->x1, src[i].x1);
> + dst->x2 = max(dst->x2, src[i].x2);
> + dst->y1 = min(dst->y1, src[i].y1);
> + dst->y2 = max(dst->y2, src[i].y2);
> + }
> +
> + if (dst->x2 > max_width || dst->y2 > max_height ||
> + dst->x1 >= dst->x2 || dst->y1 >= dst->y2) {
> + DRM_DEBUG_KMS("Illegal clip: x1=%u, x2=%u, y1=%u, y2=%u\n",
> + dst->x1, dst->x2, dst->y1, dst->y2);
> + dst->x1 = 0;
> + dst->y1 = 0;
> + dst->x2 = max_width;
> + dst->y2 = max_height;
> + }
> +
> + return (dst->x2 - dst->x1) == max_width &&
> + (dst->y2 - dst->y1) == max_height;
> +}
> +EXPORT_SYMBOL(tinydrm_merge_clips);
Should this perhaps be part of drm_rect.c?
> +#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
> +/**
> + * tinydrm_of_find_backlight - Find backlight device in device-tree
> + * @dev: Device
> + *
> + * This function looks for a DT node pointed to by a property named 'backlight'
> + * and uses of_find_backlight_by_node() to get the backlight device.
> + * Additionally if the brightness property is zero, it is set to
> + * max_brightness.
> + *
> + * Returns:
> + * NULL if there's no backlight property.
> + * Error pointer -EPROBE_DEFER if the DT node is found, but no backlight device
> + * is found.
> + * If the backlight device is found, a pointer to the structure is returned.
> + */
> +struct backlight_device *tinydrm_of_find_backlight(struct device *dev)
> +{
> + struct backlight_device *backlight;
> + struct device_node *np;
> +
> + np = of_parse_phandle(dev->of_node, "backlight", 0);
> + if (!np)
> + return NULL;
> +
> + backlight = of_find_backlight_by_node(np);
> + of_node_put(np);
> +
> + if (!backlight)
> + return ERR_PTR(-EPROBE_DEFER);
> +
> + if (!backlight->props.brightness) {
> + backlight->props.brightness = backlight->props.max_brightness;
> + DRM_DEBUG_KMS("Backlight brightness set to %d\n",
> + backlight->props.brightness);
> + }
> +
> + return backlight;
> +}
> +EXPORT_SYMBOL(tinydrm_of_find_backlight);
> +
> +/**
> + * tinydrm_enable_backlight - Enable backlight helper
> + * @backlight: Backlight device
> + *
> + * Returns:
> + * Zero on success, negative error code on failure.
> + */
> +int tinydrm_enable_backlight(struct backlight_device *backlight)
> +{
> + unsigned int old_state;
> + int ret;
> +
> + if (!backlight)
> + return 0;
> +
> + old_state = backlight->props.state;
> + backlight->props.state &= ~BL_CORE_FBBLANK;
> + DRM_DEBUG_KMS("Backlight state: 0x%x -> 0x%x\n", old_state,
> + backlight->props.state);
> +
> + ret = backlight_update_status(backlight);
> + if (ret)
> + DRM_ERROR("Failed to enable backlight %d\n", ret);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(tinydrm_enable_backlight);
> +
> +/**
> + * tinydrm_disable_backlight - Disable backlight helper
> + * @backlight: Backlight device
> + *
> + * Returns:
> + * Zero on success, negative error code on failure.
> + */
> +int tinydrm_disable_backlight(struct backlight_device *backlight)
> +{
> + unsigned int old_state;
> + int ret;
> +
> + if (!backlight)
> + return 0;
> +
> + old_state = backlight->props.state;
> + backlight->props.state |= BL_CORE_FBBLANK;
> + DRM_DEBUG_KMS("Backlight state: 0x%x -> 0x%x\n", old_state,
> + backlight->props.state);
> + ret = backlight_update_status(backlight);
> + if (ret)
> + DRM_ERROR("Failed to disable backlight %d\n", ret);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(tinydrm_disable_backlight);
> +#endif
These look like they really should be part of the backlight subsystem. I
don't see anything DRM specific about them. Well, except for the error
messages.
> +#ifdef CONFIG_SPI
> +
> +/**
> + * tinydrm_spi_max_transfer_size - Determine max SPI transfer size
> + * @spi: SPI device
> + * @max_len: Maximum buffer size needed (optional)
> + *
> + * This function returns the maximum size to use for SPI transfers. It checks
> + * the SPI master, the optional @max_len and the module parameter spi_max and
> + * returns the smallest.
> + *
> + * Returns:
> + * Maximum size for SPI transfers
> + */
> +size_t tinydrm_spi_max_transfer_size(struct spi_device *spi, size_t max_len)
> +{
> + size_t ret;
> +
> + ret = min(spi_max_transfer_size(spi), spi->master->max_dma_len);
> + if (max_len)
> + ret = min(ret, max_len);
> + if (spi_max)
> + ret = min_t(size_t, ret, spi_max);
> + ret &= ~0x3;
> + if (ret < 4)
> + ret = 4;
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(tinydrm_spi_max_transfer_size);
> +
> +/**
> + * tinydrm_spi_bpw_supported - Check if bits per word is supported
> + * @spi: SPI device
> + * @bpw: Bits per word
> + *
> + * This function checks to see if the SPI master driver supports @bpw.
> + *
> + * Returns:
> + * True if @bpw is supported, false otherwise.
> + */
> +bool tinydrm_spi_bpw_supported(struct spi_device *spi, u8 bpw)
> +{
> + u32 bpw_mask = spi->master->bits_per_word_mask;
> +
> + if (bpw == 8)
> + return true;
> +
> + if (!bpw_mask) {
> + dev_warn_once(&spi->dev,
> + "bits_per_word_mask not set, assume 8-bit only\n");
> + return false;
> + }
> +
> + if (bpw_mask & SPI_BPW_MASK(bpw))
> + return true;
> +
> + return false;
> +}
> +EXPORT_SYMBOL(tinydrm_spi_bpw_supported);
> +
> +static void
> +tinydrm_dbg_spi_print(struct spi_device *spi, struct spi_transfer *tr,
> + const void *buf, int idx, bool tx)
> +{
> + u32 speed_hz = tr->speed_hz ? tr->speed_hz : spi->max_speed_hz;
> + char linebuf[3 * 32];
> +
> + hex_dump_to_buffer(buf, tr->len, 16,
> + DIV_ROUND_UP(tr->bits_per_word, 8),
> + linebuf, sizeof(linebuf), false);
> +
> + printk(KERN_DEBUG
> + " tr(%i): speed=%u%s, bpw=%i, len=%u, %s_buf=[%s%s]\n", idx,
> + speed_hz > 1000000 ? speed_hz / 1000000 : speed_hz / 1000,
> + speed_hz > 1000000 ? "MHz" : "kHz", tr->bits_per_word, tr->len,
> + tx ? "tx" : "rx", linebuf, tr->len > 16 ? " ..." : "");
> +}
> +
> +/* called through tinydrm_dbg_spi_message() */
> +void _tinydrm_dbg_spi_message(struct spi_device *spi, struct spi_message *m)
> +{
> + struct spi_transfer *tmp;
> + struct list_head *pos;
> + int i = 0;
> +
> + list_for_each(pos, &m->transfers) {
> + tmp = list_entry(pos, struct spi_transfer, transfer_list);
> +
> + if (tmp->tx_buf)
> + tinydrm_dbg_spi_print(spi, tmp, tmp->tx_buf, i, true);
> + if (tmp->rx_buf)
> + tinydrm_dbg_spi_print(spi, tmp, tmp->rx_buf, i, false);
> + i++;
> + }
> +}
> +EXPORT_SYMBOL(_tinydrm_dbg_spi_message);
> +
> +/**
> + * tinydrm_spi_transfer - SPI transfer helper
> + * @spi: SPI device
> + * @speed_hz: Override speed (optional)
> + * @header: Optional header transfer
> + * @bpw: Bits per word
> + * @buf: Buffer to transfer
> + * @len: Buffer length
> + *
> + * This SPI transfer helper breaks up the transfer of @buf into chunks which
> + * the SPI master driver can handle. If the machine is Little Endian and the
> + * SPI master driver doesn't support 16 bits per word, it swaps the bytes and
> + * does a 8-bit transfer.
> + * If @header is set, it is prepended to each SPI message.
> + *
> + * Returns:
> + * Zero on success, negative error code on failure.
> + */
> +int tinydrm_spi_transfer(struct spi_device *spi, u32 speed_hz,
> + struct spi_transfer *header, u8 bpw, const void *buf,
> + size_t len)
> +{
> + struct spi_transfer tr = {
> + .bits_per_word = bpw,
> + .speed_hz = speed_hz,
> + };
> + struct spi_message m;
> + u16 *swap_buf = NULL;
> + size_t max_chunk;
> + size_t chunk;
> + int ret = 0;
> +
> + if (WARN_ON_ONCE(bpw != 8 && bpw != 16))
> + return -EINVAL;
> +
> + max_chunk = tinydrm_spi_max_transfer_size(spi, 0);
> +
> + if (drm_debug & DRM_UT_DRIVER)
> + pr_debug("[drm:%s] bpw=%u, max_chunk=%zu, transfers:\n",
> + __func__, bpw, max_chunk);
> +
> + if (bpw == 16 && !tinydrm_spi_bpw_supported(spi, 16)) {
> + tr.bits_per_word = 8;
> + if (tinydrm_machine_little_endian()) {
> + swap_buf = kmalloc(min(len, max_chunk), GFP_KERNEL);
> + if (!swap_buf)
> + return -ENOMEM;
> + }
> + }
> +
> + spi_message_init(&m);
> + if (header)
> + spi_message_add_tail(header, &m);
> + spi_message_add_tail(&tr, &m);
> +
> + while (len) {
> + chunk = min(len, max_chunk);
> +
> + tr.tx_buf = buf;
> + tr.len = chunk;
> +
> + if (swap_buf) {
> + const u16 *buf16 = buf;
> + unsigned int i;
> +
> + for (i = 0; i < chunk / 2; i++)
> + swap_buf[i] = swab16(buf16[i]);
> +
> + tr.tx_buf = swap_buf;
> + }
> +
> + buf += chunk;
> + len -= chunk;
> +
> + tinydrm_dbg_spi_message(spi, &m);
> + ret = spi_sync(spi, &m);
> + if (ret)
> + return ret;
> + };
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(tinydrm_spi_transfer);
Similarly for the above.
Thierry
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^ permalink raw reply [flat|nested] 45+ messages in thread* Re: [PATCH v3 2/7] drm/tinydrm: Add helper functions
2017-02-06 8:56 ` Thierry Reding
@ 2017-02-06 9:09 ` Daniel Vetter
[not found] ` <20170206090918.6rqr6l7pd62znl5j-dv86pmgwkMBes7Z6vYuT8azUEOm+Xw19@public.gmane.org>
0 siblings, 1 reply; 45+ messages in thread
From: Daniel Vetter @ 2017-02-06 9:09 UTC (permalink / raw)
To: Thierry Reding; +Cc: thomas.petazzoni, devicetree, linux-kernel, dri-devel
On Mon, Feb 06, 2017 at 09:56:29AM +0100, Thierry Reding wrote:
> On Tue, Jan 31, 2017 at 05:03:14PM +0100, Noralf Trønnes wrote:
> > Add common functionality needed by many tinydrm drivers.
> >
> > Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
> > Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> > ---
> > Documentation/gpu/tinydrm.rst | 9 +
> > drivers/gpu/drm/tinydrm/core/Makefile | 2 +-
> > drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c | 462 +++++++++++++++++++++++++
> > include/drm/tinydrm/tinydrm-helpers.h | 100 ++++++
> > 4 files changed, 572 insertions(+), 1 deletion(-)
> > create mode 100644 drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
> > create mode 100644 include/drm/tinydrm/tinydrm-helpers.h
> >
> > diff --git a/Documentation/gpu/tinydrm.rst b/Documentation/gpu/tinydrm.rst
> > index ec4a20d..fb256d2 100644
> > --- a/Documentation/gpu/tinydrm.rst
> > +++ b/Documentation/gpu/tinydrm.rst
> > @@ -19,3 +19,12 @@ Core functionality
> >
> > .. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
> > :export:
> > +
> > +Additional helpers
> > +==================
> > +
> > +.. kernel-doc:: include/drm/tinydrm/tinydrm-helpers.h
> > + :internal:
> > +
> > +.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
> > + :export:
> > diff --git a/drivers/gpu/drm/tinydrm/core/Makefile b/drivers/gpu/drm/tinydrm/core/Makefile
> > index 4f14a0f..fb221e6 100644
> > --- a/drivers/gpu/drm/tinydrm/core/Makefile
> > +++ b/drivers/gpu/drm/tinydrm/core/Makefile
> > @@ -1,3 +1,3 @@
> > -tinydrm-y := tinydrm-core.o tinydrm-pipe.o
> > +tinydrm-y := tinydrm-core.o tinydrm-pipe.o tinydrm-helpers.o
> >
> > obj-$(CONFIG_DRM_TINYDRM) += tinydrm.o
> > diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
> > new file mode 100644
> > index 0000000..75e4e54
> > --- /dev/null
> > +++ b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
> > @@ -0,0 +1,462 @@
> > +/*
> > + * 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/tinydrm/tinydrm.h>
> > +#include <drm/tinydrm/tinydrm-helpers.h>
> > +#include <linux/backlight.h>
> > +#include <linux/pm.h>
> > +#include <linux/spi/spi.h>
> > +#include <linux/swab.h>
> > +
> > +static unsigned int spi_max;
> > +module_param(spi_max, uint, 0400);
> > +MODULE_PARM_DESC(spi_max, "Set a lower SPI max transfer size");
> > +
> > +/**
> > + * tinydrm_merge_clips - Merge clip rectangles
> > + * @dst: Destination clip rectangle
> > + * @src: Source clip rectangle(s)
> > + * @num_clips: Number of @src clip rectangles
> > + * @flags: Dirty fb ioctl flags
> > + * @max_width: Maximum width of @dst
> > + * @max_height: Maximum height of @dst
> > + *
> > + * This function merges @src clip rectangle(s) into @dst. If @src is NULL,
> > + * @max_width and @min_width is used to set a full @dst clip rectangle.
> > + *
> > + * Returns:
> > + * true if it's a full clip, false otherwise
> > + */
> > +bool tinydrm_merge_clips(struct drm_clip_rect *dst,
> > + struct drm_clip_rect *src, unsigned int num_clips,
> > + unsigned int flags, u32 max_width, u32 max_height)
> > +{
> > + unsigned int i;
> > +
> > + if (!src || !num_clips) {
> > + dst->x1 = 0;
> > + dst->x2 = max_width;
> > + dst->y1 = 0;
> > + dst->y2 = max_height;
> > + return true;
> > + }
> > +
> > + dst->x1 = ~0;
> > + dst->y1 = ~0;
> > + dst->x2 = 0;
> > + dst->y2 = 0;
> > +
> > + for (i = 0; i < num_clips; i++) {
> > + if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY)
> > + i++;
> > + dst->x1 = min(dst->x1, src[i].x1);
> > + dst->x2 = max(dst->x2, src[i].x2);
> > + dst->y1 = min(dst->y1, src[i].y1);
> > + dst->y2 = max(dst->y2, src[i].y2);
> > + }
> > +
> > + if (dst->x2 > max_width || dst->y2 > max_height ||
> > + dst->x1 >= dst->x2 || dst->y1 >= dst->y2) {
> > + DRM_DEBUG_KMS("Illegal clip: x1=%u, x2=%u, y1=%u, y2=%u\n",
> > + dst->x1, dst->x2, dst->y1, dst->y2);
> > + dst->x1 = 0;
> > + dst->y1 = 0;
> > + dst->x2 = max_width;
> > + dst->y2 = max_height;
> > + }
> > +
> > + return (dst->x2 - dst->x1) == max_width &&
> > + (dst->y2 - dst->y1) == max_height;
> > +}
> > +EXPORT_SYMBOL(tinydrm_merge_clips);
>
> Should this perhaps be part of drm_rect.c?
drm_rect is about struct drm_rect, this here is struct drm_clip_rect. I
think fixing this up is a lot bigger patch series, and we've postponed it
already with the dirtyfb trakcing patches for the fbdev helpers. I think
postponing once more is ok.
> > +#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
> > +/**
> > + * tinydrm_of_find_backlight - Find backlight device in device-tree
> > + * @dev: Device
> > + *
> > + * This function looks for a DT node pointed to by a property named 'backlight'
> > + * and uses of_find_backlight_by_node() to get the backlight device.
> > + * Additionally if the brightness property is zero, it is set to
> > + * max_brightness.
> > + *
> > + * Returns:
> > + * NULL if there's no backlight property.
> > + * Error pointer -EPROBE_DEFER if the DT node is found, but no backlight device
> > + * is found.
> > + * If the backlight device is found, a pointer to the structure is returned.
> > + */
> > +struct backlight_device *tinydrm_of_find_backlight(struct device *dev)
> > +{
> > + struct backlight_device *backlight;
> > + struct device_node *np;
> > +
> > + np = of_parse_phandle(dev->of_node, "backlight", 0);
> > + if (!np)
> > + return NULL;
> > +
> > + backlight = of_find_backlight_by_node(np);
> > + of_node_put(np);
> > +
> > + if (!backlight)
> > + return ERR_PTR(-EPROBE_DEFER);
> > +
> > + if (!backlight->props.brightness) {
> > + backlight->props.brightness = backlight->props.max_brightness;
> > + DRM_DEBUG_KMS("Backlight brightness set to %d\n",
> > + backlight->props.brightness);
> > + }
> > +
> > + return backlight;
> > +}
> > +EXPORT_SYMBOL(tinydrm_of_find_backlight);
> > +
> > +/**
> > + * tinydrm_enable_backlight - Enable backlight helper
> > + * @backlight: Backlight device
> > + *
> > + * Returns:
> > + * Zero on success, negative error code on failure.
> > + */
> > +int tinydrm_enable_backlight(struct backlight_device *backlight)
> > +{
> > + unsigned int old_state;
> > + int ret;
> > +
> > + if (!backlight)
> > + return 0;
> > +
> > + old_state = backlight->props.state;
> > + backlight->props.state &= ~BL_CORE_FBBLANK;
> > + DRM_DEBUG_KMS("Backlight state: 0x%x -> 0x%x\n", old_state,
> > + backlight->props.state);
> > +
> > + ret = backlight_update_status(backlight);
> > + if (ret)
> > + DRM_ERROR("Failed to enable backlight %d\n", ret);
> > +
> > + return ret;
> > +}
> > +EXPORT_SYMBOL(tinydrm_enable_backlight);
> > +
> > +/**
> > + * tinydrm_disable_backlight - Disable backlight helper
> > + * @backlight: Backlight device
> > + *
> > + * Returns:
> > + * Zero on success, negative error code on failure.
> > + */
> > +int tinydrm_disable_backlight(struct backlight_device *backlight)
> > +{
> > + unsigned int old_state;
> > + int ret;
> > +
> > + if (!backlight)
> > + return 0;
> > +
> > + old_state = backlight->props.state;
> > + backlight->props.state |= BL_CORE_FBBLANK;
> > + DRM_DEBUG_KMS("Backlight state: 0x%x -> 0x%x\n", old_state,
> > + backlight->props.state);
> > + ret = backlight_update_status(backlight);
> > + if (ret)
> > + DRM_ERROR("Failed to disable backlight %d\n", ret);
> > +
> > + return ret;
> > +}
> > +EXPORT_SYMBOL(tinydrm_disable_backlight);
> > +#endif
>
> These look like they really should be part of the backlight subsystem. I
> don't see anything DRM specific about them. Well, except for the error
> messages.
So this is a bit an unpopular opinion with some folks, but I don't require
anyone to submit new code to subsystems outside of drm for new drivers.
Simply because it takes months to get stuff landed, and in general it's
not worth the trouble.
We have piles of stuff in drm and drm drivers that should be in core but
isn't.
Imo the only reasonable way is to merge as-is, then follow-up with a patch
series to move the helper into the right subsystem. Most often
unfortunately that follow-up patch series will just die.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 45+ messages in thread
* Re: [PATCH v3 2/7] drm/tinydrm: Add helper functions
2017-01-31 16:03 ` [PATCH v3 2/7] drm/tinydrm: Add helper functions Noralf Trønnes
2017-02-06 8:56 ` Thierry Reding
@ 2017-02-06 10:10 ` Jani Nikula
1 sibling, 0 replies; 45+ messages in thread
From: Jani Nikula @ 2017-02-06 10:10 UTC (permalink / raw)
To: Noralf Trønnes, dri-devel, devicetree; +Cc: thomas.petazzoni, linux-kernel
On Tue, 31 Jan 2017, Noralf Trønnes <noralf@tronnes.org> wrote:
> +#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
BACKLIGHT_CLASS_DEVICE is a tristate, you'll want
#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
and probably either
depends on BACKLIGHT_CLASS_DEVICE
or
depends on BACKLIGHT_CLASS_DEVICE || BACKLIGHT_CLASS_DEVICE=n
in your Kconfig.
BR,
Jani.
--
Jani Nikula, Intel Open Source Technology Center
^ permalink raw reply [flat|nested] 45+ messages in thread
* [PATCH v3 3/7] drm/tinydrm: Add MIPI DBI support
2017-01-31 16:03 [PATCH v3 0/7] drm: Add support for tiny LCD displays Noralf Trønnes
2017-01-31 16:03 ` [PATCH v3 1/7] drm: Add DRM " Noralf Trønnes
2017-01-31 16:03 ` [PATCH v3 2/7] drm/tinydrm: Add helper functions Noralf Trønnes
@ 2017-01-31 16:03 ` Noralf Trønnes
2017-02-06 8:48 ` Thierry Reding
[not found] ` <20170131160319.9695-4-noralf-L59+Z2yzLopAfugRpC6u6w@public.gmane.org>
[not found] ` <20170131160319.9695-1-noralf-L59+Z2yzLopAfugRpC6u6w@public.gmane.org>
` (4 subsequent siblings)
7 siblings, 2 replies; 45+ messages in thread
From: Noralf Trønnes @ 2017-01-31 16:03 UTC (permalink / raw)
To: dri-devel, devicetree; +Cc: thomas.petazzoni, linux-kernel
Add support for MIPI DBI compatible controllers.
Interface type C option 1 and 3 are supported (SPI).
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
Documentation/gpu/tinydrm.rst | 12 +
drivers/gpu/drm/tinydrm/Kconfig | 3 +
drivers/gpu/drm/tinydrm/Makefile | 3 +
drivers/gpu/drm/tinydrm/mipi-dbi.c | 1005 ++++++++++++++++++++++++++++++++++++
include/drm/tinydrm/mipi-dbi.h | 107 ++++
5 files changed, 1130 insertions(+)
create mode 100644 drivers/gpu/drm/tinydrm/mipi-dbi.c
create mode 100644 include/drm/tinydrm/mipi-dbi.h
diff --git a/Documentation/gpu/tinydrm.rst b/Documentation/gpu/tinydrm.rst
index fb256d2..a913644 100644
--- a/Documentation/gpu/tinydrm.rst
+++ b/Documentation/gpu/tinydrm.rst
@@ -28,3 +28,15 @@ Additional helpers
.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
:export:
+
+MIPI DBI Compatible Controllers
+===============================
+
+.. kernel-doc:: drivers/gpu/drm/tinydrm/mipi-dbi.c
+ :doc: overview
+
+.. kernel-doc:: include/drm/tinydrm/mipi-dbi.h
+ :internal:
+
+.. kernel-doc:: drivers/gpu/drm/tinydrm/mipi-dbi.c
+ :export:
diff --git a/drivers/gpu/drm/tinydrm/Kconfig b/drivers/gpu/drm/tinydrm/Kconfig
index ffb873f..128d2f3 100644
--- a/drivers/gpu/drm/tinydrm/Kconfig
+++ b/drivers/gpu/drm/tinydrm/Kconfig
@@ -6,3 +6,6 @@ menuconfig DRM_TINYDRM
help
Choose this option if you have a tinydrm supported display.
If M is selected the module will be called tinydrm.
+
+config TINYDRM_MIPI_DBI
+ tristate
diff --git a/drivers/gpu/drm/tinydrm/Makefile b/drivers/gpu/drm/tinydrm/Makefile
index 7476ed1..fe5d4c6 100644
--- a/drivers/gpu/drm/tinydrm/Makefile
+++ b/drivers/gpu/drm/tinydrm/Makefile
@@ -1 +1,4 @@
obj-$(CONFIG_DRM_TINYDRM) += core/
+
+# Controllers
+obj-$(CONFIG_TINYDRM_MIPI_DBI) += mipi-dbi.o
diff --git a/drivers/gpu/drm/tinydrm/mipi-dbi.c b/drivers/gpu/drm/tinydrm/mipi-dbi.c
new file mode 100644
index 0000000..5ded299
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/mipi-dbi.c
@@ -0,0 +1,1005 @@
+/*
+ * MIPI Display Bus Interface (DBI) LCD controller support
+ *
+ * Copyright 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/tinydrm/mipi-dbi.h>
+#include <drm/tinydrm/tinydrm-helpers.h>
+#include <linux/debugfs.h>
+#include <linux/dma-buf.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+#include <video/mipi_display.h>
+
+#define MIPI_DBI_MAX_SPI_READ_SPEED 2000000 /* 2MHz */
+
+#define DCS_POWER_MODE_DISPLAY BIT(2)
+#define DCS_POWER_MODE_DISPLAY_NORMAL_MODE BIT(3)
+#define DCS_POWER_MODE_SLEEP_MODE BIT(4)
+#define DCS_POWER_MODE_PARTIAL_MODE BIT(5)
+#define DCS_POWER_MODE_IDLE_MODE BIT(6)
+#define DCS_POWER_MODE_RESERVED_MASK (BIT(0) | BIT(1) | BIT(7))
+
+/**
+ * DOC: overview
+ *
+ * This library provides helpers for MIPI Display Bus Interface (DBI)
+ * compatible display controllers.
+ *
+ * Many controllers for tiny lcd displays are MIPI compliant and can use this
+ * library. If a controller uses registers 0x2A and 0x2B to set the area to
+ * update and uses register 0x2C to write to frame memory, it is most likely
+ * MIPI compliant.
+ *
+ * Only MIPI Type 1 displays are supported since a full frame memory is needed.
+ *
+ * There are 3 MIPI DBI implementation types:
+ *
+ * A. Motorola 6800 type parallel bus
+ *
+ * B. Intel 8080 type parallel bus
+ *
+ * C. SPI type with 3 options:
+ *
+ * 1. 9-bit with the Data/Command signal as the ninth bit
+ * 2. Same as above except it's sent as 16 bits
+ * 3. 8-bit with the Data/Command signal as a separate D/CX pin
+ *
+ * Currently mipi_dbi only supports Type C options 1 and 3 with
+ * mipi_dbi_spi_init().
+ */
+
+#define MIPI_DBI_DEBUG_COMMAND(cmd, data, len) \
+({ \
+ if (!len) \
+ DRM_DEBUG_DRIVER("cmd=%02x\n", cmd); \
+ else if (len <= 32) \
+ DRM_DEBUG_DRIVER("cmd=%02x, par=%*ph\n", cmd, len, data); \
+ else \
+ DRM_DEBUG_DRIVER("cmd=%02x, len=%zu\n", cmd, len); \
+})
+
+static const u8 mipi_dbi_dcs_read_commands[] = {
+ MIPI_DCS_GET_DISPLAY_ID,
+ MIPI_DCS_GET_RED_CHANNEL,
+ MIPI_DCS_GET_GREEN_CHANNEL,
+ MIPI_DCS_GET_BLUE_CHANNEL,
+ MIPI_DCS_GET_DISPLAY_STATUS,
+ MIPI_DCS_GET_POWER_MODE,
+ MIPI_DCS_GET_ADDRESS_MODE,
+ MIPI_DCS_GET_PIXEL_FORMAT,
+ MIPI_DCS_GET_DISPLAY_MODE,
+ MIPI_DCS_GET_SIGNAL_MODE,
+ MIPI_DCS_GET_DIAGNOSTIC_RESULT,
+ MIPI_DCS_READ_MEMORY_START,
+ MIPI_DCS_READ_MEMORY_CONTINUE,
+ MIPI_DCS_GET_SCANLINE,
+ MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
+ MIPI_DCS_GET_CONTROL_DISPLAY,
+ MIPI_DCS_GET_POWER_SAVE,
+ MIPI_DCS_GET_CABC_MIN_BRIGHTNESS,
+ MIPI_DCS_READ_DDB_START,
+ MIPI_DCS_READ_DDB_CONTINUE,
+ 0, /* sentinel */
+};
+
+static bool mipi_dbi_command_is_read(struct mipi_dbi *mipi, u8 cmd)
+{
+ unsigned int i;
+
+ if (!mipi->read_commands)
+ return false;
+
+ for (i = 0; i < 0xff; i++) {
+ if (!mipi->read_commands[i])
+ return false;
+ if (cmd == mipi->read_commands[i])
+ return true;
+ }
+
+ return false;
+}
+
+/**
+ * mipi_dbi_command_read - MIPI DCS read command
+ * @mipi: MIPI structure
+ * @cmd: Command
+ * @val: Value read
+ *
+ * Send MIPI DCS read command to the controller.
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int mipi_dbi_command_read(struct mipi_dbi *mipi, u8 cmd, u8 *val)
+{
+ if (!mipi->read_commands)
+ return -EACCES;
+
+ if (!mipi_dbi_command_is_read(mipi, cmd))
+ return -EINVAL;
+
+ return mipi_dbi_command_buf(mipi, cmd, val, 1);
+}
+EXPORT_SYMBOL(mipi_dbi_command_read);
+
+/**
+ * mipi_dbi_command_buf - MIPI DCS command with parameter(s) in an array
+ * @mipi: MIPI structure
+ * @cmd: Command
+ * @data: Parameter buffer
+ * @len: Buffer length
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int mipi_dbi_command_buf(struct mipi_dbi *mipi, u8 cmd, u8 *data, size_t len)
+{
+ int ret;
+
+ mutex_lock(&mipi->cmdlock);
+ ret = mipi->command(mipi, cmd, data, len);
+ mutex_unlock(&mipi->cmdlock);
+
+ return ret;
+}
+EXPORT_SYMBOL(mipi_dbi_command_buf);
+
+static int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
+ struct drm_clip_rect *clip, bool swap)
+{
+ struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
+ struct dma_buf_attachment *import_attach = cma_obj->base.import_attach;
+ struct drm_format_name_buf format_name;
+ void *src = cma_obj->vaddr;
+ int ret = 0;
+
+ if (import_attach) {
+ ret = dma_buf_begin_cpu_access(import_attach->dmabuf,
+ DMA_FROM_DEVICE);
+ if (ret)
+ return ret;
+ }
+
+ switch (fb->format->format) {
+ case DRM_FORMAT_RGB565:
+ if (swap)
+ tinydrm_swab16(dst, src, fb, clip);
+ else
+ tinydrm_memcpy(dst, src, fb, clip);
+ break;
+ case DRM_FORMAT_XRGB8888:
+ tinydrm_xrgb8888_to_rgb565(dst, src, fb, clip, swap);
+ break;
+ default:
+ dev_err_once(fb->dev->dev, "Format is not supported: %s\n",
+ drm_get_format_name(fb->format->format,
+ &format_name));
+ return -EINVAL;
+ }
+
+ if (import_attach)
+ ret = dma_buf_end_cpu_access(import_attach->dmabuf,
+ DMA_FROM_DEVICE);
+ return ret;
+}
+
+static int mipi_dbi_fb_dirty(struct drm_framebuffer *fb,
+ struct drm_file *file_priv,
+ unsigned int flags, unsigned int color,
+ struct drm_clip_rect *clips,
+ unsigned int num_clips)
+{
+ struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
+ struct tinydrm_device *tdev = fb->dev->dev_private;
+ struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
+ bool swap = mipi->swap_bytes;
+ struct drm_clip_rect clip;
+ int ret = 0;
+ bool full;
+ void *tr;
+
+ mutex_lock(&tdev->dirty_lock);
+
+ if (!mipi->enabled)
+ goto out_unlock;
+
+ /* fbdev can flush even when we're not interested */
+ if (tdev->pipe.plane.fb != fb)
+ goto out_unlock;
+
+ full = tinydrm_merge_clips(&clip, clips, num_clips, flags,
+ fb->width, fb->height);
+
+ DRM_DEBUG("Flushing [FB:%d] x1=%u, x2=%u, y1=%u, y2=%u\n", fb->base.id,
+ clip.x1, clip.x2, clip.y1, clip.y2);
+
+ if (!mipi->dc || !full || swap ||
+ fb->format->format == DRM_FORMAT_XRGB8888) {
+ tr = mipi->tx_buf;
+ ret = mipi_dbi_buf_copy(mipi->tx_buf, fb, &clip, swap);
+ if (ret)
+ goto out_unlock;
+ } else {
+ tr = cma_obj->vaddr;
+ }
+
+ mipi_dbi_command(mipi, MIPI_DCS_SET_COLUMN_ADDRESS,
+ (clip.x1 >> 8) & 0xFF, clip.x1 & 0xFF,
+ (clip.x2 >> 8) & 0xFF, (clip.x2 - 1) & 0xFF);
+ mipi_dbi_command(mipi, MIPI_DCS_SET_PAGE_ADDRESS,
+ (clip.y1 >> 8) & 0xFF, clip.y1 & 0xFF,
+ (clip.y2 >> 8) & 0xFF, (clip.y2 - 1) & 0xFF);
+
+ ret = mipi_dbi_command_buf(mipi, MIPI_DCS_WRITE_MEMORY_START, tr,
+ (clip.x2 - clip.x1) * (clip.y2 - clip.y1) * 2);
+
+out_unlock:
+ mutex_unlock(&tdev->dirty_lock);
+
+ if (ret)
+ dev_err_once(fb->dev->dev, "Failed to update display %d\n",
+ ret);
+
+ return ret;
+}
+
+static const struct drm_framebuffer_funcs mipi_dbi_fb_funcs = {
+ .destroy = drm_fb_cma_destroy,
+ .create_handle = drm_fb_cma_create_handle,
+ .dirty = mipi_dbi_fb_dirty,
+};
+
+/**
+ * mipi_dbi_pipe_enable - MIPI DBI pipe enable helper
+ * @pipe: Display pipe
+ * @crtc_state: CRTC state
+ *
+ * This function enables backlight. Drivers can use this as their
+ * &drm_simple_display_pipe_funcs->enable callback.
+ */
+void mipi_dbi_pipe_enable(struct drm_simple_display_pipe *pipe,
+ struct drm_crtc_state *crtc_state)
+{
+ struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
+ struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
+ struct drm_framebuffer *fb = pipe->plane.fb;
+
+ DRM_DEBUG_KMS("\n");
+
+ mipi->enabled = true;
+ if (fb)
+ fb->funcs->dirty(fb, NULL, 0, 0, NULL, 0);
+
+ tinydrm_enable_backlight(mipi->backlight);
+}
+EXPORT_SYMBOL(mipi_dbi_pipe_enable);
+
+static void mipi_dbi_blank(struct mipi_dbi *mipi)
+{
+ struct drm_device *drm = mipi->tinydrm.drm;
+ u16 height = drm->mode_config.min_height;
+ u16 width = drm->mode_config.min_width;
+ size_t len = width * height * 2;
+
+ memset(mipi->tx_buf, 0, len);
+
+ mipi_dbi_command(mipi, MIPI_DCS_SET_COLUMN_ADDRESS, 0, 0,
+ (width >> 8) & 0xFF, (width - 1) & 0xFF);
+ mipi_dbi_command(mipi, MIPI_DCS_SET_PAGE_ADDRESS, 0, 0,
+ (height >> 8) & 0xFF, (height - 1) & 0xFF);
+ mipi_dbi_command_buf(mipi, MIPI_DCS_WRITE_MEMORY_START,
+ (u8 *)mipi->tx_buf, len);
+}
+
+/**
+ * mipi_dbi_pipe_disable - MIPI DBI pipe disable helper
+ * @pipe: Display pipe
+ *
+ * This function disables backlight if present or if not the
+ * display memory is blanked. Drivers can use this as their
+ * &drm_simple_display_pipe_funcs->disable callback.
+ */
+void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe)
+{
+ struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
+ struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
+
+ DRM_DEBUG_KMS("\n");
+
+ mipi->enabled = false;
+
+ if (mipi->backlight)
+ tinydrm_disable_backlight(mipi->backlight);
+ else
+ mipi_dbi_blank(mipi);
+}
+EXPORT_SYMBOL(mipi_dbi_pipe_disable);
+
+static const uint32_t mipi_dbi_formats[] = {
+ DRM_FORMAT_RGB565,
+ DRM_FORMAT_XRGB8888,
+};
+
+/**
+ * mipi_dbi_init - MIPI DBI initialization
+ * @dev: Parent device
+ * @mipi: &mipi_dbi structure to initialize
+ * @pipe_funcs: Display pipe functions
+ * @driver: DRM driver
+ * @mode: Display mode
+ * @rotation: Initial rotation in degrees Counter Clock Wise
+ *
+ * This function initializes a &mipi_dbi structure and it's underlying
+ * @tinydrm_device. It also sets up the display pipeline.
+ *
+ * Supported formats: Native RGB565 and emulated XRGB8888.
+ *
+ * Objects created by this function will be automatically freed on driver
+ * detach (devres).
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int mipi_dbi_init(struct device *dev, struct mipi_dbi *mipi,
+ const struct drm_simple_display_pipe_funcs *pipe_funcs,
+ struct drm_driver *driver,
+ const struct drm_display_mode *mode, unsigned int rotation)
+{
+ size_t bufsize = mode->vdisplay * mode->hdisplay * sizeof(u16);
+ struct tinydrm_device *tdev = &mipi->tinydrm;
+ int ret;
+
+ if (!mipi->command)
+ return -EINVAL;
+
+ mutex_init(&mipi->cmdlock);
+
+ mipi->tx_buf = devm_kmalloc(dev, bufsize, GFP_KERNEL);
+ if (!mipi->tx_buf)
+ return -ENOMEM;
+
+ ret = devm_tinydrm_init(dev, tdev, &mipi_dbi_fb_funcs, driver);
+ if (ret)
+ return ret;
+
+ /* TODO: Maybe add DRM_MODE_CONNECTOR_SPI */
+ ret = tinydrm_display_pipe_init(tdev, pipe_funcs,
+ DRM_MODE_CONNECTOR_VIRTUAL,
+ mipi_dbi_formats,
+ ARRAY_SIZE(mipi_dbi_formats), mode,
+ rotation);
+ if (ret)
+ return ret;
+
+ tdev->drm->mode_config.preferred_depth = 16;
+ mipi->rotation = rotation;
+
+ drm_mode_config_reset(tdev->drm);
+
+ DRM_DEBUG_KMS("preferred_depth=%u, rotation = %u\n",
+ tdev->drm->mode_config.preferred_depth, rotation);
+
+ return 0;
+}
+EXPORT_SYMBOL(mipi_dbi_init);
+
+/**
+ * mipi_dbi_hw_reset - Hardware reset of controller
+ * @mipi: MIPI DBI structure
+ *
+ * Reset controller if the &mipi_dbi->reset gpio is set.
+ */
+void mipi_dbi_hw_reset(struct mipi_dbi *mipi)
+{
+ if (!mipi->reset)
+ return;
+
+ gpiod_set_value_cansleep(mipi->reset, 0);
+ msleep(20);
+ gpiod_set_value_cansleep(mipi->reset, 1);
+ msleep(120);
+}
+EXPORT_SYMBOL(mipi_dbi_hw_reset);
+
+/**
+ * mipi_dbi_display_is_on - Check if display is on
+ * @mipi: MIPI DBI structure
+ *
+ * This function checks the Power Mode register (if readable) to see if
+ * display output is turned on. This can be used to see if the bootloader
+ * has already turned on the display avoiding flicker when the pipeline is
+ * enabled.
+ *
+ * Returns:
+ * true if the display can be verified to be on, false otherwise.
+ */
+bool mipi_dbi_display_is_on(struct mipi_dbi *mipi)
+{
+ u8 val;
+
+ if (mipi_dbi_command_read(mipi, MIPI_DCS_GET_POWER_MODE, &val))
+ return false;
+
+ val &= ~DCS_POWER_MODE_RESERVED_MASK;
+
+ if (val != (DCS_POWER_MODE_DISPLAY |
+ DCS_POWER_MODE_DISPLAY_NORMAL_MODE | DCS_POWER_MODE_SLEEP_MODE))
+ return false;
+
+ DRM_DEBUG_DRIVER("Display is ON\n");
+
+ return true;
+}
+EXPORT_SYMBOL(mipi_dbi_display_is_on);
+
+#ifdef CONFIG_SPI
+
+/*
+ * Many controllers have a max speed of 10MHz, but can be pushed way beyond
+ * that. Increase reliability by running pixel data at max speed and the rest
+ * at 10MHz, preventing transfer glitches from messing up the init settings.
+ */
+static u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len)
+{
+ if (len > 64)
+ return 0; /* use default */
+
+ return min_t(u32, 10000000, spi->max_speed_hz);
+}
+
+/*
+ * MIPI DBI Type C Option 1
+ *
+ * If the SPI controller doesn't have 9 bits per word support,
+ * use blocks of 9 bytes to send 8x 9-bit words using a 8-bit SPI transfer.
+ * Pad partial blocks with MIPI_DCS_NOP (zero).
+ * This is how the D/C bit (x) is added:
+ * x7654321
+ * 0x765432
+ * 10x76543
+ * 210x7654
+ * 3210x765
+ * 43210x76
+ * 543210x7
+ * 6543210x
+ * 76543210
+ */
+
+static int mipi_dbi_spi1e_transfer(struct mipi_dbi *mipi, int dc,
+ const void *buf, size_t len,
+ unsigned int bpw)
+{
+ bool swap_bytes = (bpw == 16 && tinydrm_machine_little_endian());
+ size_t chunk, max_chunk = mipi->tx_buf9_len;
+ struct spi_device *spi = mipi->spi;
+ struct spi_transfer tr = {
+ .tx_buf = mipi->tx_buf9,
+ .bits_per_word = 8,
+ };
+ struct spi_message m;
+ const u8 *src = buf;
+ int i, ret;
+ u8 *dst;
+
+ if (drm_debug & DRM_UT_DRIVER)
+ pr_debug("[drm:%s] dc=%d, max_chunk=%zu, transfers:\n",
+ __func__, dc, max_chunk);
+
+ tr.speed_hz = mipi_dbi_spi_cmd_max_speed(spi, len);
+ spi_message_init_with_transfers(&m, &tr, 1);
+
+ if (!dc) {
+ if (WARN_ON_ONCE(len != 1))
+ return -EINVAL;
+
+ /* Command: pad no-op's (zeroes) at beginning of block */
+ dst = mipi->tx_buf9;
+ memset(dst, 0, 9);
+ dst[8] = *src;
+ tr.len = 9;
+
+ tinydrm_dbg_spi_message(spi, &m);
+
+ return spi_sync(spi, &m);
+ }
+
+ /* max with room for adding one bit per byte */
+ max_chunk = max_chunk / 9 * 8;
+ /* but no bigger than len */
+ max_chunk = min(max_chunk, len);
+ /* 8 byte blocks */
+ max_chunk = max_t(size_t, 8, max_chunk & ~0x7);
+
+ while (len) {
+ size_t added = 0;
+
+ chunk = min(len, max_chunk);
+ len -= chunk;
+ dst = mipi->tx_buf9;
+
+ if (chunk < 8) {
+ u8 val, carry = 0;
+
+ /* Data: pad no-op's (zeroes) at end of block */
+ memset(dst, 0, 9);
+
+ if (swap_bytes) {
+ for (i = 1; i < (chunk + 1); i++) {
+ val = src[1];
+ *dst++ = carry | BIT(8 - i) | (val >> i);
+ carry = val << (8 - i);
+ i++;
+ val = src[0];
+ *dst++ = carry | BIT(8 - i) | (val >> i);
+ carry = val << (8 - i);
+ src += 2;
+ }
+ *dst++ = carry;
+ } else {
+ for (i = 1; i < (chunk + 1); i++) {
+ val = *src++;
+ *dst++ = carry | BIT(8 - i) | (val >> i);
+ carry = val << (8 - i);
+ }
+ *dst++ = carry;
+ }
+
+ chunk = 8;
+ added = 1;
+ } else {
+ for (i = 0; i < chunk; i += 8) {
+ if (swap_bytes) {
+ *dst++ = BIT(7) | (src[1] >> 1);
+ *dst++ = (src[1] << 7) | BIT(6) | (src[0] >> 2);
+ *dst++ = (src[0] << 6) | BIT(5) | (src[3] >> 3);
+ *dst++ = (src[3] << 5) | BIT(4) | (src[2] >> 4);
+ *dst++ = (src[2] << 4) | BIT(3) | (src[5] >> 5);
+ *dst++ = (src[5] << 3) | BIT(2) | (src[4] >> 6);
+ *dst++ = (src[4] << 2) | BIT(1) | (src[7] >> 7);
+ *dst++ = (src[7] << 1) | BIT(0);
+ *dst++ = src[6];
+ } else {
+ *dst++ = BIT(7) | (src[0] >> 1);
+ *dst++ = (src[0] << 7) | BIT(6) | (src[1] >> 2);
+ *dst++ = (src[1] << 6) | BIT(5) | (src[2] >> 3);
+ *dst++ = (src[2] << 5) | BIT(4) | (src[3] >> 4);
+ *dst++ = (src[3] << 4) | BIT(3) | (src[4] >> 5);
+ *dst++ = (src[4] << 3) | BIT(2) | (src[5] >> 6);
+ *dst++ = (src[5] << 2) | BIT(1) | (src[6] >> 7);
+ *dst++ = (src[6] << 1) | BIT(0);
+ *dst++ = src[7];
+ }
+
+ src += 8;
+ added++;
+ }
+ }
+
+ tr.len = chunk + added;
+
+ tinydrm_dbg_spi_message(spi, &m);
+ ret = spi_sync(spi, &m);
+ if (ret)
+ return ret;
+ };
+
+ return 0;
+}
+
+static int mipi_dbi_spi1_transfer(struct mipi_dbi *mipi, int dc,
+ const void *buf, size_t len,
+ unsigned int bpw)
+{
+ struct spi_device *spi = mipi->spi;
+ struct spi_transfer tr = {
+ .bits_per_word = 9,
+ };
+ const u16 *src16 = buf;
+ const u8 *src8 = buf;
+ struct spi_message m;
+ size_t max_chunk;
+ u16 *dst16;
+ int ret;
+
+ if (!tinydrm_spi_bpw_supported(spi, 9))
+ return mipi_dbi_spi1e_transfer(mipi, dc, buf, len, bpw);
+
+ tr.speed_hz = mipi_dbi_spi_cmd_max_speed(spi, len);
+ max_chunk = mipi->tx_buf9_len;
+ dst16 = mipi->tx_buf9;
+
+ if (drm_debug & DRM_UT_DRIVER)
+ pr_debug("[drm:%s] dc=%d, max_chunk=%zu, transfers:\n",
+ __func__, dc, max_chunk);
+
+ max_chunk = min(max_chunk / 2, len);
+
+ spi_message_init_with_transfers(&m, &tr, 1);
+ tr.tx_buf = dst16;
+
+ while (len) {
+ size_t chunk = min(len, max_chunk);
+ unsigned int i;
+
+ if (bpw == 16 && tinydrm_machine_little_endian()) {
+ for (i = 0; i < (chunk * 2); i += 2) {
+ dst16[i] = *src16 >> 8;
+ dst16[i + 1] = *src16++ & 0xFF;
+ if (dc) {
+ dst16[i] |= 0x0100;
+ dst16[i + 1] |= 0x0100;
+ }
+ }
+ } else {
+ for (i = 0; i < chunk; i++) {
+ dst16[i] = *src8++;
+ if (dc)
+ dst16[i] |= 0x0100;
+ }
+ }
+
+ tr.len = chunk;
+ len -= chunk;
+
+ tinydrm_dbg_spi_message(spi, &m);
+ ret = spi_sync(spi, &m);
+ if (ret)
+ return ret;
+ };
+
+ return 0;
+}
+
+static int mipi_dbi_typec1_command(struct mipi_dbi *mipi, u8 cmd,
+ u8 *parameters, size_t num)
+{
+ unsigned int bpw = (cmd == MIPI_DCS_WRITE_MEMORY_START) ? 16 : 8;
+ int ret;
+
+ if (mipi_dbi_command_is_read(mipi, cmd))
+ return -ENOTSUPP;
+
+ MIPI_DBI_DEBUG_COMMAND(cmd, parameters, num);
+
+ ret = mipi_dbi_spi1_transfer(mipi, 0, &cmd, 1, 8);
+ if (ret || !num)
+ return ret;
+
+ return mipi_dbi_spi1_transfer(mipi, 1, parameters, num, bpw);
+}
+
+/* MIPI DBI Type C Option 3 */
+
+static int mipi_dbi_typec3_command_read(struct mipi_dbi *mipi, u8 cmd,
+ u8 *data, size_t len)
+{
+ struct spi_device *spi = mipi->spi;
+ u32 speed_hz = min_t(u32, MIPI_DBI_MAX_SPI_READ_SPEED,
+ spi->max_speed_hz / 2);
+ struct spi_transfer tr[2] = {
+ {
+ .speed_hz = speed_hz,
+ .tx_buf = &cmd,
+ .len = 1,
+ }, {
+ .speed_hz = speed_hz,
+ .len = len,
+ },
+ };
+ struct spi_message m;
+ u8 *buf;
+ int ret;
+
+ if (!len)
+ return -EINVAL;
+
+ /*
+ * Support non-standard 24-bit and 32-bit Nokia read commands which
+ * start with a dummy clock, so we need to read an extra byte.
+ */
+ if (cmd == MIPI_DCS_GET_DISPLAY_ID ||
+ cmd == MIPI_DCS_GET_DISPLAY_STATUS) {
+ if (!(len == 3 || len == 4))
+ return -EINVAL;
+
+ tr[1].len = len + 1;
+ }
+
+ buf = kmalloc(tr[1].len, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ tr[1].rx_buf = buf;
+ gpiod_set_value_cansleep(mipi->dc, 0);
+
+ spi_message_init_with_transfers(&m, tr, ARRAY_SIZE(tr));
+ ret = spi_sync(spi, &m);
+ if (ret)
+ goto err_free;
+
+ tinydrm_dbg_spi_message(spi, &m);
+
+ if (tr[1].len == len) {
+ memcpy(data, buf, len);
+ } else {
+ unsigned int i;
+
+ for (i = 0; i < len; i++)
+ data[i] = (buf[i] << 1) | !!(buf[i + 1] & BIT(7));
+ }
+
+ MIPI_DBI_DEBUG_COMMAND(cmd, data, len);
+
+err_free:
+ kfree(buf);
+
+ return ret;
+}
+
+static int mipi_dbi_typec3_command(struct mipi_dbi *mipi, u8 cmd,
+ u8 *par, size_t num)
+{
+ struct spi_device *spi = mipi->spi;
+ unsigned int bpw = 8;
+ u32 speed_hz;
+ int ret;
+
+ if (mipi_dbi_command_is_read(mipi, cmd))
+ return mipi_dbi_typec3_command_read(mipi, cmd, par, num);
+
+ MIPI_DBI_DEBUG_COMMAND(cmd, par, num);
+
+ gpiod_set_value_cansleep(mipi->dc, 0);
+ speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 1);
+ ret = tinydrm_spi_transfer(spi, speed_hz, NULL, 8, &cmd, 1);
+ if (ret || !num)
+ return ret;
+
+ if (cmd == MIPI_DCS_WRITE_MEMORY_START && !mipi->swap_bytes)
+ bpw = 16;
+
+ gpiod_set_value_cansleep(mipi->dc, 1);
+ speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num);
+
+ return tinydrm_spi_transfer(spi, speed_hz, NULL, bpw, par, num);
+}
+
+/**
+ * mipi_dbi_spi_init - Initialize MIPI DBI SPI interfaced controller
+ * @spi: SPI device
+ * @dc: D/C gpio (optional)
+ * @mipi: &mipi_dbi structure to initialize
+ * @pipe_funcs: Display pipe functions
+ * @driver: DRM driver
+ * @mode: Display mode
+ * @rotation: Initial rotation in degrees Counter Clock Wise
+ *
+ * This function sets &mipi_dbi->command, enables &mipi->read_commands for the
+ * usual read commands and initializes @mipi using mipi_dbi_init().
+ *
+ * If @dc is set, a Type C Option 3 interface is assumed, if not
+ * Type C Option 1.
+ *
+ * If the SPI master driver doesn't support the necessary bits per word,
+ * the following transformation is used:
+ *
+ * - 9-bit: reorder buffer as 9x 8-bit words, padded with no-op command.
+ * - 16-bit: if big endian send as 8-bit, if little endian swap bytes
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *mipi,
+ struct gpio_desc *dc,
+ const struct drm_simple_display_pipe_funcs *pipe_funcs,
+ struct drm_driver *driver,
+ const struct drm_display_mode *mode,
+ unsigned int rotation)
+{
+ size_t tx_size = tinydrm_spi_max_transfer_size(spi, 0);
+ struct device *dev = &spi->dev;
+ int ret;
+
+ if (tx_size < 16) {
+ DRM_ERROR("SPI transmit buffer too small: %zu\n", tx_size);
+ return -EINVAL;
+ }
+
+ /*
+ * Even though it's not the SPI device that does DMA (the master does),
+ * the dma mask is necessary for the dma_alloc_wc() in
+ * drm_gem_cma_create(). The dma_addr returned will be a physical
+ * adddress which might be different from the bus address, but this is
+ * not a problem since the address will not be used.
+ * The virtual address is used in the transfer and the SPI core
+ * re-maps it on the SPI master device using the DMA streaming API
+ * (spi_map_buf()).
+ */
+ if (!dev->coherent_dma_mask) {
+ ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
+ if (ret) {
+ dev_warn(dev, "Failed to set dma mask %d\n", ret);
+ return ret;
+ }
+ }
+
+ mipi->spi = spi;
+ mipi->read_commands = mipi_dbi_dcs_read_commands;
+
+ if (dc) {
+ mipi->command = mipi_dbi_typec3_command;
+ mipi->dc = dc;
+ if (tinydrm_machine_little_endian() &&
+ !tinydrm_spi_bpw_supported(spi, 16))
+ mipi->swap_bytes = true;
+ } else {
+ mipi->command = mipi_dbi_typec1_command;
+ mipi->tx_buf9_len = tx_size;
+ mipi->tx_buf9 = devm_kmalloc(dev, tx_size, GFP_KERNEL);
+ if (!mipi->tx_buf9)
+ return -ENOMEM;
+ }
+
+ return mipi_dbi_init(dev, mipi, pipe_funcs, driver, mode, rotation);
+}
+EXPORT_SYMBOL(mipi_dbi_spi_init);
+
+#endif /* CONFIG_SPI */
+
+#ifdef CONFIG_DEBUG_FS
+
+static ssize_t mipi_dbi_debugfs_command_write(struct file *file,
+ const char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *m = file->private_data;
+ struct mipi_dbi *mipi = m->private;
+ u8 val, cmd, parameters[64];
+ char *buf, *pos, *token;
+ unsigned int i;
+ int ret;
+
+ buf = memdup_user_nul(ubuf, count);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ /* strip trailing whitespace */
+ for (i = count - 1; i > 0; i--)
+ if (isspace(buf[i]))
+ buf[i] = '\0';
+ else
+ break;
+ i = 0;
+ pos = buf;
+ while (pos) {
+ token = strsep(&pos, " ");
+ if (!token) {
+ ret = -EINVAL;
+ goto err_free;
+ }
+
+ ret = kstrtou8(token, 16, &val);
+ if (ret < 0)
+ goto err_free;
+
+ if (token == buf)
+ cmd = val;
+ else
+ parameters[i++] = val;
+
+ if (i == 64) {
+ ret = -E2BIG;
+ goto err_free;
+ }
+ }
+
+ ret = mipi_dbi_command_buf(mipi, cmd, parameters, i);
+
+err_free:
+ kfree(buf);
+
+ return ret < 0 ? ret : count;
+}
+
+static int mipi_dbi_debugfs_command_show(struct seq_file *m, void *unused)
+{
+ struct mipi_dbi *mipi = m->private;
+ u8 cmd, val[4];
+ size_t len, i;
+ int ret;
+
+ for (cmd = 0; cmd < 255; cmd++) {
+ if (!mipi_dbi_command_is_read(mipi, cmd))
+ continue;
+
+ switch (cmd) {
+ case MIPI_DCS_READ_MEMORY_START:
+ case MIPI_DCS_READ_MEMORY_CONTINUE:
+ len = 2;
+ break;
+ case MIPI_DCS_GET_DISPLAY_ID:
+ len = 3;
+ break;
+ case MIPI_DCS_GET_DISPLAY_STATUS:
+ len = 4;
+ break;
+ default:
+ len = 1;
+ break;
+ }
+
+ seq_printf(m, "%02x: ", cmd);
+ ret = mipi_dbi_command_buf(mipi, cmd, val, len);
+ if (ret) {
+ seq_puts(m, "XX\n");
+ continue;
+ }
+
+ for (i = 0; i < len; i++)
+ seq_printf(m, "%02x", val[i]);
+ seq_puts(m, "\n");
+ }
+
+ return 0;
+}
+
+static int mipi_dbi_debugfs_command_open(struct inode *inode,
+ struct file *file)
+{
+ return single_open(file, mipi_dbi_debugfs_command_show,
+ inode->i_private);
+}
+
+static const struct file_operations mipi_dbi_debugfs_command_fops = {
+ .owner = THIS_MODULE,
+ .open = mipi_dbi_debugfs_command_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = mipi_dbi_debugfs_command_write,
+};
+
+static const struct drm_info_list mipi_dbi_debugfs_list[] = {
+ { "fb", drm_fb_cma_debugfs_show, 0 },
+};
+
+/**
+ * mipi_dbi_debugfs_init - Create debugfs entries
+ * @minor: DRM minor
+ *
+ * This function creates a 'command' debugfs file for sending commands to the
+ * controller or getting the read command values.
+ * Drivers can use this as their &drm_driver->debugfs_init callback.
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int mipi_dbi_debugfs_init(struct drm_minor *minor)
+{
+ struct tinydrm_device *tdev = minor->dev->dev_private;
+ struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
+ umode_t mode = S_IFREG | S_IWUSR;
+
+ if (mipi->read_commands)
+ mode |= S_IRUGO;
+ debugfs_create_file("command", mode, minor->debugfs_root, mipi,
+ &mipi_dbi_debugfs_command_fops);
+
+ return drm_debugfs_create_files(mipi_dbi_debugfs_list,
+ ARRAY_SIZE(mipi_dbi_debugfs_list),
+ minor->debugfs_root, minor);
+}
+EXPORT_SYMBOL(mipi_dbi_debugfs_init);
+
+#endif
+
+MODULE_LICENSE("GPL");
diff --git a/include/drm/tinydrm/mipi-dbi.h b/include/drm/tinydrm/mipi-dbi.h
new file mode 100644
index 0000000..d137b16
--- /dev/null
+++ b/include/drm/tinydrm/mipi-dbi.h
@@ -0,0 +1,107 @@
+/*
+ * MIPI Display Bus Interface (DBI) LCD controller support
+ *
+ * Copyright 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_MIPI_DBI_H
+#define __LINUX_MIPI_DBI_H
+
+#include <drm/tinydrm/tinydrm.h>
+
+struct spi_device;
+struct gpio_desc;
+struct regulator;
+
+/**
+ * struct mipi_dbi - MIPI DBI controller
+ * @tinydrm: tinydrm base
+ * @spi: SPI device
+ * @enabled: Pipeline is enabled
+ * @cmdlock: Command lock
+ * @command: Bus specific callback executing commands.
+ * @read_commands: Array of read commands terminated by a zero entry.
+ * Reading is disabled if this is NULL.
+ * @dc: Optional D/C gpio.
+ * @tx_buf: Buffer used for transfer (copy clip rect area)
+ * @tx_buf9: Buffer used for Option 1 9-bit conversion
+ * @tx_buf9_len: Size of tx_buf9.
+ * @swap_bytes: Swap bytes in buffer before transfer
+ * @reset: Optional reset gpio
+ * @rotation: initial rotation in degrees Counter Clock Wise
+ * @backlight: backlight device (optional)
+ * @regulator: power regulator (optional)
+ */
+struct mipi_dbi {
+ struct tinydrm_device tinydrm;
+ struct spi_device *spi;
+ bool enabled;
+ struct mutex cmdlock;
+ int (*command)(struct mipi_dbi *mipi, u8 cmd, u8 *param, size_t num);
+ const u8 *read_commands;
+ struct gpio_desc *dc;
+ u16 *tx_buf;
+ void *tx_buf9;
+ size_t tx_buf9_len;
+ bool swap_bytes;
+ struct gpio_desc *reset;
+ unsigned int rotation;
+ struct backlight_device *backlight;
+ struct regulator *regulator;
+};
+
+static inline struct mipi_dbi *
+mipi_dbi_from_tinydrm(struct tinydrm_device *tdev)
+{
+ return container_of(tdev, struct mipi_dbi, tinydrm);
+}
+
+int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *mipi,
+ struct gpio_desc *dc,
+ const struct drm_simple_display_pipe_funcs *pipe_funcs,
+ struct drm_driver *driver,
+ const struct drm_display_mode *mode,
+ unsigned int rotation);
+int mipi_dbi_init(struct device *dev, struct mipi_dbi *mipi,
+ const struct drm_simple_display_pipe_funcs *pipe_funcs,
+ struct drm_driver *driver,
+ const struct drm_display_mode *mode, unsigned int rotation);
+void mipi_dbi_pipe_enable(struct drm_simple_display_pipe *pipe,
+ struct drm_crtc_state *crtc_state);
+void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe);
+void mipi_dbi_hw_reset(struct mipi_dbi *mipi);
+bool mipi_dbi_display_is_on(struct mipi_dbi *mipi);
+
+int mipi_dbi_command_read(struct mipi_dbi *mipi, u8 cmd, u8 *val);
+int mipi_dbi_command_buf(struct mipi_dbi *mipi, u8 cmd, u8 *data, size_t len);
+
+/**
+ * mipi_dbi_command - MIPI DCS command with optional parameter(s)
+ * @mipi: MIPI structure
+ * @cmd: Command
+ * @seq...: Optional parameter(s)
+ *
+ * Send MIPI DCS command to the controller. Use mipi_dbi_command_read() for
+ * get/read.
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+#define mipi_dbi_command(mipi, cmd, seq...) \
+({ \
+ u8 d[] = { seq }; \
+ mipi_dbi_command_buf(mipi, cmd, d, ARRAY_SIZE(d)); \
+})
+
+#ifdef CONFIG_DEBUG_FS
+int mipi_dbi_debugfs_init(struct drm_minor *minor);
+#else
+#define mipi_dbi_debugfs_init NULL
+#endif
+
+#endif /* __LINUX_MIPI_DBI_H */
--
2.10.2
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^ permalink raw reply related [flat|nested] 45+ messages in thread* Re: [PATCH v3 3/7] drm/tinydrm: Add MIPI DBI support
2017-01-31 16:03 ` [PATCH v3 3/7] drm/tinydrm: Add MIPI DBI support Noralf Trønnes
@ 2017-02-06 8:48 ` Thierry Reding
[not found] ` <20170206084848.GC27607-EkSeR96xj6Pcmrwk2tT4+A@public.gmane.org>
[not found] ` <20170131160319.9695-4-noralf-L59+Z2yzLopAfugRpC6u6w@public.gmane.org>
1 sibling, 1 reply; 45+ messages in thread
From: Thierry Reding @ 2017-02-06 8:48 UTC (permalink / raw)
To: Noralf Trønnes; +Cc: thomas.petazzoni, devicetree, linux-kernel, dri-devel
[-- Attachment #1.1: Type: text/plain, Size: 3008 bytes --]
On Tue, Jan 31, 2017 at 05:03:15PM +0100, Noralf Trønnes wrote:
> Add support for MIPI DBI compatible controllers.
> Interface type C option 1 and 3 are supported (SPI).
>
> Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
> ---
> Documentation/gpu/tinydrm.rst | 12 +
> drivers/gpu/drm/tinydrm/Kconfig | 3 +
> drivers/gpu/drm/tinydrm/Makefile | 3 +
> drivers/gpu/drm/tinydrm/mipi-dbi.c | 1005 ++++++++++++++++++++++++++++++++++++
> include/drm/tinydrm/mipi-dbi.h | 107 ++++
> 5 files changed, 1130 insertions(+)
> create mode 100644 drivers/gpu/drm/tinydrm/mipi-dbi.c
> create mode 100644 include/drm/tinydrm/mipi-dbi.h
Any reason why this is in the tinydrm subdirectory? Looks like this
could be useful to drivers outside of it.
> diff --git a/drivers/gpu/drm/tinydrm/mipi-dbi.c b/drivers/gpu/drm/tinydrm/mipi-dbi.c
> new file mode 100644
> index 0000000..5ded299
> --- /dev/null
> +++ b/drivers/gpu/drm/tinydrm/mipi-dbi.c
> @@ -0,0 +1,1005 @@
> +/*
> + * MIPI Display Bus Interface (DBI) LCD controller support
> + *
> + * Copyright 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/tinydrm/mipi-dbi.h>
> +#include <drm/tinydrm/tinydrm-helpers.h>
> +#include <linux/debugfs.h>
> +#include <linux/dma-buf.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/spi/spi.h>
> +#include <video/mipi_display.h>
> +
> +#define MIPI_DBI_MAX_SPI_READ_SPEED 2000000 /* 2MHz */
> +
> +#define DCS_POWER_MODE_DISPLAY BIT(2)
> +#define DCS_POWER_MODE_DISPLAY_NORMAL_MODE BIT(3)
> +#define DCS_POWER_MODE_SLEEP_MODE BIT(4)
> +#define DCS_POWER_MODE_PARTIAL_MODE BIT(5)
> +#define DCS_POWER_MODE_IDLE_MODE BIT(6)
> +#define DCS_POWER_MODE_RESERVED_MASK (BIT(0) | BIT(1) | BIT(7))
Should these perhaps be defined in include/video/mipi_display.h since
that already defines the MIPI_DCS_GET_POWER_MODE that this is used with?
> +/**
> + * mipi_dbi_command - MIPI DCS command with optional parameter(s)
> + * @mipi: MIPI structure
> + * @cmd: Command
> + * @seq...: Optional parameter(s)
> + *
> + * Send MIPI DCS command to the controller. Use mipi_dbi_command_read() for
> + * get/read.
> + *
> + * Returns:
> + * Zero on success, negative error code on failure.
> + */
> +#define mipi_dbi_command(mipi, cmd, seq...) \
> +({ \
> + u8 d[] = { seq }; \
> + mipi_dbi_command_buf(mipi, cmd, d, ARRAY_SIZE(d)); \
> +})
I feel obligated to object to this because I objected to the same macro
when Andrzej wanted to add the same macro for MIPI DSI. But since I'm
apparently the only one that doesn't like this, maybe it's time for me
to embrace this.
Thierry
[-- Attachment #1.2: signature.asc --]
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^ permalink raw reply [flat|nested] 45+ messages in thread[parent not found: <20170131160319.9695-4-noralf-L59+Z2yzLopAfugRpC6u6w@public.gmane.org>]
* Re: [PATCH v3 3/7] drm/tinydrm: Add MIPI DBI support
[not found] ` <20170131160319.9695-4-noralf-L59+Z2yzLopAfugRpC6u6w@public.gmane.org>
@ 2017-02-06 11:25 ` Jani Nikula
0 siblings, 0 replies; 45+ messages in thread
From: Jani Nikula @ 2017-02-06 11:25 UTC (permalink / raw)
To: Noralf Trønnes, dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW,
devicetree-u79uwXL29TY76Z2rM5mHXA
Cc: thomas.petazzoni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8,
linux-kernel-u79uwXL29TY76Z2rM5mHXA
On Tue, 31 Jan 2017, Noralf Trønnes <noralf-L59+Z2yzLopAfugRpC6u6w@public.gmane.org> wrote:
> +static bool mipi_dbi_command_is_read(struct mipi_dbi *mipi, u8 cmd)
Okay this is one giant bikeshedding nitpick, but here goes anyway. Why
do you call MIPI DBI just "mipi", here and all around? Why not
"mipi_dbi" or "dbi"? We never talk about "vesa" displays or use that as
a shorthand when we refer to Display Port either.
BR,
Jani.
--
Jani Nikula, Intel Open Source Technology Center
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^ permalink raw reply [flat|nested] 45+ messages in thread
[parent not found: <20170131160319.9695-1-noralf-L59+Z2yzLopAfugRpC6u6w@public.gmane.org>]
* [PATCH v3 4/7] of: Add vendor prefix for Multi-Inno
[not found] ` <20170131160319.9695-1-noralf-L59+Z2yzLopAfugRpC6u6w@public.gmane.org>
@ 2017-01-31 16:03 ` Noralf Trønnes
0 siblings, 0 replies; 45+ messages in thread
From: Noralf Trønnes @ 2017-01-31 16:03 UTC (permalink / raw)
To: dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW,
devicetree-u79uwXL29TY76Z2rM5mHXA
Cc: robh-DgEjT+Ai2ygdnm+yROfE0A,
thomas.petazzoni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8,
linux-kernel-u79uwXL29TY76Z2rM5mHXA, Noralf Trønnes
Multi-Inno Technology Co.,Ltd is a Hong Kong based company offering
LCD, LCD module products and complete panel solutions.
Signed-off-by: Noralf Trønnes <noralf-L59+Z2yzLopAfugRpC6u6w@public.gmane.org>
Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
Documentation/devicetree/bindings/vendor-prefixes.txt | 1 +
1 file changed, 1 insertion(+)
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 11c7e5c..6879193 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -193,6 +193,7 @@ mpl MPL AG
mqmaker mqmaker Inc.
msi Micro-Star International Co. Ltd.
mti Imagination Technologies Ltd. (formerly MIPS Technologies Inc.)
+multi-inno Multi-Inno Technology Co.,Ltd
mundoreader Mundo Reader S.L.
murata Murata Manufacturing Co., Ltd.
mxicy Macronix International Co., Ltd.
--
2.10.2
--
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^ permalink raw reply related [flat|nested] 45+ messages in thread
* [PATCH v3 5/7] dt-bindings: display: Add common rotation property
2017-01-31 16:03 [PATCH v3 0/7] drm: Add support for tiny LCD displays Noralf Trønnes
` (3 preceding siblings ...)
[not found] ` <20170131160319.9695-1-noralf-L59+Z2yzLopAfugRpC6u6w@public.gmane.org>
@ 2017-01-31 16:03 ` Noralf Trønnes
2017-02-01 17:41 ` Rob Herring
2017-01-31 16:03 ` [PATCH v3 6/7] dt-bindings: Add Multi-Inno MI0283QT binding Noralf Trønnes
` (2 subsequent siblings)
7 siblings, 1 reply; 45+ messages in thread
From: Noralf Trønnes @ 2017-01-31 16:03 UTC (permalink / raw)
To: dri-devel, devicetree; +Cc: thomas.petazzoni, linux-kernel
Display panels can be oriented many ways, especially in the embedded
world. The rotation property is a way to describe this orientation.
The counter clockwise direction is chosen because that's what fbdev
and drm use.
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
Documentation/devicetree/bindings/display/display.txt | 4 ++++
1 file changed, 4 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/display.txt
diff --git a/Documentation/devicetree/bindings/display/display.txt b/Documentation/devicetree/bindings/display/display.txt
new file mode 100644
index 0000000..e2e6867
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/display.txt
@@ -0,0 +1,4 @@
+Common display properties
+-------------------------
+
+- rotation: Display rotation in degrees counter clockwise (0,90,180,270)
--
2.10.2
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^ permalink raw reply related [flat|nested] 45+ messages in thread* Re: [PATCH v3 5/7] dt-bindings: display: Add common rotation property
2017-01-31 16:03 ` [PATCH v3 5/7] dt-bindings: display: Add common rotation property Noralf Trønnes
@ 2017-02-01 17:41 ` Rob Herring
2017-02-03 12:16 ` Noralf Trønnes
0 siblings, 1 reply; 45+ messages in thread
From: Rob Herring @ 2017-02-01 17:41 UTC (permalink / raw)
To: Noralf Trønnes; +Cc: thomas.petazzoni, devicetree, linux-kernel, dri-devel
On Tue, Jan 31, 2017 at 05:03:17PM +0100, Noralf Trønnes wrote:
> Display panels can be oriented many ways, especially in the embedded
> world. The rotation property is a way to describe this orientation.
> The counter clockwise direction is chosen because that's what fbdev
> and drm use.
The h/w mounting is rotated counter clockwise, so the framebuffers'
contents are rotated clockwise, right?
>
> Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
> ---
> Documentation/devicetree/bindings/display/display.txt | 4 ++++
This is panel property, so bindings/display/panel/panel.txt.
> 1 file changed, 4 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/display/display.txt
>
> diff --git a/Documentation/devicetree/bindings/display/display.txt b/Documentation/devicetree/bindings/display/display.txt
> new file mode 100644
> index 0000000..e2e6867
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/display.txt
> @@ -0,0 +1,4 @@
> +Common display properties
> +-------------------------
> +
> +- rotation: Display rotation in degrees counter clockwise (0,90,180,270)
> --
> 2.10.2
>
> --
> To unsubscribe from this list: send the line "unsubscribe devicetree" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
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^ permalink raw reply [flat|nested] 45+ messages in thread
* Re: [PATCH v3 5/7] dt-bindings: display: Add common rotation property
2017-02-01 17:41 ` Rob Herring
@ 2017-02-03 12:16 ` Noralf Trønnes
[not found] ` <30cce12b-b6c6-c651-409e-5574b5f7576e-L59+Z2yzLopAfugRpC6u6w@public.gmane.org>
0 siblings, 1 reply; 45+ messages in thread
From: Noralf Trønnes @ 2017-02-03 12:16 UTC (permalink / raw)
To: Rob Herring, Thierry Reding
Cc: thomas.petazzoni, devicetree, linux-kernel, dri-devel
Thierry, please have a look at this.
In which direction should we rotate to match how drm rotation works?
Den 01.02.2017 18.41, skrev Rob Herring:
> On Tue, Jan 31, 2017 at 05:03:17PM +0100, Noralf Trønnes wrote:
>> Display panels can be oriented many ways, especially in the embedded
>> world. The rotation property is a way to describe this orientation.
>> The counter clockwise direction is chosen because that's what fbdev
>> and drm use.
> The h/w mounting is rotated counter clockwise, so the framebuffers'
> contents are rotated clockwise, right?
>
>> Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
>> ---
>> Documentation/devicetree/bindings/display/display.txt | 4 ++++
> This is panel property, so bindings/display/panel/panel.txt.
>
>> 1 file changed, 4 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/display/display.txt
>>
>> diff --git a/Documentation/devicetree/bindings/display/display.txt b/Documentation/devicetree/bindings/display/display.txt
>> new file mode 100644
>> index 0000000..e2e6867
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/display.txt
>> @@ -0,0 +1,4 @@
>> +Common display properties
>> +-------------------------
>> +
>> +- rotation: Display rotation in degrees counter clockwise (0,90,180,270)
>> --
>> 2.10.2
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe devicetree" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
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^ permalink raw reply [flat|nested] 45+ messages in thread
* [PATCH v3 6/7] dt-bindings: Add Multi-Inno MI0283QT binding
2017-01-31 16:03 [PATCH v3 0/7] drm: Add support for tiny LCD displays Noralf Trønnes
` (4 preceding siblings ...)
2017-01-31 16:03 ` [PATCH v3 5/7] dt-bindings: display: Add common rotation property Noralf Trønnes
@ 2017-01-31 16:03 ` Noralf Trønnes
2017-02-01 17:42 ` Rob Herring
2017-01-31 16:03 ` [PATCH v3 7/7] drm/tinydrm: Add support for Multi-Inno MI0283QT display Noralf Trønnes
2017-02-07 12:00 ` [PATCH v3 0/7] drm: Add support for tiny LCD displays Thierry Reding
7 siblings, 1 reply; 45+ messages in thread
From: Noralf Trønnes @ 2017-01-31 16:03 UTC (permalink / raw)
To: dri-devel, devicetree; +Cc: thomas.petazzoni, linux-kernel
Add device-tree binding documentation for the MI0283QT display panel.
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
Datasheet: https://cdn-shop.adafruit.com/datasheets/MI0283QT-11+V1.1.PDF
.../bindings/display/multi-inno,mi0283qt.txt | 27 ++++++++++++++++++++++
1 file changed, 27 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/multi-inno,mi0283qt.txt
diff --git a/Documentation/devicetree/bindings/display/multi-inno,mi0283qt.txt b/Documentation/devicetree/bindings/display/multi-inno,mi0283qt.txt
new file mode 100644
index 0000000..eed48c3
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/multi-inno,mi0283qt.txt
@@ -0,0 +1,27 @@
+Multi-Inno MI0283QT display panel
+
+Required properties:
+- compatible: "multi-inno,mi0283qt".
+
+The node for this driver must be a child node of a SPI controller, hence
+all mandatory properties described in ../spi/spi-bus.txt must be specified.
+
+Optional properties:
+- dc-gpios: D/C pin. The presence/absence of this GPIO determines
+ the panel interface mode (IM[3:0] pins):
+ - present: IM=x110 4-wire 8-bit data serial interface
+ - absent: IM=x101 3-wire 9-bit data serial interface
+- reset-gpios: Reset pin
+- power-supply: A regulator node for the supply voltage.
+- backlight: phandle of the backlight device attached to the panel
+- rotation: panel rotation in degrees counter clockwise (0,90,180,270)
+
+Example:
+ mi0283qt@0{
+ compatible = "multi-inno,mi0283qt";
+ reg = <0>;
+ spi-max-frequency = <32000000>;
+ rotation = <90>;
+ dc-gpios = <&gpio 25 0>;
+ backlight = <&backlight>;
+ };
--
2.10.2
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^ permalink raw reply related [flat|nested] 45+ messages in thread* Re: [PATCH v3 6/7] dt-bindings: Add Multi-Inno MI0283QT binding
2017-01-31 16:03 ` [PATCH v3 6/7] dt-bindings: Add Multi-Inno MI0283QT binding Noralf Trønnes
@ 2017-02-01 17:42 ` Rob Herring
0 siblings, 0 replies; 45+ messages in thread
From: Rob Herring @ 2017-02-01 17:42 UTC (permalink / raw)
To: Noralf Trønnes; +Cc: thomas.petazzoni, devicetree, linux-kernel, dri-devel
On Tue, Jan 31, 2017 at 05:03:18PM +0100, Noralf Trønnes wrote:
> Add device-tree binding documentation for the MI0283QT display panel.
>
> Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
> ---
>
> Datasheet: https://cdn-shop.adafruit.com/datasheets/MI0283QT-11+V1.1.PDF
>
> .../bindings/display/multi-inno,mi0283qt.txt | 27 ++++++++++++++++++++++
> 1 file changed, 27 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/display/multi-inno,mi0283qt.txt
Acked-by: Rob Herring <robh@kernel.org>
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^ permalink raw reply [flat|nested] 45+ messages in thread
* [PATCH v3 7/7] drm/tinydrm: Add support for Multi-Inno MI0283QT display
2017-01-31 16:03 [PATCH v3 0/7] drm: Add support for tiny LCD displays Noralf Trønnes
` (5 preceding siblings ...)
2017-01-31 16:03 ` [PATCH v3 6/7] dt-bindings: Add Multi-Inno MI0283QT binding Noralf Trønnes
@ 2017-01-31 16:03 ` Noralf Trønnes
[not found] ` <20170131160319.9695-8-noralf-L59+Z2yzLopAfugRpC6u6w@public.gmane.org>
2017-02-07 12:00 ` [PATCH v3 0/7] drm: Add support for tiny LCD displays Thierry Reding
7 siblings, 1 reply; 45+ messages in thread
From: Noralf Trønnes @ 2017-01-31 16:03 UTC (permalink / raw)
To: dri-devel, devicetree; +Cc: thomas.petazzoni, linux-kernel
Add driver to support the Multi-Inno MI0283QT display panel.
It has an ILI9341 MIPI DBI compatible display controller.
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
---
MAINTAINERS | 6 +
drivers/gpu/drm/tinydrm/Kconfig | 8 ++
drivers/gpu/drm/tinydrm/Makefile | 3 +
drivers/gpu/drm/tinydrm/mi0283qt.c | 279 +++++++++++++++++++++++++++++++++++++
include/drm/tinydrm/ili9341.h | 54 +++++++
5 files changed, 350 insertions(+)
create mode 100644 drivers/gpu/drm/tinydrm/mi0283qt.c
create mode 100644 include/drm/tinydrm/ili9341.h
diff --git a/MAINTAINERS b/MAINTAINERS
index d935135..5c4666b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4278,6 +4278,12 @@ S: Supported
F: drivers/gpu/drm/mediatek/
F: Documentation/devicetree/bindings/display/mediatek/
+DRM DRIVER FOR MI0283QT
+M: Noralf Trønnes <noralf@tronnes.org>
+S: Maintained
+F: drivers/gpu/drm/tinydrm/mi0283qt.c
+F: Documentation/devicetree/bindings/display/multi-inno,mi0283qt.txt
+
DRM DRIVER FOR MSM ADRENO GPU
M: Rob Clark <robdclark@gmail.com>
L: linux-arm-msm@vger.kernel.org
diff --git a/drivers/gpu/drm/tinydrm/Kconfig b/drivers/gpu/drm/tinydrm/Kconfig
index 128d2f3..d3161fd 100644
--- a/drivers/gpu/drm/tinydrm/Kconfig
+++ b/drivers/gpu/drm/tinydrm/Kconfig
@@ -9,3 +9,11 @@ menuconfig DRM_TINYDRM
config TINYDRM_MIPI_DBI
tristate
+
+config TINYDRM_MI0283QT
+ tristate "DRM support for MI0283QT"
+ depends on DRM_TINYDRM && SPI
+ select TINYDRM_MIPI_DBI
+ help
+ DRM driver for the Multi-Inno MI0283QT display panel
+ If M is selected the module will be called mi0283qt.
diff --git a/drivers/gpu/drm/tinydrm/Makefile b/drivers/gpu/drm/tinydrm/Makefile
index fe5d4c6..7a3604c 100644
--- a/drivers/gpu/drm/tinydrm/Makefile
+++ b/drivers/gpu/drm/tinydrm/Makefile
@@ -2,3 +2,6 @@ obj-$(CONFIG_DRM_TINYDRM) += core/
# Controllers
obj-$(CONFIG_TINYDRM_MIPI_DBI) += mipi-dbi.o
+
+# Displays
+obj-$(CONFIG_TINYDRM_MI0283QT) += mi0283qt.o
diff --git a/drivers/gpu/drm/tinydrm/mi0283qt.c b/drivers/gpu/drm/tinydrm/mi0283qt.c
new file mode 100644
index 0000000..b29fe86
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/mi0283qt.c
@@ -0,0 +1,279 @@
+/*
+ * DRM driver for Multi-Inno MI0283QT panels
+ *
+ * Copyright 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/tinydrm/ili9341.h>
+#include <drm/tinydrm/mipi-dbi.h>
+#include <drm/tinydrm/tinydrm-helpers.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+#include <video/mipi_display.h>
+
+static int mi0283qt_init(struct mipi_dbi *mipi)
+{
+ struct tinydrm_device *tdev = &mipi->tinydrm;
+ struct device *dev = tdev->drm->dev;
+ u8 addr_mode;
+ int ret;
+
+ DRM_DEBUG_KMS("\n");
+
+ ret = regulator_enable(mipi->regulator);
+ if (ret) {
+ dev_err(dev, "Failed to enable regulator %d\n", ret);
+ return ret;
+ }
+
+ /* Avoid flicker by skipping setup if the bootloader has done it */
+ if (mipi_dbi_display_is_on(mipi))
+ return 0;
+
+ mipi_dbi_hw_reset(mipi);
+ ret = mipi_dbi_command(mipi, MIPI_DCS_SOFT_RESET);
+ if (ret) {
+ dev_err(dev, "Error sending command %d\n", ret);
+ regulator_disable(mipi->regulator);
+ return ret;
+ }
+
+ msleep(20);
+
+ mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);
+
+ mipi_dbi_command(mipi, ILI9341_PWCTRLB, 0x00, 0x83, 0x30);
+ mipi_dbi_command(mipi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);
+ mipi_dbi_command(mipi, ILI9341_DTCTRLA, 0x85, 0x01, 0x79);
+ mipi_dbi_command(mipi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);
+ mipi_dbi_command(mipi, ILI9341_PUMPCTRL, 0x20);
+ mipi_dbi_command(mipi, ILI9341_DTCTRLB, 0x00, 0x00);
+
+ /* Power Control */
+ mipi_dbi_command(mipi, ILI9341_PWCTRL1, 0x26);
+ mipi_dbi_command(mipi, ILI9341_PWCTRL2, 0x11);
+ /* VCOM */
+ mipi_dbi_command(mipi, ILI9341_VMCTRL1, 0x35, 0x3e);
+ mipi_dbi_command(mipi, ILI9341_VMCTRL2, 0xbe);
+
+ /* Memory Access Control */
+ mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
+
+ switch (mipi->rotation) {
+ default:
+ addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
+ ILI9341_MADCTL_MX;
+ break;
+ case 90:
+ addr_mode = ILI9341_MADCTL_MY;
+ break;
+ case 180:
+ addr_mode = ILI9341_MADCTL_MV;
+ break;
+ case 270:
+ addr_mode = ILI9341_MADCTL_MX;
+ break;
+ }
+ addr_mode |= ILI9341_MADCTL_BGR;
+ mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
+
+ /* Frame Rate */
+ mipi_dbi_command(mipi, ILI9341_FRMCTR1, 0x00, 0x1b);
+
+ /* Gamma */
+ mipi_dbi_command(mipi, ILI9341_EN3GAM, 0x08);
+ mipi_dbi_command(mipi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
+ mipi_dbi_command(mipi, ILI9341_PGAMCTRL,
+ 0x1f, 0x1a, 0x18, 0x0a, 0x0f, 0x06, 0x45, 0x87,
+ 0x32, 0x0a, 0x07, 0x02, 0x07, 0x05, 0x00);
+ mipi_dbi_command(mipi, ILI9341_NGAMCTRL,
+ 0x00, 0x25, 0x27, 0x05, 0x10, 0x09, 0x3a, 0x78,
+ 0x4d, 0x05, 0x18, 0x0d, 0x38, 0x3a, 0x1f);
+
+ /* DDRAM */
+ mipi_dbi_command(mipi, ILI9341_ETMOD, 0x07);
+
+ /* Display */
+ mipi_dbi_command(mipi, ILI9341_DISCTRL, 0x0a, 0x82, 0x27, 0x00);
+ mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
+ msleep(100);
+
+ mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
+ msleep(100);
+
+ return 0;
+}
+
+static void mi0283qt_fini(void *data)
+{
+ struct mipi_dbi *mipi = data;
+
+ DRM_DEBUG_KMS("\n");
+ regulator_disable(mipi->regulator);
+}
+
+static const struct drm_simple_display_pipe_funcs mi0283qt_pipe_funcs = {
+ .enable = mipi_dbi_pipe_enable,
+ .disable = mipi_dbi_pipe_disable,
+ .update = tinydrm_display_pipe_update,
+ .prepare_fb = tinydrm_display_pipe_prepare_fb,
+};
+
+static const struct drm_display_mode mi0283qt_mode = {
+ TINYDRM_MODE(320, 240, 58, 43),
+};
+
+static struct drm_driver mi0283qt_driver = {
+ .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
+ DRIVER_ATOMIC,
+ TINYDRM_GEM_DRIVER_OPS,
+ .lastclose = tinydrm_lastclose,
+ .debugfs_init = mipi_dbi_debugfs_init,
+ .name = "mi0283qt",
+ .desc = "Multi-Inno MI0283QT",
+ .date = "20160614",
+ .major = 1,
+ .minor = 0,
+};
+
+static const struct of_device_id mi0283qt_of_match[] = {
+ { .compatible = "multi-inno,mi0283qt" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, mi0283qt_of_match);
+
+static const struct spi_device_id mi0283qt_id[] = {
+ { "mi0283qt", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(spi, mi0283qt_id);
+
+static int mi0283qt_probe(struct spi_device *spi)
+{
+ struct device *dev = &spi->dev;
+ struct tinydrm_device *tdev;
+ struct mipi_dbi *mipi;
+ struct gpio_desc *dc;
+ u32 rotation = 0;
+ int ret;
+
+ mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
+ if (!mipi)
+ return -ENOMEM;
+
+ mipi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(mipi->reset)) {
+ dev_err(dev, "Failed to get gpio 'reset'\n");
+ return PTR_ERR(mipi->reset);
+ }
+
+ dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
+ if (IS_ERR(dc)) {
+ dev_err(dev, "Failed to get gpio 'dc'\n");
+ return PTR_ERR(dc);
+ }
+
+ mipi->regulator = devm_regulator_get(dev, "power");
+ if (IS_ERR(mipi->regulator))
+ return PTR_ERR(mipi->regulator);
+
+ mipi->backlight = tinydrm_of_find_backlight(dev);
+ if (IS_ERR(mipi->backlight))
+ return PTR_ERR(mipi->backlight);
+
+ device_property_read_u32(dev, "rotation", &rotation);
+
+ ret = mipi_dbi_spi_init(spi, mipi, dc, &mi0283qt_pipe_funcs,
+ &mi0283qt_driver, &mi0283qt_mode, rotation);
+ if (ret)
+ return ret;
+
+ ret = mi0283qt_init(mipi);
+ if (ret)
+ return ret;
+
+ /* use devres to fini after drm unregister (drv->remove is before) */
+ ret = devm_add_action(dev, mi0283qt_fini, mipi);
+ if (ret) {
+ mi0283qt_fini(mipi);
+ return ret;
+ }
+
+ tdev = &mipi->tinydrm;
+
+ ret = devm_tinydrm_register(tdev);
+ if (ret)
+ return ret;
+
+ spi_set_drvdata(spi, mipi);
+
+ DRM_DEBUG_DRIVER("Initialized %s:%s @%uMHz on minor %d\n",
+ tdev->drm->driver->name, dev_name(dev),
+ spi->max_speed_hz / 1000000,
+ tdev->drm->primary->index);
+
+ return 0;
+}
+
+static void mi0283qt_shutdown(struct spi_device *spi)
+{
+ struct mipi_dbi *mipi = spi_get_drvdata(spi);
+
+ tinydrm_shutdown(&mipi->tinydrm);
+}
+
+static int __maybe_unused mi0283qt_pm_suspend(struct device *dev)
+{
+ struct mipi_dbi *mipi = dev_get_drvdata(dev);
+ int ret;
+
+ ret = tinydrm_suspend(&mipi->tinydrm);
+ if (ret)
+ return ret;
+
+ mi0283qt_fini(mipi);
+
+ return 0;
+}
+
+static int __maybe_unused mi0283qt_pm_resume(struct device *dev)
+{
+ struct mipi_dbi *mipi = dev_get_drvdata(dev);
+ int ret;
+
+ ret = mi0283qt_init(mipi);
+ if (ret)
+ return ret;
+
+ return tinydrm_resume(&mipi->tinydrm);
+}
+
+static const struct dev_pm_ops mi0283qt_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(mi0283qt_pm_suspend, mi0283qt_pm_resume)
+};
+
+static struct spi_driver mi0283qt_spi_driver = {
+ .driver = {
+ .name = "mi0283qt",
+ .owner = THIS_MODULE,
+ .of_match_table = mi0283qt_of_match,
+ .pm = &mi0283qt_pm_ops,
+ },
+ .id_table = mi0283qt_id,
+ .probe = mi0283qt_probe,
+ .shutdown = mi0283qt_shutdown,
+};
+module_spi_driver(mi0283qt_spi_driver);
+
+MODULE_DESCRIPTION("Multi-Inno MI0283QT DRM driver");
+MODULE_AUTHOR("Noralf Trønnes");
+MODULE_LICENSE("GPL");
diff --git a/include/drm/tinydrm/ili9341.h b/include/drm/tinydrm/ili9341.h
new file mode 100644
index 0000000..807a09f
--- /dev/null
+++ b/include/drm/tinydrm/ili9341.h
@@ -0,0 +1,54 @@
+/*
+ * ILI9341 LCD controller
+ *
+ * Copyright 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_ILI9341_H
+#define __LINUX_ILI9341_H
+
+#define ILI9341_FRMCTR1 0xb1
+#define ILI9341_FRMCTR2 0xb2
+#define ILI9341_FRMCTR3 0xb3
+#define ILI9341_INVTR 0xb4
+#define ILI9341_PRCTR 0xb5
+#define ILI9341_DISCTRL 0xb6
+#define ILI9341_ETMOD 0xb7
+
+#define ILI9341_PWCTRL1 0xc0
+#define ILI9341_PWCTRL2 0xc1
+#define ILI9341_VMCTRL1 0xc5
+#define ILI9341_VMCTRL2 0xc7
+#define ILI9341_PWCTRLA 0xcb
+#define ILI9341_PWCTRLB 0xcf
+
+#define ILI9341_RDID1 0xda
+#define ILI9341_RDID2 0xdb
+#define ILI9341_RDID3 0xdc
+#define ILI9341_RDID4 0xd3
+
+#define ILI9341_PGAMCTRL 0xe0
+#define ILI9341_NGAMCTRL 0xe1
+#define ILI9341_DGAMCTRL1 0xe2
+#define ILI9341_DGAMCTRL2 0xe3
+#define ILI9341_DTCTRLA 0xe8
+#define ILI9341_DTCTRLB 0xea
+#define ILI9341_PWRSEQ 0xed
+
+#define ILI9341_EN3GAM 0xf2
+#define ILI9341_IFCTRL 0xf6
+#define ILI9341_PUMPCTRL 0xf7
+
+#define ILI9341_MADCTL_MH BIT(2)
+#define ILI9341_MADCTL_BGR BIT(3)
+#define ILI9341_MADCTL_ML BIT(4)
+#define ILI9341_MADCTL_MV BIT(5)
+#define ILI9341_MADCTL_MX BIT(6)
+#define ILI9341_MADCTL_MY BIT(7)
+
+#endif /* __LINUX_ILI9341_H */
--
2.10.2
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^ permalink raw reply related [flat|nested] 45+ messages in thread* Re: [PATCH v3 0/7] drm: Add support for tiny LCD displays
2017-01-31 16:03 [PATCH v3 0/7] drm: Add support for tiny LCD displays Noralf Trønnes
` (6 preceding siblings ...)
2017-01-31 16:03 ` [PATCH v3 7/7] drm/tinydrm: Add support for Multi-Inno MI0283QT display Noralf Trønnes
@ 2017-02-07 12:00 ` Thierry Reding
7 siblings, 0 replies; 45+ messages in thread
From: Thierry Reding @ 2017-02-07 12:00 UTC (permalink / raw)
To: Noralf Trønnes; +Cc: thomas.petazzoni, devicetree, linux-kernel, dri-devel
[-- Attachment #1.1: Type: text/plain, Size: 4797 bytes --]
On Tue, Jan 31, 2017 at 05:03:12PM +0100, Noralf Trønnes wrote:
> drm: Add support for tiny LCD displays
>
> This is an attempt at providing a DRM version of drivers/staging/fbtft.
>
> The tinydrm library provides a very simplified view of DRM in particular
> for tiny displays that has onboard video memory and is connected through
> a slow bus like SPI/I2C.
>
> The main change this time is adding 'rotation' as a common display
> Device Tree property.
>
>
> Noralf.
>
> Changes since version 2:
> - Remove fbdev after drm unregister, not before.
> - Added Documentation/devicetree/bindings/display/display.txt
>
> Changes since version 1:
> - Add tinydrm.rst
> - Set tdev->fbdev_cma=NULL on unregister (lastclose is called after that).
> - Remove some DRM_DEBUG*()
> - Write-combined memory has uncached reads, so speed up by copying/buffering
> one pixel line before conversion.
>
> Changes since RFC v2:
> - Rebased on new core helpers
> - Don't use drm_panel
> - Flush when the framebuffer is changed on the plane
> - Add devm_tinydrm_init()
> - Fix PRIME support, set vaddr
> - Use atomic helpers in suspend/resume
> - Add a tinydrm_connector with one display mode
> - Set mode_config.preferred_depth and use it for fbdev
> - Subclass tinydrm_device in drivers instead of bloating the structure
> - The PiTFT display uses a MI0283QT panel, write driver for that instead.
> - Drop homegrown lcdreg module, it ended up as a collection of special
> cases.
> - Add more documentation
>
> Changes since RFC v1:
> - Add fb_deferred_io support to drm_fb_helper and drm_fb_cma_helper,
> and use drm_fb_cma_helper instead.
> - Move display pipeline code to drm_simple_kms_helper.
> - Don't use (struct drm_driver *)->load().
> - Make tinydrm more like a library, exporting the internals.
> - Move the struct drm_driver definition from the tinydrm module to the
> driver using a helper macro: TINYDRM_DRM_DRIVER.
> - Remove dirtyfb() async code.
> - Added support for partial display updates.
>
>
> Noralf Trønnes (7):
> drm: Add DRM support for tiny LCD displays
> drm/tinydrm: Add helper functions
> drm/tinydrm: Add MIPI DBI support
> of: Add vendor prefix for Multi-Inno
> dt-bindings: display: Add common rotation property
> dt-bindings: Add Multi-Inno MI0283QT binding
> drm/tinydrm: Add support for Multi-Inno MI0283QT display
>
> .../devicetree/bindings/display/display.txt | 4 +
> .../bindings/display/multi-inno,mi0283qt.txt | 27 +
> .../devicetree/bindings/vendor-prefixes.txt | 1 +
> Documentation/gpu/index.rst | 1 +
> Documentation/gpu/tinydrm.rst | 42 +
> MAINTAINERS | 6 +
> drivers/gpu/drm/Kconfig | 2 +
> drivers/gpu/drm/Makefile | 1 +
> drivers/gpu/drm/tinydrm/Kconfig | 19 +
> drivers/gpu/drm/tinydrm/Makefile | 7 +
> drivers/gpu/drm/tinydrm/core/Makefile | 3 +
> drivers/gpu/drm/tinydrm/core/tinydrm-core.c | 377 ++++++++
> drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c | 462 +++++++++
> drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c | 234 +++++
> drivers/gpu/drm/tinydrm/mi0283qt.c | 279 ++++++
> drivers/gpu/drm/tinydrm/mipi-dbi.c | 1005 ++++++++++++++++++++
> include/drm/tinydrm/ili9341.h | 54 ++
> include/drm/tinydrm/mipi-dbi.h | 107 +++
> include/drm/tinydrm/tinydrm-helpers.h | 100 ++
> include/drm/tinydrm/tinydrm.h | 115 +++
> 20 files changed, 2846 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/display/display.txt
> create mode 100644 Documentation/devicetree/bindings/display/multi-inno,mi0283qt.txt
> 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-helpers.c
> create mode 100644 drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
> create mode 100644 drivers/gpu/drm/tinydrm/mi0283qt.c
> create mode 100644 drivers/gpu/drm/tinydrm/mipi-dbi.c
> create mode 100644 include/drm/tinydrm/ili9341.h
> create mode 100644 include/drm/tinydrm/mipi-dbi.h
> create mode 100644 include/drm/tinydrm/tinydrm-helpers.h
> create mode 100644 include/drm/tinydrm/tinydrm.h
The series:
Acked-by: Thierry Reding <treding@nvidia.com>
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^ permalink raw reply [flat|nested] 45+ messages in thread