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Merge tag 'drm-tinydrm-2017-02-18' of https://github.com/notro/linux into drm-next

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Add tinydrm

* tag 'drm-tinydrm-2017-02-18' of https://github.com/notro/linux:
  drm/tinydrm: Add support for Multi-Inno MI0283QT display
  dt-bindings: Add Multi-Inno MI0283QT binding
  dt-bindings: display/panel: Add common rotation property
  of: Add vendor prefix for Multi-Inno
  drm/tinydrm: Add MIPI DBI support
  drm/tinydrm: Add helper functions
  drm: Add DRM support for tiny LCD displays
This commit is contained in:
Dave Airlie 2017-02-23 11:05:54 +10:00
commit a5eb76d9c8
20 changed files with 2845 additions and 0 deletions
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27
Documentation/devicetree/bindings/display/multi-inno,mi0283qt.txt Normal file
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@ -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>;
};

4
Documentation/devicetree/bindings/display/panel/panel.txt Normal file
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@ -0,0 +1,4 @@
Common display properties
-------------------------
- rotation: Display rotation in degrees counter clockwise (0,90,180,270)

1
Documentation/devicetree/bindings/vendor-prefixes.txt
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@ -187,6 +187,7 @@ 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.

1
Documentation/gpu/index.rst
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@ -11,6 +11,7 @@ Linux GPU Driver Developer's Guide
drm-kms-helpers
drm-uapi
i915
tinydrm
vga-switcheroo
vgaarbiter

42
Documentation/gpu/tinydrm.rst Normal file
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@ -0,0 +1,42 @@
==========================
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:
Additional helpers
==================
.. kernel-doc:: include/drm/tinydrm/tinydrm-helpers.h
:internal:
.. 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:

6
MAINTAINERS
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@ -4245,6 +4245,12 @@ 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

2
drivers/gpu/drm/Kconfig
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@ -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

1
drivers/gpu/drm/Makefile
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@ -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/

21
drivers/gpu/drm/tinydrm/Kconfig Normal file
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menuconfig DRM_TINYDRM
tristate "Support for simple displays"
depends on DRM
select DRM_KMS_HELPER
select DRM_KMS_CMA_HELPER
select BACKLIGHT_LCD_SUPPORT
select BACKLIGHT_CLASS_DEVICE
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
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.

7
drivers/gpu/drm/tinydrm/Makefile Normal file
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@ -0,0 +1,7 @@
obj-$(CONFIG_DRM_TINYDRM) += core/
# Controllers
obj-$(CONFIG_TINYDRM_MIPI_DBI) += mipi-dbi.o
# Displays
obj-$(CONFIG_TINYDRM_MI0283QT) += mi0283qt.o

3
drivers/gpu/drm/tinydrm/core/Makefile Normal file
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@ -0,0 +1,3 @@
tinydrm-y := tinydrm-core.o tinydrm-pipe.o tinydrm-helpers.o
obj-$(CONFIG_DRM_TINYDRM) += tinydrm.o

376
drivers/gpu/drm/tinydrm/core/tinydrm-core.c Normal file
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@ -0,0 +1,376 @@
/*
* Copyright (C) 2016 Noralf Trønnes
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/tinydrm/tinydrm.h>
#include <linux/device.h>
#include <linux/dma-buf.h>
/**
* DOC: overview
*
* This library provides driver helpers for very simple display hardware.
*
* It is based on &drm_simple_display_pipe coupled with a &drm_connector which
* has only one fixed &drm_display_mode. The framebuffers are backed by the
* cma helper and have support for framebuffer flushing (dirty).
* fbdev support is also included.
*
*/
/**
* DOC: core
*
* The driver allocates &tinydrm_device, initializes it using
* devm_tinydrm_init(), sets up the pipeline using tinydrm_display_pipe_init()
* and registers the DRM device using devm_tinydrm_register().
*/
/**
* tinydrm_lastclose - DRM lastclose helper
* @drm: DRM device
*
* This function ensures that fbdev is restored when drm_lastclose() is called
* on the last drm_release(). Drivers can use this as their
* &drm_driver->lastclose callback.
*/
void tinydrm_lastclose(struct drm_device *drm)
{
struct tinydrm_device *tdev = drm->dev_private;
DRM_DEBUG_KMS("\n");
drm_fbdev_cma_restore_mode(tdev->fbdev_cma);
}
EXPORT_SYMBOL(tinydrm_lastclose);
/**
* tinydrm_gem_cma_prime_import_sg_table - Produce a CMA GEM object from
* another driver's scatter/gather table of pinned pages
* @drm: DRM device to import into
* @attach: DMA-BUF attachment
* @sgt: Scatter/gather table of pinned pages
*
* This function imports a scatter/gather table exported via DMA-BUF by
* another driver using drm_gem_cma_prime_import_sg_table(). It sets the
* kernel virtual address on the CMA object. Drivers should use this as their
* &drm_driver->gem_prime_import_sg_table callback if they need the virtual
* address. tinydrm_gem_cma_free_object() should be used in combination with
* this function.
*
* Returns:
* A pointer to a newly created GEM object or an ERR_PTR-encoded negative
* error code on failure.
*/
struct drm_gem_object *
tinydrm_gem_cma_prime_import_sg_table(struct drm_device *drm,
struct dma_buf_attachment *attach,
struct sg_table *sgt)
{
struct drm_gem_cma_object *cma_obj;
struct drm_gem_object *obj;
void *vaddr;
vaddr = dma_buf_vmap(attach->dmabuf);
if (!vaddr) {
DRM_ERROR("Failed to vmap PRIME buffer\n");
return ERR_PTR(-ENOMEM);
}
obj = drm_gem_cma_prime_import_sg_table(drm, attach, sgt);
if (IS_ERR(obj)) {
dma_buf_vunmap(attach->dmabuf, vaddr);
return obj;
}
cma_obj = to_drm_gem_cma_obj(obj);
cma_obj->vaddr = vaddr;
return obj;
}
EXPORT_SYMBOL(tinydrm_gem_cma_prime_import_sg_table);
/**
* tinydrm_gem_cma_free_object - Free resources associated with a CMA GEM
* object
* @gem_obj: GEM object to free
*
* This function frees the backing memory of the CMA GEM object, cleans up the
* GEM object state and frees the memory used to store the object itself using
* drm_gem_cma_free_object(). It also handles PRIME buffers which has the kernel
* virtual address set by tinydrm_gem_cma_prime_import_sg_table(). Drivers
* can use this as their &drm_driver->gem_free_object callback.
*/
void tinydrm_gem_cma_free_object(struct drm_gem_object *gem_obj)
{
if (gem_obj->import_attach) {
struct drm_gem_cma_object *cma_obj;
cma_obj = to_drm_gem_cma_obj(gem_obj);
dma_buf_vunmap(gem_obj->import_attach->dmabuf, cma_obj->vaddr);
cma_obj->vaddr = NULL;
}
drm_gem_cma_free_object(gem_obj);
}
EXPORT_SYMBOL_GPL(tinydrm_gem_cma_free_object);
const struct file_operations tinydrm_fops = {
.owner = THIS_MODULE,
.open = drm_open,
.release = drm_release,
.unlocked_ioctl = drm_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = drm_compat_ioctl,
#endif
.poll = drm_poll,
.read = drm_read,
.llseek = no_llseek,
.mmap = drm_gem_cma_mmap,
};
EXPORT_SYMBOL(tinydrm_fops);
static struct drm_framebuffer *
tinydrm_fb_create(struct drm_device *drm, struct drm_file *file_priv,
const struct drm_mode_fb_cmd2 *mode_cmd)
{
struct tinydrm_device *tdev = drm->dev_private;
return drm_fb_cma_create_with_funcs(drm, file_priv, mode_cmd,
tdev->fb_funcs);
}
static const struct drm_mode_config_funcs tinydrm_mode_config_funcs = {
.fb_create = tinydrm_fb_create,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
static int tinydrm_init(struct device *parent, struct tinydrm_device *tdev,
const struct drm_framebuffer_funcs *fb_funcs,
struct drm_driver *driver)
{
struct drm_device *drm;
mutex_init(&tdev->dirty_lock);
tdev->fb_funcs = fb_funcs;
/*
* We don't embed drm_device, because that prevent us from using
* devm_kzalloc() to allocate tinydrm_device in the driver since
* drm_dev_unref() frees the structure. The devm_ functions provide
* for easy error handling.
*/
drm = drm_dev_alloc(driver, parent);
if (IS_ERR(drm))
return PTR_ERR(drm);
tdev->drm = drm;
drm->dev_private = tdev;
drm_mode_config_init(drm);
drm->mode_config.funcs = &tinydrm_mode_config_funcs;
return 0;
}
static void tinydrm_fini(struct tinydrm_device *tdev)
{
drm_mode_config_cleanup(tdev->drm);
mutex_destroy(&tdev->dirty_lock);
tdev->drm->dev_private = NULL;
drm_dev_unref(tdev->drm);
}
static void devm_tinydrm_release(void *data)
{
tinydrm_fini(data);
}
/**
* devm_tinydrm_init - Initialize tinydrm device
* @parent: Parent device object
* @tdev: tinydrm device
* @fb_funcs: Framebuffer functions
* @driver: DRM driver
*
* This function initializes @tdev, the underlying DRM device and it's
* mode_config. Resources will be automatically freed on driver detach (devres)
* using drm_mode_config_cleanup() and drm_dev_unref().
*
* Returns:
* Zero on success, negative error code on failure.
*/
int devm_tinydrm_init(struct device *parent, struct tinydrm_device *tdev,
const struct drm_framebuffer_funcs *fb_funcs,
struct drm_driver *driver)
{
int ret;
ret = tinydrm_init(parent, tdev, fb_funcs, driver);
if (ret)
return ret;
ret = devm_add_action(parent, devm_tinydrm_release, tdev);
if (ret)
tinydrm_fini(tdev);
return ret;
}
EXPORT_SYMBOL(devm_tinydrm_init);
static int tinydrm_register(struct tinydrm_device *tdev)
{
struct drm_device *drm = tdev->drm;
int bpp = drm->mode_config.preferred_depth;
struct drm_fbdev_cma *fbdev;
int ret;
ret = drm_dev_register(tdev->drm, 0);
if (ret)
return ret;
fbdev = drm_fbdev_cma_init_with_funcs(drm, bpp ? bpp : 32,
drm->mode_config.num_connector,
tdev->fb_funcs);
if (IS_ERR(fbdev))
DRM_ERROR("Failed to initialize fbdev: %ld\n", PTR_ERR(fbdev));
else
tdev->fbdev_cma = fbdev;
return 0;
}
static void tinydrm_unregister(struct tinydrm_device *tdev)
{
struct drm_fbdev_cma *fbdev_cma = tdev->fbdev_cma;
drm_crtc_force_disable_all(tdev->drm);
/* don't restore fbdev in lastclose, keep pipeline disabled */
tdev->fbdev_cma = NULL;
drm_dev_unregister(tdev->drm);
if (fbdev_cma)
drm_fbdev_cma_fini(fbdev_cma);
}
static void devm_tinydrm_register_release(void *data)
{
tinydrm_unregister(data);
}
/**
* devm_tinydrm_register - Register tinydrm device
* @tdev: tinydrm device
*
* This function registers the underlying DRM device and fbdev.
* These resources will be automatically unregistered on driver detach (devres)
* and the display pipeline will be disabled.
*
* Returns:
* Zero on success, negative error code on failure.
*/
int devm_tinydrm_register(struct tinydrm_device *tdev)
{
struct device *dev = tdev->drm->dev;
int ret;
ret = tinydrm_register(tdev);
if (ret)
return ret;
ret = devm_add_action(dev, devm_tinydrm_register_release, tdev);
if (ret)
tinydrm_unregister(tdev);
return ret;
}
EXPORT_SYMBOL(devm_tinydrm_register);
/**
* tinydrm_shutdown - Shutdown tinydrm
* @tdev: tinydrm device
*
* This function makes sure that the display pipeline is disabled.
* Used by drivers in their shutdown callback to turn off the display
* on machine shutdown and reboot.
*/
void tinydrm_shutdown(struct tinydrm_device *tdev)
{
drm_crtc_force_disable_all(tdev->drm);
}
EXPORT_SYMBOL(tinydrm_shutdown);
/**
* tinydrm_suspend - Suspend tinydrm
* @tdev: tinydrm device
*
* Used in driver PM operations to suspend tinydrm.
* Suspends fbdev and DRM.
* Resume with tinydrm_resume().
*
* Returns:
* Zero on success, negative error code on failure.
*/
int tinydrm_suspend(struct tinydrm_device *tdev)
{
struct drm_atomic_state *state;
if (tdev->suspend_state) {
DRM_ERROR("Failed to suspend: state already set\n");
return -EINVAL;
}
drm_fbdev_cma_set_suspend_unlocked(tdev->fbdev_cma, 1);
state = drm_atomic_helper_suspend(tdev->drm);
if (IS_ERR(state)) {
drm_fbdev_cma_set_suspend_unlocked(tdev->fbdev_cma, 0);
return PTR_ERR(state);
}
tdev->suspend_state = state;
return 0;
}
EXPORT_SYMBOL(tinydrm_suspend);
/**
* tinydrm_resume - Resume tinydrm
* @tdev: tinydrm device
*
* Used in driver PM operations to resume tinydrm.
* Suspend with tinydrm_suspend().
*
* Returns:
* Zero on success, negative error code on failure.
*/
int tinydrm_resume(struct tinydrm_device *tdev)
{
struct drm_atomic_state *state = tdev->suspend_state;
int ret;
if (!state) {
DRM_ERROR("Failed to resume: state is not set\n");
return -EINVAL;
}
tdev->suspend_state = NULL;
ret = drm_atomic_helper_resume(tdev->drm, state);
if (ret) {
DRM_ERROR("Error resuming state: %d\n", ret);
return ret;
}
drm_fbdev_cma_set_suspend_unlocked(tdev->fbdev_cma, 0);
return 0;
}
EXPORT_SYMBOL(tinydrm_resume);
MODULE_LICENSE("GPL");

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drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c Normal file
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@ -0,0 +1,460 @@
/*
* 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);
/**
* 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);
#if IS_ENABLED(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 */

234
drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c Normal file
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/*
* 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);

279
drivers/gpu/drm/tinydrm/mi0283qt.c Normal file
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/*
* 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");

1005
drivers/gpu/drm/tinydrm/mipi-dbi.c Normal file
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54
include/drm/tinydrm/ili9341.h Normal file
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/*
* 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 */

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/*
* 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 */

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/*
* 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 */

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/*
* 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 */