/*
* Freescale i.MX drm driver
*
* Copyright (C) 2011 Sascha Hauer, Pengutronix
*
* 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.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/component.h>
#include <linux/device.h>
#include <linux/dma-buf.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <drm/drmP.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_of.h>
#include <video/imx-ipu-v3.h>
#include "imx-drm.h"
#include "ipuv3-plane.h"
#define MAX_CRTC 4
struct imx_drm_device {
struct drm_device *drm;
unsigned int pipes;
struct drm_fbdev_cma *fbhelper;
struct drm_atomic_state *state;
};
#if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
static int legacyfb_depth = 16;
module_param(legacyfb_depth, int, 0444);
#endif
static void imx_drm_driver_lastclose(struct drm_device *drm)
{
struct imx_drm_device *imxdrm = drm->dev_private;
drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
}
DEFINE_DRM_GEM_CMA_FOPS(imx_drm_driver_fops);
void imx_drm_connector_destroy(struct drm_connector *connector)
{
drm_connector_unregister(connector);
drm_connector_cleanup(connector);
}
EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
void imx_drm_encoder_destroy(struct drm_encoder *encoder)
{
drm_encoder_cleanup(encoder);
}
EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);
static void imx_drm_output_poll_changed(struct drm_device *drm)
{
struct imx_drm_device *imxdrm = drm->dev_private;
drm_fbdev_cma_hotplug_event(imxdrm->fbhelper);
}
static int imx_drm_atomic_check(struct drm_device *dev,
struct drm_atomic_state *state)
{
int ret;
ret = drm_atomic_helper_check_modeset(dev, state);
if (ret)
return ret;
ret = drm_atomic_helper_check_planes(dev, state);
if (ret)
return ret;
/*
* Check modeset again in case crtc_state->mode_changed is
* updated in plane's ->atomic_check callback.
*/
ret = drm_atomic_helper_check_modeset(dev, state);
if (ret)
return ret;
/* Assign PRG/PRE channels and check if all constrains are satisfied. */
ret = ipu_planes_assign_pre(dev, state);
if (ret)
return ret;
return ret;
}
static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
.fb_create = drm_fb_cma_create,
.output_poll_changed = imx_drm_output_poll_changed,
.atomic_check = imx_drm_atomic_check,
.atomic_commit = drm_atomic_helper_commit,
};
static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
{
struct drm_device *dev = state->dev;
struct drm_plane *plane;
struct drm_plane_state *old_plane_state, *new_plane_state;
bool plane_disabling = false;
int i;
drm_atomic_helper_commit_modeset_disables(dev, state);
drm_atomic_helper_commit_planes(dev, state,
DRM_PLANE_COMMIT_ACTIVE_ONLY |
DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET);
drm_atomic_helper_commit_modeset_enables(dev, state);
for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
if (drm_atomic_plane_disabling(old_plane_state, new_plane_state))
plane_disabling = true;
}
if (plane_disabling) {
drm_atomic_helper_wait_for_vblanks(dev, state);
for_each_old_plane_in_state(state, plane, old_plane_state, i)
ipu_plane_disable_deferred(plane);
}
drm_atomic_helper_commit_hw_done(state);
}
static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
.atomic_commit_tail = imx_drm_atomic_commit_tail,
};
int imx_drm_encoder_parse_of(struct drm_device *drm,
struct drm_encoder *encoder, struct device_node *np)
{
uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);
/*
* If we failed to find the CRTC(s) which this encoder is
* supposed to be connected to, it's because the CRTC has
* not been registered yet. Defer probing, and hope that
* the required CRTC is added later.
*/
if (crtc_mask == 0)
return -EPROBE_DEFER;
encoder->possible_crtcs = crtc_mask;
/* FIXME: this is the mask of outputs which can clone this output. */
encoder->possible_clones = ~0;
return 0;
}
EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
static const struct drm_ioctl_desc imx_drm_ioctls[] = {
/* none so far */
};
static struct drm_driver imx_drm_driver = {
.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
DRIVER_ATOMIC,
.lastclose = imx_drm_driver_lastclose,
.gem_free_object_unlocked = drm_gem_cma_free_object,
.gem_vm_ops = &drm_gem_cma_vm_ops,
.dumb_create = drm_gem_cma_dumb_create,
.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 = drm_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,
.ioctls = imx_drm_ioctls,
.num_ioctls = ARRAY_SIZE(imx_drm_ioctls),
.fops = &imx_drm_driver_fops,
.name = "imx-drm",
.desc = "i.MX DRM graphics",
.date = "20120507",
.major = 1,
.minor = 0,
.patchlevel = 0,
};
static int compare_of(struct device *dev, void *data)
{
struct device_node *np = data;
/* Special case for DI, dev->of_node may not be set yet */
if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
struct ipu_client_platformdata *pdata = dev->platform_data;
return pdata->of_node == np;
}
/* Special case for LDB, one device for two channels */
if (of_node_cmp(np->name, "lvds-channel") == 0) {
np = of_get_parent(np);
of_node_put(np);
}
return dev->of_node == np;
}
static int imx_drm_bind(struct device *dev)
{
struct drm_device *drm;
struct imx_drm_device *imxdrm;
int ret;
drm = drm_dev_alloc(&imx_drm_driver, dev);
if (IS_ERR(drm))
return PTR_ERR(drm);
imxdrm = devm_kzalloc(dev, sizeof(*imxdrm), GFP_KERNEL);
if (!imxdrm) {
ret = -ENOMEM;
goto err_unref;
}
imxdrm->drm = drm;
drm->dev_private = imxdrm;
/*
* enable drm irq mode.
* - with irq_enabled = true, we can use the vblank feature.
*
* P.S. note that we wouldn't use drm irq handler but
* just specific driver own one instead because
* drm framework supports only one irq handler and
* drivers can well take care of their interrupts
*/
drm->irq_enabled = true;
/*
* set max width and height as default value(4096x4096).
* this value would be used to check framebuffer size limitation
* at drm_mode_addfb().
*/
drm->mode_config.min_width = 1;
drm->mode_config.min_height = 1;
drm->mode_config.max_width = 4096;
drm->mode_config.max_height = 4096;
drm->mode_config.funcs = &imx_drm_mode_config_funcs;
drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
drm_mode_config_init(drm);
ret = drm_vblank_init(drm, MAX_CRTC);
if (ret)
goto err_kms;
dev_set_drvdata(dev, drm);
/* Now try and bind all our sub-components */
ret = component_bind_all(dev, drm);
if (ret)
goto err_kms;
drm_mode_config_reset(drm);
/*
* All components are now initialised, so setup the fb helper.
* The fb helper takes copies of key hardware information, so the
* crtcs/connectors/encoders must not change after this point.
*/
#if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
if (legacyfb_depth != 16 && legacyfb_depth != 32) {
dev_warn(dev, "Invalid legacyfb_depth. Defaulting to 16bpp\n");
legacyfb_depth = 16;
}
imxdrm->fbhelper = drm_fbdev_cma_init(drm, legacyfb_depth, MAX_CRTC);
if (IS_ERR(imxdrm->fbhelper)) {
ret = PTR_ERR(imxdrm->fbhelper);
imxdrm->fbhelper = NULL;
goto err_unbind;
}
#endif
drm_kms_helper_poll_init(drm);
ret = drm_dev_register(drm, 0);
if (ret)
goto err_fbhelper;
return 0;
err_fbhelper:
drm_kms_helper_poll_fini(drm);
#if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
if (imxdrm->fbhelper)
drm_fbdev_cma_fini(imxdrm->fbhelper);
err_unbind:
#endif
component_unbind_all(drm->dev, drm);
err_kms:
drm_mode_config_cleanup(drm);
err_unref:
drm_dev_unref(drm);
return ret;
}
static void imx_drm_unbind(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
struct imx_drm_device *imxdrm = drm->dev_private;
drm_dev_unregister(drm);
drm_kms_helper_poll_fini(drm);
if (imxdrm->fbhelper)
drm_fbdev_cma_fini(imxdrm->fbhelper);
drm_mode_config_cleanup(drm);
component_unbind_all(drm->dev, drm);
dev_set_drvdata(dev, NULL);
drm_dev_unref(drm);
}
static const struct component_master_ops imx_drm_ops = {
.bind = imx_drm_bind,
.unbind = imx_drm_unbind,
};
static int imx_drm_platform_probe(struct platform_device *pdev)
{
int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
if (!ret)
ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
return ret;
}
static int imx_drm_platform_remove(struct platform_device *pdev)
{
component_master_del(&pdev->dev, &imx_drm_ops);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int imx_drm_suspend(struct device *dev)
{
struct drm_device *drm_dev = dev_get_drvdata(dev);
struct imx_drm_device *imxdrm;
/* The drm_dev is NULL before .load hook is called */
if (drm_dev == NULL)
return 0;
drm_kms_helper_poll_disable(drm_dev);
imxdrm = drm_dev->dev_private;
imxdrm->state = drm_atomic_helper_suspend(drm_dev);
if (IS_ERR(imxdrm->state)) {
drm_kms_helper_poll_enable(drm_dev);
return PTR_ERR(imxdrm->state);
}
return 0;
}
static int imx_drm_resume(struct device *dev)
{
struct drm_device *drm_dev = dev_get_drvdata(dev);
struct imx_drm_device *imx_drm;
if (drm_dev == NULL)
return 0;
imx_drm = drm_dev->dev_private;
drm_atomic_helper_resume(drm_dev, imx_drm->state);
drm_kms_helper_poll_enable(drm_dev);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
static const struct of_device_id imx_drm_dt_ids[] = {
{ .compatible = "fsl,imx-display-subsystem", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
static struct platform_driver imx_drm_pdrv = {
.probe = imx_drm_platform_probe,
.remove = imx_drm_platform_remove,
.driver = {
.name = "imx-drm",
.pm = &imx_drm_pm_ops,
.of_match_table = imx_drm_dt_ids,
},
};
static struct platform_driver * const drivers[] = {
&imx_drm_pdrv,
&ipu_drm_driver,
};
static int __init imx_drm_init(void)
{
return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
}
module_init(imx_drm_init);
static void __exit imx_drm_exit(void)
{
platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
}
module_exit(imx_drm_exit);
MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
MODULE_DESCRIPTION("i.MX drm driver core");
MODULE_LICENSE("GPL");
