drm/msm/hdmi: Enable HPD after HDMI IRQ is set up

[linux/fpc-iii.git] / drivers / gpu / drm / sun4i / sun4i_drv.c

/*
 * Copyright (C) 2015 Free Electrons
 * Copyright (C) 2015 NextThing Co
 *
 * Maxime Ripard <maxime.ripard@free-electrons.com>
 *
 * 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 <linux/component.h>
#include <linux/kfifo.h>
#include <linux/of_graph.h>
#include <linux/of_reserved_mem.h>

#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_of.h>

#include "sun4i_drv.h"
#include "sun4i_frontend.h"
#include "sun4i_framebuffer.h"
#include "sun4i_tcon.h"
#include "sun8i_tcon_top.h"

DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);

static struct drm_driver sun4i_drv_driver = {
        .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,

        /* Generic Operations */
        .lastclose              = drm_fb_helper_lastclose,
        .fops                   = &sun4i_drv_fops,
        .name                   = "sun4i-drm",
        .desc                   = "Allwinner sun4i Display Engine",
        .date                   = "20150629",
        .major                  = 1,
        .minor                  = 0,

        /* GEM Operations */
        .dumb_create            = drm_gem_cma_dumb_create,
        .gem_free_object_unlocked = drm_gem_cma_free_object,
        .gem_vm_ops             = &drm_gem_cma_vm_ops,

        /* PRIME Operations */
        .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,

        /* Frame Buffer Operations */
};

static void sun4i_remove_framebuffers(void)
{
        struct apertures_struct *ap;

        ap = alloc_apertures(1);
        if (!ap)
                return;

        /* The framebuffer can be located anywhere in RAM */
        ap->ranges[0].base = 0;
        ap->ranges[0].size = ~0;

        drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false);
        kfree(ap);
}

static int sun4i_drv_bind(struct device *dev)
{
        struct drm_device *drm;
        struct sun4i_drv *drv;
        int ret;

        drm = drm_dev_alloc(&sun4i_drv_driver, dev);
        if (IS_ERR(drm))
                return PTR_ERR(drm);

        drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
        if (!drv) {
                ret = -ENOMEM;
                goto free_drm;
        }
        drm->dev_private = drv;
        INIT_LIST_HEAD(&drv->frontend_list);
        INIT_LIST_HEAD(&drv->engine_list);
        INIT_LIST_HEAD(&drv->tcon_list);

        ret = of_reserved_mem_device_init(dev);
        if (ret && ret != -ENODEV) {
                dev_err(drm->dev, "Couldn't claim our memory region\n");
                goto free_drm;
        }

        drm_mode_config_init(drm);

        ret = component_bind_all(drm->dev, drm);
        if (ret) {
                dev_err(drm->dev, "Couldn't bind all pipelines components\n");
                goto cleanup_mode_config;
        }

        /* drm_vblank_init calls kcalloc, which can fail */
        ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
        if (ret)
                goto cleanup_mode_config;

        drm->irq_enabled = true;

        /* Remove early framebuffers (ie. simplefb) */
        sun4i_remove_framebuffers();

        /* Create our framebuffer */
        ret = sun4i_framebuffer_init(drm);
        if (ret) {
                dev_err(drm->dev, "Couldn't create our framebuffer\n");
                goto cleanup_mode_config;
        }

        /* Enable connectors polling */
        drm_kms_helper_poll_init(drm);

        ret = drm_dev_register(drm, 0);
        if (ret)
                goto finish_poll;

        return 0;

finish_poll:
        drm_kms_helper_poll_fini(drm);
        sun4i_framebuffer_free(drm);
cleanup_mode_config:
        drm_mode_config_cleanup(drm);
        of_reserved_mem_device_release(dev);
free_drm:
        drm_dev_put(drm);
        return ret;
}

static void sun4i_drv_unbind(struct device *dev)
{
        struct drm_device *drm = dev_get_drvdata(dev);

        drm_dev_unregister(drm);
        drm_kms_helper_poll_fini(drm);
        sun4i_framebuffer_free(drm);
        drm_mode_config_cleanup(drm);
        of_reserved_mem_device_release(dev);
        drm_dev_put(drm);
}

static const struct component_master_ops sun4i_drv_master_ops = {
        .bind   = sun4i_drv_bind,
        .unbind = sun4i_drv_unbind,
};

static bool sun4i_drv_node_is_connector(struct device_node *node)
{
        return of_device_is_compatible(node, "hdmi-connector");
}

static bool sun4i_drv_node_is_frontend(struct device_node *node)
{
        return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
                of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
                of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
                of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
                of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||
                of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");
}

static bool sun4i_drv_node_is_deu(struct device_node *node)
{
        return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");
}

static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)
{
        if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))
                return !!of_match_node(sun4i_frontend_of_table, node);

        return false;
}

static bool sun4i_drv_node_is_tcon(struct device_node *node)
{
        return !!of_match_node(sun4i_tcon_of_table, node);
}

static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node)
{
        const struct of_device_id *match;

        match = of_match_node(sun4i_tcon_of_table, node);
        if (match) {
                struct sun4i_tcon_quirks *quirks;

                quirks = (struct sun4i_tcon_quirks *)match->data;

                return quirks->has_channel_0;
        }

        return false;
}

static bool sun4i_drv_node_is_tcon_top(struct device_node *node)
{
        return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
                !!of_match_node(sun8i_tcon_top_of_table, node);
}

static int compare_of(struct device *dev, void *data)
{
        DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
                         dev->of_node,
                         data);

        return dev->of_node == data;
}

/*
 * The encoder drivers use drm_of_find_possible_crtcs to get upstream
 * crtcs from the device tree using of_graph. For the results to be
 * correct, encoders must be probed/bound after _all_ crtcs have been
 * created. The existing code uses a depth first recursive traversal
 * of the of_graph, which means the encoders downstream of the TCON
 * get add right after the first TCON. The second TCON or CRTC will
 * never be properly associated with encoders connected to it.
 *
 * Also, in a dual display pipeline setup, both frontends can feed
 * either backend, and both backends can feed either TCON, we want
 * all components of the same type to be added before the next type
 * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
 * i.e. components of the same type are at the same depth when counted
 * from the frontend. The only exception is the third pipeline in
 * the A80 SoC, which we do not support anyway.
 *
 * Hence we can use a breadth first search traversal order to add
 * components. We do not need to check for duplicates. The component
 * matching system handles this for us.
 */
struct endpoint_list {
        DECLARE_KFIFO(fifo, struct device_node *, 16);
};

static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,
                                         struct device_node *node,
                                         int port_id)
{
        struct device_node *ep, *remote, *port;

        port = of_graph_get_port_by_id(node, port_id);
        if (!port) {
                DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id);
                return;
        }

        for_each_available_child_of_node(port, ep) {
                remote = of_graph_get_remote_port_parent(ep);
                if (!remote) {
                        DRM_DEBUG_DRIVER("Error retrieving the output node\n");
                        continue;
                }

                if (sun4i_drv_node_is_tcon(node)) {
                        /*
                         * TCON TOP is always probed before TCON. However, TCON
                         * points back to TCON TOP when it is source for HDMI.
                         * We have to skip it here to prevent infinite looping
                         * between TCON TOP and TCON.
                         */
                        if (sun4i_drv_node_is_tcon_top(remote)) {
                                DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n");
                                of_node_put(remote);
                                continue;
                        }

                        /*
                         * If the node is our TCON with channel 0, the first
                         * port is used for panel or bridges, and will not be
                         * part of the component framework.
                         */
                        if (sun4i_drv_node_is_tcon_with_ch0(node)) {
                                struct of_endpoint endpoint;

                                if (of_graph_parse_endpoint(ep, &endpoint)) {
                                        DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
                                        of_node_put(remote);
                                        continue;
                                }

                                if (!endpoint.id) {
                                        DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
                                        of_node_put(remote);
                                        continue;
                                }
                        }
                }

                kfifo_put(&list->fifo, remote);
        }
}

static int sun4i_drv_add_endpoints(struct device *dev,
                                   struct endpoint_list *list,
                                   struct component_match **match,
                                   struct device_node *node)
{
        int count = 0;

        /*
         * The frontend has been disabled in some of our old device
         * trees. If we find a node that is the frontend and is
         * disabled, we should just follow through and parse its
         * child, but without adding it to the component list.
         * Otherwise, we obviously want to add it to the list.
         */
        if (!sun4i_drv_node_is_frontend(node) &&
            !of_device_is_available(node))
                return 0;

        /*
         * The connectors will be the last nodes in our pipeline, we
         * can just bail out.
         */
        if (sun4i_drv_node_is_connector(node))
                return 0;

        /*
         * If the device is either just a regular device, or an
         * enabled frontend supported by the driver, we add it to our
         * component list.
         */
        if (!(sun4i_drv_node_is_frontend(node) ||
              sun4i_drv_node_is_deu(node)) ||
            (sun4i_drv_node_is_supported_frontend(node) &&
             of_device_is_available(node))) {
                /* Add current component */
                DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
                drm_of_component_match_add(dev, match, compare_of, node);
                count++;
        }

        /* each node has at least one output */
        sun4i_drv_traverse_endpoints(list, node, 1);

        /* TCON TOP has second and third output */
        if (sun4i_drv_node_is_tcon_top(node)) {
                sun4i_drv_traverse_endpoints(list, node, 3);
                sun4i_drv_traverse_endpoints(list, node, 5);
        }

        return count;
}

static int sun4i_drv_probe(struct platform_device *pdev)
{
        struct component_match *match = NULL;
        struct device_node *np = pdev->dev.of_node, *endpoint;
        struct endpoint_list list;
        int i, ret, count = 0;

        INIT_KFIFO(list.fifo);

        for (i = 0;; i++) {
                struct device_node *pipeline = of_parse_phandle(np,
                                                                "allwinner,pipelines",
                                                                i);
                if (!pipeline)
                        break;

                kfifo_put(&list.fifo, pipeline);
        }

        while (kfifo_get(&list.fifo, &endpoint)) {
                /* process this endpoint */
                ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
                                              endpoint);

                /* sun4i_drv_add_endpoints can fail to allocate memory */
                if (ret < 0)
                        return ret;

                count += ret;
        }

        if (count)
                return component_master_add_with_match(&pdev->dev,
                                                       &sun4i_drv_master_ops,
                                                       match);
        else
                return 0;
}

static int sun4i_drv_remove(struct platform_device *pdev)
{
        return 0;
}

static const struct of_device_id sun4i_drv_of_table[] = {
        { .compatible = "allwinner,sun4i-a10-display-engine" },
        { .compatible = "allwinner,sun5i-a10s-display-engine" },
        { .compatible = "allwinner,sun5i-a13-display-engine" },
        { .compatible = "allwinner,sun6i-a31-display-engine" },
        { .compatible = "allwinner,sun6i-a31s-display-engine" },
        { .compatible = "allwinner,sun7i-a20-display-engine" },
        { .compatible = "allwinner,sun8i-a33-display-engine" },
        { .compatible = "allwinner,sun8i-a83t-display-engine" },
        { .compatible = "allwinner,sun8i-h3-display-engine" },
        { .compatible = "allwinner,sun8i-v3s-display-engine" },
        { .compatible = "allwinner,sun9i-a80-display-engine" },
        { }
};
MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);

static struct platform_driver sun4i_drv_platform_driver = {
        .probe          = sun4i_drv_probe,
        .remove         = sun4i_drv_remove,
        .driver         = {
                .name           = "sun4i-drm",
                .of_match_table = sun4i_drv_of_table,
        },
};
module_platform_driver(sun4i_drv_platform_driver);

MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
MODULE_LICENSE("GPL");