/*
 * Copyright © 2017 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 */

#include "config.h"

#include <dirent.h>

#include "igt.h"
#include "igt_edid.h"
#include "igt_eld.h"

#define HDISPLAY_4K	3840
#define VDISPLAY_4K	2160

IGT_TEST_DESCRIPTION("Test that in-kernel EDID parsing is producing "
		     "expected results by forcing a HDMI connector "
		     "with a known EDID and checking that the metadata "
		     "exposed to user space matches.");

/**
 * This collection of tests performs EDID and status injection tests. Injection
 * forces a given EDID and status on a connector. The kernel will parse the
 * forced EDID and we will check whether correct metadata is exposed to
 * userspace.
 *
 * Currently, this can be used to test:
 *
 * - 4K modes exposed via KMS
 * - Audio capabilities of the monitor exposed via ALSA. EDID-Like Data (ELD)
 *   entries in /proc/asound are verified.
 */

/** get_connector: get the first disconnected HDMI connector */
static drmModeConnector *
get_connector(int drm_fd, drmModeRes *res)
{
	int i;
	drmModeConnector *connector;

	for (i = 0; i < res->count_connectors; i++) {

		connector =
			drmModeGetConnectorCurrent(drm_fd, res->connectors[i]);

		if (connector->connector_type == DRM_MODE_CONNECTOR_HDMIA)
			break;

		drmModeFreeConnector(connector);
		connector = NULL;
	}

	return connector;
}

static void
hdmi_inject_4k(int drm_fd, drmModeConnector *connector)
{
	const struct edid *edid;
	struct kmstest_connector_config config;
	int ret, cid, i, crtc_mask = -1;
	int fb_id;
	struct igt_fb fb;
	uint8_t found_4k_mode = 0;

	if (is_i915_device(drm_fd)) {
		uint32_t devid = intel_get_drm_devid(drm_fd);

		/* 4K requires at least HSW */
		igt_require(IS_HASWELL(devid) || intel_display_ver(devid) >= 8);
	}

	edid = igt_kms_get_4k_edid();
	kmstest_force_edid(drm_fd, connector, edid);

	if (!kmstest_force_connector(drm_fd, connector, FORCE_CONNECTOR_ON))
		igt_skip("Could not force connector on\n");

	cid = connector->connector_id;

	connector = drmModeGetConnectorCurrent(drm_fd, cid);

	for (i = 0; i < connector->count_modes; i++) {
		if (connector->modes[i].hdisplay == HDISPLAY_4K &&
		    connector->modes[i].vdisplay == VDISPLAY_4K) {
			found_4k_mode++;
			break;
		}
	}

	igt_assert(found_4k_mode);

	/* create a configuration */
	ret = kmstest_get_connector_config(drm_fd, cid, crtc_mask, &config);
	igt_assert(ret);

	igt_info("  ");
	kmstest_dump_mode(&connector->modes[i]);

	/* create framebuffer */
	fb_id = igt_create_fb(drm_fd, connector->modes[i].hdisplay,
			      connector->modes[i].vdisplay,
			      DRM_FORMAT_XRGB8888,
			      DRM_FORMAT_MOD_LINEAR, &fb);

	ret = drmModeSetCrtc(drm_fd, config.crtc->crtc_id, fb_id, 0, 0,
			     &connector->connector_id, 1,
			     &connector->modes[i]);

	igt_assert(ret == 0);

	igt_remove_fb(drm_fd, &fb);

	kmstest_force_connector(drm_fd, connector, FORCE_CONNECTOR_UNSPECIFIED);
	kmstest_force_edid(drm_fd, connector, NULL);
}

static void
hdmi_inject_audio(int drm_fd, drmModeConnector *connector)
{
	const struct edid *edid;
	int fb_id, cid, ret, crtc_mask = -1;
	struct igt_fb fb;
	struct kmstest_connector_config config;

	igt_require(eld_is_supported());

	edid = igt_kms_get_hdmi_audio_edid();
	kmstest_force_edid(drm_fd, connector, edid);

	if (!kmstest_force_connector(drm_fd, connector, FORCE_CONNECTOR_ON))
		igt_skip("Could not force connector on\n");

	cid = connector->connector_id;
	connector = drmModeGetConnectorCurrent(drm_fd, cid);

	/* create a configuration */
	ret = kmstest_get_connector_config(drm_fd, cid, crtc_mask, &config);
	igt_assert(ret);

	/*
	 * Create a framebuffer as to allow the kernel to enable the pipe and
	 * enable the audio encoder.
	 */
	fb_id = igt_create_fb(drm_fd, connector->modes[0].hdisplay,
			      connector->modes[0].vdisplay,
			      DRM_FORMAT_XRGB8888,
			      DRM_FORMAT_MOD_LINEAR, &fb);

	ret = drmModeSetCrtc(drm_fd, config.crtc->crtc_id, fb_id, 0, 0,
			     &connector->connector_id, 1,
			     &connector->modes[0]);


	igt_assert(ret == 0);

	/*
	 * Test if we have /proc/asound/HDMI/eld#0.0 and is its contents are
	 * valid.
	 */
	igt_assert(eld_has_igt());

	igt_remove_fb(drm_fd, &fb);

	igt_info("  ");
	kmstest_dump_mode(&connector->modes[0]);

	kmstest_force_connector(drm_fd, connector, FORCE_CONNECTOR_UNSPECIFIED);
	kmstest_force_edid(drm_fd, connector, NULL);
}

igt_main
{
	int drm_fd;
	drmModeRes *res;
	drmModeConnector *connector;

	igt_fixture {
		drm_fd = drm_open_driver_master(DRIVER_ANY);

		res = drmModeGetResources(drm_fd);
		igt_require(res);

		connector = get_connector(drm_fd, res);
		igt_require(connector);

		kmstest_unset_all_crtcs(drm_fd, res);
	}

	igt_describe("Make sure that 4K modes exposed by DRM match the "
                     "forced EDID and modesetting using it succeed.");
	igt_subtest("inject-4k")
		hdmi_inject_4k(drm_fd, connector);

	igt_describe("Make sure that audio information exposed by ALSA "
		     "match the forced EDID.");
	igt_subtest("inject-audio")
		hdmi_inject_audio(drm_fd, connector);

	igt_fixture {
		drmModeFreeConnector(connector);
		close(drm_fd);
	}
}
