path: root/drivers/gpu/drm/qxl/qxl_display.c

/*
 * Copyright 2013 Red Hat Inc.
 *
 * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
 *
 * Authors: Dave Airlie
 *          Alon Levy
 */


#include "linux/crc32.h"

#include "qxl_drv.h"
#include "qxl_object.h"
#include "drm_crtc_helper.h"

static bool qxl_head_enabled(struct qxl_head *head)
{
	return head->width && head->height;
}

void qxl_alloc_client_monitors_config(struct qxl_device *qdev, unsigned count)
{
	if (qdev->client_monitors_config &&
	    count > qdev->client_monitors_config->count) {
		kfree(qdev->client_monitors_config);
		qdev->client_monitors_config = NULL;
	}
	if (!qdev->client_monitors_config) {
		qdev->client_monitors_config = kzalloc(
				sizeof(struct qxl_monitors_config) +
				sizeof(struct qxl_head) * count, GFP_KERNEL);
		if (!qdev->client_monitors_config) {
			qxl_io_log(qdev,
				   "%s: allocation failure for %u heads\n",
				   __func__, count);
			return;
		}
	}
	qdev->client_monitors_config->count = count;
}

static int qxl_display_copy_rom_client_monitors_config(struct qxl_device *qdev)
{
	int i;
	int num_monitors;
	uint32_t crc;

	num_monitors = qdev->rom->client_monitors_config.count;
	crc = crc32(0, (const uint8_t *)&qdev->rom->client_monitors_config,
		  sizeof(qdev->rom->client_monitors_config));
	if (crc != qdev->rom->client_monitors_config_crc) {
		qxl_io_log(qdev, "crc mismatch: have %X (%d) != %X\n", crc,
			   sizeof(qdev->rom->client_monitors_config),
			   qdev->rom->client_monitors_config_crc);
		return 1;
	}
	if (num_monitors > qdev->monitors_config->max_allowed) {
		DRM_DEBUG_KMS("client monitors list will be truncated: %d < %d\n",
			      qdev->monitors_config->max_allowed, num_monitors);
		num_monitors = qdev->monitors_config->max_allowed;
	} else {
		num_monitors = qdev->rom->client_monitors_config.count;
	}
	qxl_alloc_client_monitors_config(qdev, num_monitors);
	/* we copy max from the client but it isn't used */
	qdev->client_monitors_config->max_allowed =
				qdev->monitors_config->max_allowed;
	for (i = 0 ; i < qdev->client_monitors_config->count ; ++i) {
		struct qxl_urect *c_rect =
			&qdev->rom->client_monitors_config.heads[i];
		struct qxl_head *client_head =
			&qdev->client_monitors_config->heads[i];
		client_head->x = c_rect->left;
		client_head->y = c_rect->top;
		client_head->width = c_rect->right - c_rect->left;
		client_head->height = c_rect->bottom - c_rect->top;
		client_head->surface_id = 0;
		client_head->id = i;
		client_head->flags = 0;
		DRM_DEBUG_KMS("read %dx%d+%d+%d\n", client_head->width, client_head->height,
			  client_head->x, client_head->y);
	}
	return 0;
}

void qxl_display_read_client_monitors_config(struct qxl_device *qdev)
{

	while (qxl_display_copy_rom_client_monitors_config(qdev)) {
		qxl_io_log(qdev, "failed crc check for client_monitors_config,"
				 " retrying\n");
	}
	drm_helper_hpd_irq_event(qdev->ddev);
}

static int qxl_add_monitors_config_modes(struct drm_connector *connector)
{
	struct drm_device *dev = connector->dev;
	struct qxl_device *qdev = dev->dev_private;
	struct qxl_output *output = drm_connector_to_qxl_output(connector);
	int h = output->index;
	struct drm_display_mode *mode = NULL;
	struct qxl_head *head;

	if (!qdev->client_monitors_config)
		return 0;
	head = &qdev->client_monitors_config->heads[h];

	mode = drm_cvt_mode(dev, head->