intel_hti.c

 1// SPDX-License-Identifier: MIT
 2/*
 3 * Copyright © 2022 Intel Corporation
 4 */
 5
 6#include <drm/drm_device.h>
 7#include <drm/drm_print.h>
 8
 9#include "intel_de.h"
10#include "intel_display.h"
11#include "intel_hti.h"
12#include "intel_hti_regs.h"
13
14void intel_hti_init(struct intel_display *display)
15{
16	/*
17	 * If the platform has HTI, we need to find out whether it has reserved
18	 * any display resources before we create our display outputs.
19	 */
20	if (DISPLAY_INFO(display)->has_hti)
21		display->hti.state = intel_de_read(display, HDPORT_STATE);
22}
23
24bool intel_hti_uses_phy(struct intel_display *display, enum phy phy)
25{
26	if (drm_WARN_ON(display->drm, phy == PHY_NONE))
27		return false;
28
29	return display->hti.state & HDPORT_ENABLED &&
30		display->hti.state & HDPORT_DDI_USED(phy);
31}
32
33u32 intel_hti_dpll_mask(struct intel_display *display)
34{
35	if (!(display->hti.state & HDPORT_ENABLED))
36		return 0;
37
38	/*
39	 * Note: This is subtle. The values must coincide with what's defined
40	 * for the platform.
41	 */
42	return REG_FIELD_GET(HDPORT_DPLL_USED_MASK, display->hti.state);
43}