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