tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/* SPDX-License-Identifier: MIT */
2/*
3 * Copyright (C) 2017 Google, Inc.
4 *
5 * Authors:
6 * Sean Paul <seanpaul@chromium.org>
7 */
8
9#ifndef _DRM_HDCP_H_INCLUDED_
10#define _DRM_HDCP_H_INCLUDED_
11
12/* Period of hdcp checks (to ensure we're still authenticated) */
13#define DRM_HDCP_CHECK_PERIOD_MS (128 * 16)
14
15/* Shared lengths/masks between HDMI/DVI/DisplayPort */
16#define DRM_HDCP_AN_LEN 8
17#define DRM_HDCP_BSTATUS_LEN 2
18#define DRM_HDCP_KSV_LEN 5
19#define DRM_HDCP_RI_LEN 2
20#define DRM_HDCP_V_PRIME_PART_LEN 4
21#define DRM_HDCP_V_PRIME_NUM_PARTS 5
22#define DRM_HDCP_NUM_DOWNSTREAM(x) (x & 0x7f)
23#define DRM_HDCP_MAX_CASCADE_EXCEEDED(x) (x & BIT(3))
24#define DRM_HDCP_MAX_DEVICE_EXCEEDED(x) (x & BIT(7))
25
26/* Slave address for the HDCP registers in the receiver */
27#define DRM_HDCP_DDC_ADDR 0x3A
28
29/* HDCP register offsets for HDMI/DVI devices */
30#define DRM_HDCP_DDC_BKSV 0x00
31#define DRM_HDCP_DDC_RI_PRIME 0x08
32#define DRM_HDCP_DDC_AKSV 0x10
33#define DRM_HDCP_DDC_AN 0x18
34#define DRM_HDCP_DDC_V_PRIME(h) (0x20 + h * 4)
35#define DRM_HDCP_DDC_BCAPS 0x40
36#define DRM_HDCP_DDC_BCAPS_REPEATER_PRESENT BIT(6)
37#define DRM_HDCP_DDC_BCAPS_KSV_FIFO_READY BIT(5)
38#define DRM_HDCP_DDC_BSTATUS 0x41
39#define DRM_HDCP_DDC_KSV_FIFO 0x43
40
41#endif