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Date: Tue, 5 Dec 2017 14:36:39 +0530
From: Ramalingam C <ramalingam.c@...el.com>
To: Sean Paul <seanpaul@...omium.org>, dri-devel@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org, daniel.vetter@...el.com,
seanpaul@...gle.com, Chris Wilson <chris@...is-wilson.co.uk>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
David Airlie <airlied@...ux.ie>
Subject: Re: [PATCH v3 5/9] drm/i915: Add HDCP framework + base implementation
On Tuesday 05 December 2017 10:45 AM, Sean Paul wrote:
> This patch adds the framework required to add HDCP support to intel
> connectors. It implements Aksv loading from fuse, and parts 1/2/3
> of the HDCP authentication scheme.
>
> Note that without shim implementations, this does not actually implement
> HDCP. That will come in subsequent patches.
>
> Changes in v2:
> - Don't open code wait_fors (Chris)
> - drm_hdcp.c under MIT license (Daniel)
> - Move intel_hdcp_disable() call above ddi_disable (Ram)
> - Fix // comments (I wore a cone of shame for 12 hours to atone) (Daniel)
> - Justify intel_hdcp_shim with comments (Daniel)
> - Fixed async locking issues by adding hdcp_mutex (Daniel)
> - Don't alter connector_state in enable/disable (Daniel)
> Changes in v3:
> - Added hdcp_mutex/hdcp_value to make async reasonable
> - Added hdcp_prop_work to separate link checking & property setting
> - Added new helper for atomic_check state tracking (Daniel)
> - Moved enable/disable into atomic_commit with matching helpers
> - Moved intel_hdcp_check_link out of all locks when called from dp
> - Bumped up ksv_fifo timeout (noticed failure on one of my dongles)
>
> Cc: Chris Wilson <chris@...is-wilson.co.uk>
> Cc: Daniel Vetter <daniel.vetter@...el.com>
> Cc: Ramalingam C <ramalingam.c@...el.com>
> Signed-off-by: Sean Paul <seanpaul@...omium.org>
> ---
> drivers/gpu/drm/i915/Makefile | 1 +
> drivers/gpu/drm/i915/i915_reg.h | 83 ++++
> drivers/gpu/drm/i915/intel_atomic.c | 2 +
> drivers/gpu/drm/i915/intel_display.c | 14 +
> drivers/gpu/drm/i915/intel_drv.h | 88 +++++
> drivers/gpu/drm/i915/intel_hdcp.c | 731 +++++++++++++++++++++++++++++++++++
> 6 files changed, 919 insertions(+)
> create mode 100644 drivers/gpu/drm/i915/intel_hdcp.c
>
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index 42bc8bd4ff06..3facea4eefdb 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -107,6 +107,7 @@ i915-y += intel_audio.o \
> intel_fbc.o \
> intel_fifo_underrun.o \
> intel_frontbuffer.o \
> + intel_hdcp.o \
> intel_hotplug.o \
> intel_modes.o \
> intel_overlay.o \
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 09bf043c1c2e..2bd2cc8441d4 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -8034,6 +8034,7 @@ enum {
> #define GEN9_MEM_LATENCY_LEVEL_1_5_SHIFT 8
> #define GEN9_MEM_LATENCY_LEVEL_2_6_SHIFT 16
> #define GEN9_MEM_LATENCY_LEVEL_3_7_SHIFT 24
> +#define SKL_PCODE_LOAD_HDCP_KEYS 0x5
> #define SKL_PCODE_CDCLK_CONTROL 0x7
> #define SKL_CDCLK_PREPARE_FOR_CHANGE 0x3
> #define SKL_CDCLK_READY_FOR_CHANGE 0x1
> @@ -8335,6 +8336,88 @@ enum skl_power_gate {
> #define SKL_PW_TO_PG(pw) ((pw) - SKL_DISP_PW_1 + SKL_PG1)
> #define SKL_FUSE_PG_DIST_STATUS(pg) (1 << (27 - (pg)))
>
> +
> +/* HDCP Key Registers */
> +#define SKL_HDCP_KEY_CONF _MMIO(0x66c00)
> +#define SKL_HDCP_AKSV_SEND_TRIGGER BIT(31)
> +#define SKL_HDCP_CLEAR_KEYS_TRIGGER BIT(30)
> +#define SKL_HDCP_KEY_STATUS _MMIO(0x66c04)
> +#define SKL_HDCP_FUSE_IN_PROGRESS BIT(7)
> +#define SKL_HDCP_FUSE_ERROR BIT(6)
> +#define SKL_HDCP_FUSE_DONE BIT(5)
> +#define SKL_HDCP_KEY_LOAD_STATUS BIT(1)
> +#define SKL_HDCP_KEY_LOAD_DONE BIT(0)
> +#define SKL_HDCP_AKSV_LO _MMIO(0x66c10)
> +#define SKL_HDCP_AKSV_HI _MMIO(0x66c14)
> +
> +/* HDCP Repeater Registers */
> +#define SKL_HDCP_REP_CTL _MMIO(0x66d00)
> +#define SKL_HDCP_DDIB_REP_PRESENT BIT(30)
> +#define SKL_HDCP_DDIA_REP_PRESENT BIT(29)
> +#define SKL_HDCP_DDIC_REP_PRESENT BIT(28)
> +#define SKL_HDCP_DDID_REP_PRESENT BIT(27)
> +#define SKL_HDCP_DDIF_REP_PRESENT BIT(26)
> +#define SKL_HDCP_DDIE_REP_PRESENT BIT(25)
> +#define SKL_HDCP_DDIB_SHA1_M0 (1 << 20)
> +#define SKL_HDCP_DDIA_SHA1_M0 (2 << 20)
> +#define SKL_HDCP_DDIC_SHA1_M0 (3 << 20)
> +#define SKL_HDCP_DDID_SHA1_M0 (4 << 20)
> +#define SKL_HDCP_DDIF_SHA1_M0 (5 << 20)
> +#define SKL_HDCP_DDIE_SHA1_M0 (6 << 20) /* Bspec says 5? */
> +#define SKL_HDCP_SHA1_BUSY BIT(16)
> +#define SKL_HDCP_SHA1_READY BIT(17)
> +#define SKL_HDCP_SHA1_COMPLETE BIT(18)
> +#define SKL_HDCP_SHA1_V_MATCH BIT(19)
> +#define SKL_HDCP_SHA1_TEXT_32 (1 << 1)
> +#define SKL_HDCP_SHA1_COMPLETE_HASH (2 << 1)
> +#define SKL_HDCP_SHA1_TEXT_24 (4 << 1)
> +#define SKL_HDCP_SHA1_TEXT_16 (5 << 1)
> +#define SKL_HDCP_SHA1_TEXT_8 (6 << 1)
> +#define SKL_HDCP_SHA1_TEXT_0 (7 << 1)
> +#define SKL_HDCP_SHA_V_PRIME_H0 _MMIO(0x66d04)
> +#define SKL_HDCP_SHA_V_PRIME_H1 _MMIO(0x66d08)
> +#define SKL_HDCP_SHA_V_PRIME_H2 _MMIO(0x66d0C)
> +#define SKL_HDCP_SHA_V_PRIME_H3 _MMIO(0x66d10)
> +#define SKL_HDCP_SHA_V_PRIME_H4 _MMIO(0x66d14)
> +#define SKL_HDCP_SHA_V_PRIME(h) _MMIO((0x66d04 + h * 4))
> +#define SKL_HDCP_SHA_TEXT _MMIO(0x66d18)
> +
> +/* HDCP Auth Registers */
> +#define _SKL_PORTA_HDCP_AUTHENC 0x66800
> +#define _SKL_PORTB_HDCP_AUTHENC 0x66500
> +#define _SKL_PORTC_HDCP_AUTHENC 0x66600
> +#define _SKL_PORTD_HDCP_AUTHENC 0x66700
> +#define _SKL_PORTE_HDCP_AUTHENC 0x66A00
> +#define _SKL_PORTF_HDCP_AUTHENC 0x66900
> +#define _SKL_PORT_HDCP_AUTHENC(port, x) _MMIO(_PICK(port, \
> + _SKL_PORTA_HDCP_AUTHENC, \
> + _SKL_PORTB_HDCP_AUTHENC, \
> + _SKL_PORTC_HDCP_AUTHENC, \
> + _SKL_PORTD_HDCP_AUTHENC, \
> + _SKL_PORTE_HDCP_AUTHENC, \
> + _SKL_PORTF_HDCP_AUTHENC) + x)
> +#define SKL_PORT_HDCP_CONF(port) _SKL_PORT_HDCP_AUTHENC(port, 0x0)
> +#define SKL_HDCP_CONF_CAPTURE_AN BIT(0)
> +#define SKL_HDCP_CONF_AUTH_AND_ENC (BIT(1) | BIT(0))
> +#define SKL_PORT_HDCP_ANINIT(port) _SKL_PORT_HDCP_AUTHENC(port, 0x4)
> +#define SKL_PORT_HDCP_ANLO(port) _SKL_PORT_HDCP_AUTHENC(port, 0x8)
> +#define SKL_PORT_HDCP_ANHI(port) _SKL_PORT_HDCP_AUTHENC(port, 0xC)
> +#define SKL_PORT_HDCP_BKSVLO(port) _SKL_PORT_HDCP_AUTHENC(port, 0x10)
> +#define SKL_PORT_HDCP_BKSVHI(port) _SKL_PORT_HDCP_AUTHENC(port, 0x14)
> +#define SKL_PORT_HDCP_RPRIME(port) _SKL_PORT_HDCP_AUTHENC(port, 0x18)
> +#define SKL_PORT_HDCP_STATUS(port) _SKL_PORT_HDCP_AUTHENC(port, 0x1C)
> +#define SKL_HDCP_STATUS_STREAM_A_ENC BIT(31)
> +#define SKL_HDCP_STATUS_STREAM_B_ENC BIT(30)
> +#define SKL_HDCP_STATUS_STREAM_C_ENC BIT(29)
> +#define SKL_HDCP_STATUS_STREAM_D_ENC BIT(28)
> +#define SKL_HDCP_STATUS_AUTH BIT(21)
> +#define SKL_HDCP_STATUS_ENC BIT(20)
> +#define SKL_HDCP_STATUS_RI_MATCH BIT(19)
> +#define SKL_HDCP_STATUS_R0_READY BIT(18)
> +#define SKL_HDCP_STATUS_AN_READY BIT(17)
> +#define SKL_HDCP_STATUS_CIPHER BIT(16)
> +#define SKL_HDCP_STATUS_FRAME_CNT(x) ((x >> 8) & 0xff)
> +
> /* Per-pipe DDI Function Control */
> #define _TRANS_DDI_FUNC_CTL_A 0x60400
> #define _TRANS_DDI_FUNC_CTL_B 0x61400
> diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
> index 36d4e635e4ce..d452c327dc1d 100644
> --- a/drivers/gpu/drm/i915/intel_atomic.c
> +++ b/drivers/gpu/drm/i915/intel_atomic.c
> @@ -110,6 +110,8 @@ int intel_digital_connector_atomic_check(struct drm_connector *conn,
> to_intel_digital_connector_state(old_state);
> struct drm_crtc_state *crtc_state;
>
> + intel_hdcp_atomic_check(conn, old_state, new_state);
> +
> if (!new_state->crtc)
> return 0;
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 601c23be8264..f45c468abf98 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -12319,6 +12319,8 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
> struct drm_i915_private *dev_priv = to_i915(dev);
> struct drm_crtc_state *old_crtc_state, *new_crtc_state;
> struct drm_crtc *crtc;
> + struct drm_connector_state *old_conn_state, *new_conn_state;
> + struct drm_connector *connector;
> struct intel_crtc_state *intel_cstate;
> u64 put_domains[I915_MAX_PIPES] = {};
> int i;
> @@ -12408,9 +12410,17 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
> }
> }
>
> + for_each_oldnew_connector_in_state(state, connector, old_conn_state,
> + new_conn_state, i)
> + intel_hdcp_atomic_pre_commit(connector, old_conn_state,
> + new_conn_state);
> +
> /* Now enable the clocks, plane, pipe, and connectors that we set up. */
> dev_priv->display.update_crtcs(state);
>
> + for_each_new_connector_in_state(state, connector, new_conn_state, i)
> + intel_hdcp_atomic_commit(connector, new_conn_state);
> +
> /* FIXME: We should call drm_atomic_helper_commit_hw_done() here
> * already, but still need the state for the delayed optimization. To
> * fix this:
> @@ -15322,6 +15332,10 @@ static void intel_hpd_poll_fini(struct drm_device *dev)
> for_each_intel_connector_iter(connector, &conn_iter) {
> if (connector->modeset_retry_work.func)
> cancel_work_sync(&connector->modeset_retry_work);
> + if (connector->hdcp_shim) {
> + cancel_delayed_work_sync(&connector->hdcp_check_work);
> + cancel_work_sync(&connector->hdcp_prop_work);
> + }
> }
> drm_connector_list_iter_end(&conn_iter);
> }
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 852b3d161754..6f47a4227f5f 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -301,6 +301,76 @@ struct intel_panel {
> } backlight;
> };
>
> +/*
> + * This structure serves as a translation layer between the generic HDCP code
> + * and the bus-specific code. What that means is that HDCP over HDMI differs
> + * from HDCP over DP, so to account for these differences, we need to
> + * communicate with the receiver through this shim.
> + *
> + * For completeness, the 2 buses differ in the following ways:
> + * - DP AUX vs. DDC
> + * HDCP registers on the receiver are set via DP AUX for DP, and
> + * they are set via DDC for HDMI.
> + * - Receiver register offsets
> + * The offsets of the registers are different for DP vs. HDMI
> + * - Receiver register masks/offsets
> + * For instance, the ready bit for the KSV fifo is in a different
> + * place on DP vs HDMI
> + * - Receiver register names
> + * Seriously. In the DP spec, the 16-bit register containing
> + * downstream information is called BINFO, on HDMI it's called
> + * BSTATUS. To confuse matters further, DP has a BSTATUS register
> + * with a completely different definition.
> + * - KSV FIFO
> + * On HDMI, the ksv fifo is read all at once, whereas on DP it must
> + * be read 3 keys at a time
> + * - Aksv output
> + * Since Aksv is hidden in hardware, there's different procedures
> + * to send it over DP AUX vs DDC
> + */
> +struct intel_hdcp_shim {
> + /* Outputs the transmitter's An and Aksv values to the receiver. */
> + int (*write_an_aksv)(struct intel_digital_port *intel_dig_port, u8 *an);
> +
> + /* Reads the receiver's key selection vector */
> + int (*read_bksv)(struct intel_digital_port *intel_dig_port, u8 *bksv);
> +
> + /*
> + * Reads BINFO from DP receivers and BSTATUS from HDMI receivers. The
> + * definitions are the same in the respective specs, but the names are
> + * different. Call it BSTATUS since that's the name the HDMI spec
> + * uses and it was there first.
> + */
> + int (*read_bstatus)(struct intel_digital_port *intel_dig_port,
> + u8 *bstatus);
> +
> + /* Determines whether a repeater is present downstream */
> + int (*repeater_present)(struct intel_digital_port *intel_dig_port,
> + bool *repeater_present);
> +
> + /* Reads the receiver's Ri' value */
> + int (*read_ri_prime)(struct intel_digital_port *intel_dig_port, u8 *ri);
> +
> + /* Determines if the receiver's KSV FIFO is ready for consumption */
> + int (*read_ksv_ready)(struct intel_digital_port *intel_dig_port,
> + bool *ksv_ready);
> +
> + /* Reads the ksv fifo for num_downstream devices */
> + int (*read_ksv_fifo)(struct intel_digital_port *intel_dig_port,
> + int num_downstream, u8 *ksv_fifo);
> +
> + /* Reads a 32-bit part of V' from the receiver */
> + int (*read_v_prime_part)(struct intel_digital_port *intel_dig_port,
> + int i, u32 *part);
> +
> + /* Enables HDCP signalling on the port */
> + int (*toggle_signalling)(struct intel_digital_port *intel_dig_port,
> + bool enable);
> +
> + /* Ensures the link is still protected */
> + bool (*check_link)(struct intel_digital_port *intel_dig_port);
> +};
> +
> struct intel_connector {
> struct drm_connector base;
> /*
> @@ -332,6 +402,12 @@ struct intel_connector {
>
> /* Work struct to schedule a uevent on link train failure */
> struct work_struct modeset_retry_work;
> +
> + const struct intel_hdcp_shim *hdcp_shim;
> + struct mutex hdcp_mutex;
> + uint64_t hdcp_value; /* protected by hdcp_mutex */
> + struct delayed_work hdcp_check_work;
> + struct work_struct hdcp_prop_work;
> };
>
> struct intel_digital_connector_state {
> @@ -1763,6 +1839,18 @@ static inline void intel_backlight_device_unregister(struct intel_connector *con
> }
> #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
>
> +/* intel_hdcp.c */
> +void intel_hdcp_atomic_check(struct drm_connector *connector,
> + struct drm_connector_state *old_state,
> + struct drm_connector_state *new_state);
> +void intel_hdcp_atomic_pre_commit(struct drm_connector *connector,
> + struct drm_connector_state *old_state,
> + struct drm_connector_state *new_state);
> +void intel_hdcp_atomic_commit(struct drm_connector *connector,
> + struct drm_connector_state *new_state);
> +int intel_hdcp_check_link(struct intel_connector *connector);
> +void intel_hdcp_check_work(struct work_struct *work);
> +void intel_hdcp_prop_work(struct work_struct *work);
>
> /* intel_psr.c */
> void intel_psr_enable(struct intel_dp *intel_dp,
> diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
> new file mode 100644
> index 000000000000..4eef9505410f
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/intel_hdcp.c
> @@ -0,0 +1,731 @@
> +/*
> + * Copyright (C) 2017 Google, 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:
> + * Sean Paul <seanpaul@...omium.org>
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_hdcp.h>
> +#include <linux/i2c.h>
> +#include <linux/random.h>
> +
> +#include "intel_drv.h"
> +#include "i915_reg.h"
> +
> +#define KEY_LOAD_TRIES 5
> +
> +static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port,
> + const struct intel_hdcp_shim *shim)
> +{
> + int ret, read_ret;
> + bool ksv_ready;
> +
> + ret = __wait_for(read_ret = shim->read_ksv_ready(intel_dig_port,
> + &ksv_ready),
> + read_ret || ksv_ready, 1500 * 1000, 1000, 100 * 1000);
> + if (ret)
> + return ret;
> + if (read_ret)
> + return read_ret;
> + if (!ksv_ready)
> + return -ETIMEDOUT;
> +
> + return 0;
> +}
> +
> +static void intel_hdcp_clear_keys(struct drm_i915_private *dev_priv)
> +{
> + I915_WRITE(SKL_HDCP_KEY_CONF, SKL_HDCP_CLEAR_KEYS_TRIGGER);
> + I915_WRITE(SKL_HDCP_KEY_STATUS,
> + SKL_HDCP_KEY_LOAD_DONE | SKL_HDCP_KEY_LOAD_STATUS |
> + SKL_HDCP_FUSE_IN_PROGRESS | SKL_HDCP_FUSE_ERROR |
> + SKL_HDCP_FUSE_DONE);
> +}
> +
> +static int intel_hdcp_load_keys(struct drm_i915_private *dev_priv)
> +{
> + int ret;
> + u32 val;
> +
> + /* Initiate loading the HDCP key from fuses */
> + mutex_lock(&dev_priv->pcu_lock);
> + ret = sandybridge_pcode_write(dev_priv, SKL_PCODE_LOAD_HDCP_KEYS, 1);
> + mutex_unlock(&dev_priv->pcu_lock);
> + if (ret) {
> + DRM_ERROR("Failed to initiate HDCP key load (%d)\n", ret);
> + return ret;
> + }
> +
> + /* Wait for the keys to load (500us) */
> + ret = __intel_wait_for_register(dev_priv, SKL_HDCP_KEY_STATUS,
> + SKL_HDCP_KEY_LOAD_DONE,
> + SKL_HDCP_KEY_LOAD_DONE,
> + 10, 1, &val);
> + if (ret)
> + return ret;
> + else if (!(val & SKL_HDCP_KEY_LOAD_STATUS))
> + return -ENXIO;
> +
> + /* Send Aksv over to PCH display for use in authentication */
> + I915_WRITE(SKL_HDCP_KEY_CONF, SKL_HDCP_AKSV_SEND_TRIGGER);
> +
> + return 0;
> +}
> +
> +/* Returns updated SHA-1 index */
> +static int intel_write_sha_text(struct drm_i915_private *dev_priv, u32 sha_text)
> +{
> + I915_WRITE(SKL_HDCP_SHA_TEXT, sha_text);
> + if (intel_wait_for_register(dev_priv, SKL_HDCP_REP_CTL,
> + SKL_HDCP_SHA1_READY,
> + SKL_HDCP_SHA1_READY, 1)) {
> + DRM_ERROR("Timed out waiting for SHA1 ready\n");
> + return -ETIMEDOUT;
> + }
> + return 0;
> +}
> +
> +static
> +u32 intel_hdcp_get_repeater_ctl(struct intel_digital_port *intel_dig_port)
> +{
> + enum port port = intel_dig_port->base.port;
> + switch(port) {
> + case PORT_A:
> + return SKL_HDCP_DDIA_REP_PRESENT | SKL_HDCP_DDIA_SHA1_M0;
> + case PORT_B:
> + return SKL_HDCP_DDIB_REP_PRESENT | SKL_HDCP_DDIB_SHA1_M0;
> + case PORT_C:
> + return SKL_HDCP_DDIC_REP_PRESENT | SKL_HDCP_DDIC_SHA1_M0;
> + case PORT_D:
> + return SKL_HDCP_DDID_REP_PRESENT | SKL_HDCP_DDID_SHA1_M0;
> + case PORT_E:
> + return SKL_HDCP_DDIE_REP_PRESENT | SKL_HDCP_DDIE_SHA1_M0;
> + default:
> + break;
> + }
> + DRM_ERROR("Unknown port %d\n", port);
> + return -EINVAL;
> +}
> +
> +/* Implements Part 2 of the HDCP authorization procedure */
> +static
> +int intel_hdcp_auth_downstream(struct intel_digital_port *intel_dig_port,
> + const struct intel_hdcp_shim *shim)
> +{
> + struct drm_i915_private *dev_priv;
> + u32 vprime, sha_text, sha_leftovers, rep_ctl;
> + u8 bstatus[2], num_downstream, *ksv_fifo;
> + int ret, i, j, sha_idx;
> +
> + dev_priv = intel_dig_port->base.base.dev->dev_private;
> +
> + ret = shim->read_bstatus(intel_dig_port, bstatus);
> + if (ret)
> + return ret;
> +
> + /* If there are no downstream devices, we're all done. */
> + num_downstream = DRM_HDCP_NUM_DOWNSTREAM(bstatus[0]);
> + if (num_downstream == 0) {
> + DRM_INFO("HDCP is enabled (no downstream devices)\n");
> + return 0;
> + }
> +
> + /* Poll for ksv list ready (spec says max time allowed is 5s) */
> + ret = intel_hdcp_poll_ksv_fifo(intel_dig_port, shim);
> + if (ret) {
> + DRM_ERROR("KSV list failed to become ready (%d)\n", ret);
> + return ret;
> + }
> +
> + ksv_fifo = kzalloc(num_downstream * DRM_HDCP_KSV_LEN, GFP_KERNEL);
> + if (!ksv_fifo)
> + return -ENOMEM;
> +
> + ret = shim->read_ksv_fifo(intel_dig_port, num_downstream, ksv_fifo);
> + if (ret)
> + return ret;
> +
> + /* Process V' values from the receiver */
> + for (i = 0; i < DRM_HDCP_V_PRIME_NUM_PARTS; i++) {
> + ret = shim->read_v_prime_part(intel_dig_port, i, &vprime);
> + if (ret)
> + return ret;
> + I915_WRITE(SKL_HDCP_SHA_V_PRIME(i), vprime);
> + }
> +
> + /*
> + * We need to write the concatenation of all device KSVs, BINFO (DP) ||
> + * BSTATUS (HDMI), and M0 (which is added via HDCP_REP_CTL). This byte
> + * stream is written via the HDCP_SHA_TEXT register in 32-bit
> + * increments. Every 64 bytes, we need to write HDCP_REP_CTL again. This
> + * index will keep track of our progress through the 64 bytes as well as
> + * helping us work the 40-bit KSVs through our 32-bit register.
> + *
> + * NOTE: data passed via HDCP_SHA_TEXT should be big-endian
> + */
> + sha_idx = 0;
> + sha_text = 0;
> + sha_leftovers = 0;
> + rep_ctl = intel_hdcp_get_repeater_ctl(intel_dig_port);
> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_32);
> + for (i = 0; i < num_downstream; i++) {
> + unsigned sha_empty;
> + u8 *ksv = &ksv_fifo[i * DRM_HDCP_KSV_LEN];
> +
> + /* Fill up the empty slots in sha_text and write it out */
> + sha_empty = sizeof(sha_text) - sha_leftovers;
> + for (j = 0; j < sha_empty; j++)
> + sha_text |= ksv[j] << ((sizeof(sha_text) - j - 1) * 8);
> +
> + ret = intel_write_sha_text(dev_priv, sha_text);
> + if (ret < 0)
> + return ret;
> +
> + /* Programming guide writes this every 64 bytes */
> + sha_idx += sizeof(sha_text);
> + if (!(sha_idx % 64))
> + I915_WRITE(SKL_HDCP_REP_CTL,
> + rep_ctl | SKL_HDCP_SHA1_TEXT_32);
> +
> + /* Store the leftover bytes from the ksv in sha_text */
> + sha_leftovers = DRM_HDCP_KSV_LEN - sha_empty;
> + sha_text = 0;
> + for (j = 0; j < sha_leftovers; j++)
> + sha_text |= ksv[sha_empty + j] <<
> + ((sizeof(sha_text) - j - 1) * 8);
> +
> + /*
> + * If we still have room in sha_text for more data, continue.
> + * Otherwise, write it out immediately.
> + */
> + if (sizeof(sha_text) > sha_leftovers)
> + continue;
> +
> + ret = intel_write_sha_text(dev_priv, sha_text);
> + if (ret < 0)
> + return ret;
> + sha_leftovers = 0;
> + sha_text = 0;
> + sha_idx += sizeof(sha_text);
> + }
> +
> + /*
> + * We need to write BINFO/BSTATUS, and M0 now. Depending on how many
> + * bytes are leftover from the last ksv, we might be able to fit them
> + * all in sha_text (first 2 cases), or we might need to split them up
> + * into 2 writes (last 2 cases).
> + */
> + if (sha_leftovers == 0) {
> + /* Write 16 bits of text, 16 bits of M0 */
> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_16);
> + ret = intel_write_sha_text(dev_priv,
> + bstatus[0] << 8 | bstatus[1]);
> + if (ret < 0)
> + return ret;
> + sha_idx += sizeof(sha_text);
> +
> + /* Write 32 bits of M0 */
> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_0);
> + ret = intel_write_sha_text(dev_priv, 0);
> + if (ret < 0)
> + return ret;
> + sha_idx += sizeof(sha_text);
> +
> + /* Write 16 bits of M0 */
> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_16);
> + ret = intel_write_sha_text(dev_priv, 0);
> + if (ret < 0)
> + return ret;
> + sha_idx += sizeof(sha_text);
> +
> + } else if (sha_leftovers == 1) {
> + /* Write 24 bits of text, 8 bits of M0 */
> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_24);
> + sha_text |= bstatus[0] << 16 | bstatus[1] << 8;
> + /* Only 24-bits of data, must be in the LSB */
> + sha_text = (sha_text & 0xffffff00) >> 8;
> + ret = intel_write_sha_text(dev_priv, sha_text);
> + if (ret < 0)
> + return ret;
> + sha_idx += sizeof(sha_text);
> +
> + /* Write 32 bits of M0 */
> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_0);
> + ret = intel_write_sha_text(dev_priv, 0);
> + if (ret < 0)
> + return ret;
> + sha_idx += sizeof(sha_text);
> +
> + /* Write 24 bits of M0 */
> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_8);
> + ret = intel_write_sha_text(dev_priv, 0);
> + if (ret < 0)
> + return ret;
> + sha_idx += sizeof(sha_text);
> +
> + } else if (sha_leftovers == 2) {
> + /* Write 32 bits of text */
> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_32);
> + sha_text |= bstatus[0] << 24 | bstatus[1] << 16;
> + ret = intel_write_sha_text(dev_priv, sha_text);
> + if (ret < 0)
> + return ret;
> + sha_idx += sizeof(sha_text);
> +
> + /* Write 64 bits of M0 */
> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_0);
> + for (i = 0; i < 2; i++) {
> + ret = intel_write_sha_text(dev_priv, 0);
> + if (ret < 0)
> + return ret;
> + sha_idx += sizeof(sha_text);
> + }
> + } else if (sha_leftovers == 3) {
> + /* Write 32 bits of text */
> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_32);
> + sha_text |= bstatus[0] << 24;
> + ret = intel_write_sha_text(dev_priv, sha_text);
> + if (ret < 0)
> + return ret;
> + sha_idx += sizeof(sha_text);
> +
> + /* Write 8 bits of text, 24 bits of M0 */
> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_8);
> + ret = intel_write_sha_text(dev_priv, bstatus[1]);
> + if (ret < 0)
> + return ret;
> + sha_idx += sizeof(sha_text);
> +
> + /* Write 32 bits of M0 */
> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_0);
> + ret = intel_write_sha_text(dev_priv, 0);
> + if (ret < 0)
> + return ret;
> + sha_idx += sizeof(sha_text);
> +
> + /* Write 8 bits of M0 */
> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_24);
> + ret = intel_write_sha_text(dev_priv, 0);
> + if (ret < 0)
> + return ret;
> + sha_idx += sizeof(sha_text);
> + } else {
> + DRM_ERROR("Invalid number of leftovers %d\n", sha_leftovers);
> + return -EINVAL;
> + }
> +
> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_32);
> + /* Fill up to 64-4 bytes with zeros (leave the last write for length) */
> + while ((sha_idx % 64) < (64 - sizeof(sha_text))) {
> + ret = intel_write_sha_text(dev_priv, 0);
> + if (ret < 0)
> + return ret;
> + sha_idx += sizeof(sha_text);
> + }
> +
> + /*
> + * Last write gets the length of the concatenation in bits. That is:
> + * - 5 bytes per device
> + * - 10 bytes for BINFO/BSTATUS(2), M0(8)
> + */
> + sha_text = (num_downstream * 5 + 10) * 8;
> + ret = intel_write_sha_text(dev_priv, sha_text);
> + if (ret < 0)
> + return ret;
> +
> + /* Tell the HW we're done with the hash and wait for it to ACK */
> + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_COMPLETE_HASH);
> + if (intel_wait_for_register(dev_priv, SKL_HDCP_REP_CTL,
> + SKL_HDCP_SHA1_COMPLETE,
> + SKL_HDCP_SHA1_COMPLETE, 1)) {
> + DRM_ERROR("Timed out waiting for SHA1 complete\n");
> + return -ETIMEDOUT;
> + }
> + if (!(I915_READ(SKL_HDCP_REP_CTL) & SKL_HDCP_SHA1_V_MATCH)) {
> + DRM_ERROR("SHA-1 mismatch, HDCP failed\n");
> + return -ENXIO;
> + }
> +
> + DRM_INFO("HDCP is enabled (%d downstream devices)\n", num_downstream);
> + return 0;
> +}
> +
> +/* Implements Part 1 of the HDCP authorization procedure */
> +static int intel_hdcp_auth(struct intel_digital_port *intel_dig_port,
> + const struct intel_hdcp_shim *shim)
> +{
> + struct drm_i915_private *dev_priv;
> + enum port port;
> + unsigned long r0_prime_gen_start;
> + int ret, i;
> + union {
> + u32 reg[2];
> + u8 shim[DRM_HDCP_AN_LEN];
> + } an;
> + union {
> + u32 reg[2];
> + u8 shim[DRM_HDCP_KSV_LEN];
> + } bksv;
> + union {
> + u32 reg;
> + u8 shim[DRM_HDCP_RI_LEN];
> + } ri;
> + bool repeater_present;
> +
> + dev_priv = intel_dig_port->base.base.dev->dev_private;
> +
> + port = intel_dig_port->base.port;
> +
> + /* Initialize An with 2 random values and acquire it */
> + for (i = 0; i < 2; i++)
> + I915_WRITE(SKL_PORT_HDCP_ANINIT(port), get_random_long());
> + I915_WRITE(SKL_PORT_HDCP_CONF(port), SKL_HDCP_CONF_CAPTURE_AN);
> +
> + /* Wait for An to be acquired */
> + if (intel_wait_for_register(dev_priv, SKL_PORT_HDCP_STATUS(port),
> + SKL_HDCP_STATUS_AN_READY,
> + SKL_HDCP_STATUS_AN_READY, 1)) {
> + DRM_ERROR("Timed out waiting for An\n");
> + return -ETIMEDOUT;
> + }
> +
> + an.reg[0] = I915_READ(SKL_PORT_HDCP_ANLO(port));
> + an.reg[1] = I915_READ(SKL_PORT_HDCP_ANHI(port));
> + ret = shim->write_an_aksv(intel_dig_port, an.shim);
> + if (ret)
> + return ret;
> +
> + r0_prime_gen_start = jiffies;
> +
> + memset(&bksv, 0, sizeof(bksv));
> + ret = shim->read_bksv(intel_dig_port, bksv.shim);
> + if (ret)
> + return ret;
> +
> + I915_WRITE(SKL_PORT_HDCP_BKSVLO(port), bksv.reg[0]);
> + I915_WRITE(SKL_PORT_HDCP_BKSVHI(port), bksv.reg[1]);
> +
> + ret = shim->repeater_present(intel_dig_port, &repeater_present);
> + if (ret)
> + return ret;
> + if (repeater_present)
> + I915_WRITE(SKL_HDCP_REP_CTL,
> + intel_hdcp_get_repeater_ctl(intel_dig_port));
> +
> + ret = shim->toggle_signalling(intel_dig_port, true);
> + if (ret)
> + return ret;
> +
> + I915_WRITE(SKL_PORT_HDCP_CONF(port), SKL_HDCP_CONF_AUTH_AND_ENC);
> +
> + /* Wait for R0 ready */
> + if (wait_for(I915_READ(SKL_PORT_HDCP_STATUS(port)) &
> + (SKL_HDCP_STATUS_R0_READY | SKL_HDCP_STATUS_ENC), 1)) {
> + DRM_ERROR("Timed out waiting for R0 ready\n");
> + return -ETIMEDOUT;
> + }
> +
> + /*
> + * Wait for R0' to become available, the spec says 100ms from Aksv
> + * write. On DP, there's an R0_READY bit available but no such bit
> + * exists on HDMI. Since the upper-bound is the same, we'll just do
> + * the stupid thing instead of polling on one and not the other.
> + */
> + wait_remaining_ms_from_jiffies(r0_prime_gen_start, 100);
> +
> + ri.reg = 0;
> + ret = shim->read_ri_prime(intel_dig_port, ri.shim);
> + if (ret)
> + return ret;
> + I915_WRITE(SKL_PORT_HDCP_RPRIME(port), ri.reg);
> +
> + /* Wait for Ri prime match */
> + if (wait_for(I915_READ(SKL_PORT_HDCP_STATUS(port)) &
> + (SKL_HDCP_STATUS_RI_MATCH | SKL_HDCP_STATUS_ENC), 1)) {
> + DRM_ERROR("Timed out waiting for Ri prime match (%x)\n",
> + I915_READ(SKL_PORT_HDCP_STATUS(port)));
> + return -ETIMEDOUT;
> + }
> +
> + /* Wait for encryption confirmation */
> + if (intel_wait_for_register(dev_priv, SKL_PORT_HDCP_STATUS(port),
> + SKL_HDCP_STATUS_ENC,
> + SKL_HDCP_STATUS_ENC, 20)) {
> + DRM_ERROR("Timed out waiting for encryption\n");
> + return -ETIMEDOUT;
> + }
> +
> + /*
> + * XXX: If we have MST-connected devices, we need to enable encryption
> + * on those as well.
> + */
> +
> + return intel_hdcp_auth_downstream(intel_dig_port, shim);
> +}
> +
> +static
> +struct intel_digital_port *conn_to_dig_port(struct intel_connector *connector)
> +{
> + return enc_to_dig_port(&intel_attached_encoder(&connector->base)->base);
> +}
> +
> +static int _intel_hdcp_disable(struct intel_connector *connector)
> +{
> + struct drm_i915_private *dev_priv = connector->base.dev->dev_private;
> + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
> + enum port port = intel_dig_port->base.port;
> + int ret;
> +
> + I915_WRITE(SKL_PORT_HDCP_CONF(port), 0);
> + if (intel_wait_for_register(dev_priv, SKL_PORT_HDCP_STATUS(port), ~0, 0,
> + 20)) {
> + DRM_ERROR("Failed to disable HDCP, timeout clearing status\n");
> + return -ETIMEDOUT;
> + }
> +
> + intel_hdcp_clear_keys(dev_priv);
> +
> + ret = connector->hdcp_shim->toggle_signalling(intel_dig_port, false);
> + if (ret) {
> + DRM_ERROR("Failed to disable HDCP signalling\n");
> + return ret;
> + }
> +
> + DRM_INFO("HDCP is disabled\n");
> + return 0;
> +}
> +
> +static int _intel_hdcp_enable(struct intel_connector *connector)
> +{
> + struct drm_i915_private *dev_priv = connector->base.dev->dev_private;
> + int i, ret;
> +
> + if (!(I915_READ(SKL_FUSE_STATUS) & SKL_FUSE_PG_DIST_STATUS(1))) {
> + DRM_ERROR("PG1 is disabled, cannot load keys\n");
> + return -ENXIO;
> + }
> +
> + for (i = 0; i < KEY_LOAD_TRIES; i++) {
> + ret = intel_hdcp_load_keys(dev_priv);
> + if (!ret)
> + break;
> + intel_hdcp_clear_keys(dev_priv);
> + }
> + if (ret) {
> + DRM_ERROR("Could not load HDCP keys, (%d)\n", ret);
> + return ret;
> + }
> +
> + ret = intel_hdcp_auth(conn_to_dig_port(connector),
> + connector->hdcp_shim);
> + if (ret) {
> + DRM_ERROR("Failed to authenticate HDCP (%d)\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +void intel_hdcp_check_work(struct work_struct *work)
> +{
> + struct intel_connector *connector = container_of(to_delayed_work(work),
> + struct intel_connector,
> + hdcp_check_work);
> + if (!intel_hdcp_check_link(connector))
> + schedule_delayed_work(&connector->hdcp_check_work,
> + DRM_HDCP_CHECK_PERIOD_MS);
> +}
> +
> +void intel_hdcp_prop_work(struct work_struct *work)
> +{
> + struct intel_connector *connector = container_of(work,
> + struct intel_connector,
> + hdcp_prop_work);
> + struct drm_device *dev = connector->base.dev;
> + struct drm_connector_state *state;
> +
> + mutex_lock(&dev->mode_config.mutex);
> + drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
> + mutex_lock(&connector->hdcp_mutex);
> +
> + /*
> + * This worker is only used to flip between ENABLED/DESIRED. Either of
> + * those to OFF is handled by core. If hdcp_value == OFF, we're running
> + * just after hdcp has been disabled, so just exit
> + */
> + if (connector->hdcp_value != DRM_MODE_CONTENT_PROTECTION_OFF) {
> + state = connector->base.state;
> + state->content_protection = connector->hdcp_value;
> + }
> +
> + mutex_unlock(&connector->hdcp_mutex);
> + drm_modeset_unlock(&dev->mode_config.connection_mutex);
> + mutex_unlock(&dev->mode_config.mutex);
> +}
> +
> +static int intel_hdcp_enable(struct intel_connector *connector)
> +{
> + int ret;
> +
> + if (!connector->hdcp_shim)
> + return -ENOENT;
> +
> + mutex_lock(&connector->hdcp_mutex);
> +
> + ret = _intel_hdcp_enable(connector);
> + if (ret)
> + goto out;
> +
> + connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_ENABLED;
> + schedule_work(&connector->hdcp_prop_work);
> + schedule_delayed_work(&connector->hdcp_check_work,
> + DRM_HDCP_CHECK_PERIOD_MS);
> +out:
> + mutex_unlock(&connector->hdcp_mutex);
> + return ret;
> +}
> +
> +static int intel_hdcp_disable(struct intel_connector *connector)
> +{
> + int ret;
> +
> + if (!connector->hdcp_shim)
> + return -ENOENT;
> +
> + mutex_lock(&connector->hdcp_mutex);
> +
> + connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_OFF;
> + ret = _intel_hdcp_disable(connector);
> +
> + mutex_unlock(&connector->hdcp_mutex);
> + cancel_delayed_work_sync(&connector->hdcp_check_work);
> + return ret;
> +}
> +
> +void intel_hdcp_atomic_check(struct drm_connector *connector,
> + struct drm_connector_state *old_state,
> + struct drm_connector_state *new_state)
> +{
> + uint64_t old_cp = old_state->content_protection;
> + uint64_t new_cp = new_state->content_protection;
> +
> + if (!new_state->crtc) {
> + /*
> + * If the connector is being disabled with CP enabled, mark it
> + * desired so it's re-enabled when the connector is brought back
> + */
> + if (old_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)
> + new_state->content_protection =
> + DRM_MODE_CONTENT_PROTECTION_DESIRED;
> + return;
> + }
> +
> + /* Only drivers can set content protection enabled */
> + if (old_cp != DRM_MODE_CONTENT_PROTECTION_ENABLED &&
> + new_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)
> + new_state->content_protection =
> + DRM_MODE_CONTENT_PROTECTION_DESIRED;
As drm_atomic_connector_set_property is rejecting the userspace request
for DRM_MODE_CONTENT_PROTECTION_ENABLED,
We dont need this check here.
--Ram
> +}
> +
> +void intel_hdcp_atomic_pre_commit(struct drm_connector *connector,
> + struct drm_connector_state *old_state,
> + struct drm_connector_state *new_state)
> +{
> + uint64_t old_cp = old_state->content_protection;
> + uint64_t new_cp = new_state->content_protection;
> +
> + /*
> + * Disable HDCP if the connector is becoming disabled, or if requested
> + * via the property.
> + */
> + if ((!new_state->crtc && old_cp != DRM_MODE_CONTENT_PROTECTION_OFF) ||
> + (new_state->crtc && old_cp != DRM_MODE_CONTENT_PROTECTION_OFF &&
> + new_cp == DRM_MODE_CONTENT_PROTECTION_OFF))
> + intel_hdcp_disable(to_intel_connector(connector));
> +}
> +
> +void intel_hdcp_atomic_commit(struct drm_connector *connector,
> + struct drm_connector_state *new_state)
> +{
> + uint64_t new_cp = new_state->content_protection;
> +
> + /* Enable hdcp if it's desired */
> + if (new_state->crtc && new_cp == DRM_MODE_CONTENT_PROTECTION_DESIRED)
> + intel_hdcp_enable(to_intel_connector(connector));
> +}
> +
> +/* Implements Part 3 of the HDCP authorization procedure */
> +int intel_hdcp_check_link(struct intel_connector *connector)
> +{
> + struct drm_i915_private *dev_priv = connector->base.dev->dev_private;
> + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector);
> + enum port port = intel_dig_port->base.port;
> + int ret = 0;
> +
> + if (!connector->hdcp_shim)
> + return -ENOENT;
> +
> + mutex_lock(&connector->hdcp_mutex);
> +
> + if (connector->hdcp_value == DRM_MODE_CONTENT_PROTECTION_OFF)
> + goto out;
> +
> + if (!(I915_READ(SKL_PORT_HDCP_STATUS(port)) & SKL_HDCP_STATUS_ENC)) {
> + DRM_ERROR("HDCP check failed: link is not encrypted, %x\n",
> + I915_READ(SKL_PORT_HDCP_STATUS(port)));
> + ret = -ENXIO;
> + connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
> + schedule_work(&connector->hdcp_prop_work);
> + goto out;
> + }
> +
> + if (connector->hdcp_shim->check_link(intel_dig_port)) {
> + if (connector->hdcp_value != DRM_MODE_CONTENT_PROTECTION_OFF) {
> + connector->hdcp_value =
> + DRM_MODE_CONTENT_PROTECTION_ENABLED;
> + schedule_work(&connector->hdcp_prop_work);
> + }
> + goto out;
> + }
> +
> + DRM_INFO("HDCP link failed, retrying authentication\n");
> +
> + ret = _intel_hdcp_disable(connector);
> + if (ret) {
> + DRM_ERROR("Failed to disable hdcp (%d)\n", ret);
> + connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
> + schedule_work(&connector->hdcp_prop_work);
> + goto out;
> + }
> +
> + ret = _intel_hdcp_enable(connector);
> + if (ret) {
> + DRM_ERROR("Failed to enable hdcp (%d)\n", ret);
> + connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
> + schedule_work(&connector->hdcp_prop_work);
> + goto out;
> + }
> +
> +out:
> + mutex_unlock(&connector->hdcp_mutex);
> + return ret;
> +}
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