Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752860AbdLEJKV (ORCPT ); Tue, 5 Dec 2017 04:10:21 -0500 Received: from mga11.intel.com ([192.55.52.93]:1498 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752635AbdLEJKN (ORCPT ); Tue, 5 Dec 2017 04:10:13 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.45,363,1508828400"; d="scan'208";a="183778017" Subject: Re: [PATCH v3 5/9] drm/i915: Add HDCP framework + base implementation To: Sean Paul , dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org, daniel.vetter@intel.com, seanpaul@google.com, Chris Wilson , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , David Airlie References: <20171205051513.8603-1-seanpaul@chromium.org> <20171205051513.8603-6-seanpaul@chromium.org> From: Ramalingam C Message-ID: Date: Tue, 5 Dec 2017 14:36:39 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 In-Reply-To: <20171205051513.8603-6-seanpaul@chromium.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 37999 Lines: 1063 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 > Cc: Daniel Vetter > Cc: Ramalingam C > Signed-off-by: Sean Paul > --- > 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 > + */ > + > +#include > +#include > +#include > +#include > + > +#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; > +}