diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_hdcp.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_hdcp.c | 807 |
1 files changed, 807 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c new file mode 100644 index 000000000000..14ca5d3057a7 --- /dev/null +++ b/drivers/gpu/drm/i915/intel_hdcp.c @@ -0,0 +1,807 @@ +/* SPDX-License-Identifier: MIT */ +/* + * Copyright (C) 2017 Google, Inc. + * + * Authors: + * Sean Paul <seanpaul@chromium.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; + + /* Poll for ksv list ready (spec says max time allowed is 5s) */ + ret = __wait_for(read_ret = shim->read_ksv_ready(intel_dig_port, + &ksv_ready), + read_ret || ksv_ready, 5 * 1000 * 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(HDCP_KEY_CONF, HDCP_CLEAR_KEYS_TRIGGER); + I915_WRITE(HDCP_KEY_STATUS, HDCP_KEY_LOAD_DONE | HDCP_KEY_LOAD_STATUS | + HDCP_FUSE_IN_PROGRESS | HDCP_FUSE_ERROR | HDCP_FUSE_DONE); +} + +static int intel_hdcp_load_keys(struct drm_i915_private *dev_priv) +{ + int ret; + u32 val; + + val = I915_READ(HDCP_KEY_STATUS); + if ((val & HDCP_KEY_LOAD_DONE) && (val & HDCP_KEY_LOAD_STATUS)) + return 0; + + /* + * On HSW and BDW HW loads the HDCP1.4 Key when Display comes + * out of reset. So if Key is not already loaded, its an error state. + */ + if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) + if (!(I915_READ(HDCP_KEY_STATUS) & HDCP_KEY_LOAD_DONE)) + return -ENXIO; + + /* + * Initiate loading the HDCP key from fuses. + * + * BXT+ platforms, HDCP key needs to be loaded by SW. Only SKL and KBL + * differ in the key load trigger process from other platforms. + */ + if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) { + 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; + } + } else { + I915_WRITE(HDCP_KEY_CONF, HDCP_KEY_LOAD_TRIGGER); + } + + /* Wait for the keys to load (500us) */ + ret = __intel_wait_for_register(dev_priv, HDCP_KEY_STATUS, + HDCP_KEY_LOAD_DONE, HDCP_KEY_LOAD_DONE, + 10, 1, &val); + if (ret) + return ret; + else if (!(val & HDCP_KEY_LOAD_STATUS)) + return -ENXIO; + + /* Send Aksv over to PCH display for use in authentication */ + I915_WRITE(HDCP_KEY_CONF, 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(HDCP_SHA_TEXT, sha_text); + if (intel_wait_for_register(dev_priv, HDCP_REP_CTL, + HDCP_SHA1_READY, 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 HDCP_DDIA_REP_PRESENT | HDCP_DDIA_SHA1_M0; + case PORT_B: + return HDCP_DDIB_REP_PRESENT | HDCP_DDIB_SHA1_M0; + case PORT_C: + return HDCP_DDIC_REP_PRESENT | HDCP_DDIC_SHA1_M0; + case PORT_D: + return HDCP_DDID_REP_PRESENT | HDCP_DDID_SHA1_M0; + case PORT_E: + return HDCP_DDIE_REP_PRESENT | HDCP_DDIE_SHA1_M0; + default: + break; + } + DRM_ERROR("Unknown port %d\n", port); + return -EINVAL; +} + +static +bool intel_hdcp_is_ksv_valid(u8 *ksv) +{ + int i, ones = 0; + /* KSV has 20 1's and 20 0's */ + for (i = 0; i < DRM_HDCP_KSV_LEN; i++) + ones += hweight8(ksv[i]); + if (ones != 20) + return false; + return true; +} + +/* 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 = intel_hdcp_poll_ksv_fifo(intel_dig_port, shim); + if (ret) { + DRM_ERROR("KSV list failed to become ready (%d)\n", ret); + return ret; + } + + ret = shim->read_bstatus(intel_dig_port, bstatus); + if (ret) + return ret; + + if (DRM_HDCP_MAX_DEVICE_EXCEEDED(bstatus[0]) || + DRM_HDCP_MAX_CASCADE_EXCEEDED(bstatus[1])) { + DRM_ERROR("Max Topology Limit Exceeded\n"); + return -EPERM; + } + + /* + * When repeater reports 0 device count, HDCP1.4 spec allows disabling + * the HDCP encryption. That implies that repeater can't have its own + * display. As there is no consumption of encrypted content in the + * repeater with 0 downstream devices, we are failing the + * authentication. + */ + num_downstream = DRM_HDCP_NUM_DOWNSTREAM(bstatus[0]); + if (num_downstream == 0) + return -EINVAL; + + 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(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(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_32); + for (i = 0; i < num_downstream; i++) { + unsigned int 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(HDCP_REP_CTL, rep_ctl | 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(HDCP_REP_CTL, rep_ctl | 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(HDCP_REP_CTL, rep_ctl | 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(HDCP_REP_CTL, rep_ctl | 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(HDCP_REP_CTL, rep_ctl | 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(HDCP_REP_CTL, rep_ctl | 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(HDCP_REP_CTL, rep_ctl | 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(HDCP_REP_CTL, rep_ctl | 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(HDCP_REP_CTL, rep_ctl | 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(HDCP_REP_CTL, rep_ctl | 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(HDCP_REP_CTL, rep_ctl | 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(HDCP_REP_CTL, rep_ctl | 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(HDCP_REP_CTL, rep_ctl | 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(HDCP_REP_CTL, rep_ctl | 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(HDCP_REP_CTL, rep_ctl | HDCP_SHA1_COMPLETE_HASH); + if (intel_wait_for_register(dev_priv, HDCP_REP_CTL, + HDCP_SHA1_COMPLETE, + HDCP_SHA1_COMPLETE, 1)) { + DRM_ERROR("Timed out waiting for SHA1 complete\n"); + return -ETIMEDOUT; + } + if (!(I915_READ(HDCP_REP_CTL) & HDCP_SHA1_V_MATCH)) { + DRM_ERROR("SHA-1 mismatch, HDCP failed\n"); + return -ENXIO; + } + + DRM_DEBUG_KMS("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, tries = 2; + 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, hdcp_capable; + + dev_priv = intel_dig_port->base.base.dev->dev_private; + + port = intel_dig_port->base.port; + + /* + * Detects whether the display is HDCP capable. Although we check for + * valid Bksv below, the HDCP over DP spec requires that we check + * whether the display supports HDCP before we write An. For HDMI + * displays, this is not necessary. + */ + if (shim->hdcp_capable) { + ret = shim->hdcp_capable(intel_dig_port, &hdcp_capable); + if (ret) + return ret; + if (!hdcp_capable) { + DRM_ERROR("Panel is not HDCP capable\n"); + return -EINVAL; + } + } + + /* Initialize An with 2 random values and acquire it */ + for (i = 0; i < 2; i++) + I915_WRITE(PORT_HDCP_ANINIT(port), get_random_u32()); + I915_WRITE(PORT_HDCP_CONF(port), HDCP_CONF_CAPTURE_AN); + + /* Wait for An to be acquired */ + if (intel_wait_for_register(dev_priv, PORT_HDCP_STATUS(port), + HDCP_STATUS_AN_READY, + HDCP_STATUS_AN_READY, 1)) { + DRM_ERROR("Timed out waiting for An\n"); + return -ETIMEDOUT; + } + + an.reg[0] = I915_READ(PORT_HDCP_ANLO(port)); + an.reg[1] = I915_READ(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)); + + /* HDCP spec states that we must retry the bksv if it is invalid */ + for (i = 0; i < tries; i++) { + ret = shim->read_bksv(intel_dig_port, bksv.shim); + if (ret) + return ret; + if (intel_hdcp_is_ksv_valid(bksv.shim)) + break; + } + if (i == tries) { + DRM_ERROR("HDCP failed, Bksv is invalid\n"); + return -ENODEV; + } + + I915_WRITE(PORT_HDCP_BKSVLO(port), bksv.reg[0]); + I915_WRITE(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(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(PORT_HDCP_CONF(port), HDCP_CONF_AUTH_AND_ENC); + + /* Wait for R0 ready */ + if (wait_for(I915_READ(PORT_HDCP_STATUS(port)) & + (HDCP_STATUS_R0_READY | 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, but + * some monitors can take longer than this. We'll set the timeout at + * 300ms just to be sure. + * + * 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, 300); + + ri.reg = 0; + ret = shim->read_ri_prime(intel_dig_port, ri.shim); + if (ret) + return ret; + I915_WRITE(PORT_HDCP_RPRIME(port), ri.reg); + + /* Wait for Ri prime match */ + if (wait_for(I915_READ(PORT_HDCP_STATUS(port)) & + (HDCP_STATUS_RI_MATCH | HDCP_STATUS_ENC), 1)) { + DRM_ERROR("Timed out waiting for Ri prime match (%x)\n", + I915_READ(PORT_HDCP_STATUS(port))); + return -ETIMEDOUT; + } + + /* Wait for encryption confirmation */ + if (intel_wait_for_register(dev_priv, PORT_HDCP_STATUS(port), + HDCP_STATUS_ENC, 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. + */ + + if (repeater_present) + return intel_hdcp_auth_downstream(intel_dig_port, shim); + + DRM_DEBUG_KMS("HDCP is enabled (no repeater present)\n"); + return 0; +} + +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; + + DRM_DEBUG_KMS("[%s:%d] HDCP is being disabled...\n", + connector->base.name, connector->base.base.id); + + I915_WRITE(PORT_HDCP_CONF(port), 0); + if (intel_wait_for_register(dev_priv, PORT_HDCP_STATUS(port), ~0, 0, + 20)) { + DRM_ERROR("Failed to disable HDCP, timeout clearing status\n"); + return -ETIMEDOUT; + } + + ret = connector->hdcp_shim->toggle_signalling(intel_dig_port, false); + if (ret) { + DRM_ERROR("Failed to disable HDCP signalling\n"); + return ret; + } + + DRM_DEBUG_KMS("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, tries = 3; + + DRM_DEBUG_KMS("[%s:%d] HDCP is being enabled...\n", + connector->base.name, connector->base.base.id); + + 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; + } + + /* Incase of authentication failures, HDCP spec expects reauth. */ + for (i = 0; i < tries; i++) { + ret = intel_hdcp_auth(conn_to_dig_port(connector), + connector->hdcp_shim); + if (!ret) + return 0; + + DRM_DEBUG_KMS("HDCP Auth failure (%d)\n", ret); + + /* Ensuring HDCP encryption and signalling are stopped. */ + _intel_hdcp_disable(connector); + } + + DRM_ERROR("HDCP authentication failed (%d tries/%d)\n", tries, ret); + return ret; +} + +static 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); +} + +static 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; + + 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 UNDESIRED is handled by core. If hdcp_value == UNDESIRED, + * we're running just after hdcp has been disabled, so just exit + */ + if (connector->hdcp_value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) { + state = connector->base.state; + state->content_protection = connector->hdcp_value; + } + + mutex_unlock(&connector->hdcp_mutex); + drm_modeset_unlock(&dev->mode_config.connection_mutex); +} + +bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port) +{ + /* PORT E doesn't have HDCP, and PORT F is disabled */ + return ((INTEL_GEN(dev_priv) >= 8 || IS_HASWELL(dev_priv)) && + !IS_CHERRYVIEW(dev_priv) && port < PORT_E); +} + +int intel_hdcp_init(struct intel_connector *connector, + const struct intel_hdcp_shim *hdcp_shim) +{ + int ret; + + ret = drm_connector_attach_content_protection_property( + &connector->base); + if (ret) + return ret; + + connector->hdcp_shim = hdcp_shim; + mutex_init(&connector->hdcp_mutex); + INIT_DELAYED_WORK(&connector->hdcp_check_work, intel_hdcp_check_work); + INIT_WORK(&connector->hdcp_prop_work, intel_hdcp_prop_work); + return 0; +} + +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; +} + +int intel_hdcp_disable(struct intel_connector *connector) +{ + int ret = 0; + + if (!connector->hdcp_shim) + return -ENOENT; + + mutex_lock(&connector->hdcp_mutex); + + if (connector->hdcp_value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) { + connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_UNDESIRED; + 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; + struct drm_crtc_state *crtc_state; + + 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; + } + + /* + * Nothing to do if the state didn't change, or HDCP was activated since + * the last commit + */ + if (old_cp == new_cp || + (old_cp == DRM_MODE_CONTENT_PROTECTION_DESIRED && + new_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)) + return; + + crtc_state = drm_atomic_get_new_crtc_state(new_state->state, + new_state->crtc); + crtc_state->mode_changed = true; +} + +/* 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_UNDESIRED) + goto out; + + if (!(I915_READ(PORT_HDCP_STATUS(port)) & HDCP_STATUS_ENC)) { + DRM_ERROR("%s:%d HDCP check failed: link is not encrypted,%x\n", + connector->base.name, connector->base.base.id, + I915_READ(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_UNDESIRED) { + connector->hdcp_value = + DRM_MODE_CONTENT_PROTECTION_ENABLED; + schedule_work(&connector->hdcp_prop_work); + } + goto out; + } + + DRM_DEBUG_KMS("[%s:%d] HDCP link failed, retrying authentication\n", + connector->base.name, connector->base.base.id); + + 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; +} |