Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751498AbdLAHfz (ORCPT ); Fri, 1 Dec 2017 02:35:55 -0500 Received: from mga06.intel.com ([134.134.136.31]:1606 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750940AbdLAHfN (ORCPT ); Fri, 1 Dec 2017 02:35:13 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.45,344,1508828400"; d="scan'208";a="9228122" Subject: Re: [RFC PATCH 5/6] drm/i915: Implement HDCP for HDMI To: Sean Paul , dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Cc: David Airlie , Joonas Lahtinen , linux-kernel@vger.kernel.org, Rodrigo Vivi References: <20171130030907.26848-1-seanpaul@chromium.org> <20171130030907.26848-6-seanpaul@chromium.org> From: Ramalingam C Message-ID: <707c6055-2f28-3892-c62f-dd2b5161632d@intel.com> Date: Fri, 1 Dec 2017 13:01:44 +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: <20171130030907.26848-6-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: 11559 Lines: 373 Sean, We might want to check the panel's HDCP capability? Agreed that majority of HDMI/DP panel's supports it, but there is a possibility that we might avoid authentication on non-hdcp panels. As per HDCP specification, check for valid bksv will serve the purpose. On Thursday 30 November 2017 08:39 AM, Sean Paul wrote: > This patch adds HDCP support for HDMI connectors by implementing > the intel_hdcp_shim. > > Nothing too special, just a bunch of DDC reads/writes. > > Signed-off-by: Sean Paul > --- > drivers/gpu/drm/i915/i915_reg.h | 1 + > drivers/gpu/drm/i915/intel_ddi.c | 50 ++++++++ > drivers/gpu/drm/i915/intel_hdmi.c | 253 ++++++++++++++++++++++++++++++++++++++ > 3 files changed, 304 insertions(+) > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h > index 78370877fea3..061c52a5d7d7 100644 > --- a/drivers/gpu/drm/i915/i915_reg.h > +++ b/drivers/gpu/drm/i915/i915_reg.h > @@ -8400,6 +8400,7 @@ enum skl_power_gate { > #define TRANS_DDI_EDP_INPUT_A_ONOFF (4<<12) > #define TRANS_DDI_EDP_INPUT_B_ONOFF (5<<12) > #define TRANS_DDI_EDP_INPUT_C_ONOFF (6<<12) > +#define TRANS_DDI_HDCP_SIGNALLING (1<<9) > #define TRANS_DDI_DP_VC_PAYLOAD_ALLOC (1<<8) > #define TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE (1<<7) > #define TRANS_DDI_HDMI_SCRAMBLER_RESET_FREQ (1<<6) > diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c > index 0e69337f410d..0324b09ecf76 100644 > --- a/drivers/gpu/drm/i915/intel_ddi.c > +++ b/drivers/gpu/drm/i915/intel_ddi.c > @@ -1650,6 +1650,56 @@ void intel_ddi_disable_transcoder_func(struct drm_i915_private *dev_priv, > I915_WRITE(reg, val); > } > > +int intel_ddi_disable_hdcp_signalling(struct intel_encoder *intel_encoder) > +{ > + struct drm_device *dev = intel_encoder->base.dev; > + struct drm_i915_private *dev_priv = to_i915(dev); > + enum pipe pipe = 0; > + int ret = 0; > + uint32_t tmp; > + > + if (!intel_display_power_get_if_enabled(dev_priv, > + intel_encoder->power_domain)) > + return -ENXIO; > + > + if (!intel_encoder->get_hw_state(intel_encoder, &pipe)) { > + ret = -EIO; > + goto out; > + } > + > + tmp = I915_READ(TRANS_DDI_FUNC_CTL(pipe)); > + tmp &= ~TRANS_DDI_HDCP_SIGNALLING; > + I915_WRITE(TRANS_DDI_FUNC_CTL(pipe), tmp); > +out: > + intel_display_power_put(dev_priv, intel_encoder->power_domain); > + return ret; > +} > + > +int intel_ddi_enable_hdcp_signalling(struct intel_encoder *intel_encoder) > +{ > + struct drm_device *dev = intel_encoder->base.dev; > + struct drm_i915_private *dev_priv = to_i915(dev); > + enum pipe pipe = 0; > + int ret = 0; > + uint32_t tmp; > + > + if (!intel_display_power_get_if_enabled(dev_priv, > + intel_encoder->power_domain)) > + return -ENXIO; > + > + if (!intel_encoder->get_hw_state(intel_encoder, &pipe)) { > + ret = -EIO; > + goto out; > + } > + > + tmp = I915_READ(TRANS_DDI_FUNC_CTL(pipe)); > + tmp |= TRANS_DDI_HDCP_SIGNALLING; > + I915_WRITE(TRANS_DDI_FUNC_CTL(pipe), tmp); > +out: > + intel_display_power_put(dev_priv, intel_encoder->power_domain); > + return ret; > +} > + > bool intel_ddi_connector_get_hw_state(struct intel_connector *intel_connector) > { > struct drm_device *dev = intel_connector->base.dev; > diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c > index 59247a49a077..563168897dd9 100644 > --- a/drivers/gpu/drm/i915/intel_hdmi.c > +++ b/drivers/gpu/drm/i915/intel_hdmi.c > @@ -34,6 +34,7 @@ > #include > #include > #include > +#include > #include > #include "intel_drv.h" > #include > @@ -875,6 +876,252 @@ void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, bool enable) > adapter, enable); > } > > +static int intel_hdmi_hdcp_read(struct intel_digital_port *intel_dig_port, > + unsigned int offset, void *buffer, size_t size) > +{ > + struct intel_hdmi *hdmi = &intel_dig_port->hdmi; > + struct drm_i915_private *dev_priv = > + intel_dig_port->base.base.dev->dev_private; > + struct i2c_adapter *adapter = intel_gmbus_get_adapter(dev_priv, > + hdmi->ddc_bus); > + int ret; > + u8 start = offset & 0xff; > + struct i2c_msg msgs[] = { > + { > + .addr = DRM_HDCP_DDC_ADDR, > + .flags = 0, > + .len = 1, > + .buf = &start, > + }, > + { > + .addr = DRM_HDCP_DDC_ADDR, > + .flags = I2C_M_RD, > + .len = size, > + .buf = buffer > + } > + }; > + ret = i2c_transfer(adapter, msgs, ARRAY_SIZE(msgs)); > + if (ret == ARRAY_SIZE(msgs)) > + return 0; > + return ret >= 0 ? -EIO : ret; > +} > + > +static int intel_hdmi_hdcp_write(struct intel_digital_port *intel_dig_port, > + unsigned int offset, void *buffer, size_t size) > +{ > + struct intel_hdmi *hdmi = &intel_dig_port->hdmi; > + struct drm_i915_private *dev_priv = > + intel_dig_port->base.base.dev->dev_private; > + struct i2c_adapter *adapter = intel_gmbus_get_adapter(dev_priv, > + hdmi->ddc_bus); > + int ret; > + u8 *write_buf; > + struct i2c_msg msg; > + > + write_buf = kzalloc(size + 1, GFP_KERNEL); > + if (!write_buf) > + return -ENOMEM; > + > + write_buf[0] = offset & 0xff; > + memcpy(&write_buf[1], buffer, size); > + > + msg.addr = DRM_HDCP_DDC_ADDR; > + msg.flags = 0, > + msg.len = size + 1, > + msg.buf = write_buf; > + > + ret = i2c_transfer(adapter, &msg, 1); > + if (ret == 1) > + return 0; > + return ret >= 0 ? -EIO : ret; > +} > + > +static > +int intel_hdmi_hdcp_write_an_aksv(struct intel_digital_port *intel_dig_port, > + u8 *an) > +{ > + struct intel_hdmi *hdmi = &intel_dig_port->hdmi; > + struct drm_i915_private *dev_priv = > + intel_dig_port->base.base.dev->dev_private; > + struct i2c_adapter *adapter = intel_gmbus_get_adapter(dev_priv, > + hdmi->ddc_bus); > + int ret; > + > + ret = intel_hdmi_hdcp_write(intel_dig_port, DRM_HDCP_DDC_AN, an, > + DRM_HDCP_AN_LEN); > + if (ret) { > + DRM_ERROR("Write An over DDC failed (%d)\n", ret); > + return ret; > + } > + > + ret = intel_gmbus_output_aksv(adapter); > + if (ret < 0) { > + DRM_ERROR("Failed to output aksv (%d)\n", ret); > + return ret; > + } > + return 0; > +} > + > +static int intel_hdmi_hdcp_read_bksv(struct intel_digital_port *intel_dig_port, > + u8 *bksv) > +{ > + int ret; > + ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_BKSV, bksv, > + DRM_HDCP_KSV_LEN); > + if (ret) > + DRM_ERROR("Read Bksv over DDC failed (%d)\n", ret); > + return ret; > +} > + > +static > +int intel_hdmi_hdcp_read_bstatus(struct intel_digital_port *intel_dig_port, > + u8 *bstatus) > +{ > + int ret; > + ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_BSTATUS, > + bstatus, DRM_HDCP_BSTATUS_LEN); > + if (ret) > + DRM_ERROR("Read bstatus over DDC failed (%d)\n", ret); > + return ret; > +} > + > +static > +int intel_hdmi_hdcp_repeater_present(struct intel_digital_port *intel_dig_port, > + bool *repeater_present) > +{ > + int ret; > + u8 val; > + > + ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_BCAPS, &val, 1); > + if (ret) { > + DRM_ERROR("Read bcaps over DDC failed (%d)\n", ret); > + return ret; > + } > + *repeater_present = val & DRM_HDCP_DDC_BCAPS_REPEATER_PRESENT; > + return 0; > +} > + > +static > +int intel_hdmi_hdcp_read_ri_prime(struct intel_digital_port *intel_dig_port, > + u8 *ri_prime) > +{ > + int ret; > + ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_RI_PRIME, > + ri_prime, DRM_HDCP_RI_LEN); > + if (ret) > + DRM_ERROR("Read Ri' over DDC failed (%d)\n", ret); > + return ret; > +} > + > +static > +int intel_hdmi_hdcp_read_ksv_ready(struct intel_digital_port *intel_dig_port, > + bool *ksv_ready) > +{ > + int ret; > + u8 val; > + > + ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_BCAPS, &val, 1); > + if (ret) { > + DRM_ERROR("Read bcaps over DDC failed (%d)\n", ret); > + return ret; > + } > + *ksv_ready = val & DRM_HDCP_DDC_BCAPS_KSV_FIFO_READY; > + return 0; > +} > + > +static > +int intel_hdmi_hdcp_read_ksv_fifo(struct intel_digital_port *intel_dig_port, > + int num_downstream, u8 *ksv_fifo) > +{ > + int ret; > + ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_KSV_FIFO, > + ksv_fifo, num_downstream * DRM_HDCP_KSV_LEN); > + if (ret) { > + DRM_ERROR("Read ksv fifo over DDC failed (%d)\n", ret); > + return ret; > + } > + return 0; > +} > + > +static > +int intel_hdmi_hdcp_read_v_prime_part(struct intel_digital_port *intel_dig_port, > + int i, u32 *part) > +{ > + int ret; > + > + if (i >= DRM_HDCP_V_PRIME_NUM_PARTS) > + return -EINVAL; > + > + ret = intel_hdmi_hdcp_read(intel_dig_port, DRM_HDCP_DDC_V_PRIME(i), > + part, DRM_HDCP_V_PRIME_PART_LEN); > + if (ret) > + DRM_ERROR("Read V'[%d] over DDC failed (%d)\n", i, ret); > + return ret; > +} > + > +static > +int intel_hdmi_hdcp_toggle_signalling(struct intel_digital_port *intel_dig_port, > + bool enable) > +{ > + int ret; > + if (enable) { > + ret = intel_ddi_enable_hdcp_signalling(&intel_dig_port->base); > + if (ret) { > + DRM_ERROR("Enable HDCP signalling failed (%d)\n", ret); > + return ret; > + } > + } else { > + usleep_range(6, 60); /* Bspec says >= 6us */ > + ret = intel_ddi_disable_hdcp_signalling(&intel_dig_port->base); > + if (ret) { > + DRM_ERROR("Enable HDCP signalling failed (%d)\n", ret); > + return ret; > + } > + } > + return 0; > +} > + > +static > +bool intel_hdmi_hdcp_check_link(struct intel_digital_port *intel_dig_port) > +{ > + struct drm_i915_private *dev_priv = > + intel_dig_port->base.base.dev->dev_private; > + enum port port = intel_dig_port->port; > + int ret; > + union { > + u32 reg; > + u8 shim[DRM_HDCP_RI_LEN]; > + } ri; > + > + ret = intel_hdmi_hdcp_read_ri_prime(intel_dig_port, ri.shim); > + if (ret) > + return false; > + > + 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("Ri' mismatch detected, link check failed (%x)\n", > + I915_READ(SKL_PORT_HDCP_STATUS(port))); > + return false; > + } > + return true; > +} > + > +static const struct intel_hdcp_shim intel_hdmi_hdcp_shim = { > + .write_an_aksv = intel_hdmi_hdcp_write_an_aksv, > + .read_bksv = intel_hdmi_hdcp_read_bksv, > + .read_bstatus = intel_hdmi_hdcp_read_bstatus, > + .repeater_present = intel_hdmi_hdcp_repeater_present, > + .read_ri_prime = intel_hdmi_hdcp_read_ri_prime, > + .read_ksv_ready = intel_hdmi_hdcp_read_ksv_ready, > + .read_ksv_fifo = intel_hdmi_hdcp_read_ksv_fifo, > + .read_v_prime_part = intel_hdmi_hdcp_read_v_prime_part, > + .toggle_signalling = intel_hdmi_hdcp_toggle_signalling, > + .check_link = intel_hdmi_hdcp_check_link, > +}; > + > static void intel_hdmi_prepare(struct intel_encoder *encoder, > const struct intel_crtc_state *crtc_state) > { > @@ -2039,6 +2286,12 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port, > > intel_hdmi_add_properties(intel_hdmi, connector); > > + if (INTEL_GEN(dev_priv) >= 9) { > + drm_connector_attach_content_protection_property(connector); > + intel_connector->hdcp_shim = &intel_hdmi_hdcp_shim; > + INIT_DELAYED_WORK(&intel_connector->hdcp_work, intel_hdcp_work); > + } > + > intel_connector_attach_encoder(intel_connector, intel_encoder); > intel_hdmi->attached_connector = intel_connector; >