[Intel-gfx] [PATCH v4 06/16] drm/i915/hdcp: HDCP stream encryption support
Ramalingam C
ramalingam.c at intel.com
Fri Nov 6 07:52:07 UTC 2020
On 2020-11-06 at 10:52:03 +0530, Anshuman Gupta wrote:
> On 2020-11-05 at 21:04:03 +0530, Ramalingam C wrote:
> > On 2020-10-27 at 22:11:58 +0530, Anshuman Gupta wrote:
> > > Both HDCP_{1.x,2.x} requires to select/deselect Multistream HDCP bit
> > > in TRANS_DDI_FUNC_CTL in order to enable/disable stream HDCP
> > > encryption over DP MST Transport Link.
> > >
> > > HDCP 1.4 stream encryption requires to validate the stream encryption
> > > status in HDCP_STATUS_{TRANSCODER,PORT} register driving that link
> > > in order to enable/disable the stream encryption.
> > >
> > > Both of above requirement are same for all Gen with respect to
> > > B.Spec Documentation.
> > >
> > > v2:
> > > Cosmetic changes function name, error msg print and
> > > stream typo fixes. [Uma]
> > >
> > > Cc: Ramalingam C <ramalingam.c at intel.com>
> > > Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
> > > ---
> > > drivers/gpu/drm/i915/display/intel_ddi.c | 10 +--
> > > drivers/gpu/drm/i915/display/intel_ddi.h | 6 +-
> > > .../drm/i915/display/intel_display_types.h | 4 +
> > > drivers/gpu/drm/i915/display/intel_dp_hdcp.c | 80 ++++++++++++++++---
> > > drivers/gpu/drm/i915/display/intel_hdmi.c | 14 ++--
> > > drivers/gpu/drm/i915/i915_reg.h | 1 +
> > > 6 files changed, 90 insertions(+), 25 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> > > index 9fce623e951e..779603a38cfc 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> > > @@ -1948,9 +1948,9 @@ void intel_ddi_disable_transcoder_func(const struct intel_crtc_state *crtc_state
> > > }
> > > }
> > >
> > > -int intel_ddi_toggle_hdcp_signalling(struct intel_encoder *intel_encoder,
> > > - enum transcoder cpu_transcoder,
> > > - bool enable)
> > > +int intel_ddi_toggle_hdcp_bits(struct intel_encoder *intel_encoder,
> > > + enum transcoder cpu_transcoder,
> > > + bool enable, u32 hdcp_mask)
> > > {
> > > struct drm_device *dev = intel_encoder->base.dev;
> > > struct drm_i915_private *dev_priv = to_i915(dev);
> > > @@ -1965,9 +1965,9 @@ int intel_ddi_toggle_hdcp_signalling(struct intel_encoder *intel_encoder,
> > >
> > > tmp = intel_de_read(dev_priv, TRANS_DDI_FUNC_CTL(cpu_transcoder));
> > > if (enable)
> > > - tmp |= TRANS_DDI_HDCP_SIGNALLING;
> > > + tmp |= hdcp_mask;
> > > else
> > > - tmp &= ~TRANS_DDI_HDCP_SIGNALLING;
> > > + tmp &= ~hdcp_mask;
> > > intel_de_write(dev_priv, TRANS_DDI_FUNC_CTL(cpu_transcoder), tmp);
> > > intel_display_power_put(dev_priv, intel_encoder->power_domain, wakeref);
> > > return ret;
> > > diff --git a/drivers/gpu/drm/i915/display/intel_ddi.h b/drivers/gpu/drm/i915/display/intel_ddi.h
> > > index dcc711cfe4fe..a4dd815c0000 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_ddi.h
> > > +++ b/drivers/gpu/drm/i915/display/intel_ddi.h
> > > @@ -50,9 +50,9 @@ u32 bxt_signal_levels(struct intel_dp *intel_dp,
> > > const struct intel_crtc_state *crtc_state);
> > > u32 ddi_signal_levels(struct intel_dp *intel_dp,
> > > const struct intel_crtc_state *crtc_state);
> > > -int intel_ddi_toggle_hdcp_signalling(struct intel_encoder *intel_encoder,
> > > - enum transcoder cpu_transcoder,
> > > - bool enable);
> > > +int intel_ddi_toggle_hdcp_bits(struct intel_encoder *intel_encoder,
> > > + enum transcoder cpu_transcoder,
> > > + bool enable, u32 hdcp_mask);
> > > void icl_sanitize_encoder_pll_mapping(struct intel_encoder *encoder);
> > >
> > > #endif /* __INTEL_DDI_H__ */
> > > diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> > > index c47124a679b6..59b8fc21e3e8 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> > > +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> > > @@ -339,6 +339,10 @@ struct intel_hdcp_shim {
> > > enum transcoder cpu_transcoder,
> > > bool enable);
> > >
> > > + /* Enable/Disable stream encryption on DP MST Transport Link */
> > > + int (*stream_encryption)(struct intel_digital_port *dig_port,
> > > + bool enable);
> > > +
> > > /* Ensures the link is still protected */
> > > bool (*check_link)(struct intel_digital_port *dig_port,
> > > struct intel_connector *connector);
> > > diff --git a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
> > > index 03424d20e9f7..6dcbfaffd2c5 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
> > > @@ -16,6 +16,30 @@
> > > #include "intel_dp.h"
> > > #include "intel_hdcp.h"
> > >
> > > +static unsigned int transcoder_to_stream_enc_status(enum transcoder cpu_transcoder)
> > > +{
> > > + u32 stream_enc_mask;
> > > +
> > > + switch (cpu_transcoder) {
> > > + case TRANSCODER_A:
> > > + stream_enc_mask = HDCP_STATUS_STREAM_A_ENC;
> > > + break;
> > > + case TRANSCODER_B:
> > > + stream_enc_mask = HDCP_STATUS_STREAM_B_ENC;
> > > + break;
> > > + case TRANSCODER_C:
> > > + stream_enc_mask = HDCP_STATUS_STREAM_C_ENC;
> > > + break;
> > > + case TRANSCODER_D:
> > > + stream_enc_mask = HDCP_STATUS_STREAM_D_ENC;
> > > + break;
> > > + default:
> > > + stream_enc_mask = 0;
> > > + }
> > > +
> > > + return stream_enc_mask;
> > > +}
> > > +
> > > static void intel_dp_hdcp_wait_for_cp_irq(struct intel_hdcp *hdcp, int timeout)
> > > {
> > > long ret;
> > > @@ -622,24 +646,57 @@ static const struct intel_hdcp_shim intel_dp_hdcp_shim = {
> > > };
> > >
> > > static int
> > > -intel_dp_mst_hdcp_toggle_signalling(struct intel_digital_port *dig_port,
> > > - enum transcoder cpu_transcoder,
> > > - bool enable)
> > > +intel_dp_mst_toggle_hdcp_stream_select(struct intel_digital_port *dig_port,
> > > + bool enable)
> > > {
> > > struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
> > > + struct intel_dp *dp = &dig_port->dp;
> > > + struct intel_hdcp *hdcp = &dp->attached_connector->hdcp;
> > > int ret;
> > >
> > > - if (!enable)
> > > - usleep_range(6, 60); /* Bspec says >= 6us */
> > Any reason why this is removed from disable path? Or i am missing the
> > movement?
> It is required for HDMI when disabling HDCP signalling, not for HDCP
> stream select.
> According to B.Spec
> "If using HDMI or DVI, wait for at least 6 microseconds after the previous step, then disable HDCP signaling in the Transcoder DDI Function Control register."
Ok.
Reviewed-by: Ramalingam C <ramalingam.c at intel.com>
> Thanks,
> Anshuman Gupta.
> >
> > -Ram
> > > -
> > > - ret = intel_ddi_toggle_hdcp_signalling(&dig_port->base,
> > > - cpu_transcoder, enable);
> > > + ret = intel_ddi_toggle_hdcp_bits(&dig_port->base,
> > > + hdcp->stream_transcoder, enable,
> > > + TRANS_DDI_HDCP_SELECT);
> > > if (ret)
> > > - drm_dbg_kms(&i915->drm, "%s HDCP signalling failed (%d)\n",
> > > - enable ? "Enable" : "Disable", ret);
> > > + drm_err(&i915->drm, "%s HDCP stream select failed (%d)\n",
> > > + enable ? "Enable" : "Disable", ret);
> > > return ret;
> > > }
> > >
> > > +static int
> > > +intel_dp_mst_hdcp_stream_encryption(struct intel_digital_port *dig_port,
> > > + bool enable)
> > > +{
> > > + struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
> > > + struct intel_dp *dp = &dig_port->dp;
> > > + struct intel_hdcp *hdcp = &dp->attached_connector->hdcp;
> > > + enum port port = dig_port->base.port;
> > > + enum transcoder cpu_transcoder = hdcp->cpu_transcoder;
> > > + u32 stream_enc_status;
> > > + int ret;
> > > +
> > > + ret = intel_dp_mst_toggle_hdcp_stream_select(dig_port, enable);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + stream_enc_status = transcoder_to_stream_enc_status(hdcp->stream_transcoder);
> > > + if (!stream_enc_status)
> > > + return -EINVAL;
> > > +
> > > + /* Wait for encryption confirmation */
> > > + if (intel_de_wait_for_register(i915,
> > > + HDCP_STATUS(i915, cpu_transcoder, port),
> > > + stream_enc_status,
> > > + enable ? stream_enc_status : 0,
> > > + HDCP_ENCRYPT_STATUS_CHANGE_TIMEOUT_MS)) {
> > > + drm_err(&i915->drm, "Timed out waiting for stream encryption %s\n",
> > > + enable ? "enabled" : "disabled");
> > > + return -ETIMEDOUT;
> > > + }
> > > +
> > > + return 0;
> > > +}
> > > +
> > > static
> > > bool intel_dp_mst_hdcp_check_link(struct intel_digital_port *dig_port,
> > > struct intel_connector *connector)
> > > @@ -673,7 +730,8 @@ static const struct intel_hdcp_shim intel_dp_mst_hdcp_shim = {
> > > .read_ksv_ready = intel_dp_hdcp_read_ksv_ready,
> > > .read_ksv_fifo = intel_dp_hdcp_read_ksv_fifo,
> > > .read_v_prime_part = intel_dp_hdcp_read_v_prime_part,
> > > - .toggle_signalling = intel_dp_mst_hdcp_toggle_signalling,
> > > + .toggle_signalling = intel_dp_hdcp_toggle_signalling,
> > > + .stream_encryption = intel_dp_mst_hdcp_stream_encryption,
> > > .check_link = intel_dp_mst_hdcp_check_link,
> > > .hdcp_capable = intel_dp_hdcp_capable,
> > >
> > > diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
> > > index f90838bc74fb..f58469226694 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_hdmi.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
> > > @@ -1495,15 +1495,16 @@ static int kbl_repositioning_enc_en_signal(struct intel_connector *connector,
> > > usleep_range(25, 50);
> > > }
> > >
> > > - ret = intel_ddi_toggle_hdcp_signalling(&dig_port->base, cpu_transcoder,
> > > - false);
> > > + ret = intel_ddi_toggle_hdcp_bits(&dig_port->base, cpu_transcoder,
> > > + false, TRANS_DDI_HDCP_SIGNALLING);
> > > if (ret) {
> > > drm_err(&dev_priv->drm,
> > > "Disable HDCP signalling failed (%d)\n", ret);
> > > return ret;
> > > }
> > > - ret = intel_ddi_toggle_hdcp_signalling(&dig_port->base, cpu_transcoder,
> > > - true);
> > > +
> > > + ret = intel_ddi_toggle_hdcp_bits(&dig_port->base, cpu_transcoder,
> > > + true, TRANS_DDI_HDCP_SIGNALLING);
> > > if (ret) {
> > > drm_err(&dev_priv->drm,
> > > "Enable HDCP signalling failed (%d)\n", ret);
> > > @@ -1526,8 +1527,9 @@ int intel_hdmi_hdcp_toggle_signalling(struct intel_digital_port *dig_port,
> > > if (!enable)
> > > usleep_range(6, 60); /* Bspec says >= 6us */
> > >
> > > - ret = intel_ddi_toggle_hdcp_signalling(&dig_port->base, cpu_transcoder,
> > > - enable);
> > > + ret = intel_ddi_toggle_hdcp_bits(&dig_port->base,
> > > + cpu_transcoder, enable,
> > > + TRANS_DDI_HDCP_SIGNALLING);
> > > if (ret) {
> > > drm_err(&dev_priv->drm, "%s HDCP signalling failed (%d)\n",
> > > enable ? "Enable" : "Disable", ret);
> > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > > index 8b021f77cb1f..77461cde6549 100644
> > > --- a/drivers/gpu/drm/i915/i915_reg.h
> > > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > > @@ -9982,6 +9982,7 @@ enum skl_power_gate {
> > > #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)
> > > +#define TRANS_DDI_HDCP_SELECT REG_BIT(5)
> > > #define TRANS_DDI_BFI_ENABLE (1 << 4)
> > > #define TRANS_DDI_HIGH_TMDS_CHAR_RATE (1 << 4)
> > > #define TRANS_DDI_HDMI_SCRAMBLING (1 << 0)
> > > --
> > > 2.26.2
> > >
More information about the Intel-gfx
mailing list