[PATCH v3 06/16] drm/i915/hdcp: HDCP stream encryption support
Anshuman Gupta
anshuman.gupta at intel.com
Tue Oct 27 07:46:11 UTC 2020
On 2020-10-27 at 11:50:13 +0530, Shankar, Uma wrote:
>
>
> > -----Original Message-----
> > From: Anshuman Gupta <anshuman.gupta at intel.com>
> > Sent: Friday, October 23, 2020 5:51 PM
> > To: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org
> > Cc: seanpaul at chromium.org; Nikula, Jani <jani.nikula at intel.com>; C,
> > Ramalingam <ramalingam.c at intel.com>; Li, Juston <juston.li at intel.com>;
> > Shankar, Uma <uma.shankar at intel.com>; Gupta, Anshuman
> > <anshuman.gupta at intel.com>
> > Subject: [PATCH v3 06/16] drm/i915/hdcp: HDCP stream encryption support
> >
> > 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.
> > 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 bf8730267cfd..fbeffdfd1a0d 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..652d4645f255 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_select_hdcp_stream(struct intel_digital_port *dig_port,
> > + bool enable)
>
> I feel ....toggle_hdcp_stream_select will look better.
>
> > {
> > 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 */
>
> Should we not keep this delay.
Thanks for comment.
As per B.Spec:49289 this delay only requires for HDMI/DVI panel while toggling HDCP signalling.
I will fix other comments on this patch.
Thanks,
Anshuman.
>
> > - 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 Multistream HDCP select failed
>
> This print doesn't sound good, refine it.
>
> > (%d)\n",
> > + enable ? "Enable" : "Disable", ret);
> > return ret;
> > }
> >
> > +static int
> > +intel_dp_mst_hdcp_strem_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_select_hdcp_stream(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_strem_encryption,
>
> Typo in stream.
>
> > .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
> > d4952c9875fb..86a9a5145e47 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -9970,6 +9970,7 @@ 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
>
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