Hello Suraj,
> -----Original Message-----
> From: Kandpal, Suraj <suraj.kandpal@xxxxxxxxx>
> Sent: Wednesday, April 17, 2024 3:26 PM
> To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: Borah, Chaitanya Kumar <chaitanya.kumar.borah@xxxxxxxxx>; Shankar,
> Uma <uma.shankar@xxxxxxxxx>; Nautiyal, Ankit K
> <ankit.k.nautiyal@xxxxxxxxx>; Nikula, Jani <jani.nikula@xxxxxxxxx>; Kandpal,
> Suraj <suraj.kandpal@xxxxxxxxx>
> Subject: [PATCH] drm/i915/hdcp: Disable HDCP Line Rekeying for HDCP2.2 on
> HDMI
>
> Disable HDCP Line Rekeying when HDCP ver > 1.4 and when we are on HDMI
> TMDS operation for DISPLAY_VER >= 14.
>
> --v2
> -Wa to be mentioned in comments not in commit message [Jani] -Remove
> blankline [Jani]
>
> --v3
> -No need to write what is being done in comments when code is self
> explanatory [Jani]
>
> Bspec: 49273
> Bspec: 69964
> Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_hdcp.c | 17 +++++++++++++++++
> drivers/gpu/drm/i915/i915_reg.h | 1 +
> 2 files changed, 18 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c
> b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index d5ed4c7dfbc0..78b20f23a2e1 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -30,6 +30,21 @@
> #define KEY_LOAD_TRIES 5
> #define HDCP2_LC_RETRY_CNT 3
>
> +/* WA: 16022217614 */
> +static void
> +intel_hdcp_disable_hdcp_line_rekeying(struct intel_encoder *encoder,
> + struct intel_hdcp *hdcp)
> +{
> + struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> +
> + if (encoder->type != INTEL_OUTPUT_HDMI)
> + return;
(Nit) Though we can't do much here for non-TMDS HDMI, we can keep a comment so that if such support is added in future, there is a hint to make the change.
> +
> + if (DISPLAY_VER(dev_priv) >= 14)
> + intel_de_rmw(dev_priv, TRANS_DDI_FUNC_CTL(hdcp-
> >cpu_transcoder),
This register seems to differ for MTL and BMG. Kindly re-check.
Regards
Chaitanya
> + TRANS_DDI_HDCP_LINE_REKEY_DISABLE, 1); }
> +
> static int intel_conn_to_vcpi(struct intel_atomic_state *state,
> struct intel_connector *connector) { @@ -2005,6
> +2020,8 @@ static int _intel_hdcp2_enable(struct intel_atomic_state *state,
> connector->base.base.id, connector->base.name,
> hdcp->content_type);
>
> + intel_hdcp_disable_hdcp_line_rekeying(connector->encoder, hdcp);
> +
> ret = hdcp2_authenticate_and_encrypt(state, connector);
> if (ret) {
> drm_dbg_kms(&i915->drm, "HDCP2 Type%d Enabling Failed.
> (%d)\n", diff --git a/drivers/gpu/drm/i915/i915_reg.h
> b/drivers/gpu/drm/i915/i915_reg.h index 3f34efcd7d6c..fbf4623cd536 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5630,6 +5630,7 @@ enum skl_power_gate {
> #define TRANS_DDI_EDP_INPUT_B_ONOFF (5 << 12)
> #define TRANS_DDI_EDP_INPUT_C_ONOFF (6 << 12)
> #define TRANS_DDI_EDP_INPUT_D_ONOFF (7 << 12)
> +#define TRANS_DDI_HDCP_LINE_REKEY_DISABLE REG_BIT(12)
> #define TRANS_DDI_MST_TRANSPORT_SELECT_MASK REG_GENMASK(11,
> 10)
> #define TRANS_DDI_MST_TRANSPORT_SELECT(trans) \
> REG_FIELD_PREP(TRANS_DDI_MST_TRANSPORT_SELECT_MASK,
> trans)
> --
> 2.43.2
