> -----Original Message-----
> From: Intel-gfx <intel-gfx-boun...@lists.freedesktop.org> On Behalf Of Imre
> Deak
> Sent: Wednesday, 29 January 2025 22.02
> To: intel-gfx@lists.freedesktop.org; intel...@lists.freedesktop.org
> Subject: [PATCH 14/17] drm/i915/ddi: Reuse helper to compute the HDMI
> DDI_BUF_CTL config
>
> Reuse the existing helper to compute the configuration value of the
> DDI_BUF_CTL
> register for HDMI outputs instead of open-coding this.
>
> Note that dropping the XE2LPD_DDI_BUF_D2D_LINK_ENABLE flag is ok, since an
> earlier mtl_ddi_enable_d2d() has set it already and intel_enable_ddi_buf()'s
> RMW will not update this flag.
>
Reviewed-by: Mika Kahola <mika.kah...@intel.com>
> Signed-off-by: Imre Deak <imre.d...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_ddi.c | 30 ++++++++----------------
> 1 file changed, 10 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c
> b/drivers/gpu/drm/i915/display/intel_ddi.c
> index dd8ae5cf96c70..e03ec9a235d33 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -339,11 +339,14 @@ static u32 intel_ddi_buf_ctl_config_val(struct
> intel_encoder *encoder,
> struct intel_display *display = to_intel_display(encoder);
> struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
> + bool is_dp = intel_crtc_has_dp_encoder(crtc_state);
> u32 val = 0;
>
> /* DDI_BUF_CTL_ENABLE will be set by intel_ddi_prepare_link_retrain()
> later */
> - val |= DDI_PORT_WIDTH(crtc_state->lane_count) |
> - DDI_BUF_TRANS_SELECT(0);
> + if (is_dp || DISPLAY_VER(display) >= 14)
> + val |= DDI_PORT_WIDTH(crtc_state->lane_count);
> +
> + val |= DDI_BUF_TRANS_SELECT(0);
>
> if (dig_port->lane_reversal)
> val |= DDI_BUF_PORT_REVERSAL;
> @@ -351,14 +354,15 @@ static u32 intel_ddi_buf_ctl_config_val(struct
> intel_encoder *encoder,
> val |= DDI_A_4_LANES;
>
> if (DISPLAY_VER(i915) >= 14) {
> - if (intel_dp_is_uhbr(crtc_state))
> + if (is_dp && intel_dp_is_uhbr(crtc_state))
> val |= DDI_BUF_PORT_DATA_40BIT;
> else
> val |= DDI_BUF_PORT_DATA_10BIT;
> }
>
> if (IS_ALDERLAKE_P(i915) && intel_encoder_is_tc(encoder)) {
> - val |= ddi_buf_phy_link_rate(crtc_state->port_clock);
> + if (is_dp)
> + val |= ddi_buf_phy_link_rate(crtc_state->port_clock);
> /*
> * TODO: remove the following once DDI_BUF_CTL is updated
> via
> * an RMW everywhere.
> @@ -367,7 +371,7 @@ static u32 intel_ddi_buf_ctl_config_val(struct
> intel_encoder *encoder,
> val |= DDI_BUF_CTL_TC_PHY_OWNERSHIP;
> }
>
> - if (IS_DISPLAY_VER(display, 11, 13) && intel_encoder_is_tc(encoder)) {
> + if (is_dp && IS_DISPLAY_VER(display, 11, 13) &&
> +intel_encoder_is_tc(encoder)) {
> int delay = dp_phy_lane_stagger_delay(crtc_state->port_clock);
>
> val |= DDI_BUF_LANE_STAGGER_DELAY(delay);
> @@ -3417,7 +3421,6 @@ static void intel_ddi_enable_hdmi(struct
> intel_atomic_state *state,
> struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
> struct drm_connector *connector = conn_state->connector;
> enum port port = encoder->port;
> - u32 buf_ctl = 0;
>
> if (!intel_hdmi_handle_sink_scrambling(encoder, connector,
> crtc_state-
> >hdmi_high_tmds_clock_ratio,
> @@ -3482,11 +3485,6 @@ static void intel_ddi_enable_hdmi(struct
> intel_atomic_state *state,
> * is filled with lane count, already set in the crtc_state.
> * The same is required to be filled in PORT_BUF_CTL for C10/20 Phy.
> */
> - if (dig_port->lane_reversal)
> - buf_ctl |= DDI_BUF_PORT_REVERSAL;
> - if (dig_port->ddi_a_4_lanes)
> - buf_ctl |= DDI_A_4_LANES;
> -
> if (DISPLAY_VER(dev_priv) >= 14) {
> u32 port_buf = 0;
>
> @@ -3497,17 +3495,9 @@ static void intel_ddi_enable_hdmi(struct
> intel_atomic_state *state,
>
> intel_de_rmw(dev_priv, XELPDP_PORT_BUF_CTL1(dev_priv,
> port),
> XELPDP_PORT_WIDTH_MASK |
> XELPDP_PORT_REVERSAL, port_buf);
> -
> - buf_ctl |= DDI_PORT_WIDTH(crtc_state->lane_count);
> -
> - if (DISPLAY_VER(dev_priv) >= 20)
> - buf_ctl |= XE2LPD_DDI_BUF_D2D_LINK_ENABLE;
> - } else if (IS_ALDERLAKE_P(dev_priv) && intel_encoder_is_tc(encoder)) {
> - drm_WARN_ON(&dev_priv->drm,
> !intel_tc_port_in_legacy_mode(dig_port));
> - buf_ctl |= DDI_BUF_CTL_TC_PHY_OWNERSHIP;
> }
>
> - intel_enable_ddi_buf(encoder, buf_ctl);
> + intel_enable_ddi_buf(encoder, intel_ddi_buf_ctl_config_val(encoder,
> +crtc_state));
> }
>
> static void intel_ddi_enable(struct intel_atomic_state *state,
> --
> 2.44.2
