On Fri, Sep 15, 2023 at 10:46:31AM -0700, Lucas De Marchi wrote:
> From: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
>
> We use multiple variables for HDMI and DisplayPort to store the value of
> DDI_BUF_CTL register (now called DDI_CTL_DE in the spec). Consolidate it
> to just one in struct intel_digital_port. This is a preparation step for
> future changes in D2D enable/disable sequence for xe2lpd that need to
> save some additional bits.
>
> Cc: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
> Cc: Gustavo Sousa <gustavo.sousa@xxxxxxxxx>
> Cc: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
> Signed-off-by: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
> Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_ddi.c | 36 +++++++++++-------------
> drivers/gpu/drm/i915/display/intel_dp.c | 2 +-
> 2 files changed, 18 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index 4668de45d6fe..29c9386659ff 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -325,26 +325,25 @@ static void intel_ddi_init_dp_buf_reg(struct intel_encoder *encoder,
> const struct intel_crtc_state *crtc_state)
> {
> struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> - struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
> enum phy phy = intel_port_to_phy(i915, encoder->port);
>
> /* DDI_BUF_CTL_ENABLE will be set by intel_ddi_prepare_link_retrain() later */
> - intel_dp->DP = dig_port->saved_port_bits |
> + dig_port->saved_port_bits |=
Before this patch, saved_port_bits was a copy of DDI_BUF_PORT_REVERSAL
and DDI_A_4_LANES, either based on a value we readout from hardware at
startup, or based on VBT settings. So it was a value of some
fundamental settings that we "saved" once at startup time and could then
just re-use thereafter.
If we're going to start saving per-modeset information (such as lane
count and link rate), then that's a pretty fundamental change to the
purpose of this field, and "saved_port_bits" doesn't really feel like an
appropriate name anymore. We should probably rename it and add some
documentation on the field explaining exactly what its purpose is and
how/when it gets updated.
> DDI_PORT_WIDTH(crtc_state->lane_count) |
> DDI_BUF_TRANS_SELECT(0);
>
> if (DISPLAY_VER(i915) >= 14) {
> if (intel_dp_is_uhbr(crtc_state))
> - intel_dp->DP |= DDI_BUF_PORT_DATA_40BIT;
> + dig_port->saved_port_bits |= DDI_BUF_PORT_DATA_40BIT;
> else
> - intel_dp->DP |= DDI_BUF_PORT_DATA_10BIT;
> + dig_port->saved_port_bits |= DDI_BUF_PORT_DATA_10BIT;
> }
>
> if (IS_ALDERLAKE_P(i915) && intel_phy_is_tc(i915, phy)) {
> - intel_dp->DP |= ddi_buf_phy_link_rate(crtc_state->port_clock);
> + dig_port->saved_port_bits |= ddi_buf_phy_link_rate(crtc_state->port_clock);
> if (!intel_tc_port_in_tbt_alt_mode(dig_port))
> - intel_dp->DP |= DDI_BUF_CTL_TC_PHY_OWNERSHIP;
> + dig_port->saved_port_bits |= DDI_BUF_CTL_TC_PHY_OWNERSHIP;
> }
> }
>
> @@ -1450,7 +1449,7 @@ hsw_set_signal_levels(struct intel_encoder *encoder,
> const struct intel_crtc_state *crtc_state)
> {
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> - struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> + struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
> int level = intel_ddi_level(encoder, crtc_state, 0);
> enum port port = encoder->port;
> u32 signal_levels;
> @@ -1467,10 +1466,10 @@ hsw_set_signal_levels(struct intel_encoder *encoder,
> drm_dbg_kms(&dev_priv->drm, "Using signal levels %08x\n",
> signal_levels);
>
> - intel_dp->DP &= ~DDI_BUF_EMP_MASK;
> - intel_dp->DP |= signal_levels;
> + dig_port->saved_port_bits &= ~DDI_BUF_EMP_MASK;
> + dig_port->saved_port_bits |= signal_levels;
>
> - intel_de_write(dev_priv, DDI_BUF_CTL(port), intel_dp->DP);
> + intel_de_write(dev_priv, DDI_BUF_CTL(port), dig_port->saved_port_bits);
> intel_de_posting_read(dev_priv, DDI_BUF_CTL(port));
> }
>
> @@ -3145,7 +3144,6 @@ static void intel_enable_ddi_hdmi(struct intel_atomic_state *state,
> struct drm_connector *connector = conn_state->connector;
> enum port port = encoder->port;
> enum phy phy = intel_port_to_phy(dev_priv, port);
> - u32 buf_ctl;
>
> if (!intel_hdmi_handle_sink_scrambling(encoder, connector,
> crtc_state->hdmi_high_tmds_clock_ratio,
> @@ -3211,7 +3209,7 @@ static void intel_enable_ddi_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.
> */
> - buf_ctl = dig_port->saved_port_bits | DDI_BUF_CTL_ENABLE;
> + dig_port->saved_port_bits |= DDI_BUF_CTL_ENABLE;
> if (DISPLAY_VER(dev_priv) >= 14) {
> u8 lane_count = mtl_get_port_width(crtc_state->lane_count);
> u32 port_buf = 0;
> @@ -3224,13 +3222,13 @@ static void intel_enable_ddi_hdmi(struct intel_atomic_state *state,
> intel_de_rmw(dev_priv, XELPDP_PORT_BUF_CTL1(port),
> XELPDP_PORT_WIDTH_MASK | XELPDP_PORT_REVERSAL, port_buf);
>
> - buf_ctl |= DDI_PORT_WIDTH(lane_count);
> + dig_port->saved_port_bits |= DDI_PORT_WIDTH(lane_count);
> } else if (IS_ALDERLAKE_P(dev_priv) && intel_phy_is_tc(dev_priv, phy)) {
> drm_WARN_ON(&dev_priv->drm, !intel_tc_port_in_legacy_mode(dig_port));
> - buf_ctl |= DDI_BUF_CTL_TC_PHY_OWNERSHIP;
> + dig_port->saved_port_bits |= DDI_BUF_CTL_TC_PHY_OWNERSHIP;
> }
>
> - intel_de_write(dev_priv, DDI_BUF_CTL(port), buf_ctl);
> + intel_de_write(dev_priv, DDI_BUF_CTL(port), dig_port->saved_port_bits);
>
> intel_wait_ddi_buf_active(dev_priv, port);
>
> @@ -3448,8 +3446,8 @@ static void mtl_ddi_prepare_link_retrain(struct intel_dp *intel_dp,
> mtl_port_buf_ctl_program(encoder, crtc_state);
>
> /* 6.i Configure and enable DDI_CTL_DE to start sending valid data to port slice */
> - intel_dp->DP |= DDI_BUF_CTL_ENABLE;
> - intel_de_write(dev_priv, DDI_BUF_CTL(port), intel_dp->DP);
> + dig_port->saved_port_bits |= DDI_BUF_CTL_ENABLE;
> + intel_de_write(dev_priv, DDI_BUF_CTL(port), dig_port->saved_port_bits);
> intel_de_posting_read(dev_priv, DDI_BUF_CTL(port));
>
> /* 6.j Poll for PORT_BUF_CTL Idle Status == 0, timeout after 100 us */
> @@ -3499,8 +3497,8 @@ static void intel_ddi_prepare_link_retrain(struct intel_dp *intel_dp,
> (intel_tc_port_in_dp_alt_mode(dig_port) || intel_tc_port_in_legacy_mode(dig_port)))
> adlp_tbt_to_dp_alt_switch_wa(encoder);
>
> - intel_dp->DP |= DDI_BUF_CTL_ENABLE;
> - intel_de_write(dev_priv, DDI_BUF_CTL(port), intel_dp->DP);
> + dig_port->saved_port_bits |= DDI_BUF_CTL_ENABLE;
> + intel_de_write(dev_priv, DDI_BUF_CTL(port), dig_port->saved_port_bits);
> intel_de_posting_read(dev_priv, DDI_BUF_CTL(port));
>
> intel_wait_ddi_buf_active(dev_priv, port);
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 189c5737e63a..2346cd32f5a7 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -6025,7 +6025,7 @@ intel_dp_init_connector(struct intel_digital_port *dig_port,
> intel_dp->pps.active_pipe = INVALID_PIPE;
>
> /* Preserve the current hw state. */
> - intel_dp->DP = intel_de_read(dev_priv, intel_dp->output_reg);
> + dig_port->saved_port_bits = intel_de_read(dev_priv, intel_dp->output_reg);
Isn't this going to potentially clobber the lane reversal setting we
determined from the VBT near the beginning of intel_ddi_init()?
Matt
> intel_dp->attached_connector = intel_connector;
>
> if (_intel_dp_is_port_edp(dev_priv, intel_encoder->devdata, port)) {
> --
> 2.40.1
>
--
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation
