Re: [Intel-gfx] [PATCH] drm/i915: Nuke dg2_ddi_pre_enable_dp()

[Jani Nikula <jani.nikula@linux.intel.com>]

On Wed, 19 Jan 2022, Ville Syrjala <ville.syrjala@linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> dg2_ddi_pre_enable_dp() has outlived its usefulness so eliminate
> it.
>
> The one thing that tgl_ddi_pre_enable_dp() is missing that we
> need is intel_ddi_config_transcoder_dp2(). So we'll bring that
> over.
>
> tgl_ddi_pre_enable_dp() does also have a few things that
> dg2_ddi_pre_enable_dp() didn't have:
> - icl_program_mg_dp_mode() -> nop due to intel_phy_is_tc()==false on DG2
> - intel_ddi_power_up_lanes() -> nop due to intel_phy_is_combo()==false on DG2
> - intel_ddi_mso_configure() -> only matters for MSO panels
>
> Another slight difference is that dg2_ddi_pre_enable_dp() was
> missing a bigjoiner check around intel_dsc_enable(), which
> tgl_ddi_pre_enable_dp() does have.

Reviewed-by: Jani Nikula <jani.nikula@intel.com>

The modeset step bspec references could use a cleanup too. If they
aren't stable number&letter combos for *one* platform, let alone many,
we should probably just remove them.

>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_ddi.c | 117 +----------------------
>  1 file changed, 4 insertions(+), 113 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index 4e93eac926a5..2f20abc5122d 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -2289,116 +2289,6 @@ static void intel_ddi_mso_configure(const struct intel_crtc_state *crtc_state)
>  		     OVERLAP_PIXELS_MASK, dss1);
>  }
>  
> -static void dg2_ddi_pre_enable_dp(struct intel_atomic_state *state,
> -				  struct intel_encoder *encoder,
> -				  const struct intel_crtc_state *crtc_state,
> -				  const struct drm_connector_state *conn_state)
> -{
> -	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> -	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> -	struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
> -	bool is_mst = intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP_MST);
> -
> -	intel_dp_set_link_params(intel_dp, crtc_state->port_clock,
> -				 crtc_state->lane_count);
> -
> -	/*
> -	 * We only configure what the register value will be here.  Actual
> -	 * enabling happens during link training farther down.
> -	 */
> -	intel_ddi_init_dp_buf_reg(encoder, crtc_state);
> -
> -	/*
> -	 * 1. Enable Power Wells
> -	 *
> -	 * This was handled at the beginning of intel_atomic_commit_tail(),
> -	 * before we called down into this function.
> -	 */
> -
> -	/* 2. Enable Panel Power if PPS is required */
> -	intel_pps_on(intel_dp);
> -
> -	/*
> -	 * 3. Enable the port PLL.
> -	 */
> -	intel_ddi_enable_clock(encoder, crtc_state);
> -
> -	/* 4. Enable IO power */
> -	if (!intel_tc_port_in_tbt_alt_mode(dig_port))
> -		dig_port->ddi_io_wakeref = intel_display_power_get(dev_priv,
> -								   dig_port->ddi_io_power_domain);
> -
> -	/*
> -	 * 5. The rest of the below are substeps under the bspec's "Enable and
> -	 * Train Display Port" step.  Note that steps that are specific to
> -	 * MST will be handled by intel_mst_pre_enable_dp() before/after it
> -	 * calls into this function.  Also intel_mst_pre_enable_dp() only calls
> -	 * us when active_mst_links==0, so any steps designated for "single
> -	 * stream or multi-stream master transcoder" can just be performed
> -	 * unconditionally here.
> -	 */
> -
> -	/*
> -	 * 5.a Configure Transcoder Clock Select to direct the Port clock to the
> -	 * Transcoder.
> -	 */
> -	intel_ddi_enable_pipe_clock(encoder, crtc_state);
> -
> -	/* 5.b Configure transcoder for DP 2.0 128b/132b */
> -	intel_ddi_config_transcoder_dp2(encoder, crtc_state);
> -
> -	/*
> -	 * 5.c Configure TRANS_DDI_FUNC_CTL DDI Select, DDI Mode Select & MST
> -	 * Transport Select
> -	 */
> -	intel_ddi_config_transcoder_func(encoder, crtc_state);
> -
> -	/*
> -	 * 5.d Configure & enable DP_TP_CTL with link training pattern 1
> -	 * selected
> -	 *
> -	 * This will be handled by the intel_dp_start_link_train() farther
> -	 * down this function.
> -	 */
> -
> -	/* 5.e Configure voltage swing and related IO settings */
> -	encoder->set_signal_levels(encoder, crtc_state);
> -
> -	if (!is_mst)
> -		intel_dp_set_power(intel_dp, DP_SET_POWER_D0);
> -
> -	intel_dp_configure_protocol_converter(intel_dp, crtc_state);
> -	intel_dp_sink_set_decompression_state(intel_dp, crtc_state, true);
> -	/*
> -	 * DDI FEC: "anticipates enabling FEC encoding sets the FEC_READY bit
> -	 * in the FEC_CONFIGURATION register to 1 before initiating link
> -	 * training
> -	 */
> -	intel_dp_sink_set_fec_ready(intel_dp, crtc_state);
> -	intel_dp_check_frl_training(intel_dp);
> -	intel_dp_pcon_dsc_configure(intel_dp, crtc_state);
> -
> -	/*
> -	 * 5.h Follow DisplayPort specification training sequence (see notes for
> -	 *     failure handling)
> -	 * 5.i If DisplayPort multi-stream - Set DP_TP_CTL link training to Idle
> -	 *     Pattern, wait for 5 idle patterns (DP_TP_STATUS Min_Idles_Sent)
> -	 *     (timeout after 800 us)
> -	 */
> -	intel_dp_start_link_train(intel_dp, crtc_state);
> -
> -	/* 5.j Set DP_TP_CTL link training to Normal */
> -	if (!is_trans_port_sync_mode(crtc_state))
> -		intel_dp_stop_link_train(intel_dp, crtc_state);
> -
> -	/* 5.k Configure and enable FEC if needed */
> -	intel_ddi_enable_fec(encoder, crtc_state);
> -
> -	intel_dsc_dp_pps_write(encoder, crtc_state);
> -
> -	intel_dsc_enable(crtc_state);
> -}
> -
>  static void tgl_ddi_pre_enable_dp(struct intel_atomic_state *state,
>  				  struct intel_encoder *encoder,
>  				  const struct intel_crtc_state *crtc_state,
> @@ -2472,6 +2362,9 @@ static void tgl_ddi_pre_enable_dp(struct intel_atomic_state *state,
>  	 */
>  	intel_ddi_enable_pipe_clock(encoder, crtc_state);
>  
> +	if (HAS_DP20(dev_priv))
> +		intel_ddi_config_transcoder_dp2(encoder, crtc_state);
> +
>  	/*
>  	 * 7.b Configure TRANS_DDI_FUNC_CTL DDI Select, DDI Mode Select & MST
>  	 * Transport Select
> @@ -2612,9 +2505,7 @@ static void intel_ddi_pre_enable_dp(struct intel_atomic_state *state,
>  {
>  	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
>  
> -	if (IS_DG2(dev_priv))
> -		dg2_ddi_pre_enable_dp(state, encoder, crtc_state, conn_state);
> -	else if (DISPLAY_VER(dev_priv) >= 12)
> +	if (DISPLAY_VER(dev_priv) >= 12)
>  		tgl_ddi_pre_enable_dp(state, encoder, crtc_state, conn_state);
>  	else
>  		hsw_ddi_pre_enable_dp(state, encoder, crtc_state, conn_state);

-- 
Jani Nikula, Intel Open Source Graphics Center