On Mon, Sep 30, 2019 at 11:11:35PM +0530, Anshuman Gupta wrote:
> DC3CO enabling B.Specs sequence requires to enable end configure
> exit scanlines to TRANS_EXITLINE register, programming this register
> has to be part of modeset sequence as this can't be change when
> transcoder or port is enabled.
> When system boots with only eDP panel there may not be real
> modeset as BIOS has already programmed the necessary registers,
> therefore it needs to force a modeset to enable and configure
> DC3CO exitline.
>
> v1: Computing dc3co_exitline crtc state from a DP encoder
> compute config. [Imre]
> Enabling and disabling DC3CO PSR2 transcoder exitline from
> encoder pre_enable and post_disable hooks. [Imre]
> Computing dc3co_exitline instead of has_dc3co_exitline bool. [Imre]
> v2: Code refactoring for symmetry and to avoid exported function. [Imre]
> Removing IS_TIGERLAKE check from compute_config, adding PIPE_A
> restriction and clearing dc3co_exitline state if crtc is not active
> or it is not PSR2 capable in dc3co exitline compute_config. [Imre]
> Using IS_TGL check and dc3co exitline get_config
>
> Cc: Jani Nikula <jani.nik...@intel.com>
> Cc: Imre Deak <imre.d...@intel.com>
> Cc: Animesh Manna <animesh.ma...@intel.com>
> Signed-off-by: Anshuman Gupta <anshuman.gu...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_ddi.c | 104 +++++++++++++++++-
> drivers/gpu/drm/i915/display/intel_display.c | 1 +
> .../drm/i915/display/intel_display_types.h | 1 +
> drivers/gpu/drm/i915/i915_drv.h | 1 +
> 4 files changed, 105 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c
> b/drivers/gpu/drm/i915/display/intel_ddi.c
> index aa470c70a198..d779a33c70db 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -45,6 +45,7 @@
> #include "intel_lspcon.h"
> #include "intel_panel.h"
> #include "intel_psr.h"
> +#include "intel_sprite.h"
> #include "intel_tc.h"
> #include "intel_vdsc.h"
>
> @@ -3200,6 +3201,97 @@ static void intel_ddi_disable_fec_state(struct
> intel_encoder *encoder,
> POSTING_READ(intel_dp->regs.dp_tp_ctl);
> }
>
> +static u32 intel_get_frame_time_us(const struct intel_crtc_state *cstate)
> +{
> + if (!cstate || !cstate->base.active)
> + return 0;
> +
> + return DIV_ROUND_UP(1000 * 1000,
> + drm_mode_vrefresh(&cstate->base.adjusted_mode));
> +}
> +
> +static void
> +tgl_clear_psr2_transcoder_exitline(const struct intel_crtc_state *cstate)
> +{
> + struct drm_i915_private *dev_priv = to_i915(cstate->base.crtc->dev);
> + u32 val;
> +
> + if (!cstate->dc3co_exitline)
> + return;
> +
> + val = I915_READ(EXITLINE(cstate->cpu_transcoder));
> + val &= ~(EXITLINE_MASK | EXITLINE_ENABLE);
> + I915_WRITE(EXITLINE(cstate->cpu_transcoder), val);
> +}
> +
> +static void
> +tgl_set_psr2_transcoder_exitline(const struct intel_crtc_state *cstate)
> +{
> + u32 val, exit_scanlines;
> + struct drm_i915_private *dev_priv = to_i915(cstate->base.crtc->dev);
> +
> + if (!cstate->dc3co_exitline)
> + return;
> +
> + exit_scanlines = cstate->dc3co_exitline;
> + exit_scanlines <<= EXITLINE_SHIFT;
> + val = I915_READ(EXITLINE(cstate->cpu_transcoder));
> + val &= ~(EXITLINE_MASK | EXITLINE_ENABLE);
> + val |= exit_scanlines;
> + val |= EXITLINE_ENABLE;
> + I915_WRITE(EXITLINE(cstate->cpu_transcoder), val);
> +}
> +
> +static void tgl_dc3co_exitline_compute_config(struct intel_encoder *encoder,
> + struct intel_crtc_state *cstate)
> +{
> + u32 exit_scanlines;
> + struct drm_i915_private *dev_priv = to_i915(cstate->base.crtc->dev);
> + u32 crtc_vdisplay = cstate->base.adjusted_mode.crtc_vdisplay;
> +
> + dev_priv->psr.dc3co_frame_time_us = 0;
dev_priv->psr may be unrelated to this commit, so we can't update it
here; let's compute/set it in intel_psr_enable_locked().
> + cstate->dc3co_exitline = 0;
> +
> + if (!(dev_priv->csr.allowed_dc_mask & DC_STATE_EN_DC3CO))
> + return;
> +
> + /* B.Specs:49196 DC3CO only works with pipeA and DDIA.*/
> + if (to_intel_crtc(cstate->base.crtc)->pipe != PIPE_A ||
> + encoder->port != PORT_A)
> + return;
> +
> + if (!cstate->has_psr2 || !cstate->base.active)
> + return;
> +
> + /*
> + * DC3CO Exit time 200us B.Spec 49196
> + * PSR2 transcoder Early Exit scanlines = ROUNDUP(200 / line time) + 1
> + */
> + exit_scanlines =
> + intel_usecs_to_scanlines(&cstate->base.adjusted_mode, 200) + 1;
> +
> + if (WARN_ON(exit_scanlines > crtc_vdisplay))
> + return;
> +
> + cstate->dc3co_exitline = crtc_vdisplay - exit_scanlines;
> + DRM_DEBUG_KMS("DC3CO exit scanlines %d\n", cstate->dc3co_exitline);
> + dev_priv->psr.dc3co_frame_time_us = intel_get_frame_time_us(cstate);
> +}
> +
> +static void tgl_dc3co_exitline_get_config(struct intel_crtc_state
> *crtc_state)
> +{
> + u32 val;
> + struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
> +
> + if (INTEL_GEN(dev_priv) < 12)
> + return;
> +
> + val = I915_READ(EXITLINE(crtc_state->cpu_transcoder));
> +
> + if (val & EXITLINE_ENABLE)
> + crtc_state->dc3co_exitline = val & EXITLINE_MASK;
> +}
> +
> static void tgl_ddi_pre_enable_dp(struct intel_encoder *encoder,
> const struct intel_crtc_state *crtc_state,
> const struct drm_connector_state *conn_state)
> @@ -3212,6 +3304,7 @@ static void tgl_ddi_pre_enable_dp(struct intel_encoder
> *encoder,
> int level = intel_ddi_dp_level(intel_dp);
> enum transcoder transcoder = crtc_state->cpu_transcoder;
>
> + tgl_set_psr2_transcoder_exitline(crtc_state);
> intel_dp_set_link_params(intel_dp, crtc_state->port_clock,
> crtc_state->lane_count, is_mst);
>
> @@ -3524,6 +3617,7 @@ static void intel_ddi_post_disable_dp(struct
> intel_encoder *encoder,
>
> dig_port->ddi_io_power_domain);
>
> intel_ddi_clk_disable(encoder);
> + tgl_clear_psr2_transcoder_exitline(old_crtc_state);
> }
>
> static void intel_ddi_post_disable_hdmi(struct intel_encoder *encoder,
> @@ -4070,6 +4164,9 @@ void intel_ddi_get_config(struct intel_encoder *encoder,
> break;
> }
>
> + if (encoder->type == INTEL_OUTPUT_EDP)
> + tgl_dc3co_exitline_get_config(pipe_config);
> +
> pipe_config->has_audio =
> intel_ddi_is_audio_enabled(dev_priv, cpu_transcoder);
>
> @@ -4147,10 +4244,13 @@ static int intel_ddi_compute_config(struct
> intel_encoder *encoder,
> if (HAS_TRANSCODER_EDP(dev_priv) && port == PORT_A)
> pipe_config->cpu_transcoder = TRANSCODER_EDP;
>
> - if (intel_crtc_has_type(pipe_config, INTEL_OUTPUT_HDMI))
> + if (intel_crtc_has_type(pipe_config, INTEL_OUTPUT_HDMI)) {
> ret = intel_hdmi_compute_config(encoder, pipe_config,
> conn_state);
> - else
> + } else {
> ret = intel_dp_compute_config(encoder, pipe_config, conn_state);
> + tgl_dc3co_exitline_compute_config(encoder, pipe_config);
> + }
> +
> if (ret)
> return ret;
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> b/drivers/gpu/drm/i915/display/intel_display.c
> index 8f125f1624bd..a467c7523e06 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -12820,6 +12820,7 @@ intel_pipe_config_compare(const struct
> intel_crtc_state *current_config,
>
> PIPE_CONF_CHECK_I(pixel_multiplier);
> PIPE_CONF_CHECK_I(output_format);
> + PIPE_CONF_CHECK_I(dc3co_exitline);
> PIPE_CONF_CHECK_BOOL(has_hdmi_sink);
> if ((INTEL_GEN(dev_priv) < 8 && !IS_HASWELL(dev_priv)) ||
> IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
> b/drivers/gpu/drm/i915/display/intel_display_types.h
> index 976669f01a8c..8aa38ace7845 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -870,6 +870,7 @@ struct intel_crtc_state {
>
> bool has_psr;
> bool has_psr2;
> + u32 dc3co_exitline;
>
> /*
> * Frequence the dpll for the port should run at. Differs from the
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index cddc98ea9965..7b2318c5c7a0 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -495,6 +495,7 @@ struct i915_psr {
> bool link_standby;
> bool colorimetry_support;
> bool psr2_enabled;
> + u32 dc3co_frame_time_us;
> u8 sink_sync_latency;
> ktime_t last_entry_attempt;
> ktime_t last_exit;
> --
> 2.21.0
>
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