[Intel-gfx] [PATCH 3/3] drm/i915/dc3co: Avoid full modeset when EXITLINE needs to be changed
Anshuamn Gupta
anshuman.gupta at intel.com
Wed Nov 13 11:38:21 UTC 2019
On 2019-10-31 at 17:14:22 -0700, José Roberto de Souza wrote:
> A recent change in BSpec allow us to change EXTLINE while transcoder
> is enabled so this allow us to change it even when doing the first
> fastset after taking over previous hardware state set by BIOS.
> BIOS don't enable PSR, so if sink supports PSR it will be enabled on
> the first fastset, so moving the EXTLINE compute and set to PSR flows
> allow us to simplfy a bunch of code.
>
> This will save a lot of time in all the IGT tests that uses CRC, as
> when PSR2 is enabled CRCs are not generated, so we switch to PSR1, so
> the previous code would compute dc3co_exitline=0 causing a full
> modeset that would shutdown pipe, enable and train link.
>
> BSpec: 49196
I am not able to find it explicitly that we can change
EXITLINE while transcoder is enabled in index 49196.
Which change actually u are referring?
> Cc: Imre Deak <imre.deak at intel.com>
> Cc: Anshuman Gupta <anshuman.gupta at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_ddi.c | 86 --------------------
> drivers/gpu/drm/i915/display/intel_display.c | 1 -
> drivers/gpu/drm/i915/display/intel_psr.c | 47 +++++++++++
> 3 files changed, 47 insertions(+), 87 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index b51f244ad7a5..f52fb7619d46 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -3339,86 +3339,6 @@ static void intel_ddi_disable_fec_state(struct intel_encoder *encoder,
> POSTING_READ(intel_dp->regs.dp_tp_ctl);
> }
>
> -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;
> -
> - 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);
> -}
> -
> -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)
> @@ -3431,7 +3351,6 @@ 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);
>
> @@ -3760,7 +3679,6 @@ 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,
> @@ -4308,9 +4226,6 @@ 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);
>
> @@ -4392,7 +4307,6 @@ static int intel_ddi_compute_config(struct intel_encoder *encoder,
> ret = intel_hdmi_compute_config(encoder, pipe_config, conn_state);
> } else {
> ret = intel_dp_compute_config(encoder, pipe_config, conn_state);
> - tgl_dc3co_exitline_compute_config(encoder, pipe_config);
> }
>
> if (ret)
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 348ce0456696..6c1c93b2a81f 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -13091,7 +13091,6 @@ 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_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
> index bb9b5349b72a..06a0a1c9621e 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -596,6 +596,37 @@ static void tgl_disallow_dc3co_on_psr2_exit(struct drm_i915_private *dev_priv)
> tgl_psr2_disable_dc3co(dev_priv);
> }
>
> +static void
> +tgl_dc3co_exitline_compute_config(struct intel_dp *intel_dp,
> + struct intel_crtc_state *crtc_state)
> +{
> + const u32 crtc_vdisplay = crtc_state->base.adjusted_mode.crtc_vdisplay;
> + struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> + struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> + u32 exit_scanlines;
> +
> + 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(crtc_state->base.crtc)->pipe != PIPE_A ||
> + dig_port->base.port != PORT_A)
> + return;
> +
> + /*
> + * DC3CO Exit time 200us B.Spec 49196
> + * PSR2 transcoder Early Exit scanlines = ROUNDUP(200 / line time) + 1
> + */
> + exit_scanlines =
> + intel_usecs_to_scanlines(&crtc_state->base.adjusted_mode, 200) + 1;
> +
> + if (WARN_ON(exit_scanlines > crtc_vdisplay))
> + return;
> +
> + crtc_state->dc3co_exitline = crtc_vdisplay - exit_scanlines;
> + DRM_DEBUG_KMS("DC3CO exit scanlines %d\n", crtc_state->dc3co_exitline);
> +}
> +
> static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
> struct intel_crtc_state *crtc_state)
> {
> @@ -658,6 +689,7 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
> return false;
> }
>
> + tgl_dc3co_exitline_compute_config(intel_dp, crtc_state);
> return true;
> }
>
> @@ -775,6 +807,21 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp,
> I915_WRITE(EDP_PSR_DEBUG(dev_priv->psr.transcoder), mask);
>
> psr_irq_control(dev_priv);
> +
> + if (INTEL_GEN(dev_priv) >= 12 && dev_priv->psr.psr2_enabled) {
> + u32 val;
> +
> + /*
> + * TODO: if future platforms supports DC3CO in more than one
> + * transcoder, EXITLINE will need to be unset when disabling PSR
> + */
> + val = I915_READ(EXITLINE(cpu_transcoder));
> + val &= ~(EXITLINE_MASK | EXITLINE_ENABLE);
> + val |= crtc_state->dc3co_exitline << EXITLINE_SHIFT;
> + if (crtc_state->dc3co_exitline)
> + val |= EXITLINE_ENABLE;
> + I915_WRITE(EXITLINE(cpu_transcoder), val);
> + }
> }
>
> static void intel_psr_enable_locked(struct drm_i915_private *dev_priv,
> --
> 2.23.0
>
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