On Wed, 16 Nov 2022, Khaled Almahallawy wrote:
> Bspecs has updated recently to remove the restriction to disable
> DDI/Transcoder before setting PHY test pattern. This update is to
> address PHY compliance test failures observed on a port with LTTPR.
> The issue is that when Transc. is disabled, the main link signals fed
> to LTTPR will be dropped invalidating link training, which will affect
> the quality of the phy test pattern when the transcoder is enabled again.
>
> v2: Update commit message (Clint)
> v3: Add missing Signed-off in v2
Bspec 7555 for pre-gen12 still says "TRANS_CONF and TRANS_DDI_FUNC_CTL
must be disabled prior to enabling the test pattern."
All I have against that is your word [1], and it's not even recorded in
the commit message.
BR,
Jani.
[1]
https://lore.kernel.org/r/8f0e921300db2b6a36497773d4508892e1ea5a43.ca...@intel.com
>
> Bspec: 50482
> Cc: Imre Deak
> Cc: Clint Taylor
> CC: Jani Nikula
> Tested-by: Khaled Almahallawy
> Signed-off-by: Khaled Almahallawy
> Reviewed-by: Clint Taylor
> ---
> drivers/gpu/drm/i915/display/intel_dp.c | 59 -
> 1 file changed, 59 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> b/drivers/gpu/drm/i915/display/intel_dp.c
> index 914161d7d122..16cf961b4d1a 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -3679,61 +3679,6 @@ static void intel_dp_phy_pattern_update(struct
> intel_dp *intel_dp,
> }
> }
>
> -static void
> -intel_dp_autotest_phy_ddi_disable(struct intel_dp *intel_dp,
> - const struct intel_crtc_state *crtc_state)
> -{
> - struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> - struct drm_device *dev = dig_port->base.base.dev;
> - struct drm_i915_private *dev_priv = to_i915(dev);
> - struct intel_crtc *crtc = to_intel_crtc(dig_port->base.base.crtc);
> - enum pipe pipe = crtc->pipe;
> - u32 trans_ddi_func_ctl_value, trans_conf_value, dp_tp_ctl_value;
> -
> - trans_ddi_func_ctl_value = intel_de_read(dev_priv,
> - TRANS_DDI_FUNC_CTL(pipe));
> - trans_conf_value = intel_de_read(dev_priv, PIPECONF(pipe));
> - dp_tp_ctl_value = intel_de_read(dev_priv, TGL_DP_TP_CTL(pipe));
> -
> - trans_ddi_func_ctl_value &= ~(TRANS_DDI_FUNC_ENABLE |
> - TGL_TRANS_DDI_PORT_MASK);
> - trans_conf_value &= ~PIPECONF_ENABLE;
> - dp_tp_ctl_value &= ~DP_TP_CTL_ENABLE;
> -
> - intel_de_write(dev_priv, PIPECONF(pipe), trans_conf_value);
> - intel_de_write(dev_priv, TRANS_DDI_FUNC_CTL(pipe),
> -trans_ddi_func_ctl_value);
> - intel_de_write(dev_priv, TGL_DP_TP_CTL(pipe), dp_tp_ctl_value);
> -}
> -
> -static void
> -intel_dp_autotest_phy_ddi_enable(struct intel_dp *intel_dp,
> - const struct intel_crtc_state *crtc_state)
> -{
> - struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> - struct drm_device *dev = dig_port->base.base.dev;
> - struct drm_i915_private *dev_priv = to_i915(dev);
> - enum port port = dig_port->base.port;
> - struct intel_crtc *crtc = to_intel_crtc(dig_port->base.base.crtc);
> - enum pipe pipe = crtc->pipe;
> - u32 trans_ddi_func_ctl_value, trans_conf_value, dp_tp_ctl_value;
> -
> - trans_ddi_func_ctl_value = intel_de_read(dev_priv,
> - TRANS_DDI_FUNC_CTL(pipe));
> - trans_conf_value = intel_de_read(dev_priv, PIPECONF(pipe));
> - dp_tp_ctl_value = intel_de_read(dev_priv, TGL_DP_TP_CTL(pipe));
> -
> - trans_ddi_func_ctl_value |= TRANS_DDI_FUNC_ENABLE |
> - TGL_TRANS_DDI_SELECT_PORT(port);
> - trans_conf_value |= PIPECONF_ENABLE;
> - dp_tp_ctl_value |= DP_TP_CTL_ENABLE;
> -
> - intel_de_write(dev_priv, PIPECONF(pipe), trans_conf_value);
> - intel_de_write(dev_priv, TGL_DP_TP_CTL(pipe), dp_tp_ctl_value);
> - intel_de_write(dev_priv, TRANS_DDI_FUNC_CTL(pipe),
> -trans_ddi_func_ctl_value);
> -}
> -
> static void intel_dp_process_phy_request(struct intel_dp *intel_dp,
>const struct intel_crtc_state
> *crtc_state)
> {
> @@ -3752,14 +3697,10 @@ static void intel_dp_process_phy_request(struct
> intel_dp *intel_dp,
> intel_dp_get_adjust_train(intel_dp, crtc_state, DP_PHY_DPRX,
> link_status);
>
> - intel_dp_autotest_phy_ddi_disable(intel_dp, crtc_state);
> -
> intel_dp_set_signal_levels(intel_dp, crtc_state, DP_PHY_DPRX);
>
> intel_dp_phy_pattern_update(intel_dp, crtc_state);
>
> - intel_dp_autotest_phy_ddi_enable(intel_dp, crtc_state);
> -
> drm_dp_dpcd_write(_dp->aux, DP_TRAINING_LANE0_SET,
> intel_dp->train_set, crtc_state->lane_count);
--
Jani Nikula, Intel Open Source Graphics Center
