From: José Roberto de Souza jose.souza@intel.com
[ Upstream commit 12399028751b887bdc2515f1a1e2c81b4fd74085 ]
Right now dp.regs.dp_tp_ctl/status are only set during the encoder pre_enable() hook, what is causing all reads and writes to those registers to go to offset 0x0 before pre_enable() is executed.
So if i915 takes the BIOS state and don't do a modeset any following link retraing will fail.
In the case that i915 needs to do a modeset, the DDI disable sequence will write to a wrong register not disabling DP 'Transport Enable' in DP_TP_CTL, making a HDMI modeset in the same port/transcoder to not light up the monitor.
So here for GENs older than 12, that have those registers fixed at port offset range it is loading at encoder/port init while for GEN12 it will keep setting it at encoder pre_enable() and during HW state readout.
Fixes: 4444df6e205b ("drm/i915/tgl: move DP_TP_* to transcoder") Cc: Matt Roper matthew.d.roper@intel.com Cc: Lucas De Marchi lucas.demarchi@intel.com Signed-off-by: José Roberto de Souza jose.souza@intel.com Reviewed-by: Matt Roper matthew.d.roper@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20200414230442.262092-1-jose.s... (cherry picked from commit edcb9028d66b44d74ba4f8b9daa379b004dc1f85) Signed-off-by: Rodrigo Vivi rodrigo.vivi@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/i915/display/intel_ddi.c | 14 +++++++++++--- drivers/gpu/drm/i915/display/intel_dp.c | 5 ++--- 2 files changed, 13 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c index 2fe594952748d..d3c58026d55e6 100644 --- a/drivers/gpu/drm/i915/display/intel_ddi.c +++ b/drivers/gpu/drm/i915/display/intel_ddi.c @@ -3545,9 +3545,6 @@ static void hsw_ddi_pre_enable_dp(struct intel_encoder *encoder, intel_dp_set_link_params(intel_dp, crtc_state->port_clock, crtc_state->lane_count, is_mst);
- intel_dp->regs.dp_tp_ctl = DP_TP_CTL(port); - intel_dp->regs.dp_tp_status = DP_TP_STATUS(port); - intel_edp_panel_on(intel_dp);
intel_ddi_clk_select(encoder, crtc_state); @@ -4269,12 +4266,18 @@ void intel_ddi_get_config(struct intel_encoder *encoder, struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->uapi.crtc); enum transcoder cpu_transcoder = pipe_config->cpu_transcoder; + struct intel_dp *intel_dp = enc_to_intel_dp(encoder); u32 temp, flags = 0;
/* XXX: DSI transcoder paranoia */ if (WARN_ON(transcoder_is_dsi(cpu_transcoder))) return;
+ if (INTEL_GEN(dev_priv) >= 12) { + intel_dp->regs.dp_tp_ctl = TGL_DP_TP_CTL(cpu_transcoder); + intel_dp->regs.dp_tp_status = TGL_DP_TP_STATUS(cpu_transcoder); + } + intel_dsc_get_config(encoder, pipe_config);
temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder)); @@ -4492,6 +4495,7 @@ static const struct drm_encoder_funcs intel_ddi_funcs = { static struct intel_connector * intel_ddi_init_dp_connector(struct intel_digital_port *intel_dig_port) { + struct drm_i915_private *dev_priv = to_i915(intel_dig_port->base.base.dev); struct intel_connector *connector; enum port port = intel_dig_port->base.port;
@@ -4502,6 +4506,10 @@ intel_ddi_init_dp_connector(struct intel_digital_port *intel_dig_port) intel_dig_port->dp.output_reg = DDI_BUF_CTL(port); intel_dig_port->dp.prepare_link_retrain = intel_ddi_prepare_link_retrain; + if (INTEL_GEN(dev_priv) < 12) { + intel_dig_port->dp.regs.dp_tp_ctl = DP_TP_CTL(port); + intel_dig_port->dp.regs.dp_tp_status = DP_TP_STATUS(port); + }
if (!intel_dp_init_connector(intel_dig_port, connector)) { kfree(connector); diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index c7424e2a04a35..fa3a9e9e0b290 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -2492,9 +2492,6 @@ static void intel_dp_prepare(struct intel_encoder *encoder, intel_crtc_has_type(pipe_config, INTEL_OUTPUT_DP_MST));
- intel_dp->regs.dp_tp_ctl = DP_TP_CTL(port); - intel_dp->regs.dp_tp_status = DP_TP_STATUS(port); - /* * There are four kinds of DP registers: * @@ -7616,6 +7613,8 @@ bool intel_dp_init(struct drm_i915_private *dev_priv,
intel_dig_port->dp.output_reg = output_reg; intel_dig_port->max_lanes = 4; + intel_dig_port->dp.regs.dp_tp_ctl = DP_TP_CTL(port); + intel_dig_port->dp.regs.dp_tp_status = DP_TP_STATUS(port);
intel_encoder->type = INTEL_OUTPUT_DP; intel_encoder->power_domain = intel_port_to_power_domain(port);