@@ -3212,6 +3212,8 @@ 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;
+ /* Program the dc3co psr2 transcoder exitline */
+ tgl_set_psr2_transcoder_exitline(crtc_state);
intel_dp_set_link_params(intel_dp, crtc_state->port_clock,
crtc_state->lane_count, is_mst);
@@ -3521,6 +3523,8 @@ static void intel_ddi_post_disable_dp(struct intel_encoder *encoder,
dig_port->ddi_io_power_domain);
intel_ddi_clk_disable(encoder);
+ /* Disable the dc3co psr2 transcoder exitline */
+ tgl_clear_psr2_transcoder_exitline(old_crtc_state);
}
static void intel_ddi_post_disable_hdmi(struct intel_encoder *encoder,
@@ -4050,6 +4054,9 @@ 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);
@@ -12739,6 +12739,7 @@ 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))
@@ -19,6 +19,7 @@
#include "intel_hotplug.h"
#include "intel_sideband.h"
#include "intel_tc.h"
+#include "intel_pm.h"
bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv,
enum i915_power_well_id power_well_id);
@@ -772,6 +773,105 @@ static void gen9_set_dc_state(struct drm_i915_private *dev_priv, u32 state)
dev_priv->csr.dc_state = val & mask;
}
+int intel_get_scan_linetime_us(const struct drm_display_mode *adjusted_mode)
+{
+ /* paranoia */
+ if (WARN_ON(!adjusted_mode->crtc_clock))
+ return 0;
+
+ return DIV_ROUND_UP(1000 * adjusted_mode->crtc_htotal,
+ adjusted_mode->crtc_clock);
+}
+
+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);
+}
+
+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);
+}
+
+/*
+ * DC3CO requires to enable exitline and program DC3CO requires
+ * exit scanlines to TRANS_EXITLINE register, which should only
+ * change before transcoder or port are enabled.
+ * This requires to disable the fastset at boot for eDP output.
+ */
+void tgl_dc3co_exitline_compute_config(struct intel_encoder *encoder,
+ struct intel_crtc_state *crtc_state)
+{
+ u32 linetime_us, exit_scanlines;
+ struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
+ u32 crtc_vdisplay = crtc_state->base.adjusted_mode.crtc_vdisplay;
+
+ if (!IS_TIGERLAKE(dev_priv))
+ return;
+
+ if (!(dev_priv->csr.allowed_dc_mask & DC_STATE_EN_DC3CO))
+ return;
+
+ /* B.Specs:49196 DC3CO only works with pipeA and DDIA.*/
+ if (encoder->port != PORT_A)
+ return;
+
+ if (!crtc_state->has_psr2 || !crtc_state->base.active)
+ return;
+
+ linetime_us =
+ intel_get_scan_linetime_us(&crtc_state->base.adjusted_mode);
+
+ if (WARN_ON(!linetime_us))
+ return;
+ /*
+ * DC3CO Exit time 200us B.Spec 49196
+ * PSR2 transcoder Early Exit scanlines = ROUNDUP(200 / line time) + 1
+ */
+ exit_scanlines = DIV_ROUND_UP(200, linetime_us) + 1;
+ if (WARN_ON(exit_scanlines > crtc_vdisplay))
+ return;
+
+ crtc_state->dc3co_exitline = crtc_vdisplay - exit_scanlines;
+}
+
+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 (!IS_TIGERLAKE(dev_priv))
+ return;
+
+ if (!(dev_priv->csr.allowed_dc_mask & DC_STATE_EN_DC3CO))
+ return;
+
+ val = I915_READ(EXITLINE(crtc_state->cpu_transcoder));
+
+ if (val & EXITLINE_ENABLE)
+ crtc_state->dc3co_exitline = val & EXITLINE_MASK;
+}
+
static void
allowed_dc_mask_to_target_dc_state(struct drm_i915_private *dev_priv)
{
@@ -12,6 +12,8 @@
struct drm_i915_private;
struct intel_encoder;
+struct intel_crtc_state;
+struct intel_atomic_state;
enum intel_display_power_domain {
POWER_DOMAIN_DISPLAY_CORE,
@@ -258,6 +260,11 @@ void intel_display_power_resume_early(struct drm_i915_private *i915);
void intel_display_power_suspend(struct drm_i915_private *i915);
void intel_display_power_resume(struct drm_i915_private *i915);
void tgl_set_target_dc_state(struct drm_i915_private *dev_priv, u32 state);
+void tgl_dc3co_exitline_compute_config(struct intel_encoder *encoder,
+ struct intel_crtc_state *crtc_state);
+void tgl_dc3co_exitline_get_config(struct intel_crtc_state *crtc_state);
+void tgl_clear_psr2_transcoder_exitline(const struct intel_crtc_state *state);
+void tgl_set_psr2_transcoder_exitline(const struct intel_crtc_state *state);
const char *
intel_display_power_domain_str(enum intel_display_power_domain domain);
@@ -871,6 +871,7 @@ 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
@@ -2267,6 +2267,8 @@ intel_dp_compute_config(struct intel_encoder *encoder,
intel_psr_compute_config(intel_dp, pipe_config);
+ tgl_dc3co_exitline_compute_config(encoder, pipe_config);
+
intel_hdcp_transcoder_config(intel_connector,
pipe_config->cpu_transcoder);
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] Cc: Jani Nikula <jani.nikula@intel.com> Cc: Imre Deak <imre.deak@intel.com> Cc: Animesh Manna <animesh.manna@intel.com> Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com> --- drivers/gpu/drm/i915/display/intel_ddi.c | 7 ++ drivers/gpu/drm/i915/display/intel_display.c | 1 + .../drm/i915/display/intel_display_power.c | 100 ++++++++++++++++++ .../drm/i915/display/intel_display_power.h | 7 ++ .../drm/i915/display/intel_display_types.h | 1 + drivers/gpu/drm/i915/display/intel_dp.c | 2 + 6 files changed, 118 insertions(+)