[Intel-gfx] [PATCH v3 9/9] drm/i915/edp: enable eDP MSO during link training

Jani Nikula
2021-02-11T14:53:20Z

If the source and sink support MSO, enable it during link training.

v3: Adjust timings, refer to splitter

v2: Limit MSO to pipe A using ->pipe_mask

Cc: Nischal Varide <nischal.varide@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
drivers/gpu/drm/i915/display/intel_ddi.c | 37 ++++++++++++++++++++
drivers/gpu/drm/i915/display/intel_display.c | 13 +++++++
drivers/gpu/drm/i915/display/intel_dp.c | 34 ++++++++++++++++--
3 files changed, 82 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index c9098297b6ac..5a8d1abd208a 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -2167,6 +2167,34 @@ static void intel_ddi_mso_get_config(struct intel_encoder *encoder,
pipe_config->splitter.pixel_overlap = REG_FIELD_GET(OVERLAP_PIXELS_MASK, dss1);
}

+static void intel_ddi_mso_configure(const struct intel_crtc_state *crtc_state)
+{
+ struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+ struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+ enum pipe pipe = crtc->pipe;
+ u32 dss1 = 0;
+
+ if (!HAS_MSO(i915))
+ return;
+
+ if (crtc_state->splitter.enable) {
+ /* Splitter enable is supported for pipe A only. */
+ if (drm_WARN_ON(&i915->drm, pipe != PIPE_A))
+ return;
+
+ dss1 |= SPLITTER_ENABLE;
+ dss1 |= OVERLAP_PIXELS(crtc_state->splitter.pixel_overlap);
+ if (crtc_state->splitter.link_count == 2)
+ dss1 |= SPLITTER_CONFIGURATION_2_SEGMENT;
+ else
+ dss1 |= SPLITTER_CONFIGURATION_4_SEGMENT;
+ }
+
+ intel_de_rmw(i915, ICL_PIPE_DSS_CTL1(pipe),
+ SPLITTER_ENABLE | SPLITTER_CONFIGURATION_MASK |
+ OVERLAP_PIXELS_MASK, dss1);
+}
+
static void tgl_ddi_pre_enable_dp(struct intel_atomic_state *state,
struct intel_encoder *encoder,
const struct intel_crtc_state *crtc_state,
@@ -2260,6 +2288,11 @@ static void tgl_ddi_pre_enable_dp(struct intel_atomic_state *state,
*/
intel_ddi_power_up_lanes(encoder, crtc_state);

+ /*
+ * 7.g Program CoG/MSO configuration bits in DSS_CTL1 if selected.
+ */
+ intel_ddi_mso_configure(crtc_state);
+
/*
* 7.g Configure and enable DDI_BUF_CTL
* 7.h Wait for DDI_BUF_CTL DDI Idle Status = 0b (Not Idle), timeout
@@ -4143,6 +4176,10 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
goto err;

dig_port->hpd_pulse = intel_dp_hpd_pulse;
+
+ /* Splitter enable for eDP MSO is supported for pipe A only. */
+ if (dig_port->dp.mso_link_count)
+ encoder->pipe_mask = BIT(PIPE_A);
}

/* In theory we don't need the encoder->type check, but leave it just in
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 3059a07b8c36..06b7edbe1187 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -4917,6 +4917,19 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc,
pipe_config->pipe_src_w /= 2;
}

+ if (pipe_config->splitter.enable) {
+ int n = pipe_config->splitter.link_count;
+ int overlap = pipe_config->splitter.pixel_overlap;
+
+ pipe_mode->crtc_hdisplay = (pipe_mode->crtc_hdisplay - overlap) * n;
+ pipe_mode->crtc_hblank_start = (pipe_mode->crtc_hblank_start - overlap) * n;
+ pipe_mode->crtc_hblank_end = (pipe_mode->crtc_hblank_end - overlap) * n;
+ pipe_mode->crtc_hsync_start = (pipe_mode->crtc_hsync_start - overlap) * n;
+ pipe_mode->crtc_hsync_end = (pipe_mode->crtc_hsync_end - overlap) * n;
+ pipe_mode->crtc_htotal = (pipe_mode->crtc_htotal - overlap) * n;
+ pipe_mode->crtc_clock *= n;
+ }
+
intel_mode_from_crtc_timings(pipe_mode, pipe_mode);

if (INTEL_GEN(dev_priv) < 4) {
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 5d5b16f70ed2..8f39da994d14 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1745,6 +1745,10 @@ intel_dp_drrs_compute_config(struct intel_dp *intel_dp,
intel_connector->panel.downclock_mode->clock,
pipe_config->port_clock, &pipe_config->dp_m2_n2,
constant_n, pipe_config->fec_enable);
+
+ /* FIXME: abstract this better */
+ if (pipe_config->splitter.enable)
+ pipe_config->dp_m2_n2.gmch_m *= pipe_config->splitter.link_count;
}

int
@@ -1819,6 +1823,26 @@ intel_dp_compute_config(struct intel_encoder *encoder,
output_bpp = intel_dp_output_bpp(pipe_config->output_format,
pipe_config->pipe_bpp);

+ if (intel_dp->mso_link_count) {
+ int n = intel_dp->mso_link_count;
+ int overlap = intel_dp->mso_pixel_overlap;
+
+ pipe_config->splitter.enable = true;
+ pipe_config->splitter.link_count = n;
+ pipe_config->splitter.pixel_overlap = overlap;
+
+ drm_dbg_kms(&dev_priv->drm, "MSO link count %d, pixel overlap %d\n",
+ n, overlap);
+
+ adjusted_mode->crtc_hdisplay = adjusted_mode->crtc_hdisplay / n + overlap;
+ adjusted_mode->crtc_hblank_start = adjusted_mode->crtc_hblank_start / n + overlap;
+ adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_hblank_end / n + overlap;
+ adjusted_mode->crtc_hsync_start = adjusted_mode->crtc_hsync_start / n + overlap;
+ adjusted_mode->crtc_hsync_end = adjusted_mode->crtc_hsync_end / n + overlap;
+ adjusted_mode->crtc_htotal = adjusted_mode->crtc_htotal / n + overlap;
+ adjusted_mode->crtc_clock /= n;
+ }
+
intel_link_compute_m_n(output_bpp,
pipe_config->lane_count,
adjusted_mode->crtc_clock,
@@ -1826,6 +1850,10 @@ intel_dp_compute_config(struct intel_encoder *encoder,
&pipe_config->dp_m_n,
constant_n, pipe_config->fec_enable);

+ /* FIXME: abstract this better */
+ if (pipe_config->splitter.enable)
+ pipe_config->dp_m_n.gmch_m *= pipe_config->splitter.link_count;
+
if (!HAS_DDI(dev_priv))
intel_dp_set_clock(encoder, pipe_config);

@@ -3564,8 +3592,10 @@ static void intel_edp_mso_init(struct intel_dp *intel_dp)
if (mso) {
drm_dbg_kms(&i915->drm, "Sink MSO %ux%u configuration\n",
mso, drm_dp_max_lane_count(intel_dp->dpcd) / mso);
- drm_err(&i915->drm, "No source MSO support, disabling\n");
- mso = 0;
+ if (!HAS_MSO(i915)) {
+ drm_err(&i915->drm, "No source MSO support, disabling\n");
+ mso = 0;
+ }
}

intel_dp->mso_link_count = mso;
--
2.20.1