[PATCH v2 05/18] drm/i915: Reworkd DFP max bpc handling

[Ville Syrjala]

From: Ville Syrjälä <ville.syrj...@linux.intel.com>

Stash the downstream facing port max bpc away during
intel_dp_set_edid(). We'll soon need the EDID in there so
we can't figure this out so easily during .compute_config() anymore.

Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
 .../drm/i915/display/intel_display_types.h    |  5 +++++
 drivers/gpu/drm/i915/display/intel_dp.c       | 22 ++++++++++++++-----
 2 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h 
b/drivers/gpu/drm/i915/display/intel_display_types.h
index 6f3a3dde99c8..8699c001969d 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1379,6 +1379,11 @@ struct intel_dp {
        /* Displayport compliance testing */
        struct intel_dp_compliance compliance;
 
+       /* Downstream facing port caps */
+       struct {
+               u8 max_bpc;
+       } dfp;
+
        /* Display stream compression testing */
        bool force_dsc_en;
 
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c 
b/drivers/gpu/drm/i915/display/intel_dp.c
index 60bf01a8b4ad..2c8e82d97a34 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1973,13 +1973,12 @@ static int intel_dp_compute_bpp(struct intel_dp 
*intel_dp,
 {
        struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
        struct intel_connector *intel_connector = intel_dp->attached_connector;
-       int bpp, bpc;
+       int bpp;
 
        bpp = pipe_config->pipe_bpp;
-       bpc = drm_dp_downstream_max_bpc(intel_dp->dpcd, 
intel_dp->downstream_ports);
 
-       if (bpc > 0)
-               bpp = min(bpp, 3*bpc);
+       if (intel_dp->dfp.max_bpc)
+               bpp = min(bpp, 3 * intel_dp->dfp.max_bpc);
 
        if (intel_dp_is_edp(intel_dp)) {
                /* Get bpp from vbt only for panels that dont have bpp in edid 
*/
@@ -6062,12 +6061,21 @@ intel_dp_get_edid(struct intel_dp *intel_dp)
 static void
 intel_dp_set_edid(struct intel_dp *intel_dp)
 {
-       struct intel_connector *intel_connector = intel_dp->attached_connector;
+       struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+       struct intel_connector *connector = intel_dp->attached_connector;
        struct edid *edid;
 
        intel_dp_unset_edid(intel_dp);
        edid = intel_dp_get_edid(intel_dp);
-       intel_connector->detect_edid = edid;
+       connector->detect_edid = edid;
+
+       intel_dp->dfp.max_bpc =
+               drm_dp_downstream_max_bpc(intel_dp->dpcd,
+                                         intel_dp->downstream_ports);
+
+       drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] DFP max bpc %d\n",
+                   connector->base.base.id, connector->base.name,
+                   intel_dp->dfp.max_bpc);
 
        if (edid && edid->input & DRM_EDID_INPUT_DIGITAL) {
                intel_dp->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
@@ -6090,6 +6098,8 @@ intel_dp_unset_edid(struct intel_dp *intel_dp)
        intel_dp->has_hdmi_sink = false;
        intel_dp->has_audio = false;
        intel_dp->edid_quirks = 0;
+
+       intel_dp->dfp.max_bpc = 0;
 }
 
 static int
-- 
2.26.2

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