[Intel-gfx] [RESEND v2 2/2] drm/i915: Allow "max bpc" property to limit pipe_bpp

[Radhakrishna Sripada]

From: "Sripada, Radhakrishna" <radhakrishna.srip...@intel.com>

Use the newly added "max bpc" connector property to limit pipe bpp.

Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
Cc: Paulo Zanoni <paulo.r.zan...@intel.com>
Cc: Manasi Navare <manasi.d.nav...@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.srip...@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c 
b/drivers/gpu/drm/i915/intel_display.c
index 737de251d0f8..4a3359f19b82 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -10510,6 +10510,28 @@ connected_sink_compute_bpp(struct intel_connector 
*connector,
        }
 }
 
+static void
+connected_sink_max_bpp(struct intel_digital_connector_state *intel_conn_state,
+                            struct intel_crtc_state *pipe_config)
+{
+       switch (intel_conn_state->max_bpc) {
+       case 8:
+       case 9:
+               pipe_config->pipe_bpp = 8*3;
+               break;
+       case 10:
+       case 11:
+               pipe_config->pipe_bpp = 10*3;
+               break;
+       case 12:
+               pipe_config->pipe_bpp = 12*3;
+               break;
+       default:
+               break;
+       }
+       DRM_DEBUG_KMS("Limiting display bpp to %d\n", pipe_config->pipe_bpp);
+}
+
 static int
 compute_baseline_pipe_bpp(struct intel_crtc *crtc,
                          struct intel_crtc_state *pipe_config)
@@ -10518,6 +10540,7 @@ compute_baseline_pipe_bpp(struct intel_crtc *crtc,
        struct drm_atomic_state *state;
        struct drm_connector *connector;
        struct drm_connector_state *connector_state;
+       struct intel_digital_connector_state *intel_conn_state;
        int bpp, i;
 
        if ((IS_G4X(dev_priv) || IS_VALLEYVIEW(dev_priv) ||
@@ -10538,6 +10561,10 @@ compute_baseline_pipe_bpp(struct intel_crtc *crtc,
                if (connector_state->crtc != &crtc->base)
                        continue;
 
+               intel_conn_state = 
to_intel_digital_connector_state(connector_state);
+               if (intel_conn_state->max_bpc)
+                       connected_sink_max_bpp(intel_conn_state, pipe_config);
+
                connected_sink_compute_bpp(to_intel_connector(connector),
                                           pipe_config);
        }
-- 
2.9.3

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