drm/i915/dp: implement get_hw_state

Also add some macros to make the pipe computation a bit easier.

v2: I've mixed up the CPT and !CPT PORT_TO_PIPE macro variants ...

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 52 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index fd6a26a49b42..1e5f77a4a1e2 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4029,6 +4029,8 @@
 #define  PORT_TRANS_C_SEL_CPT   (2<<29)
 #define  PORT_TRANS_SEL_MASK    (3<<29)
 #define  PORT_TRANS_SEL_CPT(pipe)       ((pipe) << 29)
+#define  PORT_TO_PIPE(val)      (((val) & (1<<30)) >> 30)
+#define  PORT_TO_PIPE_CPT(val)  (((val) & PORT_TRANS_SEL_MASK) >> 29)
 
 #define TRANS_DP_CTL_A          0xe0300
 #define TRANS_DP_CTL_B          0xe1300
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index ff993a01d039..e3928b922825 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1250,6 +1250,54 @@ static void intel_dp_sink_dpms(struct intel_dp *intel_dp, int mode)
         }
 }
 
+static bool intel_dp_get_hw_state(struct intel_encoder *encoder,
+                                  enum pipe *pipe)
+{
+        struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+        struct drm_device *dev = encoder->base.dev;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        u32 tmp = I915_READ(intel_dp->output_reg);
+
+        if (!(tmp & DP_PORT_EN))
+                return false;
+
+        if (is_cpu_edp(intel_dp) && IS_GEN7(dev)) {
+                *pipe = PORT_TO_PIPE_CPT(tmp);
+        } else if (!HAS_PCH_CPT(dev) || is_cpu_edp(intel_dp)) {
+                *pipe = PORT_TO_PIPE(tmp);
+        } else {
+                u32 trans_sel;
+                u32 trans_dp;
+                int i;
+
+                switch (intel_dp->output_reg) {
+                case PCH_DP_B:
+                        trans_sel = TRANS_DP_PORT_SEL_B;
+                        break;
+                case PCH_DP_C:
+                        trans_sel = TRANS_DP_PORT_SEL_C;
+                        break;
+                case PCH_DP_D:
+                        trans_sel = TRANS_DP_PORT_SEL_D;
+                        break;
+                default:
+                        return true;
+                }
+
+                for_each_pipe(i) {
+                        trans_dp = I915_READ(TRANS_DP_CTL(i));
+                        if ((trans_dp & TRANS_DP_PORT_SEL_MASK) == trans_sel) {
+                                *pipe = i;
+                                return true;
+                        }
+                }
+        }
+
+        DRM_DEBUG_KMS("No pipe for dp port 0x%x found\n", intel_dp->output_reg);
+
+        return true;
+}
+
 static void intel_disable_dp(struct intel_encoder *encoder)
 {
         struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
@@ -2486,6 +2534,8 @@ intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
 
         intel_encoder->enable = intel_enable_dp;
         intel_encoder->disable = intel_disable_dp;
+        intel_encoder->get_hw_state = intel_dp_get_hw_state;
+        intel_connector->get_hw_state = intel_connector_get_hw_state;
 
         /* Set up the DDC bus. */
         switch (port) {