drm/i915: hw state readout&check support for cpu_transcoder

This allows us to drop a bunch of ugly hacks and finally implement
what

commit cc464b2a17c59adedbdc02cc54341d630354edc3
Author: Paulo Zanoni <paulo.r.zanoni@intel.com>
Date:   Fri Jan 25 16:59:16 2013 -0200

    drm/i915: set TRANSCODER_EDP even earlier

tried to achieve, but that was reverted again in

commit bba2181c49f1dddf8b592804a1b53cc1a3cf408a
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Fri Mar 22 10:53:40 2013 +0100

    Revert "drm/i915: set TRANSCODER_EDP even earlier"

Now we should always have a consistent cpu_transcoder in the
pipe_config.

v2: Fix up the code as spotted by Paulo:
- read the register for real
- assign the right pipes
- break out if the hw state doesn't make sense

v3: Shut up gcc.

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 37 insertions, 57 deletions

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 1fdd3b0b7040..9649df806079 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1291,9 +1291,13 @@ static bool intel_ddi_compute_config(struct intel_encoder *encoder,
                                      struct intel_crtc_config *pipe_config)
 {
         int type = encoder->type;
+        int port = intel_ddi_get_encoder_port(encoder);
 
         WARN(type == INTEL_OUTPUT_UNKNOWN, "compute_config() on unknown output!\n");
 
+        if (port == PORT_A)
+                pipe_config->cpu_transcoder = TRANSCODER_EDP;
+
         if (type == INTEL_OUTPUT_HDMI)
                 return intel_hdmi_compute_config(encoder, pipe_config);
         else
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2a9d0671f8c3..cb2437d1e0ea 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3469,12 +3469,6 @@ static void ironlake_crtc_off(struct drm_crtc *crtc)
 
 static void haswell_crtc_off(struct drm_crtc *crtc)
 {
-        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-
-        /* Stop saying we're using TRANSCODER_EDP because some other CRTC might
-         * start using it. */
-        intel_crtc->config.cpu_transcoder = (enum transcoder) intel_crtc->pipe;
-
         intel_ddi_put_crtc_pll(crtc);
 }
 
@@ -4925,6 +4919,8 @@ static bool i9xx_get_pipe_config(struct intel_crtc *crtc,
         struct drm_i915_private *dev_priv = dev->dev_private;
         uint32_t tmp;
 
+        pipe_config->cpu_transcoder = crtc->pipe;
+
         tmp = I915_READ(PIPECONF(crtc->pipe));
         if (!(tmp & PIPECONF_ENABLE))
                 return false;
@@ -5647,8 +5643,6 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
         WARN(!(HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev)),
              "Unexpected PCH type %d\n", INTEL_PCH_TYPE(dev));
 
-        intel_crtc->config.cpu_transcoder = pipe;
-
         ok = ironlake_compute_clocks(crtc, adjusted_mode, &clock,
                                      &has_reduced_clock, &reduced_clock);
         if (!ok) {
@@ -5784,6 +5778,8 @@ static bool ironlake_get_pipe_config(struct intel_crtc *crtc,
         struct drm_i915_private *dev_priv = dev->dev_private;
         uint32_t tmp;
 
+        pipe_config->cpu_transcoder = crtc->pipe;
+
         tmp = I915_READ(PIPECONF(crtc->pipe));
         if (!(tmp & PIPECONF_ENABLE))
                 return false;
@@ -5860,11 +5856,6 @@ static int haswell_crtc_mode_set(struct drm_crtc *crtc,
                 num_connectors++;
         }
 
-        if (is_cpu_edp)
-                intel_crtc->config.cpu_transcoder = TRANSCODER_EDP;
-        else
-                intel_crtc->config.cpu_transcoder = pipe;
-
         /* We are not sure yet this won't happen. */
         WARN(!HAS_PCH_LPT(dev), "Unexpected PCH type %d\n",
              INTEL_PCH_TYPE(dev));
@@ -5918,15 +5909,37 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
 {
         struct drm_device *dev = crtc->base.dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
-        enum transcoder cpu_transcoder = crtc->config.cpu_transcoder;
         enum intel_display_power_domain pfit_domain;
         uint32_t tmp;
 
+        pipe_config->cpu_transcoder = crtc->pipe;
+        tmp = I915_READ(TRANS_DDI_FUNC_CTL(TRANSCODER_EDP));
+        if (tmp & TRANS_DDI_FUNC_ENABLE) {
+                enum pipe trans_edp_pipe;
+                switch (tmp & TRANS_DDI_EDP_INPUT_MASK) {
+                default:
+                        WARN(1, "unknown pipe linked to edp transcoder\n");
+                case TRANS_DDI_EDP_INPUT_A_ONOFF:
+                case TRANS_DDI_EDP_INPUT_A_ON:
+                        trans_edp_pipe = PIPE_A;
+                        break;
+                case TRANS_DDI_EDP_INPUT_B_ONOFF:
+                        trans_edp_pipe = PIPE_B;
+                        break;
+                case TRANS_DDI_EDP_INPUT_C_ONOFF:
+                        trans_edp_pipe = PIPE_C;
+                        break;
+                }
+
+                if (trans_edp_pipe == crtc->pipe)
+                        pipe_config->cpu_transcoder = TRANSCODER_EDP;
+        }
+
         if (!intel_display_power_enabled(dev,
-                        POWER_DOMAIN_TRANSCODER(cpu_transcoder)))
+                        POWER_DOMAIN_TRANSCODER(pipe_config->cpu_transcoder)))
                 return false;
 
-        tmp = I915_READ(PIPECONF(cpu_transcoder));
+        tmp = I915_READ(PIPECONF(pipe_config->cpu_transcoder));
         if (!(tmp & PIPECONF_ENABLE))
                 return false;
 
@@ -5935,7 +5948,7 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
          * DDI E. So just check whether this pipe is wired to DDI E and whether
          * the PCH transcoder is on.
          */
-        tmp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
+        tmp = I915_READ(TRANS_DDI_FUNC_CTL(pipe_config->cpu_transcoder));
         if ((tmp & TRANS_DDI_PORT_MASK) == TRANS_DDI_SELECT_PORT(PORT_E) &&
             I915_READ(LPT_TRANSCONF) & TRANS_ENABLE) {
                 pipe_config->has_pch_encoder = true;
@@ -7690,6 +7703,7 @@ intel_modeset_pipe_config(struct drm_crtc *crtc,
 
         drm_mode_copy(&pipe_config->adjusted_mode, mode);
         drm_mode_copy(&pipe_config->requested_mode, mode);
+        pipe_config->cpu_transcoder = to_intel_crtc(crtc)->pipe;
 
         plane_bpp = pipe_config_set_bpp(crtc, fb, pipe_config);
         if (plane_bpp < 0)
@@ -7940,6 +7954,8 @@ intel_pipe_config_compare(struct drm_device *dev,
                 return false; \
         }
 
+        PIPE_CONF_CHECK_I(cpu_transcoder);
+
         PIPE_CONF_CHECK_I(has_pch_encoder);
         PIPE_CONF_CHECK_I(fdi_lanes);
         PIPE_CONF_CHECK_I(fdi_m_n.gmch_m);
@@ -8091,7 +8107,6 @@ intel_modeset_check_state(struct drm_device *dev)
                      "crtc's computed enabled state doesn't match tracked enabled state "
                      "(expected %i, found %i)\n", enabled, crtc->base.enabled);
 
-                pipe_config.cpu_transcoder = crtc->config.cpu_transcoder;
                 active = dev_priv->display.get_pipe_config(crtc,
                                                            &pipe_config);
                 WARN(crtc->active != active,
@@ -8154,12 +8169,10 @@ static int __intel_set_mode(struct drm_crtc *crtc,
          * to set it here already despite that we pass it down the callchain.
          */
         if (modeset_pipes) {
-                enum transcoder tmp = to_intel_crtc(crtc)->config.cpu_transcoder;
                 crtc->mode = *mode;
                 /* mode_set/enable/disable functions rely on a correct pipe
                  * config. */
                 to_intel_crtc(crtc)->config = *pipe_config;
-                to_intel_crtc(crtc)->config.cpu_transcoder = tmp;
         }
 
         /* Only after disabling all output pipelines that will be changed can we
@@ -8570,7 +8583,6 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
         /* Swap pipes & planes for FBC on pre-965 */
         intel_crtc->pipe = pipe;
         intel_crtc->plane = pipe;
-        intel_crtc->config.cpu_transcoder = pipe;
         if (IS_MOBILE(dev) && IS_GEN3(dev)) {
                 DRM_DEBUG_KMS("swapping pipes & planes for FBC\n");
                 intel_crtc->plane = !pipe;
@@ -9436,50 +9448,14 @@ void intel_modeset_setup_hw_state(struct drm_device *dev,
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
         enum pipe pipe;
-        u32 tmp;
         struct drm_plane *plane;
         struct intel_crtc *crtc;
         struct intel_encoder *encoder;
         struct intel_connector *connector;
 
-        if (HAS_DDI(dev)) {
-                tmp = I915_READ(TRANS_DDI_FUNC_CTL(TRANSCODER_EDP));
-
-                if (tmp & TRANS_DDI_FUNC_ENABLE) {
-                        switch (tmp & TRANS_DDI_EDP_INPUT_MASK) {
-                        case TRANS_DDI_EDP_INPUT_A_ON:
-                        case TRANS_DDI_EDP_INPUT_A_ONOFF:
-                                pipe = PIPE_A;
-                                break;
-                        case TRANS_DDI_EDP_INPUT_B_ONOFF:
-                                pipe = PIPE_B;
-                                break;
-                        case TRANS_DDI_EDP_INPUT_C_ONOFF:
-                                pipe = PIPE_C;
-                                break;
-                        default:
-                                /* A bogus value has been programmed, disable
-                                 * the transcoder */
-                                WARN(1, "Bogus eDP source %08x\n", tmp);
-                                intel_ddi_disable_transcoder_func(dev_priv,
-                                                TRANSCODER_EDP);
-                                goto setup_pipes;
-                        }
-
-                        crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
-                        crtc->config.cpu_transcoder = TRANSCODER_EDP;
-
-                        DRM_DEBUG_KMS("Pipe %c using transcoder EDP\n",
-                                      pipe_name(pipe));
-                }
-        }
-
-setup_pipes:
         list_for_each_entry(crtc, &dev->mode_config.crtc_list,
                             base.head) {
-                enum transcoder tmp = crtc->config.cpu_transcoder;
                 memset(&crtc->config, 0, sizeof(crtc->config));
-                crtc->config.cpu_transcoder = tmp;
 
                 crtc->active = dev_priv->display.get_pipe_config(crtc,
                                                                  &crtc->config);