drm/i915/icl: Get HW state for DSI encoder

This patch read out the current hw state for DSI and
return true if encoder is active.

v2 by Jani:
 - Squash connector get hw state hook here
 - Squash encode get hw state fix here

v3 by Jani:
 - Add encoder->get_power_domains() (Imre)

v4 by Jani:
 - Make encoder->get_power_domains() sensible... (Imre)

v5 by Jani:
 - Power domains are bit positions, not bits (Stan, Imre)

Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Madhav Chauhan <madhav.chauhan@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/ec6da32a55b9fb045527f14e41ed3dce86d46a97.1543500286.git.jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c
index fba68e1..12e907b 100644 (file)
--- a/drivers/gpu/drm/i915/icl_dsi.c
+++ b/drivers/gpu/drm/i915/icl_dsi.c
@@ -1074,6 +1074,62 @@ static void gen11_dsi_get_config(struct intel_encoder *encoder,
        pipe_config->output_types |= BIT(INTEL_OUTPUT_DSI);
 }
 
+static u64 gen11_dsi_get_power_domains(struct intel_encoder *encoder,
+                                      struct intel_crtc_state *crtc_state)
+{
+       struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+       u64 domains = 0;
+       enum port port;
+
+       for_each_dsi_port(port, intel_dsi->ports)
+               if (port == PORT_A)
+                       domains |= BIT_ULL(POWER_DOMAIN_PORT_DDI_A_IO);
+               else
+                       domains |= BIT_ULL(POWER_DOMAIN_PORT_DDI_B_IO);
+
+       return domains;
+}
+
+static bool gen11_dsi_get_hw_state(struct intel_encoder *encoder,
+                                  enum pipe *pipe)
+{
+       struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+       struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+       u32 tmp;
+       enum port port;
+       enum transcoder dsi_trans;
+       bool ret = false;
+
+       if (!intel_display_power_get_if_enabled(dev_priv,
+                                               encoder->power_domain))
+               return false;
+
+       for_each_dsi_port(port, intel_dsi->ports) {
+               dsi_trans = dsi_port_to_transcoder(port);
+               tmp = I915_READ(TRANS_DDI_FUNC_CTL(dsi_trans));
+               switch (tmp & TRANS_DDI_EDP_INPUT_MASK) {
+               case TRANS_DDI_EDP_INPUT_A_ON:
+                       *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:
+                       DRM_ERROR("Invalid PIPE input\n");
+                       goto out;
+               }
+
+               tmp = I915_READ(PIPECONF(dsi_trans));
+               ret = tmp & PIPECONF_ENABLE;
+       }
+out:
+       intel_display_power_put(dev_priv, encoder->power_domain);
+       return ret;
+}
+
 static void gen11_dsi_encoder_destroy(struct drm_encoder *encoder)
 {
        intel_encoder_destroy(encoder);
@@ -1188,10 +1244,12 @@ void icl_dsi_init(struct drm_i915_private *dev_priv)
        encoder->disable = gen11_dsi_disable;
        encoder->port = port;
        encoder->get_config = gen11_dsi_get_config;
+       encoder->get_hw_state = gen11_dsi_get_hw_state;
        encoder->type = INTEL_OUTPUT_DSI;
        encoder->cloneable = 0;
        encoder->crtc_mask = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C);
        encoder->power_domain = POWER_DOMAIN_PORT_DSI;
+       encoder->get_power_domains = gen11_dsi_get_power_domains;
 
        /* register DSI connector with DRM subsystem */
        drm_connector_init(dev, connector, &gen11_dsi_connector_funcs,
@@ -1200,6 +1258,7 @@ void icl_dsi_init(struct drm_i915_private *dev_priv)
        connector->display_info.subpixel_order = SubPixelHorizontalRGB;
        connector->interlace_allowed = false;
        connector->doublescan_allowed = false;
+       intel_connector->get_hw_state = intel_connector_get_hw_state;
 
        /* attach connector to encoder */
        intel_connector_attach_encoder(intel_connector, encoder);