drm/i915: don't init DP or HDMI when not supported by DDI port

There's no reason to init a DP connector if the encoder just supports
HDMI: we'll just waste hundreds and hundreds of cycles trying to do DP
AUX transactions to detect if there's something there. Same goes for a
DP connector that doesn't support HDMI, but I'm not sure these
actually exist.

v2: - Use bit fields
    - Remove useless identation level
    - Replace DRM_ERROR with DRM_DEBUG_KMS

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com> (v1)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 2eca286..b1485a0 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1059,6 +1059,10 @@ enum modeset_restore {
 
 struct ddi_vbt_port_info {
        uint8_t hdmi_level_shift;
+
+       uint8_t supports_dvi:1;
+       uint8_t supports_hdmi:1;
+       uint8_t supports_dp:1;
 };
 
 struct intel_vbt_data {

diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 7ce1c3c..0492b6f 100644 (file)
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -632,6 +632,10 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
        is_hdmi = is_dvi && (child->common.device_type & (1 << 11)) == 0;
        is_edp = is_dp && (child->common.device_type & (1 << 12));
 
+       info->supports_dvi = is_dvi;
+       info->supports_hdmi = is_hdmi;
+       info->supports_dp = is_dp;
+
        DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n",
                      port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt);
 
@@ -792,8 +796,15 @@ init_vbt_defaults(struct drm_i915_private *dev_priv)
        DRM_DEBUG_KMS("Set default to SSC at %dMHz\n", dev_priv->vbt.lvds_ssc_freq);
 
        for (port = PORT_A; port < I915_MAX_PORTS; port++) {
+               struct ddi_vbt_port_info *info =
+                       &dev_priv->vbt.ddi_port_info[port];
+
                /* Recommended BSpec default: 800mV 0dB. */
-               dev_priv->vbt.ddi_port_info[port].hdmi_level_shift = 6;
+               info->hdmi_level_shift = 6;
+
+               info->supports_dvi = (port != PORT_A && port != PORT_E);
+               info->supports_hdmi = info->supports_dvi;
+               info->supports_dp = (port != PORT_E);
        }
 }
 

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 963245a..7e9fa53 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1356,6 +1356,17 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
        struct drm_encoder *encoder;
        struct intel_connector *hdmi_connector = NULL;
        struct intel_connector *dp_connector = NULL;
+       bool init_hdmi, init_dp;
+
+       init_hdmi = (dev_priv->vbt.ddi_port_info[port].supports_dvi ||
+                    dev_priv->vbt.ddi_port_info[port].supports_hdmi);
+       init_dp = dev_priv->vbt.ddi_port_info[port].supports_dp;
+       if (!init_dp && !init_hdmi) {
+               DRM_DEBUG_KMS("VBT says port %c is not DVI/HDMI/DP compatible\n",
+                             port_name(port));
+               init_hdmi = true;
+               init_dp = true;
+       }
 
        intel_dig_port = kzalloc(sizeof(*intel_dig_port), GFP_KERNEL);
        if (!intel_dig_port)
@@ -1393,19 +1404,20 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
        intel_encoder->cloneable = false;
        intel_encoder->hot_plug = intel_ddi_hot_plug;
 
-       if (!intel_dp_init_connector(intel_dig_port, dp_connector)) {
+       if (init_dp && !intel_dp_init_connector(intel_dig_port, dp_connector)) {
                drm_encoder_cleanup(encoder);
                kfree(intel_dig_port);
                kfree(dp_connector);
                return;
        }
 
-       if (intel_encoder->type != INTEL_OUTPUT_EDP) {
+       /* In theory we don't need the encoder->type check, but leave it just in
+        * case we have some really bad VBTs... */
+       if (intel_encoder->type != INTEL_OUTPUT_EDP && init_hdmi) {
                hdmi_connector = kzalloc(sizeof(*hdmi_connector),
                                         GFP_KERNEL);
-               if (!hdmi_connector) {
+               if (!hdmi_connector)
                        return;
-               }
 
                intel_dig_port->hdmi.hdmi_reg = DDI_BUF_CTL(port);
                intel_hdmi_init_connector(intel_dig_port, hdmi_connector);