drm/i915: Add i915_lpsp_capability debugfs

New i915_pm_lpsp igt solution approach relies on connector specific
debugfs attribute i915_lpsp_capability, it exposes whether an output is
capable of driving lpsp.

v2:
- CI fixup.
v3:
- register i915_lpsp_info only for supported connector. [Jani]
- use intel_display_power_well_is_enabled() instead of looking
  inside power_well count. [Jani]
- fixes the lpsp capable conditional logic. [Jani]
- combined the lpsp capable and enable info. [Jani]
v4:
- Separate out connector based debugfs i915_lpsp_capability
  lpsp enable status would be exposes by different entry. [Animesh]
v5:
- Add Platform Gen condition to add i915_lpsp_capability
  and some cosmetic nitpick changes. [Animesh]

Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200415170555.15531-3-anshuman.gupta@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index ab20b7ea26f7fa270be0a05335baae063f53a816..69be0e05e97fc015ad147c0217ebcb41231ebbdb 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -1997,6 +1997,48 @@ static int i915_hdcp_sink_capability_show(struct seq_file *m, void *data)
 }
 DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
 
+#define LPSP_CAPABLE(COND) (COND ? seq_puts(m, "LPSP: capable\n") : \
+                               seq_puts(m, "LPSP: incapable\n"))
+
+static int i915_lpsp_capability_show(struct seq_file *m, void *data)
+{
+       struct drm_connector *connector = m->private;
+       struct intel_encoder *encoder =
+                       intel_attached_encoder(to_intel_connector(connector));
+       struct drm_i915_private *i915 = to_i915(connector->dev);
+
+       if (connector->status != connector_status_connected)
+               return -ENODEV;
+
+       switch (INTEL_GEN(i915)) {
+       case 12:
+               /*
+                * Actually TGL can drive LPSP on port till DDI_C
+                * but there is no physical connected DDI_C on TGL sku's,
+                * even driver is not initilizing DDI_C port for gen12.
+                */
+               LPSP_CAPABLE(encoder->port <= PORT_B);
+               break;
+       case 11:
+               LPSP_CAPABLE(connector->connector_type == DRM_MODE_CONNECTOR_DSI ||
+                            connector->connector_type == DRM_MODE_CONNECTOR_eDP);
+               break;
+       case 10:
+       case 9:
+               LPSP_CAPABLE(encoder->port == PORT_A &&
+                            (connector->connector_type == DRM_MODE_CONNECTOR_DSI ||
+                            connector->connector_type == DRM_MODE_CONNECTOR_eDP  ||
+                            connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort));
+               break;
+       default:
+               if (IS_HASWELL(i915) || IS_BROADWELL(i915))
+                       LPSP_CAPABLE(connector->connector_type == DRM_MODE_CONNECTOR_eDP);
+       }
+
+       return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(i915_lpsp_capability);
+
 static int i915_dsc_fec_support_show(struct seq_file *m, void *data)
 {
        struct drm_connector *connector = m->private;
@@ -2140,5 +2182,16 @@ int intel_connector_debugfs_add(struct drm_connector *connector)
                debugfs_create_file("i915_dsc_fec_support", S_IRUGO, root,
                                    connector, &i915_dsc_fec_support_fops);
 
+       /* Legacy panels doesn't lpsp on any platform */
+       if ((INTEL_GEN(dev_priv) >= 9 || IS_HASWELL(dev_priv) ||
+            IS_BROADWELL(dev_priv)) &&
+            (connector->connector_type == DRM_MODE_CONNECTOR_DSI ||
+            connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
+            connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
+            connector->connector_type == DRM_MODE_CONNECTOR_HDMIA ||
+            connector->connector_type == DRM_MODE_CONNECTOR_HDMIB))
+               debugfs_create_file("i915_lpsp_capability", 0444, root,
+                                   connector, &i915_lpsp_capability_fops);
+
        return 0;
 }