New i915_pm_lpsp igt solution approach relies on connector specific
debugfs attribute i915_lpsp_info, it exposes whether an output is
capable of driving lpsp and exposes lpsp enablement info.
v2:
- CI fixup.
Signed-off-by: Anshuman Gupta <anshuman.gupta@xxxxxxxxx>
---
.../drm/i915/display/intel_display_debugfs.c | 104 ++++++++++++++++++
1 file changed, 104 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index 424f4e52f783..eb9d88341d48 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -9,6 +9,7 @@
#include "i915_debugfs.h"
#include "intel_csr.h"
#include "intel_display_debugfs.h"
+#include "intel_display_power.h"
#include "intel_display_types.h"
#include "intel_dp.h"
#include "intel_fbc.h"
@@ -611,6 +612,95 @@ static void intel_hdcp_info(struct seq_file *m,
seq_puts(m, "\n");
}
+static bool intel_have_embedded_panel(struct drm_connector *connector)
+{
+ return connector->connector_type == DRM_MODE_CONNECTOR_DSI ||
+ connector->connector_type == DRM_MODE_CONNECTOR_eDP;
+}
+
+static bool intel_have_gen9_lpsp_panel(struct drm_connector *connector)
+{
+ return intel_have_embedded_panel(connector) ||
+ connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort;
+}
+
+static int
+intel_lpsp_power_well_enabled(struct drm_i915_private *dev_priv,
+ enum i915_power_well_id power_well_id)
+{
+ struct i915_power_domains *power_domains = &dev_priv->power_domains;
+ struct i915_power_well *power_well = NULL, *pw_itr;
+ bool is_enabled;
+
+ mutex_lock(&power_domains->lock);
+
+ for_each_power_well(dev_priv, pw_itr)
+ if (pw_itr->desc->id == power_well_id) {
+ power_well = pw_itr;
+ break;
+ }
+
+ if (drm_WARN_ON(&dev_priv->drm, !power_well)) {
+ mutex_unlock(&power_domains->lock);
+ /* Assume that BIOS has enabled the power well*/
+ return true;
+ }
+
+ is_enabled = !!power_well->count;
+ mutex_unlock(&power_domains->lock);
+
+ return is_enabled;
+}
+
+static void
+intel_lpsp_capable_info(struct seq_file *m, struct drm_connector *connector)
+{
+ struct intel_encoder *encoder =
+ intel_attached_encoder(to_intel_connector(connector));
+ struct drm_i915_private *dev_priv = to_i915(connector->dev);
+ bool lpsp_capable = false;
+
+ if (IS_TIGERLAKE(dev_priv) && encoder->port <= PORT_C) {
+ lpsp_capable = true;
+ } else if (INTEL_GEN(dev_priv) >= 11 && intel_have_embedded_panel(connector)) {
+ lpsp_capable = true;
+ } else if (INTEL_GEN(dev_priv) >= 9 && (encoder->port == PORT_A &&
+ intel_have_gen9_lpsp_panel(connector))) {
+ lpsp_capable = true;
+ } else if ((IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) &&
+ connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
+ lpsp_capable = true;
+ } else {
+ seq_puts(m, "LPSP not supported\n");
+ return;
+ }
+
+ lpsp_capable ? seq_puts(m, "LPSP capable\n") : seq_puts(m, "LPSP incapable\n");
+}
+
+static void
+intel_lpsp_enable_info(struct seq_file *m, struct drm_connector *connector)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->dev);
+ bool is_lpsp = false;
+
+ if (INTEL_GEN(dev_priv) >= 11) {
+ is_lpsp = !intel_lpsp_power_well_enabled(dev_priv,
+ ICL_DISP_PW_3);
+ } else if (INTEL_GEN(dev_priv) >= 9) {
+ is_lpsp = !intel_lpsp_power_well_enabled(dev_priv,
+ SKL_DISP_PW_2);
+ } else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
+ is_lpsp = !intel_lpsp_power_well_enabled(dev_priv,
+ HSW_DISP_PW_GLOBAL);
+ } else {
+ seq_puts(m, "LPSP not supported\n");
+ return;
+ }
+
+ is_lpsp ? seq_puts(m, "LPSP enabled\n") : seq_puts(m, "LPSP disabled\n");
+}
+
static void intel_dp_info(struct seq_file *m,
struct intel_connector *intel_connector)
{
@@ -1987,6 +2077,17 @@ static int i915_hdcp_sink_capability_show(struct seq_file *m, void *data)
}
DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
+static int i915_lpsp_info_show(struct seq_file *m, void *data)
+{
+ struct drm_connector *connector = m->private;
+
+ intel_lpsp_capable_info(m, connector);
+ intel_lpsp_enable_info(m, connector);
+
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(i915_lpsp_info);
+
static int i915_dsc_fec_support_show(struct seq_file *m, void *data)
{
struct drm_connector *connector = m->private;
@@ -2130,5 +2231,8 @@ 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);
+ debugfs_create_file("i915_lpsp_info", 0444, root,
+ connector, &i915_lpsp_info_fops);
+
return 0;
}
--
2.25.2
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