[PATCH v4 05/13] drm/connector: Print connector colorspace in state debugfs

[Harry Wentland]

v3: Fix kerneldocs (kernel test robot)

v4: Avoid returning NULL from drm_get_colorspace_name

Signed-off-by: Harry Wentland <harry.wentland at amd.com>
Cc: Pekka Paalanen <ppaalanen at gmail.com>
Cc: Sebastian Wick <sebastian.wick at redhat.com>
Cc: Vitaly.Prosyak at amd.com
Cc: Uma Shankar <uma.shankar at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Joshua Ashton <joshua at froggi.es>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Simon Ser <contact at emersion.fr>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Melissa Wen <mwen at igalia.com>
Cc: dri-devel at lists.freedesktop.org
Cc: amd-gfx at lists.freedesktop.org
---
 drivers/gpu/drm/drm_atomic.c    |  1 +
 drivers/gpu/drm/drm_connector.c | 15 +++++++++++++++
 include/drm/drm_connector.h     |  1 +
 3 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index c0dc5858a723..d6d04c4ccfc0 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1071,6 +1071,7 @@ static void drm_atomic_connector_print_state(struct drm_printer *p,
 	drm_printf(p, "\tcrtc=%s\n", state->crtc ? state->crtc->name : "(null)");
 	drm_printf(p, "\tself_refresh_aware=%d\n", state->self_refresh_aware);
 	drm_printf(p, "\tmax_requested_bpc=%d\n", state->max_requested_bpc);
+	drm_printf(p, "\tcolorspace=%s\n", drm_get_colorspace_name(state->colorspace));
 
 	if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
 		if (state->writeback_job && state->writeback_job->fb)
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 8d24a5da4076..69480385eaf3 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -1048,6 +1048,21 @@ static const char * const colorspace_names[] = {
 	[DRM_MODE_COLORIMETRY_BT601_YCC] = "BT601_YCC",
 };
 
+/**
+ * drm_get_colorspace_name - return a string for color encoding
+ * @colorspace: color space to compute name of
+ *
+ * In contrast to the other drm_get_*_name functions this one here returns a
+ * const pointer and hence is threadsafe.
+ */
+const char *drm_get_colorspace_name(enum drm_colorspace colorspace)
+{
+	if (colorspace < ARRAY_SIZE(colorspace_names) && colorspace_names[colorspace])
+		return colorspace_names[colorspace];
+	else
+		return "(null)";
+}
+
 static const u32 hdmi_colorspaces =
 	BIT(DRM_MODE_COLORIMETRY_SMPTE_170M_YCC) |
 	BIT(DRM_MODE_COLORIMETRY_BT709_YCC) |
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 565311e194da..ae0b1ee5b99a 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1980,6 +1980,7 @@ void drm_connector_list_iter_end(struct drm_connector_list_iter *iter);
 
 bool drm_connector_has_possible_encoder(struct drm_connector *connector,
 					struct drm_encoder *encoder);
+const char *drm_get_colorspace_name(enum drm_colorspace colorspace);
 
 /**
  * drm_for_each_connector_iter - connector_list iterator macro
-- 
2.40.1