[PATCH v4 07/15] drm/i915/display: add platform member to struct intel_display

[Jani Nikula]

Facilitate using display->platform.haswell and
display->platform.haswell_ult etc. for identifying platforms and
subplatforms.

Merge the platform and subplatform bitmaps together, and check that
there's no overlap.

v4:
- Lower case, s/is/platform/

v3:
- Fix sanity check on display->is after merging subplatform members

v2:
- Use bitmap ops
- Add some sanity checks with warnings

Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 .../gpu/drm/i915/display/intel_display_core.h |  3 ++
 .../drm/i915/display/intel_display_device.c   | 35 +++++++++++++++++--
 2 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_core.h b/drivers/gpu/drm/i915/display/intel_display_core.h
index 45697af25fa9..45b7c6900adc 100644
--- a/drivers/gpu/drm/i915/display/intel_display_core.h
+++ b/drivers/gpu/drm/i915/display/intel_display_core.h
@@ -284,6 +284,9 @@ struct intel_display {
 	/* drm device backpointer */
 	struct drm_device *drm;
 
+	/* Platform (and subplatform, if any) identification */
+	struct intel_display_platforms platform;
+
 	/* Display functions */
 	struct {
 		/* Top level crtc-ish functions */
diff --git a/drivers/gpu/drm/i915/display/intel_display_device.c b/drivers/gpu/drm/i915/display/intel_display_device.c
index 0e835f714bf5..c124df204166 100644
--- a/drivers/gpu/drm/i915/display/intel_display_device.c
+++ b/drivers/gpu/drm/i915/display/intel_display_device.c
@@ -1525,6 +1525,25 @@ static enum intel_step get_pre_gmdid_step(struct intel_display *display,
 	return step;
 }
 
+/* Size of the entire bitmap, not the number of platforms */
+static unsigned int display_platforms_num_bits(void)
+{
+	return sizeof(((struct intel_display_platforms *)0)->bitmap) * BITS_PER_BYTE;
+}
+
+/* Number of platform bits set */
+static unsigned int display_platforms_weight(const struct intel_display_platforms *p)
+{
+	return bitmap_weight(p->bitmap, display_platforms_num_bits());
+}
+
+/* Merge the subplatform information from src to dst */
+static void display_platforms_or(struct intel_display_platforms *dst,
+				 const struct intel_display_platforms *src)
+{
+	bitmap_or(dst->bitmap, dst->bitmap, src->bitmap, display_platforms_num_bits());
+}
+
 void intel_display_device_probe(struct drm_i915_private *i915)
 {
 	struct intel_display *display = &i915->display;
@@ -1564,13 +1583,25 @@ void intel_display_device_probe(struct drm_i915_private *i915)
 	       &DISPLAY_INFO(i915)->__runtime_defaults,
 	       sizeof(*DISPLAY_RUNTIME_INFO(i915)));
 
-	drm_WARN_ON(&i915->drm, !desc->platform || !desc->name);
+	drm_WARN_ON(&i915->drm, !desc->platform || !desc->name ||
+		    !display_platforms_weight(&desc->platforms));
 	DISPLAY_RUNTIME_INFO(i915)->platform = desc->platform;
 
+	display->platform = desc->platforms;
+
 	subdesc = find_subplatform_desc(pdev, desc);
 	if (subdesc) {
-		drm_WARN_ON(&i915->drm, !subdesc->subplatform || !subdesc->name);
+		drm_WARN_ON(&i915->drm, !subdesc->subplatform || !subdesc->name ||
+			    !display_platforms_weight(&subdesc->platforms));
 		DISPLAY_RUNTIME_INFO(i915)->subplatform = subdesc->subplatform;
+
+		display_platforms_or(&display->platform, &subdesc->platforms);
+
+		/* Ensure platform and subplatform are distinct */
+		drm_WARN_ON(&i915->drm,
+			    display_platforms_weight(&display->platform) !=
+			    display_platforms_weight(&desc->platforms) +
+			    display_platforms_weight(&subdesc->platforms));
 	}
 
 	if (ip_ver.ver || ip_ver.rel || ip_ver.step) {
-- 
2.39.5