[igt-dev] [PATCH i-g-t 5/5] tests/kms_tiled_display: Override the EDID to fake some tiles

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Pretend we have a tiled display if we don't actually have one.

We don't actually know whether the kernel will sync up the displays,
but let's assume it does.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 tests/kms_tiled_display.c | 127 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 124 insertions(+), 3 deletions(-)

diff --git a/tests/kms_tiled_display.c b/tests/kms_tiled_display.c
index 66b5944e0158..7a37e12b655d 100644
--- a/tests/kms_tiled_display.c
+++ b/tests/kms_tiled_display.c
@@ -40,6 +40,7 @@
 #include "poll.h"
 #include "drm_mode.h"
 #include "drm_fourcc.h"
+#include "igt_edid.h"
 
 IGT_TEST_DESCRIPTION("Test for genlocked CRTCs with tiled displays");
 
@@ -110,8 +111,8 @@ static void get_number_of_h_tiles(data_t *data)
 	for (int i = 0; !data->num_h_tiles && i < res->count_connectors; i++) {
 		drmModeConnectorPtr connector;
 
-		connector = drmModeGetConnectorCurrent(data->drm_fd,
-						       res->connectors[i]);
+		connector = drmModeGetConnector(data->drm_fd,
+						res->connectors[i]);
 		igt_assert(connector);
 
 		if (connector->connection == DRM_MODE_CONNECTED) {
@@ -386,6 +387,119 @@ static bool got_all_page_flips(data_t *data)
 	return true;
 }
 
+static void edid_fill_tile_block(struct edid_ext *ext,
+				 int tile, int num_tiles,
+				 int hdisplay, int vdisplay)
+{
+	struct dispid_header *dispid;
+	void *ptr;
+
+	dispid = ptr = edid_ext_dispid(ext);
+
+	ptr = dispid_init(ptr);
+	ptr = dispid_block_tiled(ptr, num_tiles, 1,
+				 tile, 0,
+				 hdisplay, vdisplay,
+				 "IGT-TILES");
+	ptr = dispid_done(dispid, ptr);
+}
+
+static struct edid *
+edid_with_tile(const struct edid *old_edid,
+	       const drmModeModeInfo *mode,
+	       int tile, int num_tiles)
+{
+	struct edid *edid = malloc(edid_get_size(old_edid) + EDID_BLOCK_SIZE);
+
+	memcpy(edid, old_edid, edid_get_size(old_edid));
+	edid->extensions_len++;
+
+	edid_fill_tile_block((struct edid_ext *)&edid[edid->extensions_len],
+			     tile, num_tiles, mode->hdisplay, mode->vdisplay);
+
+	edid_update_checksum(edid);
+
+	return edid;
+}
+
+static void force_edid_with_tile(data_t *data,
+				 igt_output_t *output,
+				 const drmModeModeInfo *mode,
+				 int tile, int num_tiles)
+{
+	struct edid *edid;
+	drmModePropertyBlobPtr blob;
+	uint64_t blob_id;
+
+	kmstest_get_property(data->drm_fd, output->id,
+			     DRM_MODE_OBJECT_CONNECTOR, "EDID",
+			     NULL, &blob_id, NULL);
+
+	blob = drmModeGetPropertyBlob(data->drm_fd, blob_id);
+	edid = edid_with_tile(blob->data, mode, tile, num_tiles);
+	drmModeFreePropertyBlob(blob);
+
+	kmstest_force_edid(data->drm_fd, output->config.connector, edid);
+
+	free(edid);
+}
+
+static bool mode_equal(const drmModeModeInfo *a,
+		       const drmModeModeInfo *b)
+{
+	return a->hdisplay == b->hdisplay &&
+		a->hsync_start == b->hsync_start &&
+		a->hsync_end == b->hsync_end &&
+		a->htotal == b->htotal &&
+		a->vdisplay == b->vdisplay &&
+		a->vsync_start == b->vsync_start &&
+		a->vsync_end == b->vsync_end &&
+		a->vtotal == b->vtotal &&
+		a->clock == b->clock &&
+		a->flags == b->flags &&
+		a->hskew == b->hskew &&
+		a->vscan == b->vscan;
+}
+
+static void override_edid(data_t *data)
+{
+	drmModeModeInfo common_mode = {};
+	igt_output_t *outputs[8] = {};
+	igt_output_t *output;
+	int num_outputs = 0;
+	int num_tiles = 0;
+	drmModeResPtr res;
+
+	igt_require(data->display.n_pipes >= 2);
+
+	for_each_connected_output(&data->display, output) {
+		drmModeModeInfo *mode = igt_output_get_mode(output);
+
+		if (!common_mode.hdisplay)
+			common_mode = *mode;
+
+		if (mode_equal(&common_mode, mode)) {
+			outputs[num_outputs] = output;
+			if (++num_outputs >= ARRAY_SIZE(outputs))
+				break;
+		}
+	}
+
+	igt_require(num_outputs >= 2);
+
+	num_tiles = min(num_outputs, data->display.n_pipes);
+
+	/* disable everything so that we are sure to get a full modeset */
+	res = drmModeGetResources(data->drm_fd);
+	igt_require(res);
+	kmstest_unset_all_crtcs(data->drm_fd, res);
+	drmModeFreeResources(res);
+
+	for (int i = 0; i < num_tiles; i++)
+		force_edid_with_tile(data, outputs[i],
+				     &common_mode, i, num_tiles);
+}
+
 igt_main
 {
 	data_t data = {0};
@@ -408,7 +522,14 @@ igt_main
 		igt_require(data.commit == COMMIT_ATOMIC);
 
 		get_number_of_h_tiles(&data);
-		igt_debug("Number of Horizontal Tiles: %d\n", data.num_h_tiles);
+		igt_debug("Number of real horizontal tiles: %d\n", data.num_h_tiles);
+
+		if (data.num_h_tiles == 0) {
+			override_edid(&data);
+			get_number_of_h_tiles(&data);
+
+			igt_debug("Number of fake horizontal tiles: %d\n", data.num_h_tiles);
+		}
 		igt_require(data.num_h_tiles > 0);
 		data.conns = calloc(data.num_h_tiles, sizeof(data_connector_t));
 	}
-- 
2.24.1