[igt-dev] [PATCH i-g-t 4/5] lib/igt_eld: allow retrieving an ELD entry per monitor name

[Simon Ser]

The previous function eld_has_igt (1) assumed the monitor name was always "IGT"
and (2) didn't provide a way to access the ELD data.

(1) is an issue for EDIDs that don't have "IGT" as the monitor name. This is
the case for the Chamelium default EDID, but this will also become an issue
with MST where each monitor will need to have a unique name (to be able to tell
them apart).

(2) makes it impossible to check ELD audio parameters.

This commit fixes both (1) and (2).

Signed-off-by: Simon Ser <simon.ser at intel.com>
---
 lib/igt_eld.c           | 12 +++++-------
 lib/igt_eld.h           |  2 +-
 tests/kms_hdmi_inject.c |  8 +++-----
 3 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/lib/igt_eld.c b/lib/igt_eld.c
index 732bbabd2d7c..53655c5e18f1 100644
--- a/lib/igt_eld.c
+++ b/lib/igt_eld.c
@@ -171,16 +171,14 @@ static bool eld_parse_entry(const char *path, struct eld_entry *eld)
 	return monitor_present;
 }
 
-/** eld_has_igt: check whether ALSA has detected the audio-capable IGT EDID by
- * parsing ELD entries */
-bool eld_has_igt(void)
+/** eld_from_monitor_name: retrieve an ELD entry from a monitor name */
+bool eld_from_monitor_name(struct eld_entry *eld, const char *monitor_name)
 {
 	DIR *dir;
 	struct dirent *dirent;
 	int i;
 	char card[64];
 	char path[PATH_MAX];
-	struct eld_entry eld;
 
 	for (i = 0; i < 8; i++) {
 		snprintf(card, sizeof(card), "/proc/asound/card%d", i);
@@ -195,16 +193,16 @@ bool eld_has_igt(void)
 
 			snprintf(path, sizeof(path), "%s/%s", card,
 				 dirent->d_name);
-			if (!eld_parse_entry(path, &eld)) {
+			if (!eld_parse_entry(path, eld)) {
 				continue;
 			}
 
-			if (!eld.valid) {
+			if (!eld->valid) {
 				igt_debug("Skipping invalid ELD: %s\n", path);
 				continue;
 			}
 
-			if (strcmp(eld.monitor_name, "IGT") == 0) {
+			if (strcmp(eld->monitor_name, monitor_name) == 0) {
 				closedir(dir);
 				return true;
 			}
diff --git a/lib/igt_eld.h b/lib/igt_eld.h
index e16187884d4b..1f34f784749b 100644
--- a/lib/igt_eld.h
+++ b/lib/igt_eld.h
@@ -49,6 +49,6 @@ struct eld_entry {
 	struct eld_sad sads[ELD_SADS_CAP];
 };
 
-bool eld_has_igt(void);
+bool eld_from_monitor_name(struct eld_entry *eld, const char *monitor_name);
 
 #endif
diff --git a/tests/kms_hdmi_inject.c b/tests/kms_hdmi_inject.c
index eba25046cead..31ddda731d7b 100644
--- a/tests/kms_hdmi_inject.c
+++ b/tests/kms_hdmi_inject.c
@@ -146,6 +146,7 @@ hdmi_inject_audio(int drm_fd, drmModeConnector *connector)
 	int fb_id, cid, ret, crtc_mask = -1;
 	struct igt_fb fb;
 	struct kmstest_connector_config config;
+	struct eld_entry eld;
 
 	kmstest_edid_add_audio(igt_kms_get_base_edid(), EDID_LENGTH, &edid,
 			       &length);
@@ -178,11 +179,8 @@ hdmi_inject_audio(int drm_fd, drmModeConnector *connector)
 
 	igt_assert(ret == 0);
 
-	/*
-	 * Test if we have /proc/asound/HDMI/eld#0.0 and is its contents are
-	 * valid.
-	 */
-	igt_assert(eld_has_igt());
+	/* Check whether ALSA has properly detected the audio-capable EDID */
+	igt_assert(eld_from_monitor_name(&eld, "IGT"));
 
 	igt_remove_fb(drm_fd, &fb);
 
-- 
2.21.0