From: Clint Taylor <clinton.a.tay...@intel.com>
Current 50ms max threshold timing for an EDID read is very close to the
actual time for a 2 block HDMI EDID read. Adjust the timings base on
connector type as DP reads are at 1 MBit and HDMI at 100K bit. If an LSPcon
is connected to device under test the -l option should be passed to update
the threshold timing to allow the LSPcon to read the EDID at the HDMI
timing. The -l option should be used when LSPcon is on the motherboard or
if a USB_C->HDMI converter is present
V2: Adjust timings based on connector type, EDID size, and Add an option to
specify if an LSPcon is present.
Cc: Daniel Vetter <daniel.vet...@intel.com>
Cc: Marta Lofstedt <marta.lofst...@intel.com>
Signed-off-by: Clint Taylor <clinton.a.tay...@intel.com>
---
tests/kms_sysfs_edid_timing.c | 76 +++++++++++++++++++++++++++++++++++--------
1 file changed, 62 insertions(+), 14 deletions(-)
diff --git a/tests/kms_sysfs_edid_timing.c b/tests/kms_sysfs_edid_timing.c
index 1201388..441dfee 100644
--- a/tests/kms_sysfs_edid_timing.c
+++ b/tests/kms_sysfs_edid_timing.c
@@ -26,21 +26,46 @@
#include <fcntl.h>
#include <sys/stat.h>
-#define THRESHOLD_PER_CONNECTOR 10
-#define THRESHOLD_TOTAL 50
-#define CHECK_TIMES 15
+#define THRESHOLD_FOR_EMPTY_CONNECTOR 10
+#define THRESHOLD_PER_EDID_BLOCK 5
+#define HDMI_THRESHOLD_MULTIPLIER 10
+#define CHECK_TIMES 10
IGT_TEST_DESCRIPTION("This check the time we take to read the content of all "
"the possible connectors. Without the edid -ENXIO patch "
"(http://permalink.gmane.org/gmane.comp.video.dri.devel/62083), "
- "we sometimes take a *really* long time. "
- "So let's just check for some reasonable timing here");
+ "we sometimes take a *really* long time. So let's check "
+ "an approximate time per edid block based on connector "
+ "type. The -l option adjusts DP timing to reflect HDMI
read "
+ "timings from LSPcon.");
+
+/* The -l option has been added to correctly handle timings when an LSPcon is
+ * present. This could be on the platform itself or in a USB_C->HDMI converter.
+ * With LSPCon EDID read timing will need to change from the 1 Mbit AUX
+ * bus speed to the 100 Kbit HDMI DDC bus speed
+ */
+bool lspcon_present;
+static int opt_handler(int opt, int opt_index, void *data)
+{
+ if (opt == 'l') {
+ lspcon_present = true;
+ igt_info("set LSPcon present on DP ports\n");
+ }
-igt_simple_main
+ return 0;
+}
+
+int main(int argc, char **argv)
{
DIR *dirp;
struct dirent *de;
+ lspcon_present = false;
+
+ igt_simple_init_parse_opts(&argc, argv, "l", NULL, NULL,
+ opt_handler, NULL);
+
+ igt_skip_on_simulation();
dirp = opendir("/sys/class/drm");
igt_assert(dirp != NULL);
@@ -49,17 +74,36 @@ igt_simple_main
struct igt_mean mean = {};
struct stat st;
char path[PATH_MAX];
- int i;
+ char edid_path[PATH_MAX];
+ char edid[512]; /* enough for 4 block edid */
+ unsigned long edid_size = 0;
+ int i, fd_edid;
+ unsigned int threshold = 0;
if (*de->d_name == '.')
continue;;
snprintf(path, sizeof(path), "/sys/class/drm/%s/status",
de->d_name);
+ snprintf(edid_path, sizeof(edid_path), "/sys/class/drm/%s/edid",
+ de->d_name);
if (stat(path, &st))
continue;
+ fd_edid = open(edid_path, O_RDONLY);
+ if (fd_edid == -1) {
+ igt_warn("Read Error EDID\n");
+ continue;
+ }
+
+ edid_size = read(fd_edid, edid, 512);
+ threshold = THRESHOLD_PER_EDID_BLOCK * (edid_size / 128);
+ if (lspcon_present || (edid_size > 128 &&
+ !strncmp(de->d_name, "card0-HDMI", 10))) {
+ threshold *= HDMI_THRESHOLD_MULTIPLIER;
+ }
+
igt_mean_init(&mean);
for (i = 0; i < CHECK_TIMES; i++) {
struct timespec ts = {};
@@ -76,22 +120,26 @@ igt_simple_main
}
igt_debug("%s: mean.max %.2fns, %.2fus, %.2fms, "
- "mean.avg %.2fns, %.2fus, %.2fms\n",
+ "mean.avg %.2fns, %.2fus, %.2fms, "
+ "edid_size %lu, threshold %d\n",
de->d_name,
mean.max, mean.max / 1e3, mean.max / 1e6,
- mean.mean, mean.mean / 1e3, mean.mean / 1e6);
+ mean.mean, mean.mean / 1e3, mean.mean / 1e6,
+ edid_size, threshold);
- if (mean.max > (THRESHOLD_PER_CONNECTOR * 1e6)) {
+ if (edid_size == 0 &&
+ (mean.max > (THRESHOLD_FOR_EMPTY_CONNECTOR * 1e6))) {
igt_warn("%s: probe time exceed 10ms, "
"max=%.2fms, avg=%.2fms\n", de->d_name,
mean.max / 1e6, mean.mean / 1e6);
}
- igt_assert_f(mean.mean < (THRESHOLD_TOTAL * 1e6),
- "%s: average probe time exceeded 50ms, "
- "max=%.2fms, avg=%.2fms\n", de->d_name,
+ if (edid_size > 0)
+ igt_assert_f(mean.mean < (threshold * 1e6),
+ "%s: average probe time exceeded %dms, "
+ "max=%.2fms, avg=%.2fms\n", de->d_name, threshold,
mean.max / 1e6, mean.mean / 1e6);
}
closedir(dirp);
-
+ igt_exit();
}
--
1.9.1
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