[PATCH i-g-t 02/10] lib/igt_kms: add function to force/read a target link rate/lane count
Kunal Joshi
kunal1.joshi at intel.com
Tue Jul 30 21:13:33 UTC 2024
[1] allows to force/read link rate/lane count for a particular
connector. add functions to retrieve and write data to newly
exposed interface
[1] https://patchwork.freedesktop.org/patch/594770/?series=133624&rev=3
Signed-off-by: Kunal Joshi <kunal1.joshi at intel.com>
---
lib/igt_kms.c | 176 ++++++++++++++++++++++++++++++++++++++++++++++++++
lib/igt_kms.h | 7 ++
2 files changed, 183 insertions(+)
diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index 64318ef7f..a21ab0bc8 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -6662,3 +6662,179 @@ int get_num_scalers(int drm_fd, enum pipe pipe)
return num_scalers;
}
+
+void read_link_rates(int drm_fd, uint64_t *link_rates, int *num_rates, igt_output_t *output)
+{
+ char buf[1024];
+ const char *delimiters = " []*";
+ int count = 0;
+ int dir, res, rate;
+ char *token;
+
+ igt_require_f(output->name, "Invalid output");
+ dir = igt_debugfs_connector_dir(drm_fd, output->name, O_DIRECTORY);
+ igt_assert_f(dir >= 0, "Failed to open debugfs dir for connector %s\n",
+ igt_output_name(output));
+ res = igt_debugfs_simple_read(dir, "i915_dp_force_link_rate",
+ buf, sizeof(buf));
+ close(dir);
+ igt_require_f(res > 0, "Couldn't read i915_dp_force_link_rate");
+ buf[strcspn(buf, "\n")] = 0;
+ token = strtok(buf, delimiters);
+
+ while (token != NULL && count < DP_MAX_LINK_RATE_COUNT) {
+ rate = atoi(token);
+ if (rate != 0)
+ link_rates[count++] = rate;
+ token = strtok(NULL, delimiters);
+ }
+ *num_rates = count;
+}
+
+static bool force_connector_lane_count(int drm_fd,
+ drmModeConnector *connector,
+ const char *value)
+{
+ return connector_attr_set_debugfs(drm_fd, connector,
+ "i915_dp_force_lane_count",
+ value, "auto");
+}
+
+/**
+ * kmstest_force_connector_lane_count:
+ * @fd: drm file descriptor
+ * @connector: connector
+ * @lane_count: lane count
+ *
+ * Force lane count on the specified connector
+ * and install exit handler for resetting
+ *
+ * Returns: True on success
+ */
+bool kmstest_force_connector_lane_count(int drm_fd, drmModeConnector *connector, int lane_count)
+{
+ char value[2];
+ drmModeConnector *temp;
+
+ if (!is_intel_device(drm_fd))
+ return false;
+
+ snprintf(value, sizeof(value), "%d", lane_count);
+ if (!force_connector_lane_count(drm_fd, connector, value))
+ return false;
+
+ dump_connector_attrs();
+ igt_install_exit_handler(reset_connectors_at_exit);
+
+ /*
+ * To allow callers to always use GetConnectorCurrent we need to force a
+ * redetection here.
+ */
+ temp = drmModeGetConnector(drm_fd, connector->connector_id);
+ drmModeFreeConnector(temp);
+
+ return true;
+}
+
+static bool force_connector_link_rate(int drm_fd,
+ drmModeConnector *connector,
+ const char *value)
+{
+ return connector_attr_set_debugfs(drm_fd, connector,
+ "i915_dp_force_link_rate",
+ value, "auto");
+}
+
+/**
+ * kmstest_force_connector_link_rate:
+ * @fd: drm file descriptor
+ * @connector: connector
+ * @link_rate: link rate
+ *
+ * Force link rate on the specified connector
+ * and install exit handler for resetting
+ *
+ * Returns: True on success
+ */
+bool kmstest_force_connector_link_rate(int drm_fd, drmModeConnector *connector, int link_rate)
+{
+ char value[8];
+ drmModeConnector *temp;
+
+ if (!is_intel_device(drm_fd))
+ return false;
+
+ snprintf(value, sizeof(value), "%d", link_rate);
+ if (!force_connector_link_rate(drm_fd, connector, value))
+ return false;
+
+ dump_connector_attrs();
+ igt_install_exit_handler(reset_connectors_at_exit);
+
+ /*
+ * To allow callers to always use GetConnectorCurrent we need to force a
+ * redetection here.
+ */
+ temp = drmModeGetConnector(drm_fd, connector->connector_id);
+ drmModeFreeConnector(temp);
+
+ return true;
+}
+
+/**
+ * igt_get_dp_link_rate_set_for_output:
+ * @drm_fd: A drm file descriptor
+ * @output: Target output
+ *
+ * Returns: Link rate set for the output.
+ */
+enum dp_link_rate igt_get_dp_link_rate_set_for_output(int drm_fd, igt_output_t *output)
+{
+ char buf[512];
+ int dir, res;
+ int link_rate = DP_LINK_RATE_2000000;
+
+ igt_require_f(output->name, "Invalid output");
+ dir = igt_debugfs_connector_dir(drm_fd, output->name, O_RDONLY);
+ igt_assert_f(dir >= 0, "Failed to open debugfs dir for connector %s\n",
+ igt_output_name(output));
+ res = igt_debugfs_simple_read(dir, "i915_dp_force_link_rate", buf, sizeof(buf));
+ close(dir);
+ igt_require(res > 0);
+
+ if (strstr(buf, "[auto]"))
+ igt_assert(sscanf(strstr(buf, "*") - 6, "%d", &link_rate) == 1);
+ else
+ igt_assert(sscanf(strstr(buf, "[") + 1, "%d", &link_rate) == 1);
+
+ return link_rate;
+}
+
+/**
+ * igt_get_dp_lane_count_set_for_output:
+ * @drm_fd: A drm file descriptor
+ * @output: Target output
+ *
+ * Returns: Lane count set for the output.
+ */
+enum dp_lane_count igt_get_dp_lane_count_set_for_output(int drm_fd, igt_output_t *output)
+{
+ char buf[512];
+ int dir, res;
+ int lane_count = DP_LANE_COUNT_4;
+
+ igt_require_f(output->name, "Invalid output");
+ dir = igt_debugfs_connector_dir(drm_fd, output->name, O_RDONLY);
+ igt_assert_f(dir >= 0, "Failed to open debugfs dir for connector %s\n",
+ igt_output_name(output));
+ res = igt_debugfs_simple_read(dir, "i915_dp_force_lane_count", buf, sizeof(buf));
+ close(dir);
+ igt_require(res > 0);
+
+ if (strstr(buf, "[auto]"))
+ igt_assert(sscanf(strstr(buf, "*") - 2, "%d", &lane_count) == 1);
+ else
+ igt_assert(sscanf(strstr(buf, "[") + 1, "%d", &lane_count) == 1);
+
+ return lane_count;
+}
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index b44d13bcb..cbec2c1ab 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -288,6 +288,10 @@ bool kmstest_force_connector(int fd, drmModeConnector *connector,
bool kmstest_force_connector_bigjoiner(int drm_fd, drmModeConnector *connector);
void kmstest_force_edid(int drm_fd, drmModeConnector *connector,
const struct edid *edid);
+bool kmstest_force_connector_lane_count(int drm_fd, drmModeConnector *connector,
+ int lane_count);
+bool kmstest_force_connector_link_rate(int drm_fd, drmModeConnector *connector,
+ int link_rate);
bool kmstest_get_connector_default_mode(int drm_fd, drmModeConnector *connector,
drmModeModeInfo *mode);
@@ -1246,5 +1250,8 @@ bool intel_pipe_output_combo_valid(igt_display_t *display);
bool igt_check_output_is_dp_mst(igt_output_t *output);
int igt_get_dp_mst_connector_id(igt_output_t *output);
int get_num_scalers(int drm_fd, enum pipe pipe);
+void read_link_rates(int drm_fd, uint64_t *link_rates, int *num_rates, igt_output_t *output);
+enum dp_link_rate igt_get_dp_link_rate_set_for_output(int drm_fd, igt_output_t *output);
+enum dp_lane_count igt_get_dp_lane_count_set_for_output(int drm_fd, igt_output_t *output);
#endif /* __IGT_KMS_H__ */
--
2.43.0
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