[igt-dev] [PATCH i-g-t v2 1/5] lib/igt_pm: Add lib func to get lpsp capability

Anshuman Gupta
2020-03-23T06:44:55Z

This lib function evaluate the lpsp capability from
the connector specific debugfs attribute i915_lpsp_info.

Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
---
lib/igt_pm.c | 27 +++++++++++++++++++++++++++
lib/igt_pm.h | 1 +
2 files changed, 28 insertions(+)

diff --git a/lib/igt_pm.c b/lib/igt_pm.c
index 9d441e1b..7a6cab7c 100644
--- a/lib/igt_pm.c
+++ b/lib/igt_pm.c
@@ -37,6 +37,7 @@
#include <dirent.h>

#include "drmtest.h"
+#include "igt_kms.h"
#include "igt_pm.h"
#include "igt_aux.h"
#include "igt_sysfs.h"
@@ -827,3 +828,29 @@ bool igt_pm_pc8_plus_residencies_enabled(int msr_fd)

return true;
}
+
+/**
+ * igt_output_is_lpsp_capable:
+ * @drm_fd: fd to drm device
+ * @output: igt output for which lpsp capability need to be evaluated
+ * Check lpsp capability for a given output.
+ *
+ * Returns:
+ * True if given output is lpsp capable otherwise false.
+ */
+bool igt_output_is_lpsp_capable(int drm_fd, igt_output_t *output)
+{
+ char buf[256];
+ int fd, len;
+
+ fd = igt_debugfs_connector_dir(drm_fd, output->name, O_RDONLY);
+ igt_require(fd >= 0);
+ len = igt_debugfs_simple_read(fd, "i915_lpsp_info", buf, sizeof(buf));
+
+ if (len < 0)
+ igt_assert_eq(len, -ENODEV);
+
+ close(fd);
+
+ return strstr(buf, "LPSP capable");
+}
diff --git a/lib/igt_pm.h b/lib/igt_pm.h
index 5e438452..076d8c27 100644
--- a/lib/igt_pm.h
+++ b/lib/igt_pm.h
@@ -53,5 +53,6 @@ enum igt_runtime_pm_status igt_get_runtime_pm_status(void);
bool igt_wait_for_pm_status(enum igt_runtime_pm_status status);
bool igt_pm_dmc_loaded(int debugfs);
bool igt_pm_pc8_plus_residencies_enabled(int msr_fd);
+bool igt_output_is_lpsp_capable(int drm_fd, igt_output_t *output);

#endif /* IGT_PM_H */
--
2.25.2