[igt-dev] [PATCH i-g-t v7 2/5] lib/igt_pm: Add lib func to get lpsp capability

Anshuman Gupta
2020-05-07T10:31:55Z

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

v2:
- changed the lib function prefix igt_output_is_lpsp_capable
to i915_output_is_lpsp_capable. [Martin]
v3:
- early return for the connector which doesn't support
lpsp on any platform.
v4:
- debugfs entry changed from i915_lpsp_info to i915_lpsp_capability.
v5:
- return lpsp capability false if i915_lpsp_capability debugfs is not
present. [Animesh]

Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
---
lib/igt_pm.c | 29 +++++++++++++++++++++++++++++
lib/igt_pm.h | 1 +
2 files changed, 30 insertions(+)

diff --git a/lib/igt_pm.c b/lib/igt_pm.c
index 9d441e1b..b409ec46 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 +828,31 @@ bool igt_pm_pc8_plus_residencies_enabled(int msr_fd)

return true;
}
+
+/**
+ * i915_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 i915_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_capability",
+ buf, sizeof(buf));
+
+ /* if i915_lpsp_capability not present return the capability as false */
+ if (len < 0)
+ return false;
+
+ close(fd);
+
+ return strstr(buf, "LPSP: capable");
+}
diff --git a/lib/igt_pm.h b/lib/igt_pm.h
index 5e438452..162d3ca3 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 i915_output_is_lpsp_capable(int drm_fd, igt_output_t *output);

#endif /* IGT_PM_H */
--
2.26.0