[PATCH i-g-t 1/2] lib/igt_psr: add helper to check of given psr mode can be enabled

[Kunal Joshi]

Check if given psr mode can be enabled by reading enable_psr
modparam

Signed-off-by: Kunal Joshi <kunal1.joshi at intel.com>
---
 lib/igt_psr.c | 23 +++++++++++++++++++++++
 lib/igt_psr.h |  1 +
 2 files changed, 24 insertions(+)

diff --git a/lib/igt_psr.c b/lib/igt_psr.c
index 663bac163..181499cf7 100644
--- a/lib/igt_psr.c
+++ b/lib/igt_psr.c
@@ -394,3 +394,26 @@ enum psr_mode psr_get_mode(int debugfs_fd)
 
 	return PSR_DISABLED;
 }
+
+/**
+ * is_psr_enable_possible
+ * Check if given psr mode can be enabled by reading enable_psr
+ * modparam
+ *
+ * Returns:
+ * True if given psr mode can be enabled, false otherwise.
+ */
+bool is_psr_enable_possible(int drm_fd, enum psr_mode mode)
+{
+	char *param_value;
+	int enable_psr;
+
+	param_value = __igt_params_get(drm_fd, "enable_psr");
+	if (!is_i915_device(drm_fd) && !param_value) {
+		igt_info("Failed to retrieve module parameter enable_psr\n");
+		return false;
+	}
+	enable_psr = atoi(param_value);
+	free(param_value);
+	return enable_psr > mode;
+}
diff --git a/lib/igt_psr.h b/lib/igt_psr.h
index 36711c0d4..82a4e8c5e 100644
--- a/lib/igt_psr.h
+++ b/lib/igt_psr.h
@@ -61,5 +61,6 @@ bool i915_psr2_selective_fetch_check(int drm_fd);
 
 bool i915_psr2_sel_fetch_to_psr1(int drm_fd);
 void i915_psr2_sel_fetch_restore(int drm_fd);
+bool is_psr_enable_possible(int drm_fd, enum psr_mode mode);
 
 #endif
-- 
2.25.1