[igt-dev] [PATCH i-g-t 1/2] tests/kms_frontbuffer_tracking: Add support for toggling edp psr through debugfs, v3.

[Maarten Lankhorst <maarten.lankhorst@linux.intel.com>]

It's harmful to write to enable_psr at runtime, and the patch that allows
us to change i915_edp_psr_debug with the panel running will require us
to abandon the module parameter. Hence the userspace change needs to be
put in IGT first before we can change it at kernel time.

Toggling it to debugfs will mean we can skip a modeset when changing our
feature set.

Changes since v1:
- Rebase with the previous patches dropped.
Changes since v2:
- Rebase on top of new api in i915_edp_psr_debug.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 tests/kms_frontbuffer_tracking.c | 44 ++++++++++++++++++++++++++++++--
 1 file changed, 42 insertions(+), 2 deletions(-)

diff --git a/tests/kms_frontbuffer_tracking.c b/tests/kms_frontbuffer_tracking.c
index 1dfd7c1cee8d..06ad55709dc6 100644
--- a/tests/kms_frontbuffer_tracking.c
+++ b/tests/kms_frontbuffer_tracking.c
@@ -775,6 +775,46 @@ static void drrs_set(unsigned int val)
 		igt_assert_f(ret == (sizeof(buf) - 1), "debugfs_write failed");
 }
 
+static void restore_psr_debugfs(int sig)
+{
+	debugfs_write("i915_edp_psr_debug", "0");
+}
+
+static bool psr_modparam_set(unsigned int val)
+{
+	static int oldval = -1;
+
+	igt_set_module_param_int("enable_psr", val);
+
+	if (val == oldval)
+		return false;
+
+	oldval = val;
+	return true;
+}
+
+static bool psr_set(bool enable)
+{
+	int ret;
+
+	/* Check if new PSR debugfs api is usable. */
+	ret = debugfs_write("i915_edp_psr_debug", "0xf");
+	if (ret == -ENODEV) {
+		/* PSR not enabled, should only be able to set or unset. */
+		igt_assert(!enable);
+		return false;
+	}
+
+	if (ret != -EINVAL)
+		return psr_modparam_set(enable);
+
+	ret = debugfs_write("i915_edp_psr_debug", enable ? "0x2" : "0x1");
+	igt_assert_lt(0, ret);
+
+	igt_install_exit_handler(restore_psr_debugfs);
+	return false;
+}
+
 static bool is_drrs_high(void)
 {
 	char buf[MAX_DRRS_STATUS_BUF_LEN];
@@ -941,8 +981,8 @@ static bool drrs_wait_until_rr_switch_to_low(void)
 
 #define fbc_enable() igt_set_module_param_int("enable_fbc", 1)
 #define fbc_disable() igt_set_module_param_int("enable_fbc", 0)
-#define psr_enable() igt_set_module_param_int("enable_psr", 1)
-#define psr_disable() igt_set_module_param_int("enable_psr", 0)
+#define psr_enable()	psr_set(1)
+#define psr_disable()	psr_set(0)
 #define drrs_enable()	drrs_set(1)
 #define drrs_disable()	drrs_set(0)
 
-- 
2.18.0

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