[PATCH 01/14] drm/i915/display: Modify debugfs for joiner to force n pipes

[Ankit Nautiyal <ankit.k.nautiyal@intel.com>]

At the moment, the debugfs for joiner allows only to force enable/disable
pipe joiner for 2 pipes. Modify it to force join 'n' number of pipes,
where n is a valid pipe joiner configuration.
This will help in case of ultra joiner where 4 pipes are joined.

v2:
-Fix commit message to state that only valid joiner config can be
forced. (Suraj)
-Rename the identifiers to have INTEL_BIG/NONE_JOINER_PIPES. (Suraj)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
---
 .../drm/i915/display/intel_display_debugfs.c  | 71 ++++++++++++++++++-
 .../drm/i915/display/intel_display_types.h    |  8 ++-
 drivers/gpu/drm/i915/display/intel_dp.c       |  2 +-
 3 files changed, 77 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index 830b9eb60976..0ef573afd8a1 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -1504,6 +1504,73 @@ static int intel_crtc_pipe_show(struct seq_file *m, void *unused)
 }
 DEFINE_SHOW_ATTRIBUTE(intel_crtc_pipe);
 
+static int i915_joiner_show(struct seq_file *m, void *data)
+{
+	struct intel_connector *connector = m->private;
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	int ret;
+
+	ret = drm_modeset_lock_single_interruptible(&i915->drm.mode_config.connection_mutex);
+	if (ret)
+		return ret;
+
+	seq_printf(m, "Force_joined_pipes: %d\n", connector->force_joined_pipes);
+
+	drm_modeset_unlock(&i915->drm.mode_config.connection_mutex);
+
+	return ret;
+}
+
+static ssize_t i915_joiner_write(struct file *file,
+				 const char __user *ubuf,
+				 size_t len, loff_t *offp)
+{
+	struct seq_file *m = file->private_data;
+	struct intel_connector *connector = m->private;
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	int force_join_pipes = 0;
+	int ret;
+
+	if (len == 0)
+		return 0;
+
+	drm_dbg(&i915->drm,
+		"Copied %zu bytes from user to force joiner\n", len);
+
+	ret = kstrtoint_from_user(ubuf, len, 0, &force_join_pipes);
+	if (ret < 0)
+		return ret;
+
+	drm_dbg(&i915->drm, "Got %d for force joining pipes\n", force_join_pipes);
+
+	if (force_join_pipes < INTEL_NONE_JOINER_PIPES ||
+	    force_join_pipes >= INTEL_INVALID_JOINER_PIPES) {
+		drm_dbg(&i915->drm, "Ignoring Invalid num of pipes %d for force joining\n",
+			force_join_pipes);
+		connector->force_joined_pipes = INTEL_NONE_JOINER_PIPES;
+	} else {
+		connector->force_joined_pipes = force_join_pipes;
+	}
+
+	*offp += len;
+
+	return len;
+}
+
+static int i915_joiner_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, i915_joiner_show, inode->i_private);
+}
+
+static const struct file_operations i915_joiner_fops = {
+	.owner = THIS_MODULE,
+	.open = i915_joiner_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+	.write = i915_joiner_write
+};
+
 /**
  * intel_connector_debugfs_add - add i915 specific connector debugfs files
  * @connector: pointer to a registered intel_connector
@@ -1553,8 +1620,8 @@ void intel_connector_debugfs_add(struct intel_connector *connector)
 	if (DISPLAY_VER(i915) >= 11 &&
 	    (connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
 	     connector_type == DRM_MODE_CONNECTOR_eDP)) {
-		debugfs_create_bool("i915_bigjoiner_force_enable", 0644, root,
-				    &connector->force_bigjoiner_enable);
+		debugfs_create_file("i915_joiner_force_enable", 0644, root,
+				    connector, &i915_joiner_fops);
 	}
 
 	if (connector_type == DRM_MODE_CONNECTOR_DSI ||
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 733de5edcfdb..c213fb61ceb7 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -486,6 +486,12 @@ struct intel_hdcp {
 	enum transcoder stream_transcoder;
 };
 
+enum intel_joiner_pipe_count {
+	INTEL_NONE_JOINER_PIPES = 0,
+	INTEL_BIG_JOINER_PIPES = 2,
+	INTEL_INVALID_JOINER_PIPES,
+};
+
 struct intel_connector {
 	struct drm_connector base;
 	/*
@@ -524,7 +530,7 @@ struct intel_connector {
 
 	struct intel_dp *mst_port;
 
-	bool force_bigjoiner_enable;
+	enum intel_joiner_pipe_count force_joined_pipes;
 
 	struct {
 		struct drm_dp_aux *dsc_decompression_aux;
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index a1fcedfd404b..862a460c32b7 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1271,7 +1271,7 @@ bool intel_dp_need_joiner(struct intel_dp *intel_dp,
 		return false;
 
 	return clock > i915->display.cdclk.max_dotclk_freq || hdisplay > 5120 ||
-	       connector->force_bigjoiner_enable;
+	       connector->force_joined_pipes == INTEL_BIG_JOINER_PIPES;
 }
 
 bool intel_dp_has_dsc(const struct intel_connector *connector)
-- 
2.45.2