On Wed, Oct 18, 2023 at 04:24:00PM +0300, Stanislav Lisovskiy wrote:
For validation purposes, it might be useful to be able to
force Bigjoiner mode, even if current dotclock/resolution
do not require that.
Lets add such to option to debugfs.
v2: - Apparently intel_dp_need_bigjoiner can't be used, when
debugfs entry is created so lets just check manually
the DISPLAY_VER.
v3: - Switch to intel_connector from drm_connector(Jani Nikula)
- Remove redundant modeset lock(Jani Nikula)
- Use kstrtobool_from_user for boolean value(Jani Nikula)
v4: - Apply the changes to proper function(Jani Nikula)
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
---
.../drm/i915/display/intel_display_debugfs.c | 66 +++++++++++++++++++
.../drm/i915/display/intel_display_types.h | 2 +
drivers/gpu/drm/i915/display/intel_dp.c | 6 +-
3 files changed, 73 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index fbe75d47a165..9b810c6f96ea 100644
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -1398,6 +1398,30 @@ out: drm_modeset_unlock(&dev->mode_config.connection_mutex);
return ret;
}
+static int i915_bigjoiner_enable_show(struct seq_file *m, void *data)
+{
+ struct intel_connector *connector = to_intel_connector(m->private);
+ struct drm_crtc *crtc;
+ struct intel_encoder *encoder = intel_attached_encoder(connector);
+ struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+ int ret = 0;
+
+ if (!encoder)
+ return -ENODEV;
+
+ crtc = connector->base.state->crtc;
+ if (connector->base.status != connector_status_connected || !crtc) {
+ ret = -ENODEV;
Why do we need this extra complication?
+ goto out;
+ }
+
+ seq_printf(m, "Bigjoiner enable: %d\n", intel_dp->force_bigjoiner_enable);
+
+out:
+
+ return ret;
+}
+
static ssize_t i915_dsc_output_format_write(struct file *file,
const char __user *ubuf,
size_t len, loff_t *offp)
@@ -1419,12 +1443,39 @@ static ssize_t i915_dsc_output_format_write(struct file *file,
return len;
}
+static ssize_t i915_bigjoiner_enable_fops_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 intel_encoder *encoder = intel_attached_encoder(connector);
+ struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+ bool bigjoiner_en = 0;
+ int ret;
+
+ ret = kstrtobool_from_user(ubuf, len, &bigjoiner_en);
+ if (ret < 0)
+ return ret;
+
+ intel_dp->force_bigjoiner_enable = bigjoiner_en;
+ *offp += len;
+
+ return len;
+}
+
static int i915_dsc_output_format_open(struct inode *inode,
struct file *file)
{
return single_open(file, i915_dsc_output_format_show, inode->i_private);
}
+static int i915_bigjoiner_enable_open(struct inode *inode,
+ struct file *file)
+{
+ return single_open(file, i915_bigjoiner_enable_show, inode->i_private);
+}
+
static const struct file_operations i915_dsc_output_format_fops = {
.owner = THIS_MODULE,
.open = i915_dsc_output_format_open,
@@ -1434,6 +1485,15 @@ static const struct file_operations i915_dsc_output_format_fops = {
.write = i915_dsc_output_format_write
};
+static const struct file_operations i915_bigjoiner_enable_fops = {
+ .owner = THIS_MODULE,
+ .open = i915_bigjoiner_enable_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = i915_bigjoiner_enable_fops_write
+};
+
/*
* Returns the Current CRTC's bpc.
* Example usage: cat /sys/kernel/debug/dri/0/crtc-0/i915_current_bpc
@@ -1513,6 +1573,12 @@ void intel_connector_debugfs_add(struct intel_connector *intel_connector)
connector, &i915_dsc_output_format_fops);
}
+ if (DISPLAY_VER(dev_priv) >= 11 &&
+ intel_connector->base.connector_type == DRM_MODE_CONNECTOR_DisplayPort) {
eDP missing
+ debugfs_create_file("i915_bigjoiner_force_enable", 0644, root,
+ &intel_connector->base, &i915_bigjoiner_enable_fops);
+ }
+
if (connector->connector_type == DRM_MODE_CONNECTOR_DSI ||
connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 8d8b2f8d37a9..e0de6eeaf59e 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1753,6 +1753,8 @@ struct intel_dp {
bool is_mst;
int active_mst_links;
+ bool force_bigjoiner_enable;
+
/* connector directly attached - won't be use for modeset in mst world */
struct intel_connector *attached_connector;
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 4f6835a7578e..6a9148232a9c 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1153,7 +1153,11 @@ bool intel_dp_need_bigjoiner(struct intel_dp *intel_dp,
if (!intel_dp_can_bigjoiner(intel_dp))
return false;
- return clock > i915->max_dotclk_freq || hdisplay > 5120;
+ if (intel_dp->force_bigjoiner_enable)
+ drm_dbg_kms(&i915->drm, "Forcing bigjoiner mode\n");
That's going to cause excessive dmesg spam.
