DSC can be supported per DP connector. This patch adds a per connector
debugfs node to expose DSC support capability by the kernel.
The same node can be used from userspace to force DSC enable.
force_dsc_en written through this debugfs node is used to force
DSC even for lower resolutions.
v5:
* Name it dsc sink support and also add
fec support in the same node (Ville)
v4:
* Add missed connector_status check (Manasi)
* Create i915_dsc_support node only for Gen >=10 (manasi)
* Access intel_dp->dsc_dpcd only if its not NULL (Manasi)
v3:
* Combine Force_dsc_en with this patch (Ville)
v2:
* Use kstrtobool_from_user to avoid explicit error checking (Lyude)
* Rebase on drm-tip (Manasi)
Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
Cc: Ville Syrjala <ville.syrj...@linux.intel.com>
Cc: Anusha Srivatsa <anusha.sriva...@intel.com>
Cc: Lyude Paul <ly...@redhat.com>
Signed-off-by: Manasi Navare <manasi.d.nav...@intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 80 +++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_dp.c | 3 +-
drivers/gpu/drm/i915/intel_drv.h | 3 ++
3 files changed, 85 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
b/drivers/gpu/drm/i915/i915_debugfs.c
index 129b9a6f8309..f2766004778d 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -5086,6 +5086,79 @@ static int i915_hdcp_sink_capability_show(struct
seq_file *m, void *data)
}
DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
+static int i915_dsc_fec_support_show(struct seq_file *m, void *data)
+{
+ struct drm_connector *connector = m->private;
+ struct intel_encoder *encoder = intel_attached_encoder(connector);
+ struct intel_dp *intel_dp =
+ enc_to_intel_dp(&encoder->base);
+ struct intel_crtc *crtc;
+ struct intel_crtc_state *crtc_state;
+
+ if (connector->status != connector_status_connected)
+ return -ENODEV;
+
+ crtc = to_intel_crtc(encoder->base.crtc);
+ crtc_state = to_intel_crtc_state(crtc->base.state);
+ drm_modeset_lock(&crtc->base.mutex, NULL);
+ seq_printf(m, "DSC_Enabled: %s\n",
+ yesno(crtc_state->dsc_params.compression_enable));
+ if (intel_dp->dsc_dpcd)
+ seq_printf(m, "DSC_Sink_Support: %s\n",
+ yesno(drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)));
+ if (intel_dp->fec_capable)
+ seq_printf(m, "FEC_Sink_Support: %s\n",
+
yesno(drm_dp_sink_supports_fec(intel_dp->fec_capable)));
+ drm_modeset_unlock(&crtc->base.mutex);
+
+ return 0;
+}
+
+static ssize_t i915_dsc_fec_support_write(struct file *file,
+ const char __user *ubuf,
+ size_t len, loff_t *offp)
+{
+ bool dsc_enable = false;
+ int ret;
+ struct drm_connector *connector =
+ ((struct seq_file *)file->private_data)->private;
+ struct intel_encoder *encoder = intel_attached_encoder(connector);
+ struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+
+ if (len == 0)
+ return 0;
+
+ DRM_DEBUG_DRIVER("Copied %d bytes from user to force DSC\n",
+ (unsigned int)len);
+
+ ret = kstrtobool_from_user(ubuf, len, &dsc_enable);
+ if (ret < 0)
+ return ret;
+
+ DRM_DEBUG_DRIVER("Got %s for DSC Enable\n",
+ (dsc_enable) ? "true" : "false");
+ intel_dp->force_dsc_en = dsc_enable;
+
+ *offp += len;
+ return len;
+}
+
+static int i915_dsc_fec_support_open(struct inode *inode,
+ struct file *file)
+{
+ return single_open(file, i915_dsc_fec_support_show,
+ inode->i_private);
+}
+
+static const struct file_operations i915_dsc_fec_support_fops = {
+ .owner = THIS_MODULE,
+ .open = i915_dsc_fec_support_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = i915_dsc_fec_support_write
+};
+
/**
* i915_debugfs_connector_add - add i915 specific connector debugfs files
* @connector: pointer to a registered drm_connector
@@ -5098,6 +5171,7 @@ DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
int i915_debugfs_connector_add(struct drm_connector *connector)
{
struct dentry *root = connector->debugfs_entry;
+ struct drm_i915_private *dev_priv = to_i915(connector->dev);
/* The connector must have been registered beforehands. */
if (!root)
@@ -5122,5 +5196,11 @@ int i915_debugfs_connector_add(struct drm_connector
*connector)
connector, &i915_hdcp_sink_capability_fops);
}
+ if (INTEL_GEN(dev_priv) >= 10 &&
+ (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
+ connector->connector_type == DRM_MODE_CONNECTOR_eDP))
+ debugfs_create_file("i915_dsc_fec_support", S_IRUGO, root,
+ connector, &i915_dsc_fec_support_fops);
+
return 0;
}
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index a6907a1761ab..2e3097cae277 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2051,7 +2051,8 @@ intel_dp_compute_link_config(struct intel_encoder
*encoder,
&limits);
/* enable compression if the mode doesn't fit available BW */
- if (!ret) {
+ DRM_DEBUG_KMS("Force DSC en = %d\n", intel_dp->force_dsc_en);
+ if (!ret || intel_dp->force_dsc_en) {
if (!intel_dp_dsc_compute_config(intel_dp, pipe_config,
conn_state, &limits))
return false;
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index f94a04b4ad87..0cedce438433 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1209,6 +1209,9 @@ struct intel_dp {
/* Displayport compliance testing */
struct intel_dp_compliance compliance;
+
+ /* Display stream compression testing */
+ bool force_dsc_en;
};
enum lspcon_vendor {
--
2.19.1
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