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.
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>
Reviewed-by: Lyude Paul <ly...@redhat.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 71 ++++++++++++++++++++++++++++-
drivers/gpu/drm/i915/intel_dp.c | 1 +
drivers/gpu/drm/i915/intel_drv.h | 3 ++
3 files changed, 74 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
b/drivers/gpu/drm/i915/i915_debugfs.c
index 5cadfcd03ea9..6e631f08dd4b 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4999,6 +4999,72 @@ static int i915_hdcp_sink_capability_show(struct
seq_file *m, void *data)
}
DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
+static int i915_dsc_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;
+
+ 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, "Enabled: %s\n",
+ yesno(crtc_state->dsc_params.compression_enable));
+ seq_printf(m, "Supported: %s\n",
+ yesno(drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)));
+ drm_modeset_unlock(&crtc->base.mutex);
+
+ return 0;
+}
+
+static ssize_t i915_dsc_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_support_open(struct inode *inode,
+ struct file *file)
+{
+ return single_open(file, i915_dsc_support_show,
+ inode->i_private);
+}
+
+static const struct file_operations i915_dsc_support_fops = {
+ .owner = THIS_MODULE,
+ .open = i915_dsc_support_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = i915_dsc_support_write
+};
+
/**
* i915_debugfs_connector_add - add i915 specific connector debugfs files
* @connector: pointer to a registered drm_connector
@@ -5017,9 +5083,12 @@ int i915_debugfs_connector_add(struct drm_connector
*connector)
return -ENODEV;
if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
- connector->connector_type == DRM_MODE_CONNECTOR_eDP)
+ connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
debugfs_create_file("i915_dpcd", S_IRUGO, root,
connector, &i915_dpcd_fops);
+ debugfs_create_file("i915_dsc_support", S_IRUGO, root,
+ connector, &i915_dsc_support_fops);
+ }
if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
debugfs_create_file("i915_panel_timings", S_IRUGO, root,
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 72e6605f0ed7..0b5939992c2b 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2287,6 +2287,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
return false;
+ DRM_DEBUG_KMS("Force DSC en = %d\n", intel_dp->force_dsc_en);
if (!intel_dp_compute_link_config(encoder, pipe_config))
return false;
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 4f5d17bcd54e..16bbc3768e02 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1196,6 +1196,9 @@ struct intel_dp {
/* Displayport compliance testing */
struct intel_dp_compliance compliance;
+
+ /* Display stream compression testing */
+ bool force_dsc_en;
};
enum lspcon_vendor {
--
2.18.0
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