diff mbox series

[v8,19/19] drm/i915/dsc: Add Per connector debugfs node for DSC support/enable

Message ID 20181102213138.301-20-manasi.d.navare@intel.com (mailing list archive)
State New, archived
Headers show
Series DSC enabling remaining patches respin | expand

Commit Message

Navare, Manasi Nov. 2, 2018, 9:31 p.m. UTC 
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.

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.vivi@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Lyude Paul <lyude@redhat.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 71 ++++++++++++++++++++++++++++-
 drivers/gpu/drm/i915/intel_dp.c     |  3 +-
 drivers/gpu/drm/i915/intel_drv.h    |  3 ++
 3 files changed, 75 insertions(+), 2 deletions(-)

Comments

Navare, Manasi Nov. 3, 2018, 2:40 a.m. UTC | #1 
On Fri, Nov 02, 2018 at 02:31:38PM -0700, Manasi Navare wrote:
> 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.
> 
> 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.vivi@intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Cc: Lyude Paul <lyude@redhat.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Reviewed-by: Lyude Paul <lyude@redhat.com>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 71 ++++++++++++++++++++++++++++-
>  drivers/gpu/drm/i915/intel_dp.c     |  3 +-
>  drivers/gpu/drm/i915/intel_drv.h    |  3 ++
>  3 files changed, 75 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 1a4d9d996fda..fe619b54b64d 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -5000,6 +5000,72 @@ 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;

Missed this check in the rebase or respin:

if (connector->status != connector_status_connected)

resulting into a lot of CI errors. will fix this in the next rev

> +
> +	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
> @@ -5018,9 +5084,12 @@ 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);

also since DSC only supported on GEN >= 10, should we create this node only for higher GENs?

Manasi

> +	}
>  
>  	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 f8bf942c8f71..4d866d49d870 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -2158,7 +2158,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
>  							&limits);
>  
>  	/* enable compression if the mode doesn't fit available BW */
> -	if (!ret) {
> +	if (!ret || intel_dp->force_dsc_en) {
>  		if (!intel_dp_dsc_compute_config(intel_dp, pipe_config,
>  						 &limits))
>  			return false;
> @@ -2251,6 +2251,7 @@ 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 2d41dff6eed1..df7b76ca3fde 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1199,6 +1199,9 @@ 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
>
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 1a4d9d996fda..fe619b54b64d 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -5000,6 +5000,72 @@  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
@@ -5018,9 +5084,12 @@  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 f8bf942c8f71..4d866d49d870 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2158,7 +2158,7 @@  intel_dp_compute_link_config(struct intel_encoder *encoder,
 							&limits);
 
 	/* enable compression if the mode doesn't fit available BW */
-	if (!ret) {
+	if (!ret || intel_dp->force_dsc_en) {
 		if (!intel_dp_dsc_compute_config(intel_dp, pipe_config,
 						 &limits))
 			return false;
@@ -2251,6 +2251,7 @@  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 2d41dff6eed1..df7b76ca3fde 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1199,6 +1199,9 @@  struct intel_dp {
 
 	/* Displayport compliance testing */
 	struct intel_dp_compliance compliance;
+
+	/* Display stream compression testing */
+	bool force_dsc_en;
 };
 
 enum lspcon_vendor {