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drm/i915/display/dsc: Add Per connector debugfs node for DSC BPP enable

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This patch creates a per connector debugfs node to expose
the Compressed BPP. The same node can be used from userspace
to force DSC to a certain BPP(all accepted values).

This is useful to verify all supported/requested
compression bpp's through IGT

v2: Remove unnecessary logic (Jani)
v3: Drop pipe bpp in debugfs node (Vandita)
v4: Minor cleanups (Vandita)
v5: Fix NULL pointer dereference
v6: Fix dim tool checkpatch errors
    Release the lock before return (Vandita)
v7: Rename to file to dsc_bpp, remove unwanted
    dsc bpp range check from v6, permissions (Jani)

Cc: Vandita Kulkarni <vandita.kulkarni@intel.com>
Cc: Navare Manasi D <manasi.d.navare@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Patnana Venkata Sai <venkata.sai.patnana@intel.com>
Signed-off-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210720064907.9771-3-vandita.kulkarni@intel.com
This commit is contained in:
Patnana Venkata Sai 2021-07-20 12:19:06 +05:30 committed by Vandita Kulkarni
parent d77e37063b
commit da3829ef99
2 changed files with 76 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
drivers/gpu/drm/i915/display/intel_display_debugfs.c
View File

@ -2395,6 +2395,73 @@ static const struct file_operations i915_dsc_fec_support_fops = {
.write = i915_dsc_fec_support_write
};
static int i915_dsc_bpp_show(struct seq_file *m, void *data)
{
struct drm_connector *connector = m->private;
struct drm_device *dev = connector->dev;
struct drm_crtc *crtc;
struct intel_crtc_state *crtc_state;
struct intel_encoder *encoder = intel_attached_encoder(to_intel_connector(connector));
int ret;
if (!encoder)
return -ENODEV;
ret = drm_modeset_lock_single_interruptible(&dev->mode_config.connection_mutex);
if (ret)
return ret;
crtc = connector->state->crtc;
if (connector->status != connector_status_connected || !crtc) {
ret = -ENODEV;
goto out;
}
crtc_state = to_intel_crtc_state(crtc->state);
seq_printf(m, "Compressed_BPP: %d\n", crtc_state->dsc.compressed_bpp);
out: drm_modeset_unlock(&dev->mode_config.connection_mutex);
return ret;
}
static ssize_t i915_dsc_bpp_write(struct file *file,
const char __user *ubuf,
size_t len, loff_t *offp)
{
struct drm_connector *connector =
((struct seq_file *)file->private_data)->private;
struct intel_encoder *encoder = intel_attached_encoder(to_intel_connector(connector));
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
int dsc_bpp = 0;
int ret;
ret = kstrtoint_from_user(ubuf, len, 0, &dsc_bpp);
if (ret < 0)
return ret;
intel_dp->force_dsc_bpp = dsc_bpp;
*offp += len;
return len;
}
static int i915_dsc_bpp_open(struct inode *inode,
struct file *file)
{
return single_open(file, i915_dsc_bpp_show,
inode->i_private);
}
static const struct file_operations i915_dsc_bpp_fops = {
.owner = THIS_MODULE,
.open = i915_dsc_bpp_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = i915_dsc_bpp_write
};
/**
* intel_connector_debugfs_add - add i915 specific connector debugfs files
* @connector: pointer to a registered drm_connector
@ -2433,10 +2500,17 @@ int intel_connector_debugfs_add(struct drm_connector *connector)
connector, &i915_hdcp_sink_capability_fops);
}
if ((DISPLAY_VER(dev_priv) >= 11 || IS_CANNONLAKE(dev_priv)) && ((connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort && !to_intel_connector(connector)->mst_port) || connector->connector_type == DRM_MODE_CONNECTOR_eDP))
if ((DISPLAY_VER(dev_priv) >= 11 || IS_CANNONLAKE(dev_priv)) &&
((connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort &&
!to_intel_connector(connector)->mst_port) ||
connector->connector_type == DRM_MODE_CONNECTOR_eDP)) {
debugfs_create_file("i915_dsc_fec_support", 0644, root,
connector, &i915_dsc_fec_support_fops);
debugfs_create_file("i915_dsc_bpp", 0644, root,
connector, &i915_dsc_bpp_fops);
}
/* Legacy panels doesn't lpsp on any platform */
if ((DISPLAY_VER(dev_priv) >= 9 || IS_HASWELL(dev_priv) ||
IS_BROADWELL(dev_priv)) &&

1
drivers/gpu/drm/i915/display/intel_display_types.h
View File

@ -1612,6 +1612,7 @@ struct intel_dp {
/* Display stream compression testing */
bool force_dsc_en;
int force_dsc_bpp;
bool hobl_failed;
bool hobl_active;