From: Anusha Srivatsa anusha.srivatsa@intel.com
DSC can be supported per DP connector. This patch creates a per connector debugfs node to expose the Input and Compressed BPP.
The same node can be used from userspace to force DSC to a certain BPP.
force_dsc_bpp is written through this debugfs node to force DSC BPP to all accepted values
Cc: Vandita Kulkarni vandita.kulkarni@intel.com Cc: Manasi Navare manasi.d.navare@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: Matt Roper matthew.d.roper@intel.com --- .../drm/i915/display/intel_display_debugfs.c | 103 +++++++++++++++++- .../drm/i915/display/intel_display_types.h | 1 + 2 files changed, 103 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 af9e58619667..1805d70ea817 100644 --- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c +++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c @@ -2389,6 +2389,100 @@ static const struct file_operations i915_dsc_fec_support_fops = { .write = i915_dsc_fec_support_write };
+static int i915_dsc_bpp_support_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_dp *intel_dp; + struct drm_modeset_acquire_ctx ctx; + struct intel_crtc_state *crtc_state = NULL; + int ret = 0; + bool try_again = false; + + drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE); + + do { + try_again = false; + ret = drm_modeset_lock(&dev->mode_config.connection_mutex, + &ctx); + if (ret) { + ret = -EINTR; + break; + } + crtc = connector->state->crtc; + if (connector->status != connector_status_connected || !crtc) { + ret = -ENODEV; + break; + } + ret = drm_modeset_lock(&crtc->mutex, &ctx); + if (ret == -EDEADLK) { + ret = drm_modeset_backoff(&ctx); + if (!ret) { + try_again = true; + continue; + } + break; + } else if (ret) { + break; + } + intel_dp = intel_attached_dp(to_intel_connector(connector)); + crtc_state = to_intel_crtc_state(crtc->state); + seq_printf(m, "Input_BPP: %d\n", crtc_state->pipe_bpp); + seq_printf(m, "Compressed_BPP: %d\n", + crtc_state->dsc.compressed_bpp); + } while (try_again); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); + + return ret; +} + +static ssize_t i915_dsc_bpp_support_write(struct file *file, + const char __user *ubuf, + size_t len, loff_t *offp) +{ + int dsc_bpp = 0; + int ret; + struct drm_connector *connector = + ((struct seq_file *)file->private_data)->private; + struct intel_encoder *encoder = intel_attached_encoder(to_intel_connector(connector)); + struct drm_i915_private *i915 = to_i915(encoder->base.dev); + struct intel_dp *intel_dp = enc_to_intel_dp(encoder); + + if (len == 0) + return 0; + + drm_dbg(&i915->drm, + "Copied %zu bytes from user to force BPP\n", len); + + ret = kstrtoint_from_user(ubuf, len, 0, &dsc_bpp); + + intel_dp->force_dsc_bpp = dsc_bpp; + if (ret < 0) + return ret; + + *offp += len; + return len; +} + +static int i915_dsc_bpp_support_open(struct inode *inode, + struct file *file) +{ + return single_open(file, i915_dsc_bpp_support_show, + inode->i_private); +} + +static const struct file_operations i915_dsc_bpp_support_fops = { + .owner = THIS_MODULE, + .open = i915_dsc_bpp_support_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, + .write = i915_dsc_bpp_support_write +}; + /** * intel_connector_debugfs_add - add i915 specific connector debugfs files * @connector: pointer to a registered drm_connector @@ -2427,9 +2521,16 @@ 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", S_IRUGO, root, connector, &i915_dsc_fec_support_fops); + debugfs_create_file("i915_dsc_bpp_support", 0444, + root, connector, + &i915_dsc_bpp_support_fops); + }
/* Legacy panels doesn't lpsp on any platform */ if ((DISPLAY_VER(dev_priv) >= 9 || IS_HASWELL(dev_priv) || diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h index 29ae1d9b5abc..00320d89d266 100644 --- a/drivers/gpu/drm/i915/display/intel_display_types.h +++ b/drivers/gpu/drm/i915/display/intel_display_types.h @@ -1627,6 +1627,7 @@ struct intel_dp {
/* Display stream compression testing */ bool force_dsc_en; + int force_dsc_bpp;
bool hobl_failed; bool hobl_active;