On Wed, Oct 24, 2018 at 06:28:02PM -0400, Lyude Paul wrote:
> On Wed, 2018-10-24 at 15:28 -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.
> >
> > v2:
> > * Use kstrtobool_from_user to avoid explicit error checking (Lyude)
> > * Rebase on drm-tip (Manasi)
> >
> > Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> > Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
> > Cc: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
> > Cc: Lyude Paul <lyude@xxxxxxxxxx>
> > Signed-off-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
> > Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
>
> (just making a note to anyone passing by this: my R-B here is still valid!)
> (also thanks for the patch :)
Thanks Lyude for thsi note and the initial review feedback! Appreciate your time and inputs.
Manasi
> > ---
> > 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 {
> --
> Cheers,
> Lyude Paul
>
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