[PATCH v12 2/2] drm/i915: Allow "max bpc" property to limit pipe_bpp
Radhakrishna Sripada
radhakrishna.sripada at intel.com
Thu Oct 11 19:57:07 UTC 2018
On Thu, Oct 11, 2018 at 12:55:15AM -0700, Lisovskiy, Stanislav wrote:
> On Wed, 2018-10-10 at 17:12 -0700, Radhakrishna Sripada wrote:
> > Use the newly added "max bpc" connector property to limit pipe bpp.
> >
> > V3: Use drm_connector_state to access the "max bpc" property
> > V4: Initialize the drm property, add suuport to DP(Ville)
> > V5: Use the property in the connector and fix CI failure(Ville)
> > V6: Use the core function to attach max_bpc property, remove the
> > redundant
> > clamping of pipe bpp based on connector info
> > V7: Fix Checkpatch warnings
> > V9: Cleanup connected_sink_max_bpp and fix initial value in DP(Ville)
> > V12: Fix debug message(Ville)
> >
> > Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> > Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> > Cc: Kishore Kadiyala <kishore.kadiyala at intel.com>
> > Cc: Manasi Navare <manasi.d.navare at intel.com>
> > Cc: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
> > Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> > ---
> > drivers/gpu/drm/i915/intel_display.c | 48 +++++++++++++++++++++-----
> > ----------
> > drivers/gpu/drm/i915/intel_dp.c | 4 +++
> > drivers/gpu/drm/i915/intel_hdmi.c | 5 ++++
> > 3 files changed, 37 insertions(+), 20 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_display.c
> > b/drivers/gpu/drm/i915/intel_display.c
> > index a145efba9157..a597c4410f5d 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -10869,30 +10869,38 @@ static void
> > intel_modeset_update_connector_atomic_state(struct drm_device *dev)
> > drm_connector_list_iter_end(&conn_iter);
> > }
> >
> > -static void
> > -connected_sink_compute_bpp(struct intel_connector *connector,
> > - struct intel_crtc_state *pipe_config)
> > +static int
> > +connected_sink_max_bpp(const struct drm_connector_state *conn_state,
> > + struct intel_crtc_state *pipe_config)
> > {
> > - const struct drm_display_info *info = &connector-
> > >base.display_info;
> > - int bpp = pipe_config->pipe_bpp;
> > + int bpp;
> > + struct drm_display_info *info = &conn_state->connector-
> > >display_info;
> >
> > - DRM_DEBUG_KMS("[CONNECTOR:%d:%s] checking for sink bpp
> > constrains\n",
> > - connector->base.base.id,
> > - connector->base.name);
> > + bpp = min(pipe_config->pipe_bpp, conn_state->max_bpc * 3);
> >
> > - /* Don't use an invalid EDID bpc value */
> > - if (info->bpc != 0 && info->bpc * 3 < bpp) {
> > - DRM_DEBUG_KMS("clamping display bpp (was %d) to EDID
> > reported max of %d\n",
> > - bpp, info->bpc * 3);
> > - pipe_config->pipe_bpp = info->bpc * 3;
> > + switch (conn_state->max_bpc) {
> > + case 6 ... 7:
> > + pipe_config->pipe_bpp = 6 * 3;
> > + case 8 ... 9:
> > + pipe_config->pipe_bpp = 8 * 3;
> > + break;
> > + case 10 ... 11:
> > + pipe_config->pipe_bpp = 10 * 3;
> > + break;
> > + case 12:
> > + pipe_config->pipe_bpp = 12 * 3;
> > + break;
> > + default:
> > + return -EINVAL;
> > }
>
> Why do we need this assignment here? I mean you have already determined
> the minimum value which is stored in bpp, which should be used and then
> check again, that it is not equal and only then use it.
> Could it be just as simple as this(or I simply misunderstand something
> here):
>
> switch (conn_state->max_bpc) {
> case 6 ... 7:
> bpp = 6 * 3;
> ...
> default:
> return -EINVAL;
> }
>
> so here we set bpp(instead of pipe_bpp) to correct value or return
> EINVAL.
> And then we simply assign pipe_bpp to minimum of those and return:
>
> pipe_bpp = min(pipe_config->pipe_bpp, bpp);
>
> return 0;
>
> Also that way get bpp values also check to correspond to the ranges
> given in cases labels, while initial expression
> min(pipe_config->pipe_bpp, conn_state->max_bpc * 3) could possibly give
> 7 * 3 but not 6 * 3(as specified in "case 6 .. 7") for
> conn_state->max_bpc = 7.
>
> So then there is no need in next additional assignment and check:
This actually simplifies. I was trying to modify already existing code.
This definitely looks cleaner. Will try these changes in the next rev.
Thanks,
Radhakrishna(RK) Sripada
>
> >
> > - /* Clamp bpp to 8 on screens without EDID 1.4 */
> > - if (info->bpc == 0 && bpp > 24) {
> > - DRM_DEBUG_KMS("clamping display bpp (was %d) to
> > default limit of 24\n",
> > - bpp);
> > - pipe_config->pipe_bpp = 24;
> > + if (bpp != pipe_config->pipe_bpp) {
> > + DRM_DEBUG_KMS("Limiting display bpp to %d instead of
> > Edid bpp "
> > + "%d, requested bpp %d\n", bpp, 3 *
> > info->bpc,
> > + 3 * conn_state->max_requested_bpc);
> > + pipe_config->pipe_bpp = bpp;
> > }
> > + return 0;
> > }
> >
> > static int
> > @@ -10923,8 +10931,8 @@ compute_baseline_pipe_bpp(struct intel_crtc
> > *crtc,
> > if (connector_state->crtc != &crtc->base)
> > continue;
> >
> > - connected_sink_compute_bpp(to_intel_connector(connec
> > tor),
> > - pipe_config);
> > + if (connected_sink_max_bpp(connector_state,
> > pipe_config) < 0)
> > + return -EINVAL;
> > }
> >
> > return bpp;
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c
> > b/drivers/gpu/drm/i915/intel_dp.c
> > index 0855b9785f7b..863c8832fe8b 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -5705,6 +5705,10 @@ intel_dp_add_properties(struct intel_dp
> > *intel_dp, struct drm_connector *connect
> > intel_attach_force_audio_property(connector);
> >
> > intel_attach_broadcast_rgb_property(connector);
> > + if (HAS_GMCH_DISPLAY(dev_priv))
> > + drm_connector_attach_max_bpc_property(connector, 6,
> > 10);
> > + else if (INTEL_GEN(dev_priv) >= 5)
> > + drm_connector_attach_max_bpc_property(connector, 6,
> > 12);
> >
> > if (intel_dp_is_edp(intel_dp)) {
> > u32 allowed_scalers;
> > diff --git a/drivers/gpu/drm/i915/intel_hdmi.c
> > b/drivers/gpu/drm/i915/intel_hdmi.c
> > index 2c53efc463e6..3158ab085a30 100644
> > --- a/drivers/gpu/drm/i915/intel_hdmi.c
> > +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> > @@ -2103,11 +2103,16 @@ static const struct drm_encoder_funcs
> > intel_hdmi_enc_funcs = {
> > static void
> > intel_hdmi_add_properties(struct intel_hdmi *intel_hdmi, struct
> > drm_connector *connector)
> > {
> > + struct drm_i915_private *dev_priv = to_i915(connector->dev);
> > +
> > intel_attach_force_audio_property(connector);
> > intel_attach_broadcast_rgb_property(connector);
> > intel_attach_aspect_ratio_property(connector);
> > drm_connector_attach_content_type_property(connector);
> > connector->state->picture_aspect_ratio =
> > HDMI_PICTURE_ASPECT_NONE;
> > +
> > + if (!HAS_GMCH_DISPLAY(dev_priv))
> > + drm_connector_attach_max_bpc_property(connector, 8,
> > 12);
> > }
> >
> > /*
> --
> Best Regards,
>
> Lisovskiy Stanislav
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