[Intel-gfx] [PATCH v6 05/11] drm/i915: Try to make bigjoiner work in atomic check
Navare, Manasi
manasi.d.navare at intel.com
Fri Aug 21 18:22:00 UTC 2020
On Fri, Aug 21, 2020 at 03:46:48PM +0530, Manna, Animesh wrote:
>
> On 16-07-2020 04:12, Manasi Navare wrote:
> >From: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> >
> > When the clock is higher than the dotclock, try with 2 pipes enabled.
> > If we can enable 2, then we will go into big joiner mode, and steal
> > the adjacent crtc.
> >
> > This only links the crtc's in software, no hardware or plane
> > programming is done yet. Blobs are also copied from the master's
> > crtc_state, so it doesn't depend at commit time on the other
> > crtc_state.
> >
> >v3:
> >* Manual Rebase (Manasi)
> > Changes since v1:
> > - Rename pipe timings to transcoder timings, as they are now different.
> > Changes since v2:
> > - Rework bigjoiner checks; always disable slave when recalculating
> > master. No need to have a separate bigjoiner pass any more.
> > - Use pipe_mode instead of transcoder_mode, to clean up the code.
> >
> >Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> >Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
> >---
> > drivers/gpu/drm/i915/display/intel_atomic.c | 9 +-
> > drivers/gpu/drm/i915/display/intel_atomic.h | 3 +-
> > drivers/gpu/drm/i915/display/intel_display.c | 201 ++++++++++++++++--
> > .../drm/i915/display/intel_display_types.h | 9 +
> > drivers/gpu/drm/i915/display/intel_dp.c | 22 +-
> > 5 files changed, 211 insertions(+), 33 deletions(-)
> >
> >diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
> >index 630f49b7aa01..b9dcdc74a10d 100644
> >--- a/drivers/gpu/drm/i915/display/intel_atomic.c
> >+++ b/drivers/gpu/drm/i915/display/intel_atomic.c
> >@@ -270,14 +270,15 @@ void intel_crtc_free_hw_state(struct intel_crtc_state *crtc_state)
> > intel_crtc_put_color_blobs(crtc_state);
> > }
> >-void intel_crtc_copy_color_blobs(struct intel_crtc_state *crtc_state)
> >+void intel_crtc_copy_color_blobs(struct intel_crtc_state *crtc_state,
> >+ const struct intel_crtc_state *from_crtc_state)
>
> can we use primary_crtc_state instead of from_crtc_state?
You mean more intiutive naming instead of from_crtc_state ?
I feel primary_crtc_state might be confusing with primary/secondary planes naming
But may be we call it master_crtc_state or primary_big_joiner_crtc_state ?
@Maarten @Ville, any thoughts on better naming here?
>
> > {
> > drm_property_replace_blob(&crtc_state->hw.degamma_lut,
> >- crtc_state->uapi.degamma_lut);
> >+ from_crtc_state->uapi.degamma_lut);
> > drm_property_replace_blob(&crtc_state->hw.gamma_lut,
> >- crtc_state->uapi.gamma_lut);
> >+ from_crtc_state->uapi.gamma_lut);
> > drm_property_replace_blob(&crtc_state->hw.ctm,
> >- crtc_state->uapi.ctm);
> >+ from_crtc_state->uapi.ctm);
> > }
> > /**
> >diff --git a/drivers/gpu/drm/i915/display/intel_atomic.h b/drivers/gpu/drm/i915/display/intel_atomic.h
> >index 11146292b06f..fc556c032c8f 100644
> >--- a/drivers/gpu/drm/i915/display/intel_atomic.h
> >+++ b/drivers/gpu/drm/i915/display/intel_atomic.h
> >@@ -43,7 +43,8 @@ struct drm_crtc_state *intel_crtc_duplicate_state(struct drm_crtc *crtc);
> > void intel_crtc_destroy_state(struct drm_crtc *crtc,
> > struct drm_crtc_state *state);
> > void intel_crtc_free_hw_state(struct intel_crtc_state *crtc_state);
> >-void intel_crtc_copy_color_blobs(struct intel_crtc_state *crtc_state);
> >+void intel_crtc_copy_color_blobs(struct intel_crtc_state *crtc_state,
> >+ const struct intel_crtc_state *from_crtc_state);
> > struct drm_atomic_state *intel_atomic_state_alloc(struct drm_device *dev);
> > void intel_atomic_state_free(struct drm_atomic_state *state);
> > void intel_atomic_state_clear(struct drm_atomic_state *state);
> >diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> >index 3ecb642805a6..955e19abb563 100644
> >--- a/drivers/gpu/drm/i915/display/intel_display.c
> >+++ b/drivers/gpu/drm/i915/display/intel_display.c
> >@@ -8016,9 +8016,24 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc,
> > struct intel_crtc_state *pipe_config)
> > {
> > struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> >- const struct drm_display_mode *pipe_mode = &pipe_config->hw.pipe_mode;
> >+ struct drm_display_mode *pipe_mode = &pipe_config->hw.pipe_mode;
> > int clock_limit = dev_priv->max_dotclk_freq;
> >+ *pipe_mode = pipe_config->hw.adjusted_mode;
> >+
> >+ /* Adjust pipe_mode for bigjoiner, with half the horizontal mode */
> >+ if (pipe_config->bigjoiner) {
> >+ pipe_mode->crtc_clock /= 2;
> >+ pipe_mode->crtc_hdisplay /= 2;
> >+ pipe_mode->crtc_hblank_start /= 2;
> >+ pipe_mode->crtc_hblank_end /= 2;
> >+ pipe_mode->crtc_hsync_start /= 2;
> >+ pipe_mode->crtc_hsync_end /= 2;
> >+ pipe_mode->crtc_htotal /= 2;
> >+ pipe_mode->crtc_hskew /= 2;
> >+ pipe_config->pipe_src_w /= 2;
> >+ }
> >+
> > if (INTEL_GEN(dev_priv) < 4) {
> > clock_limit = dev_priv->max_cdclk_freq * 9 / 10;
> >@@ -8079,7 +8094,7 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc,
> > * WaPruneModeWithIncorrectHsyncOffset:ctg,elk,ilk,snb,ivb,vlv,hsw.
> > */
> > if ((INTEL_GEN(dev_priv) > 4 || IS_G4X(dev_priv)) &&
> >- pipe_mode->crtc_hsync_start == pipe_mode->crtc_hdisplay)
> >+ pipe_config->hw.adjusted_mode.crtc_hsync_start == pipe_mode->crtc_hdisplay)
> > return -EINVAL;
> > intel_crtc_compute_pixel_rate(pipe_config);
> >@@ -12433,7 +12448,7 @@ static bool encoders_cloneable(const struct intel_encoder *a,
> > b->cloneable & (1 << a->type));
> > }
> >-static bool check_single_encoder_cloning(struct drm_atomic_state *state,
> >+static bool check_single_encoder_cloning(struct intel_atomic_state *state,
>
> we may not need it.
What do you mean we may not need it? Do you mean making it static not needed?
>
> > struct intel_crtc *crtc,
> > struct intel_encoder *encoder)
> > {
> >@@ -12442,7 +12457,7 @@ static bool check_single_encoder_cloning(struct drm_atomic_state *state,
> > struct drm_connector_state *connector_state;
> > int i;
> >- for_each_new_connector_in_state(state, connector, connector_state, i) {
> >+ for_each_new_connector_in_state(&state->base, connector, connector_state, i) {
> > if (connector_state->crtc != &crtc->base)
> > continue;
> >@@ -12682,6 +12697,7 @@ static int intel_crtc_atomic_check(struct intel_atomic_state *state,
> > if (mode_changed && crtc_state->hw.enable &&
> > dev_priv->display.crtc_compute_clock &&
> >+ !crtc_state->bigjoiner_slave &&
>
> based on recent direction better to use primary/secondary keyword instead of master/slave.
Hmm, but in terms of big joiner terminology, we still call it master and slave. But we can discuss
offline on the recent direction and figure out the best naming.
Manasi
>
> > !drm_WARN_ON(&dev_priv->drm, crtc_state->shared_dpll)) {
> > ret = dev_priv->display.crtc_compute_clock(crtc, crtc_state);
> > if (ret)
> >@@ -13206,18 +13222,31 @@ static bool check_digital_port_conflicts(struct intel_atomic_state *state)
> > }
> > static void
> >-intel_crtc_copy_uapi_to_hw_state_nomodeset(struct intel_crtc_state *crtc_state)
> >+intel_crtc_copy_uapi_to_hw_state_nomodeset(struct intel_atomic_state *state,
> >+ struct intel_crtc_state *crtc_state)
> > {
> >- intel_crtc_copy_color_blobs(crtc_state);
> >+ const struct intel_crtc_state *from_crtc_state = crtc_state;
> >+
> >+ if (crtc_state->bigjoiner_slave) {
> >+ from_crtc_state = intel_atomic_get_new_crtc_state(state,
> >+ crtc_state->bigjoiner_linked_crtc);
> >+
> >+ /* No need to copy state if the master state is unchanged */
> >+ if (!from_crtc_state)
> >+ return;
> >+ }
> >+
> >+ intel_crtc_copy_color_blobs(crtc_state, from_crtc_state);
> > }
> > static void
> >-intel_crtc_copy_uapi_to_hw_state(struct intel_crtc_state *crtc_state)
> >+intel_crtc_copy_uapi_to_hw_state(struct intel_atomic_state *state,
> >+ struct intel_crtc_state *crtc_state)
> > {
> > crtc_state->hw.enable = crtc_state->uapi.enable;
> > crtc_state->hw.active = crtc_state->uapi.active;
> > crtc_state->hw.pipe_mode = crtc_state->hw.adjusted_mode = crtc_state->uapi.adjusted_mode;
> >- intel_crtc_copy_uapi_to_hw_state_nomodeset(crtc_state);
> >+ intel_crtc_copy_uapi_to_hw_state_nomodeset(state, crtc_state);
> > }
> > static void intel_crtc_copy_hw_to_uapi_state(struct intel_crtc_state *crtc_state,
> >@@ -13240,7 +13269,49 @@ static void intel_crtc_copy_hw_to_uapi_state(struct intel_crtc_state *crtc_state
> > }
> > static int
> >-intel_crtc_prepare_cleared_state(struct intel_crtc_state *crtc_state)
> >+copy_bigjoiner_crtc_state(struct intel_crtc_state *crtc_state,
> >+ const struct intel_crtc_state *from_crtc_state)
> >+{
> >+ struct intel_crtc_state *saved_state;
> >+ struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> >+
> >+ saved_state = kmemdup(from_crtc_state, sizeof(*saved_state), GFP_KERNEL);
> >+ if (!saved_state)
> >+ return -ENOMEM;
> >+
> >+ saved_state->uapi = crtc_state->uapi;
> >+ saved_state->scaler_state = crtc_state->scaler_state;
> >+ saved_state->shared_dpll = crtc_state->shared_dpll;
> >+ saved_state->dpll_hw_state = crtc_state->dpll_hw_state;
> >+ saved_state->crc_enabled = crtc_state->crc_enabled;
> >+
> >+ intel_crtc_free_hw_state(crtc_state);
> >+ memcpy(crtc_state, saved_state, sizeof(*crtc_state));
> >+ kfree(saved_state);
> >+
> >+ /* Re-init hw state */
> >+ memset(&crtc_state->hw, 0, sizeof(saved_state->hw));
> >+ crtc_state->hw.enable = from_crtc_state->hw.enable;
> >+ crtc_state->hw.active = from_crtc_state->hw.active;
> >+ crtc_state->hw.pipe_mode = from_crtc_state->hw.pipe_mode;
> >+ crtc_state->hw.adjusted_mode = from_crtc_state->hw.adjusted_mode;
> >+
> >+ /* Some fixups */
> >+ crtc_state->uapi.mode_changed = from_crtc_state->uapi.mode_changed;
> >+ crtc_state->uapi.connectors_changed = from_crtc_state->uapi.connectors_changed;
> >+ crtc_state->uapi.active_changed = from_crtc_state->uapi.active_changed;
> >+ crtc_state->nv12_planes = crtc_state->c8_planes = crtc_state->update_planes = 0;
> >+ crtc_state->bigjoiner_linked_crtc = to_intel_crtc(from_crtc_state->uapi.crtc);
> >+ crtc_state->bigjoiner_slave = true;
> >+ crtc_state->cpu_transcoder = (enum transcoder)crtc->pipe;
> >+ crtc_state->has_audio = false;
> >+
> >+ return 0;
> >+}
> >+
> >+static int
> >+intel_crtc_prepare_cleared_state(struct intel_atomic_state *state,
> >+ struct intel_crtc_state *crtc_state)
> > {
> > struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
> > struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> >@@ -13276,16 +13347,16 @@ intel_crtc_prepare_cleared_state(struct intel_crtc_state *crtc_state)
> > crtc_state->uapi.mode.private_flags = 0;
> > crtc_state->uapi.adjusted_mode.private_flags = 0;
> >- intel_crtc_copy_uapi_to_hw_state(crtc_state);
> >+ intel_crtc_copy_uapi_to_hw_state(state, crtc_state);
> > return 0;
> > }
> > static int
> >-intel_modeset_pipe_config(struct intel_crtc_state *pipe_config)
> >+intel_modeset_pipe_config(struct intel_atomic_state *state,
> >+ struct intel_crtc_state *pipe_config)
> > {
> > struct drm_crtc *crtc = pipe_config->uapi.crtc;
> >- struct drm_atomic_state *state = pipe_config->uapi.state;
> > struct drm_i915_private *i915 = to_i915(pipe_config->uapi.crtc->dev);
> > struct drm_connector *connector;
> > struct drm_connector_state *connector_state;
> >@@ -13327,7 +13398,7 @@ intel_modeset_pipe_config(struct intel_crtc_state *pipe_config)
> > &pipe_config->pipe_src_w,
> > &pipe_config->pipe_src_h);
> >- for_each_new_connector_in_state(state, connector, connector_state, i) {
> >+ for_each_new_connector_in_state(&state->base, connector, connector_state, i) {
> > struct intel_encoder *encoder =
> > to_intel_encoder(connector_state->best_encoder);
> >@@ -13365,7 +13436,7 @@ intel_modeset_pipe_config(struct intel_crtc_state *pipe_config)
> > * adjust it according to limitations or connector properties, and also
> > * a chance to reject the mode entirely.
> > */
> >- for_each_new_connector_in_state(state, connector, connector_state, i) {
> >+ for_each_new_connector_in_state(&state->base, connector, connector_state, i) {
> > struct intel_encoder *encoder =
> > to_intel_encoder(connector_state->best_encoder);
> >@@ -13422,8 +13493,6 @@ intel_modeset_pipe_config(struct intel_crtc_state *pipe_config)
> > * drm_atomic_helper_update_legacy_modeset_state() happy
> > */
> > pipe_config->uapi.adjusted_mode = pipe_config->hw.adjusted_mode;
> >- /* without bigjoiner, pipe_mode == adjusted_mode */
> >- pipe_config->hw.pipe_mode = pipe_config->hw.adjusted_mode;
> > return 0;
> > }
> >@@ -14820,6 +14889,75 @@ static bool intel_cpu_transcoders_need_modeset(struct intel_atomic_state *state,
> > return false;
> > }
> >+static int intel_atomic_check_bigjoiner(struct intel_atomic_state *state,
> >+ struct intel_crtc *crtc,
> >+ struct intel_crtc_state *old_crtc_state,
> >+ struct intel_crtc_state *new_crtc_state)
> >+{
> >+ struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> >+ struct intel_crtc_state *slave_crtc_state, *master_crtc_state;
> >+ struct intel_crtc *slave, *master;
> >+
> >+ /* slave being enabled, is master is still claiming this crtc? */
> >+ if (old_crtc_state->bigjoiner_slave) {
> >+ slave = crtc;
> >+ master = old_crtc_state->bigjoiner_linked_crtc;
> >+ master_crtc_state = intel_atomic_get_new_crtc_state(state, master);
> >+ if (!master_crtc_state || !needs_modeset(master_crtc_state))
> >+ goto claimed;
> >+ }
> >+
> >+ if (!new_crtc_state->bigjoiner)
> >+ return 0;
> >+
> >+ if (1 + crtc->pipe >= INTEL_NUM_PIPES(dev_priv)) {
> >+ DRM_DEBUG_KMS("[CRTC:%d:%s] Big joiner configuration requires "
> >+ "CRTC + 1 to be used, doesn't exist\n",
> >+ crtc->base.base.id, crtc->base.name);
> >+ return -EINVAL;
> >+ }
> >+
> >+ slave = new_crtc_state->bigjoiner_linked_crtc =
> >+ intel_get_crtc_for_pipe(dev_priv, crtc->pipe + 1);
> >+ slave_crtc_state = intel_atomic_get_crtc_state(&state->base, slave);
> >+ master = crtc;
> >+ if (IS_ERR(slave_crtc_state))
> >+ return PTR_ERR(slave_crtc_state);
> >+
> >+ /* master being enabled, slave was already configured? */
> >+ if (slave_crtc_state->uapi.enable)
> >+ goto claimed;
> >+
> >+ DRM_DEBUG_KMS("[CRTC:%d:%s] Used as slave for big joiner\n",
> >+ slave->base.base.id, slave->base.name);
> >+
> >+ return copy_bigjoiner_crtc_state(slave_crtc_state, new_crtc_state);
> >+
> >+claimed:
> >+ DRM_DEBUG_KMS("[CRTC:%d:%s] Slave is enabled as normal CRTC, but "
> >+ "[CRTC:%d:%s] claiming this CRTC for bigjoiner.\n",
> >+ slave->base.base.id, slave->base.name,
> >+ master->base.base.id, master->base.name);
> >+ return -EINVAL;
> >+}
> >+
> >+static int kill_bigjoiner_slave(struct intel_atomic_state *state,
> >+ struct intel_crtc_state *master_crtc_state)
> >+{
> >+ struct intel_crtc_state *slave_crtc_state =
> >+ intel_atomic_get_crtc_state(&state->base,
> >+ master_crtc_state->bigjoiner_linked_crtc);
> >+
> >+ if (IS_ERR(slave_crtc_state))
> >+ return PTR_ERR(slave_crtc_state);
> >+
> >+ slave_crtc_state->bigjoiner = master_crtc_state->bigjoiner = false;
> >+ slave_crtc_state->bigjoiner_slave = master_crtc_state->bigjoiner_slave = false;
> >+ slave_crtc_state->bigjoiner_linked_crtc = master_crtc_state->bigjoiner_linked_crtc = NULL;
> >+ intel_crtc_copy_uapi_to_hw_state(state, slave_crtc_state);
> >+ return 0;
> >+}
> >+
> > /**
> > * intel_atomic_check - validate state object
> > * @dev: drm device
> >@@ -14849,19 +14987,36 @@ static int intel_atomic_check(struct drm_device *dev,
> > new_crtc_state, i) {
> > if (!needs_modeset(new_crtc_state)) {
> > /* Light copy */
> >- intel_crtc_copy_uapi_to_hw_state_nomodeset(new_crtc_state);
> >+ intel_crtc_copy_uapi_to_hw_state_nomodeset(state, new_crtc_state);
> > continue;
> > }
> >- ret = intel_crtc_prepare_cleared_state(new_crtc_state);
> >+ /* Kill old bigjoiner link, we may re-establish afterwards */
> >+ if (old_crtc_state->bigjoiner && !old_crtc_state->bigjoiner_slave) {
> >+ ret = kill_bigjoiner_slave(state, new_crtc_state);
> >+ if (ret)
> >+ goto fail;
> >+ }
> >+
> >+ if (!new_crtc_state->uapi.enable) {
> >+ if (!new_crtc_state->bigjoiner_slave) {
> >+ intel_crtc_copy_uapi_to_hw_state(state, new_crtc_state);
> >+ any_ms = true;
> >+ }
> >+ continue;
> >+ }
> >+
> >+ ret = intel_crtc_prepare_cleared_state(state, new_crtc_state);
> > if (ret)
> > goto fail;
> >- if (!new_crtc_state->hw.enable)
> >- continue;
> >+ ret = intel_modeset_pipe_config(state, new_crtc_state);
> >+ if (ret)
> >+ goto fail;
> >- ret = intel_modeset_pipe_config(new_crtc_state);
> >+ ret = intel_atomic_check_bigjoiner(state, crtc, old_crtc_state,
> >+ new_crtc_state);
> > if (ret)
> > goto fail;
> > }
> >@@ -15193,7 +15348,9 @@ static void intel_update_crtc(struct intel_atomic_state *state,
> > commit_pipe_config(state, crtc);
> >- if (INTEL_GEN(dev_priv) >= 9)
> >+ if (new_crtc_state->bigjoiner) {
> >+ /* Not supported yet */
> >+ } else if (INTEL_GEN(dev_priv) >= 9)
> > skl_update_planes_on_crtc(state, crtc);
> > else
> > i9xx_update_planes_on_crtc(state, crtc);
> >diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> >index c52c8f42df68..4694cfd90a0a 100644
> >--- a/drivers/gpu/drm/i915/display/intel_display_types.h
> >+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> >@@ -1053,6 +1053,15 @@ struct intel_crtc_state {
> > /* enable pipe csc? */
> > bool csc_enable;
> >+ /* enable pipe big joiner? */
> >+ bool bigjoiner;
> >+
> >+ /* big joiner slave crtc? */
> >+ bool bigjoiner_slave;
> >+
> >+ /* linked crtc for bigjoiner, either slave or master */
> >+ struct intel_crtc *bigjoiner_linked_crtc;
> >+
> > /* Display Stream compression state */
> > struct {
> > bool compression_enable;
> >diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> >index fbfea99fd804..29f45d2206af 100644
> >--- a/drivers/gpu/drm/i915/display/intel_dp.c
> >+++ b/drivers/gpu/drm/i915/display/intel_dp.c
> >@@ -2247,6 +2247,15 @@ static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> > pipe_config->port_clock = intel_dp->common_rates[limits->max_clock];
> > pipe_config->lane_count = limits->max_lane_count;
> >+ if (adjusted_mode->crtc_clock > intel_dp_max_dotclock(intel_dp, false)) {
> >+ if (adjusted_mode->crtc_clock > intel_dp_max_dotclock(intel_dp, true)) {
> >+ DRM_DEBUG_KMS("Clock rate too high for big joiner\n");
> >+ return -EINVAL;
> >+ }
> >+ pipe_config->bigjoiner = true;
> >+ DRM_DEBUG_KMS("Using bigjoiner configuration\n");
> >+ }
> >+
>
> Adding a flag for big-joiner and setting it can be part of previous patch and instead of using true/false directly it can be used in dsc functions. Other changes looks fine to me.
>
> Regards,
> Animesh
>
> > if (intel_dp_is_edp(intel_dp)) {
> > pipe_config->dsc.compressed_bpp =
> > min_t(u16, drm_edp_dsc_sink_output_bpp(intel_dp->dsc_dpcd) >> 4,
> >@@ -2264,12 +2273,12 @@ static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> > pipe_config->lane_count,
> > adjusted_mode->crtc_clock,
> > adjusted_mode->crtc_hdisplay,
> >- false);
> >+ pipe_config->bigjoiner);
> > dsc_dp_slice_count =
> > intel_dp_dsc_get_slice_count(intel_dp,
> > adjusted_mode->crtc_clock,
> > adjusted_mode->crtc_hdisplay,
> >- false);
> >+ pipe_config->bigjoiner);
> > if (!dsc_max_output_bpp || !dsc_dp_slice_count) {
> > drm_dbg_kms(&dev_priv->drm,
> > "Compressed BPP/Slice Count not supported\n");
> >@@ -2285,14 +2294,15 @@ static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> > * is greater than the maximum Cdclock and if slice count is even
> > * then we need to use 2 VDSC instances.
> > */
> >- if (adjusted_mode->crtc_clock > dev_priv->max_cdclk_freq) {
> >- if (pipe_config->dsc.slice_count > 1) {
> >- pipe_config->dsc.dsc_split = true;
> >- } else {
> >+ if (adjusted_mode->crtc_clock > dev_priv->max_cdclk_freq ||
> >+ pipe_config->bigjoiner) {
> >+ if (pipe_config->dsc.slice_count < 2) {
> > drm_dbg_kms(&dev_priv->drm,
> > "Cannot split stream to use 2 VDSC instances\n");
> > return -EINVAL;
> > }
> >+
> >+ pipe_config->dsc.dsc_split = true;
> > }
> > ret = intel_dp_dsc_compute_params(&dig_port->base, pipe_config);
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