[PATCH 02/16] drm/i915/display: Prepare for dsc 3 stream splitter

[Ankit Nautiyal]

At the moment dsc_split represents that dsc splitter is used or not.
With 3 DSC engines, the splitter can split into two num_streams or three
num_streams.

Instead of representing the splitter's state, it is more effective to
represent the number of DSC num_streams per pipe.

Replace the `dsc.dsc_split` member with `dsc.num_streams` to indicate the
number of DSC num_streams used per pipe. This change will implicitly
convey the splitter's operation mode.

v2: Avoid new enum for dsc split. (Suraj)
v3:
-Replace dsc_split with num_stream. (Suraj)
-Avoid extra parentheses. (Jani)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/i915/display/icl_dsi.c           |  4 +++-
 drivers/gpu/drm/i915/display/intel_display.c     |  2 +-
 .../gpu/drm/i915/display/intel_display_types.h   |  2 +-
 drivers/gpu/drm/i915/display/intel_dp.c          |  4 +++-
 drivers/gpu/drm/i915/display/intel_vdsc.c        | 16 +++++++++++-----
 5 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
index 87a27d91d15d..7d5571c39b7e 100644
--- a/drivers/gpu/drm/i915/display/icl_dsi.c
+++ b/drivers/gpu/drm/i915/display/icl_dsi.c
@@ -1595,7 +1595,9 @@ static int gen11_dsi_dsc_compute_config(struct intel_encoder *encoder,
 
 	/* FIXME: split only when necessary */
 	if (crtc_state->dsc.slice_count > 1)
-		crtc_state->dsc.dsc_split = true;
+		crtc_state->dsc.num_streams = 2;
+	else
+		crtc_state->dsc.num_streams = 1;
 
 	/* FIXME: initialize from VBT */
 	vdsc_cfg->rc_model_size = DSC_RC_MODEL_SIZE_CONST;
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index ef1436146325..3dfff0a8c386 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -5741,7 +5741,7 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config,
 	PIPE_CONF_CHECK_I(dsc.config.nsl_bpg_offset);
 
 	PIPE_CONF_CHECK_BOOL(dsc.compression_enable);
-	PIPE_CONF_CHECK_BOOL(dsc.dsc_split);
+	PIPE_CONF_CHECK_I(dsc.num_streams);
 	PIPE_CONF_CHECK_I(dsc.compressed_bpp_x16);
 
 	PIPE_CONF_CHECK_BOOL(splitter.enable);
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 2bb1fa64da2f..5611a4dd6a6f 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1235,7 +1235,7 @@ struct intel_crtc_state {
 	/* Display Stream compression state */
 	struct {
 		bool compression_enable;
-		bool dsc_split;
+		int num_streams;
 		/* Compressed Bpp in U6.4 format (first 4 bits for fractional part) */
 		u16 compressed_bpp_x16;
 		u8 slice_count;
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 286b272aa98c..77487a55280c 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2409,7 +2409,9 @@ int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
 	 * then we need to use 2 VDSC instances.
 	 */
 	if (pipe_config->joiner_pipes || pipe_config->dsc.slice_count > 1)
-		pipe_config->dsc.dsc_split = true;
+		pipe_config->dsc.num_streams = 2;
+	else
+		pipe_config->dsc.num_streams = 1;
 
 	ret = intel_dp_dsc_compute_params(connector, pipe_config);
 	if (ret < 0) {
diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
index 40525f5c4c42..afc40d180dec 100644
--- a/drivers/gpu/drm/i915/display/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
@@ -379,7 +379,7 @@ intel_dsc_power_domain(struct intel_crtc *crtc, enum transcoder cpu_transcoder)
 
 static int intel_dsc_get_vdsc_per_pipe(const struct intel_crtc_state *crtc_state)
 {
-	return crtc_state->dsc.dsc_split ? 2 : 1;
+	return crtc_state->dsc.num_streams;
 }
 
 int intel_dsc_get_num_vdsc_instances(const struct intel_crtc_state *crtc_state)
@@ -976,8 +976,14 @@ void intel_dsc_get_config(struct intel_crtc_state *crtc_state)
 	if (!crtc_state->dsc.compression_enable)
 		goto out;
 
-	crtc_state->dsc.dsc_split = (dss_ctl2 & RIGHT_BRANCH_VDSC_ENABLE) &&
-		(dss_ctl1 & JOINER_ENABLE);
+	if (dss_ctl1 & JOINER_ENABLE) {
+		if (dss_ctl2 & RIGHT_BRANCH_VDSC_ENABLE)
+			crtc_state->dsc.num_streams = 2;
+		else
+			crtc_state->dsc.num_streams = 1;
+	} else {
+		crtc_state->dsc.num_streams = 0;
+	}
 
 	intel_dsc_get_pps_config(crtc_state);
 out:
@@ -988,10 +994,10 @@ static void intel_vdsc_dump_state(struct drm_printer *p, int indent,
 				  const struct intel_crtc_state *crtc_state)
 {
 	drm_printf_indent(p, indent,
-			  "dsc-dss: compressed-bpp:" FXP_Q4_FMT ", slice-count: %d, split: %s\n",
+			  "dsc-dss: compressed-bpp:" FXP_Q4_FMT ", slice-count: %d, num_streams: %d\n",
 			  FXP_Q4_ARGS(crtc_state->dsc.compressed_bpp_x16),
 			  crtc_state->dsc.slice_count,
-			  str_yes_no(crtc_state->dsc.dsc_split));
+			  crtc_state->dsc.num_streams);
 }
 
 void intel_vdsc_state_dump(struct drm_printer *p, int indent,
-- 
2.45.2