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

[Ankit Nautiyal]

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

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

Replace the `dsc.dsc_split` member with `dsc.num_streams` to indicate the
number of DSC 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