linux-kernel - [PATCH v1 4/5] drm/msm/dpu: calculate DSC encoder parameters dynamically

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Message-ID: <1682033114-28483-5-git-send-email-quic_khsieh@quicinc.com>
Date:   Thu, 20 Apr 2023 16:25:13 -0700
From:   Kuogee Hsieh <quic_khsieh@...cinc.com>
To:     <dri-devel@...ts.freedesktop.org>, <robdclark@...il.com>,
        <sean@...rly.run>, <swboyd@...omium.org>, <dianders@...omium.org>,
        <vkoul@...nel.org>, <daniel@...ll.ch>, <airlied@...il.com>,
        <agross@...nel.org>, <dmitry.baryshkov@...aro.org>,
        <andersson@...nel.org>
CC:     Kuogee Hsieh <quic_khsieh@...cinc.com>,
        <quic_abhinavk@...cinc.com>, <quic_sbillaka@...cinc.com>,
        <marijn.suijten@...ainline.org>, <freedreno@...ts.freedesktop.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v1 4/5] drm/msm/dpu: calculate DSC encoder parameters dynamically

During DSC preparation, add run time calculation to figure out what
usage modes, split mode and merge mode, is going to be setup.

Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 56 ++++++++++++++++-------------
 1 file changed, 32 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 2fdacf1..5677728 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -529,17 +529,9 @@ void dpu_encoder_helper_split_config(
 bool dpu_encoder_use_dsc_merge(struct drm_encoder *drm_enc)
 {
 	struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
-	int i, intf_count = 0, num_dsc = 0;
+	struct msm_display_topology *topology = &dpu_enc->topology;
 
-	for (i = 0; i < MAX_PHYS_ENCODERS_PER_VIRTUAL; i++)
-		if (dpu_enc->phys_encs[i])
-			intf_count++;
-
-	/* See dpu_encoder_get_topology, we only support 2:2:1 topology */
-	if (dpu_enc->dsc)
-		num_dsc = 2;
-
-	return (num_dsc > 0) && (num_dsc > intf_count);
+	return (topology->num_dsc > topology->num_intf);
 }
 
 static void dpu_encoder_get_topology(
@@ -1861,41 +1853,57 @@ static void dpu_encoder_prep_dsc(struct dpu_encoder_virt *dpu_enc,
 	struct dpu_encoder_phys *enc_master = dpu_enc->cur_master;
 	struct dpu_hw_dsc *hw_dsc[MAX_CHANNELS_PER_ENC];
 	struct dpu_hw_pingpong *hw_pp[MAX_CHANNELS_PER_ENC];
+	struct msm_display_topology *topology = &dpu_enc->topology;
 	int this_frame_slices;
 	int intf_ip_w, enc_ip_w;
-	int dsc_common_mode;
+	int dsc_common_mode = 0;
 	int pic_width;
 	u32 initial_lines;
+	int num_dsc, num_intf;
 	int i;
 
 	for (i = 0; i < MAX_CHANNELS_PER_ENC; i++) {
 		hw_pp[i] = dpu_enc->hw_pp[i];
 		hw_dsc[i] = dpu_enc->hw_dsc[i];
-
-		if (!hw_pp[i] || !hw_dsc[i]) {
-			DPU_ERROR_ENC(dpu_enc, "invalid params for DSC\n");
-			return;
-		}
 	}
 
-	dsc_common_mode = 0;
+	num_dsc = topology->num_dsc;
+	num_intf = topology->num_intf;
+
 	pic_width = dsc->pic_width;
 
-	dsc_common_mode = DSC_MODE_MULTIPLEX | DSC_MODE_SPLIT_PANEL;
 	if (enc_master->intf_mode == INTF_MODE_VIDEO)
 		dsc_common_mode |= DSC_MODE_VIDEO;
 
+	/*
+	 * If this encoder is driving more than one DSC encoder, they
+	 * operate in tandem, same pic dimension needs to be used by
+	 * each of them.(pp-split is assumed to be not supported)
+	 *
+	 */
+
 	this_frame_slices = pic_width / dsc->slice_width;
 	intf_ip_w = this_frame_slices * dsc->slice_width;
+	enc_ip_w = intf_ip_w;
+
+	intf_ip_w /= num_intf;
+
+	if (num_dsc > 1)
+		dsc_common_mode |= DSC_MODE_SPLIT_PANEL;
+
+	if (dpu_encoder_use_dsc_merge(&dpu_enc->base)) {
+		dsc_common_mode |= DSC_MODE_MULTIPLEX;
+		/*
+		 * in dsc merge case: when using 2 encoders for the same
+		 * stream, no. of slices need to be same on both the
+		 * encoders.
+		 */
+		enc_ip_w = intf_ip_w / 2;
+	}
 
-	/*
-	 * dsc merge case: when using 2 encoders for the same stream,
-	 * no. of slices need to be same on both the encoders.
-	 */
-	enc_ip_w = intf_ip_w / 2;
 	initial_lines = dpu_encoder_dsc_initial_line_calc(dsc, enc_ip_w);
 
-	for (i = 0; i < MAX_CHANNELS_PER_ENC; i++)
+	for (i = 0; i < num_dsc; i++)
 		dpu_encoder_dsc_pipe_cfg(dpu_enc, hw_dsc[i], hw_pp[i], dsc,
 					dsc_common_mode, initial_lines);
 }
-- 
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