From:   Kuogee Hsieh <quic_khsieh@quicinc.com>
To:     <dri-devel@lists.freedesktop.org>, <robdclark@gmail.com>,
        <sean@poorly.run>, <swboyd@chromium.org>, <dianders@chromium.org>,
        <vkoul@kernel.org>, <daniel@ffwll.ch>, <airlied@gmail.com>,
        <agross@kernel.org>, <dmitry.baryshkov@linaro.org>,
        <andersson@kernel.org>
CC:     Kuogee Hsieh <quic_khsieh@quicinc.com>,
        <quic_abhinavk@quicinc.com>, <quic_sbillaka@quicinc.com>,
        <marijn.suijten@somainline.org>, <freedreno@lists.freedesktop.org>,
        <linux-arm-msm@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [RFC PATCH 1/2] drm/msm/dpu: add dsc helper functions
Date:   Fri, 24 Feb 2023 11:40:46 -0800
Message-ID: <1677267647-28672-2-git-send-email-quic_khsieh@quicinc.com>
In-Reply-To: <1677267647-28672-1-git-send-email-quic_khsieh@quicinc.com>
References: <1677267647-28672-1-git-send-email-quic_khsieh@quicinc.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

Add DSC helper functions based on DSC configuration profiles to produce
DSC related runtime parameters through both table look up and runtime
calculation to support DSC on DPU.

There are 6 different DSC configuration profiles are supported currently.
DSC configuration profiles are differiented by 5 keys, DSC version (V1.1),
chroma (444/422/420), colorspace (RGB/YUV), bpc(8/10),
bpp (6/7/7.5/8/9/10/12/15) and SCR (0/1).

Only DSC version V1.1 added and V1.2 will be added later.

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
---
 drivers/gpu/drm/msm/Makefile                   |   1 +
 drivers/gpu/drm/msm/disp/dpu1/dpu_dsc_helper.c | 209 +++++++++++++++++++++++++
 drivers/gpu/drm/msm/disp/dpu1/dpu_dsc_helper.h |  34 ++++
 3 files changed, 244 insertions(+)
 create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_dsc_helper.c
 create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_dsc_helper.h

diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile
index 7274c412..28cf52b 100644
--- a/drivers/gpu/drm/msm/Makefile
+++ b/drivers/gpu/drm/msm/Makefile
@@ -65,6 +65,7 @@ msm-$(CONFIG_DRM_MSM_DPU) += \
 	disp/dpu1/dpu_hw_catalog.o \
 	disp/dpu1/dpu_hw_ctl.o \
 	disp/dpu1/dpu_hw_dsc.o \
+	disp/dpu1/dpu_dsc_helper.o \
 	disp/dpu1/dpu_hw_interrupts.o \
 	disp/dpu1/dpu_hw_intf.o \
 	disp/dpu1/dpu_hw_lm.o \
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_dsc_helper.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_dsc_helper.c
new file mode 100644
index 00000000..88207e9
--- /dev/null
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_dsc_helper.c
@@ -0,0 +1,209 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023. Qualcomm Innovation Center, Inc. All rights reserved
+ */
+
+#include <drm/display/drm_dsc_helper.h>
+#include "msm_drv.h"
+#include "dpu_kms.h"
+#include "dpu_hw_dsc.h"
+#include "dpu_dsc_helper.h"
+
+
+#define DPU_DSC_PPS_SIZE       128
+
+enum dpu_dsc_ratio_type {
+	DSC_V11_8BPC_8BPP,
+	DSC_V11_10BPC_8BPP,
+	DSC_V11_10BPC_10BPP,
+	DSC_V11_SCR1_8BPC_8BPP,
+	DSC_V11_SCR1_10BPC_8BPP,
+	DSC_V11_SCR1_10BPC_10BPP,
+	DSC_RATIO_TYPE_MAX
+};
+
+
+static u16 dpu_dsc_rc_buf_thresh[DSC_NUM_BUF_RANGES - 1] = {
+		0x0e, 0x1c, 0x2a, 0x38, 0x46, 0x54,
+		0x62, 0x69, 0x70, 0x77, 0x79, 0x7b, 0x7d, 0x7e
+};
+
+/*
+ * Rate control - Min QP values for each ratio type in dpu_dsc_ratio_type
+ */
+static char dpu_dsc_rc_range_min_qp[DSC_RATIO_TYPE_MAX][DSC_NUM_BUF_RANGES] = {
+	/* DSC v1.1 */
+	{0, 0, 1, 1, 3, 3, 3, 3, 3, 3, 5, 5, 5, 7, 13},
+	{0, 4, 5, 5, 7, 7, 7, 7, 7, 7, 9, 9, 9, 11, 17},
+	{0, 4, 5, 6, 7, 7, 7, 7, 7, 7, 9, 9, 9, 11, 15},
+	/* DSC v1.1 SCR and DSC v1.2 RGB 444 */
+	{0, 0, 1, 1, 3, 3, 3, 3, 3, 3, 5, 5, 5, 9, 12},
+	{0, 4, 5, 5, 7, 7, 7, 7, 7, 7, 9, 9, 9, 13, 16},
+	{0, 4, 5, 6, 7, 7, 7, 7, 7, 7, 9, 9, 9, 11, 15},
+};
+
+/*
+ * Rate control - Max QP values for each ratio type in dpu_dsc_ratio_type
+ */
+static char dpu_dsc_rc_range_max_qp[DSC_RATIO_TYPE_MAX][DSC_NUM_BUF_RANGES] = {
+	/* DSC v1.1 */
+	{4, 4, 5, 6, 7, 7, 7, 8, 9, 10, 11, 12, 13, 13, 15},
+	{4, 8, 9, 10, 11, 11, 11, 12, 13, 14, 15, 16, 17, 17, 19},
+	{7, 8, 9, 10, 11, 11, 11, 12, 13, 13, 14, 14, 15, 15, 16},
+	/* DSC v1.1 SCR and DSC v1.2 RGB 444 */
+	{4, 4, 5, 6, 7, 7, 7, 8, 9, 10, 10, 11, 11, 12, 13},
+	{8, 8, 9, 10, 11, 11, 11, 12, 13, 14, 14, 15, 15, 16, 17},
+	{7, 8, 9, 10, 11, 11, 11, 12, 13, 13, 14, 14, 15, 15, 16},
+};
+
+/*
+ * Rate control - bpg offset values for each ratio type in dpu_dsc_ratio_type
+ */
+static char dpu_dsc_rc_range_bpg[DSC_RATIO_TYPE_MAX][DSC_NUM_BUF_RANGES] = {
+	/* DSC v1.1 */
+	{2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12},
+	{2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12},
+	{2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12},
+	/* DSC v1.1 SCR and DSC V1.2 RGB 444 */
+	{2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12},
+	{2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12},
+	{2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12},
+};
+
+static struct dpu_dsc_rc_init_params_lut {
+	u32 rc_quant_incr_limit0;
+	u32 rc_quant_incr_limit1;
+	u32 initial_fullness_offset;
+	u32 initial_xmit_delay;
+	u32 second_line_bpg_offset;
+	u32 second_line_offset_adj;
+	u32 flatness_min_qp;
+	u32 flatness_max_qp;
+}  dpu_dsc_rc_init_param_lut[] = {
+	/* DSC v1.1 */
+	{11, 11, 6144, 512, 0, 0, 3, 12}, /* DSC_V11_8BPC_8BPP */
+	{15, 15, 6144, 512, 0, 0, 7, 16}, /* DSC_V11_10BPC_8BPP */
+	{15, 15, 5632, 410, 0, 0, 7, 16}, /* DSC_V11_10BPC_10BPP */
+	/* DSC v1.1 SCR and DSC v1.2 RGB 444 */
+	{11, 11, 6144, 512, 0, 0, 3, 12}, /* DSC_V12_444_8BPC_8BPP or DSC_V11_SCR1_8BPC_8BPP */
+	{15, 15, 6144, 512, 0, 0, 7, 16}, /* DSC_V12_444_10BPC_8BPP or DSC_V11_SCR1_10BPC_8BPP */
+	{15, 15, 5632, 410, 0, 0, 7, 16}, /* DSC_V12_444_10BPC_10BPP or DSC_V11_SCR1_10BPC_10BPP */
+};
+
+/**
+ * Maps to lookup the dpu_dsc_ratio_type index used in rate control tables
+ */
+static struct dpu_dsc_table_index_lut {
+	u32 fmt;
+	u32 scr_ver;
+	u32 minor_ver;
+	u32 bpc;
+	u32 bpp;
+	u32 type;
+} dpu_dsc_index_map[] = {
+	/* DSC 1.1 formats - scr version is considered */
+	{DPU_DSC_CHROMA_444, 0, 1, 8, 8, DSC_V11_8BPC_8BPP},
+	{DPU_DSC_CHROMA_444, 0, 1, 10, 8, DSC_V11_10BPC_8BPP},
+	{DPU_DSC_CHROMA_444, 0, 1, 10, 10, DSC_V11_10BPC_10BPP},
+	{DPU_DSC_CHROMA_444, 1, 1, 8, 8, DSC_V11_SCR1_8BPC_8BPP},
+	{DPU_DSC_CHROMA_444, 1, 1, 10, 8, DSC_V11_SCR1_10BPC_8BPP},
+	{DPU_DSC_CHROMA_444, 1, 1, 10, 10, DSC_V11_SCR1_10BPC_10BPP},
+};
+
+static int _get_rc_table_index(struct drm_dsc_config *dsc, int scr_ver)
+{
+	u32 bpp, bpc, i, fmt = DPU_DSC_CHROMA_444;
+
+	if (dsc->dsc_version_major != 0x1) {
+		DPU_ERROR("unsupported major version %d\n",
+				dsc->dsc_version_major);
+		return -EINVAL;
+	}
+
+	bpc = dsc->bits_per_component;
+	bpp = DSC_BPP(*dsc);
+
+	if (dsc->native_422)
+		fmt = DPU_DSC_CHROMA_422;
+	else if (dsc->native_420)
+		fmt = DPU_DSC_CHROMA_420;
+
+
+	for (i = 0; i < ARRAY_SIZE(dpu_dsc_index_map); i++) {
+		if (dsc->dsc_version_minor == dpu_dsc_index_map[i].minor_ver &&
+				fmt ==  dpu_dsc_index_map[i].fmt &&
+				bpc == dpu_dsc_index_map[i].bpc &&
+				bpp == dpu_dsc_index_map[i].bpp &&
+				(dsc->dsc_version_minor != 0x1 ||
+					scr_ver == dpu_dsc_index_map[i].scr_ver))
+			return dpu_dsc_index_map[i].type;
+	}
+
+	DPU_ERROR("unsupported DSC v%d.%dr%d, bpc:%d, bpp:%d, fmt:0x%x\n",
+			dsc->dsc_version_major, dsc->dsc_version_minor,
+			scr_ver, bpc, bpp, fmt);
+	return -EINVAL;
+}
+
+int dpu_dsc_populate_dsc_config(struct drm_dsc_config *dsc, int scr_ver)
+{
+	int bpp, bpc;
+	struct dpu_dsc_rc_init_params_lut *rc_param_lut;
+	int i, ratio_idx;
+
+	dsc->rc_model_size = 8192;
+
+	if ((dsc->dsc_version_major == 0x1) &&
+			(dsc->dsc_version_minor == 0x1)) {
+		if (scr_ver == 0x1)
+			dsc->first_line_bpg_offset = 15;
+		else
+			dsc->first_line_bpg_offset = 12;
+	}
+
+	dsc->rc_edge_factor = 6;
+	dsc->rc_tgt_offset_high = 3;
+	dsc->rc_tgt_offset_low = 3;
+	dsc->simple_422 = 0;
+	dsc->convert_rgb = !(dsc->native_422 | dsc->native_420);
+	dsc->vbr_enable = 0;
+
+	bpp = DSC_BPP(*dsc);
+	bpc = dsc->bits_per_component;
+
+	ratio_idx = _get_rc_table_index(dsc, scr_ver);
+	if ((ratio_idx < 0) || (ratio_idx >= DSC_RATIO_TYPE_MAX))
+		return -EINVAL;
+
+
+	for (i = 0; i < DSC_NUM_BUF_RANGES - 1; i++)
+		dsc->rc_buf_thresh[i] = dpu_dsc_rc_buf_thresh[i];
+
+	for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
+		dsc->rc_range_params[i].range_min_qp =
+			dpu_dsc_rc_range_min_qp[ratio_idx][i];
+		dsc->rc_range_params[i].range_max_qp =
+			dpu_dsc_rc_range_max_qp[ratio_idx][i];
+		dsc->rc_range_params[i].range_bpg_offset =
+			dpu_dsc_rc_range_bpg[ratio_idx][i];
+	}
+
+	rc_param_lut = &dpu_dsc_rc_init_param_lut[ratio_idx];
+	dsc->rc_quant_incr_limit0 = rc_param_lut->rc_quant_incr_limit0;
+	dsc->rc_quant_incr_limit1 = rc_param_lut->rc_quant_incr_limit1;
+	dsc->initial_offset = rc_param_lut->initial_fullness_offset;
+	dsc->initial_xmit_delay = rc_param_lut->initial_xmit_delay;
+	dsc->second_line_bpg_offset = rc_param_lut->second_line_bpg_offset;
+	dsc->second_line_offset_adj = rc_param_lut->second_line_offset_adj;
+	dsc->flatness_min_qp = rc_param_lut->flatness_min_qp;
+	dsc->flatness_max_qp = rc_param_lut->flatness_max_qp;
+
+
+	dsc->line_buf_depth = bpc + 1;
+	dsc->mux_word_size = bpc > 10 ? DSC_MUX_WORD_SIZE_12_BPC : DSC_MUX_WORD_SIZE_8_10_BPC;
+
+	dsc->initial_scale_value = 8 * dsc->rc_model_size /
+			(dsc->rc_model_size - dsc->initial_offset);
+
+        return drm_dsc_compute_rc_parameters(dsc);
+}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_dsc_helper.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_dsc_helper.h
new file mode 100644
index 00000000..4a23e02
--- /dev/null
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_dsc_helper.h
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023. Qualcomm Innovation Center, Inc. All rights reserved
+ */
+
+#ifndef __DPU_DSC_HELPER_H__
+#define __DPU_DSC_HELPER_H__
+
+#include "msm_drv.h"
+
+#define DSC_1_1_PPS_PARAMETER_SET_ELEMENTS   88
+
+/**
+ * Bits/pixel target >> 4  (removing the fractional bits)
+ * returns the integer bpp value from the drm_dsc_config struct
+ */
+#define DSC_BPP(config) ((config).bits_per_pixel >> 4)
+
+enum dpu_dsc_chroma {
+	DPU_DSC_CHROMA_444,
+	DPU_DSC_CHROMA_422,
+	DPU_DSC_CHROMA_420,
+};
+
+int dpu_dsc_populate_dsc_config(struct drm_dsc_config *dsc, int scr_ver);
+
+bool dpu_dsc_ich_reset_override_needed(bool pu_en, struct drm_dsc_config *dsc);
+
+int dpu_dsc_initial_line_calc( u32 num_active_ss_per_enc,
+				struct drm_dsc_config *dsc,
+				int enc_ip_width, int dsc_cmn_mode);
+
+#endif /* __DPU_DSC_HELPER_H__ */
+
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project