drm/msm/dpu: add dpu_hw_cdm abstraction for CDM block

CDM block comes with its own set of registers and operations
which can be done. In-line with other hardware blocks, this
change adds the dpu_hw_cdm abstraction for the CDM block.

changes in v4:
	- used FIELD_PREP() for dpu_hw_cdm_setup_cdwn() operations
	- change to lowercase hex in dpu_hw_cdm_bind_pingpong_blk()
	- move disable assignment inside else in dpu_hw_cdm_bind_pingpong_blk()

changes in v3:
	- fix commit text from sub-blk to blk for CDM
	- fix kbot issue for missing static for dpu_hw_cdm_enable()
	- fix kbot issue for incorrect documentation style
	- add more documentation for enums and struct in dpu_hw_cdm.h
	- drop "enable" parameter from bind_pingpong_blk() as we can
	  just use PINGPONG_NONE for disable cases
	- drop unnecessary bit operation for zero value of cdm_cfg

changes in v2:
	- replace bit magic with relevant defines
	- use drmm_kzalloc instead of kzalloc/free
	- some formatting fixes
	- inline _setup_cdm_ops()
	- protect bind_pingpong_blk with core_rev check
	- drop setup_csc_data() and setup_cdwn() ops as they
	  are merged into enable()

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202312101815.B3ZH7Pfy-lkp@intel.com/
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/571824/
Link: https://lore.kernel.org/r/20231212205254.12422-8-quic_abhinavk@quicinc.com
[DB: Added linux/bitfield.h inclusion]
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

1 files changed, 247 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c
new file mode 100644
index 000000000000..e9cdc7934a49
--- /dev/null
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c
@@ -0,0 +1,247 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/bitfield.h>
+
+#include <drm/drm_managed.h>
+
+#include "dpu_hw_mdss.h"
+#include "dpu_hw_util.h"
+#include "dpu_hw_catalog.h"
+#include "dpu_hw_cdm.h"
+#include "dpu_kms.h"
+
+#define CDM_CSC_10_OPMODE                  0x000
+#define CDM_CSC_10_BASE                    0x004
+
+#define CDM_CDWN2_OP_MODE                  0x100
+#define CDM_CDWN2_CLAMP_OUT                0x104
+#define CDM_CDWN2_PARAMS_3D_0              0x108
+#define CDM_CDWN2_PARAMS_3D_1              0x10C
+#define CDM_CDWN2_COEFF_COSITE_H_0         0x110
+#define CDM_CDWN2_COEFF_COSITE_H_1         0x114
+#define CDM_CDWN2_COEFF_COSITE_H_2         0x118
+#define CDM_CDWN2_COEFF_OFFSITE_H_0        0x11C
+#define CDM_CDWN2_COEFF_OFFSITE_H_1        0x120
+#define CDM_CDWN2_COEFF_OFFSITE_H_2        0x124
+#define CDM_CDWN2_COEFF_COSITE_V           0x128
+#define CDM_CDWN2_COEFF_OFFSITE_V          0x12C
+#define CDM_CDWN2_OUT_SIZE                 0x130
+
+#define CDM_HDMI_PACK_OP_MODE              0x200
+#define CDM_CSC_10_MATRIX_COEFF_0          0x004
+
+#define CDM_MUX                            0x224
+
+/* CDM CDWN2 sub-block bit definitions */
+#define CDM_CDWN2_OP_MODE_EN                  BIT(0)
+#define CDM_CDWN2_OP_MODE_ENABLE_H            BIT(1)
+#define CDM_CDWN2_OP_MODE_ENABLE_V            BIT(2)
+#define CDM_CDWN2_OP_MODE_BITS_OUT_8BIT       BIT(7)
+#define CDM_CDWN2_V_PIXEL_METHOD_MASK         GENMASK(6, 5)
+#define CDM_CDWN2_H_PIXEL_METHOD_MASK         GENMASK(4, 3)
+
+/* CDM CSC10 sub-block bit definitions */
+#define CDM_CSC10_OP_MODE_EN               BIT(0)
+#define CDM_CSC10_OP_MODE_SRC_FMT_YUV      BIT(1)
+#define CDM_CSC10_OP_MODE_DST_FMT_YUV      BIT(2)
+
+/* CDM HDMI pack sub-block bit definitions */
+#define CDM_HDMI_PACK_OP_MODE_EN           BIT(0)
+
+/*
+ * Horizontal coefficients for cosite chroma downscale
+ * s13 representation of coefficients
+ */
+static u32 cosite_h_coeff[] = {0x00000016, 0x000001cc, 0x0100009e};
+
+/*
+ * Horizontal coefficients for offsite chroma downscale
+ */
+static u32 offsite_h_coeff[] = {0x000b0005, 0x01db01eb, 0x00e40046};
+
+/*
+ * Vertical coefficients for cosite chroma downscale
+ */
+static u32 cosite_v_coeff[] = {0x00080004};
+/*
+ * Vertical coefficients for offsite chroma downscale
+ */
+static u32 offsite_v_coeff[] = {0x00060002};
+
+static int dpu_hw_cdm_setup_cdwn(struct dpu_hw_cdm *ctx, struct dpu_hw_cdm_cfg *cfg)
+{
+	struct dpu_hw_blk_reg_map *c = &ctx->hw;
+	u32 opmode;
+	u32 out_size;
+
+	switch (cfg->h_cdwn_type) {
+	case CDM_CDWN_DISABLE:
+		opmode = 0;
+		break;
+	case CDM_CDWN_PIXEL_DROP:
+		opmode = CDM_CDWN2_OP_MODE_ENABLE_H |
+				FIELD_PREP(CDM_CDWN2_H_PIXEL_METHOD_MASK,
+					   CDM_CDWN2_METHOD_PIXEL_DROP);
+		break;
+	case CDM_CDWN_AVG:
+		opmode = CDM_CDWN2_OP_MODE_ENABLE_H |
+				FIELD_PREP(CDM_CDWN2_H_PIXEL_METHOD_MASK,
+					   CDM_CDWN2_METHOD_AVG);
+		break;
+	case CDM_CDWN_COSITE:
+		opmode = CDM_CDWN2_OP_MODE_ENABLE_H |
+				FIELD_PREP(CDM_CDWN2_H_PIXEL_METHOD_MASK,
+					   CDM_CDWN2_METHOD_COSITE);
+		DPU_REG_WRITE(c, CDM_CDWN2_COEFF_COSITE_H_0,
+			      cosite_h_coeff[0]);
+		DPU_REG_WRITE(c, CDM_CDWN2_COEFF_COSITE_H_1,
+			      cosite_h_coeff[1]);
+		DPU_REG_WRITE(c, CDM_CDWN2_COEFF_COSITE_H_2,
+			      cosite_h_coeff[2]);
+		break;
+	case CDM_CDWN_OFFSITE:
+		opmode = CDM_CDWN2_OP_MODE_ENABLE_H |
+				FIELD_PREP(CDM_CDWN2_H_PIXEL_METHOD_MASK, CDM_CDWN2_METHOD_OFFSITE);
+		DPU_REG_WRITE(c, CDM_CDWN2_COEFF_OFFSITE_H_0,
+			      offsite_h_coeff[0]);
+		DPU_REG_WRITE(c, CDM_CDWN2_COEFF_OFFSITE_H_1,
+			      offsite_h_coeff[1]);
+		DPU_REG_WRITE(c, CDM_CDWN2_COEFF_OFFSITE_H_2,
+			      offsite_h_coeff[2]);
+		break;
+	default:
+		DPU_ERROR("%s invalid horz down sampling type\n", __func__);
+		return -EINVAL;
+	}
+
+	switch (cfg->v_cdwn_type) {
+	case CDM_CDWN_DISABLE:
+		/* if its only Horizontal downsample, we dont need to do anything here */
+		break;
+	case CDM_CDWN_PIXEL_DROP:
+		opmode |= CDM_CDWN2_OP_MODE_ENABLE_V |
+				FIELD_PREP(CDM_CDWN2_V_PIXEL_METHOD_MASK,
+					   CDM_CDWN2_METHOD_PIXEL_DROP);
+		break;
+	case CDM_CDWN_AVG:
+		opmode |= CDM_CDWN2_OP_MODE_ENABLE_V |
+				FIELD_PREP(CDM_CDWN2_V_PIXEL_METHOD_MASK,
+					   CDM_CDWN2_METHOD_AVG);
+		break;
+	case CDM_CDWN_COSITE:
+		opmode |= CDM_CDWN2_OP_MODE_ENABLE_V |
+				FIELD_PREP(CDM_CDWN2_V_PIXEL_METHOD_MASK,
+					   CDM_CDWN2_METHOD_COSITE);
+		DPU_REG_WRITE(c,
+			      CDM_CDWN2_COEFF_COSITE_V,
+			      cosite_v_coeff[0]);
+		break;
+	case CDM_CDWN_OFFSITE:
+		opmode |= CDM_CDWN2_OP_MODE_ENABLE_V |
+				FIELD_PREP(CDM_CDWN2_V_PIXEL_METHOD_MASK,
+					   CDM_CDWN2_METHOD_OFFSITE);
+		DPU_REG_WRITE(c,
+			      CDM_CDWN2_COEFF_OFFSITE_V,
+			      offsite_v_coeff[0]);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (cfg->output_bit_depth != CDM_CDWN_OUTPUT_10BIT)
+		opmode |= CDM_CDWN2_OP_MODE_BITS_OUT_8BIT;
+
+	if (cfg->v_cdwn_type || cfg->h_cdwn_type)
+		opmode |= CDM_CDWN2_OP_MODE_EN; /* EN CDWN module */
+	else
+		opmode &= ~CDM_CDWN2_OP_MODE_EN;
+
+	out_size = (cfg->output_width & 0xFFFF) | ((cfg->output_height & 0xFFFF) << 16);
+	DPU_REG_WRITE(c, CDM_CDWN2_OUT_SIZE, out_size);
+	DPU_REG_WRITE(c, CDM_CDWN2_OP_MODE, opmode);
+	DPU_REG_WRITE(c, CDM_CDWN2_CLAMP_OUT, ((0x3FF << 16) | 0x0));
+
+	return 0;
+}
+
+static int dpu_hw_cdm_enable(struct dpu_hw_cdm *ctx, struct dpu_hw_cdm_cfg *cdm)
+{
+	struct dpu_hw_blk_reg_map *c = &ctx->hw;
+	const struct dpu_format *fmt;
+	u32 opmode = 0;
+	u32 csc = 0;
+
+	if (!ctx || !cdm)
+		return -EINVAL;
+
+	fmt = cdm->output_fmt;
+
+	if (!DPU_FORMAT_IS_YUV(fmt))
+		return -EINVAL;
+
+	dpu_hw_csc_setup(&ctx->hw, CDM_CSC_10_MATRIX_COEFF_0, cdm->csc_cfg, true);
+	dpu_hw_cdm_setup_cdwn(ctx, cdm);
+
+	if (cdm->output_type == CDM_CDWN_OUTPUT_HDMI) {
+		if (fmt->chroma_sample != DPU_CHROMA_H1V2)
+			return -EINVAL; /*unsupported format */
+		opmode = CDM_HDMI_PACK_OP_MODE_EN;
+		opmode |= (fmt->chroma_sample << 1);
+	}
+
+	csc |= CDM_CSC10_OP_MODE_DST_FMT_YUV;
+	csc &= ~CDM_CSC10_OP_MODE_SRC_FMT_YUV;
+	csc |= CDM_CSC10_OP_MODE_EN;
+
+	if (ctx && ctx->ops.bind_pingpong_blk)
+		ctx->ops.bind_pingpong_blk(ctx, cdm->pp_id);
+
+	DPU_REG_WRITE(c, CDM_CSC_10_OPMODE, csc);
+	DPU_REG_WRITE(c, CDM_HDMI_PACK_OP_MODE, opmode);
+	return 0;
+}
+
+static void dpu_hw_cdm_bind_pingpong_blk(struct dpu_hw_cdm *ctx, const enum dpu_pingpong pp)
+{
+	struct dpu_hw_blk_reg_map *c;
+	int mux_cfg;
+
+	c = &ctx->hw;
+
+	mux_cfg = DPU_REG_READ(c, CDM_MUX);
+	mux_cfg &= ~0xf;
+
+	if (pp)
+		mux_cfg |= (pp - PINGPONG_0) & 0x7;
+	else
+		mux_cfg |= 0xf;
+
+	DPU_REG_WRITE(c, CDM_MUX, mux_cfg);
+}
+
+struct dpu_hw_cdm *dpu_hw_cdm_init(struct drm_device *dev,
+				   const struct dpu_cdm_cfg *cfg, void __iomem *addr,
+				   const struct dpu_mdss_version *mdss_rev)
+{
+	struct dpu_hw_cdm *c;
+
+	c = drmm_kzalloc(dev, sizeof(*c), GFP_KERNEL);
+	if (!c)
+		return ERR_PTR(-ENOMEM);
+
+	c->hw.blk_addr = addr + cfg->base;
+	c->hw.log_mask = DPU_DBG_MASK_CDM;
+
+	/* Assign ops */
+	c->idx = cfg->id;
+	c->caps = cfg;
+
+	c->ops.enable = dpu_hw_cdm_enable;
+	if (mdss_rev->core_major_ver >= 5)
+		c->ops.bind_pingpong_blk = dpu_hw_cdm_bind_pingpong_blk;
+
+	return c;
+}