Re: [PATCH v3 07/15] drm/msm/dpu: add dpu_hw_cdm abstraction for CDM block

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On Tue, 12 Dec 2023 at 02:23, Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx> wrote:
>
> 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 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@xxxxxxxxx>
> Closes: https://lore.kernel.org/oe-kbuild-all/202312101815.B3ZH7Pfy-lkp@xxxxxxxxx/
> Signed-off-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
> ---
>  drivers/gpu/drm/msm/Makefile                |   1 +
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c  | 263 ++++++++++++++++++++
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.h  | 130 ++++++++++
>  drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h |   1 +
>  4 files changed, 395 insertions(+)
>  create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c
>  create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.h
>
> diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile
> index 49671364fdcf..b1173128b5b9 100644
> --- a/drivers/gpu/drm/msm/Makefile
> +++ b/drivers/gpu/drm/msm/Makefile
> @@ -63,6 +63,7 @@ msm-$(CONFIG_DRM_MSM_DPU) += \
>         disp/dpu1/dpu_encoder_phys_wb.o \
>         disp/dpu1/dpu_formats.o \
>         disp/dpu1/dpu_hw_catalog.o \
> +       disp/dpu1/dpu_hw_cdm.o \
>         disp/dpu1/dpu_hw_ctl.o \
>         disp/dpu1/dpu_hw_dsc.o \
>         disp/dpu1/dpu_hw_dsc_1_2.o \
> 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..4976f8a05ce7
> --- /dev/null
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c
> @@ -0,0 +1,263 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2023, The Linux Foundation. All rights reserved.
> + */
> +
> +#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_METHOD_H_AVG        BIT(3)
> +#define CDM_CDWN2_OP_MODE_METHOD_H_COSITE     BIT(4)
> +#define CDM_CDWN2_OP_MODE_METHOD_V_AVG        BIT(5)
> +#define CDM_CDWN2_OP_MODE_METHOD_V_COSITE     BIT(6)
> +#define CDM_CDWN2_OP_MODE_BITS_OUT_8BIT       BIT(7)
> +#define CDM_CDWN2_OP_MODE_METHOD_H_OFFSITE    GENMASK(4, 3)
> +#define CDM_CDWN2_OP_MODE_METHOD_V_OFFSITE    GENMASK(6, 5)

I think it might be easier to define

enum {
  CDM_CDWN2_METHOD_DROP_PIXEL = 0,
  CDM_CDWN2_METHOD_AVG = 1,
  CDM_CDWN2_METHOD_ = 2,
  CDM_CDWN2_METHOD_DROP_PIXEL = 3,
};

then use FIELD_PREP()

> +#define CDM_CDWN2_V_PIXEL_DROP_MASK           GENMASK(6, 5)
> +#define CDM_CDWN2_H_PIXEL_DROP_MASK           GENMASK(4, 3)

Why are they called foo_DROP_bar?

> +
> +/* 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 = 0;
> +       u32 out_size = 0;

No need to init it, please drop.

> +
> +       if (cfg->output_bit_depth != CDM_CDWN_OUTPUT_10BIT)
> +               opmode |= CDM_CDWN2_OP_MODE_BITS_OUT_8BIT;
> +
> +       /* ENABLE DWNS_H bit */
> +       opmode |= CDM_CDWN2_OP_MODE_ENABLE_H;
> +
> +       switch (cfg->h_cdwn_type) {
> +       case CDM_CDWN_DISABLE:
> +               /* CLEAR METHOD_H field */
> +               opmode &= ~CDM_CDWN2_H_PIXEL_DROP_MASK;
> +               /* CLEAR DWNS_H bit */
> +               opmode &= ~CDM_CDWN2_OP_MODE_ENABLE_H;

Please, can we get rid of clears for the zero-initialised variable? If
you move the 10bit/8bit check after this switch, you can drop the = 0
from the variable definition and instead have:

switch (type) {
case DISABLE:
    opmode = 0;
    break;
case PIXEL_DROP:
    opmode = CDM_CDWN2_OP_MODE_ENABLE_H |
                     FIELD_PREP(CDM_CDWM2_OP_MODE_METHOD_H,
CDM_CDWN2_METHOD_DROP_PIXEL);
    break;
case AVG:
    opmode = CDM_CDWN2_OP_MODE_ENABLE_H |
                     FIELD_PREP(CDM_CDWM2_OP_MODE_METHOD_H,
CDM_CDWN2_METHOD_AVG);
   break;
// etc.
}

Same for the v_type.

Also could you please drop useless comments which repeat what is being
done in the next line?

> +               break;
> +       case CDM_CDWN_PIXEL_DROP:
> +               /* Clear METHOD_H field (pixel drop is 0) */
> +               opmode &= ~CDM_CDWN2_H_PIXEL_DROP_MASK;
> +               break;
> +       case CDM_CDWN_AVG:
> +               /* Clear METHOD_H field (Average is 0x1) */
> +               opmode &= ~CDM_CDWN2_H_PIXEL_DROP_MASK;
> +               opmode |= CDM_CDWN2_OP_MODE_METHOD_H_AVG;
> +               break;
> +       case CDM_CDWN_COSITE:
> +               /* Clear METHOD_H field (Average is 0x2) */

So, is Average 0x1 or 0x2? Or 0x3 as written below?

> +               opmode &= ~CDM_CDWN2_H_PIXEL_DROP_MASK;
> +               opmode |= CDM_CDWN2_OP_MODE_METHOD_H_COSITE;
> +               /* Co-site horizontal coefficients */
> +               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:
> +               /* Clear METHOD_H field (Average is 0x3) */
> +               opmode &= ~CDM_CDWN2_H_PIXEL_DROP_MASK;
> +               opmode |= CDM_CDWN2_OP_MODE_METHOD_H_OFFSITE;
> +
> +               /* Off-site horizontal coefficients */
> +               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;
> +       }
> +
> +       /* ENABLE DWNS_V bit */
> +       opmode |= CDM_CDWN2_OP_MODE_ENABLE_V;
> +
> +       switch (cfg->v_cdwn_type) {
> +       case CDM_CDWN_DISABLE:
> +               /* CLEAR METHOD_V field */
> +               opmode &= ~CDM_CDWN2_V_PIXEL_DROP_MASK;
> +               /* CLEAR DWNS_V bit */
> +               opmode &= ~CDM_CDWN2_OP_MODE_ENABLE_V;
> +               break;
> +       case CDM_CDWN_PIXEL_DROP:
> +               /* Clear METHOD_V field (pixel drop is 0) */
> +               opmode &= ~CDM_CDWN2_V_PIXEL_DROP_MASK;
> +               break;
> +       case CDM_CDWN_AVG:
> +               /* Clear METHOD_V field (Average is 0x1) */
> +               opmode &= ~CDM_CDWN2_V_PIXEL_DROP_MASK;
> +               opmode |= CDM_CDWN2_OP_MODE_METHOD_V_AVG;
> +               break;
> +       case CDM_CDWN_COSITE:
> +               /* Clear METHOD_V field (Average is 0x2) */
> +               opmode &= ~CDM_CDWN2_V_PIXEL_DROP_MASK;
> +               opmode |= CDM_CDWN2_OP_MODE_METHOD_V_COSITE;
> +               /* Co-site vertical coefficients */
> +               DPU_REG_WRITE(c,
> +                             CDM_CDWN2_COEFF_COSITE_V,
> +                             cosite_v_coeff[0]);
> +               break;
> +       case CDM_CDWN_OFFSITE:
> +               /* Clear METHOD_V field (Average is 0x3) */
> +               opmode &= ~CDM_CDWN2_V_PIXEL_DROP_MASK;
> +               opmode |= CDM_CDWN2_OP_MODE_METHOD_V_OFFSITE;
> +
> +               /* Off-site vertical coefficients */
> +               DPU_REG_WRITE(c,
> +                             CDM_CDWN2_COEFF_OFFSITE_V,
> +                             offsite_v_coeff[0]);
> +               break;
> +       default:
> +               return -EINVAL;
> +       }
> +
> +       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 = 0xF; /* Disabled */

lowercase hex. And it is easier to move it to the if (pp) condition,
like it was done for INTF or WB.

> +
> +       c = &ctx->hw;
> +
> +       if (pp)
> +               mux_cfg = (pp - PINGPONG_0) & 0x7;
> +
> +       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;
> +}
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.h
> new file mode 100644
> index 000000000000..e7d57dbd6103
> --- /dev/null
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.h
> @@ -0,0 +1,130 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (c) 2023, The Linux Foundation. All rights reserved.
> + */
> +
> +#ifndef _DPU_HW_CDM_H
> +#define _DPU_HW_CDM_H
> +
> +#include "dpu_hw_mdss.h"
> +#include "dpu_hw_top.h"
> +
> +struct dpu_hw_cdm;
> +
> +/**
> + * struct dpu_hw_cdm_cfg : current configuration of CDM block
> + *
> + *  @output_width:         output ROI width of CDM block
> + *  @output_height:        output ROI height of CDM block
> + *  @output_bit_depth:     output bit-depth of CDM block
> + *  @h_cdwn_type:          downsample type used for horizontal pixels
> + *  @v_cdwn_type:          downsample type used for vertical pixels
> + *  @output_fmt:           handle to dpu_format of CDM block
> + *  @csc_cfg:              handle to CSC matrix programmed for CDM block
> + *  @output_type:          interface to which CDM is paired (HDMI/WB)
> + *  @pp_id:                ping-pong block to which CDM is bound to
> + */
> +struct dpu_hw_cdm_cfg {
> +       u32 output_width;
> +       u32 output_height;
> +       u32 output_bit_depth;
> +       u32 h_cdwn_type;
> +       u32 v_cdwn_type;
> +       const struct dpu_format *output_fmt;
> +       const struct dpu_csc_cfg *csc_cfg;
> +       u32 output_type;
> +       int pp_id;
> +};
> +
> +/*
> + * These values are used indicate which type of downsample is used
> + * in the horizontal/vertical direction for the CDM block.
> + */
> +enum dpu_hw_cdwn_type {
> +       CDM_CDWN_DISABLE,
> +       CDM_CDWN_PIXEL_DROP,
> +       CDM_CDWN_AVG,
> +       CDM_CDWN_COSITE,
> +       CDM_CDWN_OFFSITE,
> +};
> +
> +/*
> + * CDM block can be paired with WB or HDMI block. These values match
> + * the input with which the CDM block is paired.
> + */
> +enum dpu_hw_cdwn_output_type {
> +       CDM_CDWN_OUTPUT_HDMI,
> +       CDM_CDWN_OUTPUT_WB,
> +};
> +
> +/*
> + * CDM block can give an 8-bit or 10-bit output. These values
> + * are used to indicate the output bit depth of CDM block
> + */
> +enum dpu_hw_cdwn_output_bit_depth {
> +       CDM_CDWN_OUTPUT_8BIT,
> +       CDM_CDWN_OUTPUT_10BIT,
> +};
> +
> +/**
> + * struct dpu_hw_cdm_ops : Interface to the chroma down Hw driver functions
> + *                         Assumption is these functions will be called after
> + *                         clocks are enabled
> + *  @enable:               Enables the output to interface and programs the
> + *                         output packer
> + *  @bind_pingpong_blk:    enable/disable the connection with pingpong which
> + *                         will feed pixels to this cdm
> + */
> +struct dpu_hw_cdm_ops {
> +       /**
> +        * Enable the CDM module
> +        * @cdm         Pointer to chroma down context
> +        */
> +       int (*enable)(struct dpu_hw_cdm *cdm, struct dpu_hw_cdm_cfg *cfg);
> +
> +       /**
> +        * Enable/disable the connection with pingpong
> +        * @cdm         Pointer to chroma down context
> +        * @pp          pingpong block id.
> +        */
> +       void (*bind_pingpong_blk)(struct dpu_hw_cdm *cdm, const enum dpu_pingpong pp);
> +};
> +
> +/**
> + * struct dpu_hw_cdm - cdm description
> + * @base: Hardware block base structure
> + * @hw: Block hardware details
> + * @idx: CDM index
> + * @caps: Pointer to cdm_cfg
> + * @ops: handle to operations possible for this CDM
> + */
> +struct dpu_hw_cdm {
> +       struct dpu_hw_blk base;
> +       struct dpu_hw_blk_reg_map hw;
> +
> +       /* chroma down */
> +       const struct dpu_cdm_cfg *caps;
> +       enum  dpu_cdm  idx;
> +
> +       /* ops */
> +       struct dpu_hw_cdm_ops ops;
> +};
> +
> +/**
> + * dpu_hw_cdm_init - initializes the cdm hw driver object.
> + * should be called once before accessing every cdm.
> + * @dev: DRM device handle
> + * @cdm: CDM catalog entry for which driver object is required
> + * @addr :   mapped register io address of MDSS
> + * @mdss_rev: mdss hw core revision
> + */
> +struct dpu_hw_cdm *dpu_hw_cdm_init(struct drm_device *dev,
> +                                  const struct dpu_cdm_cfg *cdm, void __iomem *addr,
> +                                  const struct dpu_mdss_version *mdss_rev);
> +
> +static inline struct dpu_hw_cdm *to_dpu_hw_cdm(struct dpu_hw_blk *hw)
> +{
> +       return container_of(hw, struct dpu_hw_cdm, base);
> +}
> +
> +#endif /*_DPU_HW_CDM_H */
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> index f319c8232ea5..9db4cf61bd29 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> @@ -466,6 +466,7 @@ struct dpu_mdss_color {
>  #define DPU_DBG_MASK_ROT      (1 << 9)
>  #define DPU_DBG_MASK_DSPP     (1 << 10)
>  #define DPU_DBG_MASK_DSC      (1 << 11)
> +#define DPU_DBG_MASK_CDM      (1 << 12)
>
>  /**
>   * struct dpu_hw_tear_check - Struct contains parameters to configure
> --
> 2.40.1
>


-- 
With best wishes
Dmitry



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