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Message-ID: <CAAOTY_8K2BQm5JOBpeP+ZYcctcHAp46JWma7z4vWGFoa1MFbCg@mail.gmail.com>
Date: Thu, 29 Aug 2024 22:54:22 +0800
From: Chun-Kuang Hu <chunkuang.hu@...nel.org>
To: Shuijing Li <shuijing.li@...iatek.com>
Cc: chunkuang.hu@...nel.org, p.zabel@...gutronix.de, airlied@...il.com, 
	daniel@...ll.ch, matthias.bgg@...il.com, 
	angelogioacchino.delregno@...labora.com, jitao.shi@...iatek.com, 
	dri-devel@...ts.freedesktop.org, linux-mediatek@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v8] drm/mediatek: dsi: Add dsi per-frame lp code for mt8188

Hi, Shuijing:

Shuijing Li <shuijing.li@...iatek.com> 於 2024年8月26日 週一 下午2:07寫道:
>
> Adding the per-frame lp function of mt8188, which can keep HFP in HS and
> reduce the time required for each line to enter and exit low power.
> Per Frame LP:
>   |<----------One Active Frame-------->|
> --______________________________________----___________________
>   ^HSA+HBP^^RGB^^HFP^^HSA+HBP^^RGB^^HFP^    ^HSA+HBP^^RGB^^HFP^
>
> Per Line LP:
>   |<---------------One Active Frame----------->|
> --______________--______________--______________----______________
>   ^HSA+HBP^^RGB^  ^HSA+HBP^^RGB^  ^HSA+HBP^^RGB^    ^HSA+HBP^^RGB^

Applied to mediatek-drm-next [1], thanks.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next

Regards,
Chun-Kuang.

>
> Signed-off-by: Shuijing Li <shuijing.li@...iatek.com>
> ---
> Changes in v8:
> Directly write value into DSI_HSTX_CKL_WC without check per suggestion from previous thread:
> https://patchwork.kernel.org/project/linux-mediatek/patch/20240819061333.26069-1-shuijing.li@mediatek.com/
> Changes in v7:
> Fix code style and simplify the code per suggestion from previous thread:
> https://patchwork.kernel.org/project/linux-mediatek/patch/20240813022315.18502-1-shuijing.li@mediatek.com/
> Changes in v6:
> Simplify the code per suggestion from previous thread:
> https://patchwork.kernel.org/project/linux-mediatek/patch/20240812070341.26053-1-shuijing.li@mediatek.com/
> Changes in v5:
> Fix code style issue and add per-line-lp function to be symmetrical with per-frame-lp.
> per suggestion from previous thread:
> https://patchwork.kernel.org/project/linux-mediatek/patch/20240801081144.22372-1-shuijing.li@mediatek.com/
> Changes in v4:
> Drop the code related to bllp_en and bllp_wc, adjust ps_wc to dsi->vm.hactive *
> dsi_buf_bpp.
> Changes in v3:
> Use function in bitfield.h and get value from phy timing, per suggestion
> from previous thread:
> https://patchwork.kernel.org/project/linux-mediatek/patch/20240424091639.22759-1-shuijing.li@mediatek.com/
> Changes in v2:
> Use bitfield macros and add new function for per prame lp and improve
> the format, per suggestion from previous thread:
> https://patchwork.kernel.org/project/linux-mediatek/patch/20240314094238.3315-1-shuijing.li@mediatek.com/
> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 106 +++++++++++++++++++++++++----
>  1 file changed, 94 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index b6e3c011a12d..eeec641cab60 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -88,12 +88,15 @@
>  #define DSI_HSA_WC             0x50
>  #define DSI_HBP_WC             0x54
>  #define DSI_HFP_WC             0x58
> +#define HFP_HS_VB_PS_WC                GENMASK(30, 16)
> +#define HFP_HS_EN                      BIT(31)
>
>  #define DSI_CMDQ_SIZE          0x60
>  #define CMDQ_SIZE                      0x3f
>  #define CMDQ_SIZE_SEL          BIT(15)
>
>  #define DSI_HSTX_CKL_WC                0x64
> +#define HSTX_CKL_WC                    GENMASK(15, 2)
>
>  #define DSI_RX_DATA0           0x74
>  #define DSI_RX_DATA1           0x78
> @@ -187,6 +190,7 @@ struct mtk_dsi_driver_data {
>         bool has_shadow_ctl;
>         bool has_size_ctl;
>         bool cmdq_long_packet_ctl;
> +       bool support_per_frame_lp;
>  };
>
>  struct mtk_dsi {
> @@ -426,7 +430,75 @@ static void mtk_dsi_ps_control(struct mtk_dsi *dsi, bool config_vact)
>         writel(ps_val, dsi->regs + DSI_PSCTRL);
>  }
>
> -static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
> +static void mtk_dsi_config_vdo_timing_per_frame_lp(struct mtk_dsi *dsi)
> +{
> +       u32 horizontal_sync_active_byte;
> +       u32 horizontal_backporch_byte;
> +       u32 horizontal_frontporch_byte;
> +       u32 hfp_byte_adjust, v_active_adjust;
> +       u32 cklp_wc_min_adjust, cklp_wc_max_adjust;
> +       u32 dsi_tmp_buf_bpp;
> +       unsigned int da_hs_trail;
> +       unsigned int ps_wc, hs_vb_ps_wc;
> +       u32 v_active_roundup, hstx_cklp_wc;
> +       u32 hstx_cklp_wc_max, hstx_cklp_wc_min;
> +       struct videomode *vm = &dsi->vm;
> +
> +       if (dsi->format == MIPI_DSI_FMT_RGB565)
> +               dsi_tmp_buf_bpp = 2;
> +       else
> +               dsi_tmp_buf_bpp = 3;
> +
> +       da_hs_trail = dsi->phy_timing.da_hs_trail;
> +       ps_wc = vm->hactive * dsi_tmp_buf_bpp;
> +
> +       if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
> +               horizontal_sync_active_byte =
> +                       vm->hsync_len * dsi_tmp_buf_bpp - 10;
> +               horizontal_backporch_byte =
> +                       vm->hback_porch * dsi_tmp_buf_bpp - 10;
> +               hfp_byte_adjust = 12;
> +               v_active_adjust = 32 + horizontal_sync_active_byte;
> +               cklp_wc_min_adjust = 12 + 2 + 4 + horizontal_sync_active_byte;
> +               cklp_wc_max_adjust = 20 + 6 + 4 + horizontal_sync_active_byte;
> +       } else {
> +               horizontal_sync_active_byte = vm->hsync_len * dsi_tmp_buf_bpp - 4;
> +               horizontal_backporch_byte = (vm->hback_porch + vm->hsync_len) *
> +                       dsi_tmp_buf_bpp - 10;
> +               cklp_wc_min_adjust = 4;
> +               cklp_wc_max_adjust = 12 + 4 + 4;
> +               if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
> +                       hfp_byte_adjust = 18;
> +                       v_active_adjust = 28;
> +               } else {
> +                       hfp_byte_adjust = 12;
> +                       v_active_adjust = 22;
> +               }
> +       }
> +       horizontal_frontporch_byte = vm->hfront_porch * dsi_tmp_buf_bpp - hfp_byte_adjust;
> +       v_active_roundup = (v_active_adjust + horizontal_backporch_byte + ps_wc +
> +                          horizontal_frontporch_byte) % dsi->lanes;
> +       if (v_active_roundup)
> +               horizontal_backporch_byte += dsi->lanes - v_active_roundup;
> +       hstx_cklp_wc_min = (DIV_ROUND_UP(cklp_wc_min_adjust, dsi->lanes) + da_hs_trail + 1)
> +                          * dsi->lanes / 6 - 1;
> +       hstx_cklp_wc_max = (DIV_ROUND_UP((cklp_wc_max_adjust + horizontal_backporch_byte +
> +                          ps_wc), dsi->lanes) + da_hs_trail + 1) * dsi->lanes / 6 - 1;
> +
> +       hstx_cklp_wc = FIELD_PREP(HSTX_CKL_WC, (hstx_cklp_wc_min + hstx_cklp_wc_max) / 2);
> +       writel(hstx_cklp_wc, dsi->regs + DSI_HSTX_CKL_WC);
> +
> +       hs_vb_ps_wc = ps_wc - (dsi->phy_timing.lpx + dsi->phy_timing.da_hs_exit +
> +                     dsi->phy_timing.da_hs_prepare + dsi->phy_timing.da_hs_zero + 2) * dsi->lanes;
> +       horizontal_frontporch_byte |= FIELD_PREP(HFP_HS_EN, 1) |
> +                                     FIELD_PREP(HFP_HS_VB_PS_WC, hs_vb_ps_wc);
> +
> +       writel(horizontal_sync_active_byte, dsi->regs + DSI_HSA_WC);
> +       writel(horizontal_backporch_byte, dsi->regs + DSI_HBP_WC);
> +       writel(horizontal_frontporch_byte, dsi->regs + DSI_HFP_WC);
> +}
> +
> +static void mtk_dsi_config_vdo_timing_per_line_lp(struct mtk_dsi *dsi)
>  {
>         u32 horizontal_sync_active_byte;
>         u32 horizontal_backporch_byte;
> @@ -436,7 +508,6 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
>         u32 dsi_tmp_buf_bpp, data_phy_cycles;
>         u32 delta;
>         struct mtk_phy_timing *timing = &dsi->phy_timing;
> -
>         struct videomode *vm = &dsi->vm;
>
>         if (dsi->format == MIPI_DSI_FMT_RGB565)
> @@ -444,16 +515,6 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
>         else
>                 dsi_tmp_buf_bpp = 3;
>
> -       writel(vm->vsync_len, dsi->regs + DSI_VSA_NL);
> -       writel(vm->vback_porch, dsi->regs + DSI_VBP_NL);
> -       writel(vm->vfront_porch, dsi->regs + DSI_VFP_NL);
> -       writel(vm->vactive, dsi->regs + DSI_VACT_NL);
> -
> -       if (dsi->driver_data->has_size_ctl)
> -               writel(FIELD_PREP(DSI_HEIGHT, vm->vactive) |
> -                      FIELD_PREP(DSI_WIDTH, vm->hactive),
> -                      dsi->regs + DSI_SIZE_CON);
> -
>         horizontal_sync_active_byte = (vm->hsync_len * dsi_tmp_buf_bpp - 10);
>
>         if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
> @@ -499,6 +560,26 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
>         writel(horizontal_sync_active_byte, dsi->regs + DSI_HSA_WC);
>         writel(horizontal_backporch_byte, dsi->regs + DSI_HBP_WC);
>         writel(horizontal_frontporch_byte, dsi->regs + DSI_HFP_WC);
> +}
> +
> +static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
> +{
> +       struct videomode *vm = &dsi->vm;
> +
> +       writel(vm->vsync_len, dsi->regs + DSI_VSA_NL);
> +       writel(vm->vback_porch, dsi->regs + DSI_VBP_NL);
> +       writel(vm->vfront_porch, dsi->regs + DSI_VFP_NL);
> +       writel(vm->vactive, dsi->regs + DSI_VACT_NL);
> +
> +       if (dsi->driver_data->has_size_ctl)
> +               writel(FIELD_PREP(DSI_HEIGHT, vm->vactive) |
> +                       FIELD_PREP(DSI_WIDTH, vm->hactive),
> +                       dsi->regs + DSI_SIZE_CON);
> +
> +       if (dsi->driver_data->support_per_frame_lp)
> +               mtk_dsi_config_vdo_timing_per_frame_lp(dsi);
> +       else
> +               mtk_dsi_config_vdo_timing_per_line_lp(dsi);
>
>         mtk_dsi_ps_control(dsi, false);
>  }
> @@ -1197,6 +1278,7 @@ static const struct mtk_dsi_driver_data mt8188_dsi_driver_data = {
>         .has_shadow_ctl = true,
>         .has_size_ctl = true,
>         .cmdq_long_packet_ctl = true,
> +       .support_per_frame_lp = true,
>  };
>
>  static const struct of_device_id mtk_dsi_of_match[] = {
> --
> 2.45.2
>

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