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References: <1626051778-13577-1-git-send-email-yongqiang.niu@mediatek.com> <1626051778-13577-2-git-send-email-yongqiang.niu@mediatek.com>
In-Reply-To: <1626051778-13577-2-git-send-email-yongqiang.niu@mediatek.com>
From:   Hsin-Yi Wang <hsinyi@chromium.org>
Date:   Fri, 16 Jul 2021 13:41:07 +0800
Message-ID: <CAJMQK-gL1X7RveDVqfQQpkpqJPXzrBT5q1BdG28G6nPxbhNJ-w@mail.gmail.com>
Subject: Re: [PATCH v2, 1/3] drm/mediatek: Separate aal module
To:     Yongqiang Niu <yongqiang.niu@mediatek.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Jassi Brar <jassisinghbrar@gmail.com>,
        Fabien Parent <fparent@baylibre.com>,
        Dennis YC Hsieh <dennis-yc.hsieh@mediatek.com>,
        Devicetree List <devicetree@vger.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@lists.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@lists.infradead.org>,
        lkml <linux-kernel@vger.kernel.org>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        Project_Global_Chrome_Upstream_Group@mediatek.com
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Precedence: bulk

On Mon, Jul 12, 2021 at 9:03 AM Yongqiang Niu
<yongqiang.niu@mediatek.com> wrote:
>
> mt8183 aal has no gamma function
>
> Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/Makefile           |   3 +-
>  drivers/gpu/drm/mediatek/mtk_disp_aal.c     | 166 ++++++++++++++++++++++++++++
>  drivers/gpu/drm/mediatek/mtk_disp_drv.h     |   9 ++
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c |  39 +------
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c      |   6 +-
>  drivers/gpu/drm/mediatek/mtk_drm_drv.h      |   1 +
>  6 files changed, 184 insertions(+), 40 deletions(-)
>  create mode 100644 drivers/gpu/drm/mediatek/mtk_disp_aal.c
>
> diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
> index dc54a7a..29098d7 100644
> --- a/drivers/gpu/drm/mediatek/Makefile
> +++ b/drivers/gpu/drm/mediatek/Makefile
> @@ -1,6 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0
>
> -mediatek-drm-y := mtk_disp_ccorr.o \
> +mediatek-drm-y := mtk_disp_aal.o \
> +                 mtk_disp_ccorr.o \
>                   mtk_disp_color.o \
>                   mtk_disp_gamma.o \
>                   mtk_disp_ovl.o \
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_aal.c b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> new file mode 100644
> index 0000000..fb212e96
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> @@ -0,0 +1,166 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2021 MediaTek Inc.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/component.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/platform_device.h>
> +#include <linux/soc/mediatek/mtk-cmdq.h>
> +
> +#include "mtk_disp_drv.h"
> +#include "mtk_drm_crtc.h"
> +#include "mtk_drm_ddp_comp.h"
> +
> +#define DISP_AAL_EN                            0x0000
> +#define AAL_EN                                         BIT(0)
> +#define DISP_AAL_SIZE                          0x0030
> +
> +
> +struct mtk_disp_aal_data {
> +       bool has_gamma;
> +};
> +
> +/**
> + * struct mtk_disp_aal - DISP_AAL driver structure
> + * @ddp_comp - structure containing type enum and hardware resources
> + * @crtc - associated crtc to report irq events to
> + */
> +struct mtk_disp_aal {
> +       struct clk *clk;
> +       void __iomem *regs;
> +       struct cmdq_client_reg cmdq_reg;
> +       const struct mtk_disp_aal_data *data;
> +};
> +
> +int mtk_aal_clk_enable(struct device *dev)
> +{
> +       struct mtk_disp_aal *aal = dev_get_drvdata(dev);
> +
> +       return clk_prepare_enable(aal->clk);
> +}
> +
> +void mtk_aal_clk_disable(struct device *dev)
> +{
> +       struct mtk_disp_aal *aal = dev_get_drvdata(dev);
> +
> +       clk_disable_unprepare(aal->clk);
> +}
> +
> +void mtk_aal_config(struct device *dev, unsigned int w,
> +                          unsigned int h, unsigned int vrefresh,
> +                          unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
> +{
> +       struct mtk_disp_aal *aal = dev_get_drvdata(dev);
> +
> +       mtk_ddp_write(cmdq_pkt, w << 16 | h, &aal->cmdq_reg, aal->regs, DISP_AAL_SIZE);
> +}
> +
> +void mtk_aal_gamma_set(struct device *dev, struct drm_crtc_state *state)
> +{
> +       struct mtk_disp_aal *aal = dev_get_drvdata(dev);
> +
> +       if (aal->data && aal->data->has_gamma)
> +               mtk_gamma_set_common(aal->regs, state);
> +}
> +
> +void mtk_aal_start(struct device *dev)
> +{
> +       struct mtk_disp_aal *aal = dev_get_drvdata(dev);
> +
> +       writel(AAL_EN, aal->regs + DISP_AAL_EN);
> +}
> +
> +void mtk_aal_stop(struct device *dev)
> +{
> +       struct mtk_disp_aal *aal = dev_get_drvdata(dev);
> +
> +       writel_relaxed(0x0, aal->regs + DISP_AAL_EN);
> +}
> +
> +static int mtk_disp_aal_bind(struct device *dev, struct device *master,
> +                              void *data)
> +{
> +       return 0;
> +}
> +
> +static void mtk_disp_aal_unbind(struct device *dev, struct device *master,
> +                                 void *data)
> +{
> +}
> +
> +static const struct component_ops mtk_disp_aal_component_ops = {
> +       .bind   = mtk_disp_aal_bind,
> +       .unbind = mtk_disp_aal_unbind,
> +};
> +
> +static int mtk_disp_aal_probe(struct platform_device *pdev)
> +{
> +       struct device *dev = &pdev->dev;
> +       struct mtk_disp_aal *priv;
> +       struct resource *res;
> +       int ret;
> +
> +       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +       if (!priv)
> +               return -ENOMEM;
> +
> +       priv->clk = devm_clk_get(dev, NULL);
> +       if (IS_ERR(priv->clk)) {
> +               dev_err(dev, "failed to get aal clk\n");
> +               return PTR_ERR(priv->clk);
> +       }
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       priv->regs = devm_ioremap_resource(dev, res);
> +       if (IS_ERR(priv->regs)) {
> +               dev_err(dev, "failed to ioremap aal\n");
> +               return PTR_ERR(priv->regs);
> +       }
> +
> +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> +       ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0);
> +       if (ret)
> +               dev_dbg(dev, "get mediatek,gce-client-reg fail!\n");
> +#endif
> +
> +       priv->data = of_device_get_match_data(dev);
> +       platform_set_drvdata(pdev, priv);
> +
> +       ret = component_add(dev, &mtk_disp_aal_component_ops);
> +       if (ret)
> +               dev_err(dev, "Failed to add component: %d\n", ret);
> +
> +       return ret;
> +}
> +
> +static int mtk_disp_aal_remove(struct platform_device *pdev)
> +{
> +       component_del(&pdev->dev, &mtk_disp_aal_component_ops);
> +
> +       return 0;
> +}
> +
> +static const struct mtk_disp_aal_data mt8173_aal_driver_data = {
> +       .has_gamma = true,
> +};
> +
> +static const struct of_device_id mtk_disp_aal_driver_dt_match[] = {
> +       { .compatible = "mediatek,mt8173-disp-aal",
> +         .data = &mt8173_aal_driver_data},
> +       {},
> +};
> +MODULE_DEVICE_TABLE(of, mtk_disp_aal_driver_dt_match);
> +
> +struct platform_driver mtk_disp_aal_driver = {
> +       .probe          = mtk_disp_aal_probe,
> +       .remove         = mtk_disp_aal_remove,
> +       .driver         = {
> +               .name   = "mediatek-disp-aal",
> +               .owner  = THIS_MODULE,
> +               .of_match_table = mtk_disp_aal_driver_dt_match,
> +       },
> +};
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> index cafd9df..86c3068 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> @@ -9,6 +9,15 @@
>  #include <linux/soc/mediatek/mtk-cmdq.h>
>  #include "mtk_drm_plane.h"
>
> +int mtk_aal_clk_enable(struct device *dev);
> +void mtk_aal_clk_disable(struct device *dev);
> +void mtk_aal_config(struct device *dev, unsigned int w,
> +                   unsigned int h, unsigned int vrefresh,
> +                   unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
> +void mtk_aal_gamma_set(struct device *dev, struct drm_crtc_state *state);
> +void mtk_aal_start(struct device *dev);
> +void mtk_aal_stop(struct device *dev);
> +
>  void mtk_ccorr_ctm_set(struct device *dev, struct drm_crtc_state *state);
>  int mtk_ccorr_clk_enable(struct device *dev);
>  void mtk_ccorr_clk_disable(struct device *dev);
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 75bc00e..f367142 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c

in mtk_ddp_comp_init(), MTK_DISP_AAL should be skipped in the if()
block to avoid creating priv again.

@@ -435,7 +435,8 @@ int mtk_ddp_comp_init(struct device_node *node,
struct mtk_ddp_comp *comp,
        }
        comp->dev = &comp_pdev->dev;

-       if (type == MTK_DISP_BLS ||
+       if (type == MTK_DISP_AAL ||
+           type == MTK_DISP_BLS ||
            type == MTK_DISP_CCORR ||

Otherwise we would see

[    0.216759] mediatek-drm mediatek-drm.1.auto: Adding component
match for /soc/aal@14010000
[    0.431996] platform 14010000.aal: Resources present before probing

and the display is completely black.


> @@ -32,9 +32,6 @@
>
>  #define DISP_REG_UFO_START                     0x0000
>
> -#define DISP_AAL_EN                            0x0000
> -#define DISP_AAL_SIZE                          0x0030
> -
>  #define DISP_DITHER_EN                         0x0000
>  #define DITHER_EN                              BIT(0)
>  #define DISP_DITHER_CFG                                0x0020
> @@ -48,8 +45,6 @@
>
>  #define UFO_BYPASS                             BIT(2)
>
> -#define AAL_EN                                 BIT(0)
> -
>  #define DISP_DITHERING                         BIT(2)
>  #define DITHER_LSB_ERR_SHIFT_R(x)              (((x) & 0x7) << 28)
>  #define DITHER_OVFLW_BIT_R(x)                  (((x) & 0x7) << 24)
> @@ -190,36 +185,6 @@ static void mtk_ufoe_start(struct device *dev)
>         writel(UFO_BYPASS, priv->regs + DISP_REG_UFO_START);
>  }
>
> -static void mtk_aal_config(struct device *dev, unsigned int w,
> -                          unsigned int h, unsigned int vrefresh,
> -                          unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
> -{
> -       struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
> -
> -       mtk_ddp_write(cmdq_pkt, w << 16 | h, &priv->cmdq_reg, priv->regs, DISP_AAL_SIZE);
> -}
> -
> -static void mtk_aal_gamma_set(struct device *dev, struct drm_crtc_state *state)
> -{
> -       struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
> -
> -       mtk_gamma_set_common(priv->regs, state);
> -}
> -
> -static void mtk_aal_start(struct device *dev)
> -{
> -       struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
> -
> -       writel(AAL_EN, priv->regs + DISP_AAL_EN);
> -}
> -
> -static void mtk_aal_stop(struct device *dev)
> -{
> -       struct mtk_ddp_comp_dev *priv = dev_get_drvdata(dev);
> -
> -       writel_relaxed(0x0, priv->regs + DISP_AAL_EN);
> -}
> -
>  static void mtk_dither_config(struct device *dev, unsigned int w,
>                               unsigned int h, unsigned int vrefresh,
>                               unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
> @@ -247,8 +212,8 @@ static void mtk_dither_stop(struct device *dev)
>  }
>
>  static const struct mtk_ddp_comp_funcs ddp_aal = {
> -       .clk_enable = mtk_ddp_clk_enable,
> -       .clk_disable = mtk_ddp_clk_disable,
> +       .clk_enable = mtk_aal_clk_enable,
> +       .clk_disable = mtk_aal_clk_disable,
>         .gamma_set = mtk_aal_gamma_set,
>         .config = mtk_aal_config,
>         .start = mtk_aal_start,
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index b46bdb8..67a585e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -532,11 +532,12 @@ static int mtk_drm_probe(struct platform_device *pdev)
>                 private->comp_node[comp_id] = of_node_get(node);
>
>                 /*
> -                * Currently only the CCORR, COLOR, GAMMA, OVL, RDMA, DSI, and DPI
> +                * Currently only the AAL, CCORR, COLOR, GAMMA, OVL, RDMA, DSI, and DPI
>                  * blocks have separate component platform drivers and initialize their own
>                  * DDP component structure. The others are initialized here.
>                  */
> -               if (comp_type == MTK_DISP_CCORR ||
> +               if (comp_type == MTK_DISP_AAL ||
> +                   comp_type == MTK_DISP_CCORR ||
>                     comp_type == MTK_DISP_COLOR ||
>                     comp_type == MTK_DISP_GAMMA ||
>                     comp_type == MTK_DISP_OVL ||
> @@ -636,6 +637,7 @@ static SIMPLE_DEV_PM_OPS(mtk_drm_pm_ops, mtk_drm_sys_suspend,
>  };
>
>  static struct platform_driver * const mtk_drm_drivers[] = {
> +       &mtk_disp_aal_driver,
>         &mtk_disp_ccorr_driver,
>         &mtk_disp_color_driver,
>         &mtk_disp_gamma_driver,
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> index 637f566..3e7d1e6 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> @@ -46,6 +46,7 @@ struct mtk_drm_private {
>         struct drm_atomic_state *suspend_state;
>  };
>
> +extern struct platform_driver mtk_disp_aal_driver;
>  extern struct platform_driver mtk_disp_ccorr_driver;
>  extern struct platform_driver mtk_disp_color_driver;
>  extern struct platform_driver mtk_disp_gamma_driver;
> --
> 1.8.1.1.dirty
>