Re: [PATCH v3 13/17] drm/mediatek: add BLENDER support for MT8196

Paul-pl Chen (陳柏霖)
2025-07-04T06:39:03Z

On Wed, 2025-06-18 at 06:40 +0000, CK Hu (胡俊光) wrote:
> On Thu, 2025-05-15 at 17:34 +0800, paul-pl.chen wrote:
> > From: Paul-pl Chen <paul-pl.chen@mediatek.com>
> >
> > BLENDER executes the alpha blending function for overlapping
> > layers from different sources, which is the primary function
> > of the overlapping system.
> >
> > Signed-off-by: Nancy Lin <nancy.lin@mediatek.com>
> > Signed-off-by: Paul-pl Chen <paul-pl.chen@mediatek.com>
> > ---
>
> [snip]
>
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_blender.c
> > @@ -0,0 +1,264 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * Copyright (c) 2025 MediaTek Inc.
> > + */
> > +
> > +#include <drm/drm_fourcc.h>
> > +#include <drm/drm_blend.h>
> > +#include <drm/drm_framebuffer.h>
> > +#include <linux/clk.h>
> > +#include <linux/component.h>
> > +#include <linux/of.h>
> > +#include <linux/of_device.h>
> > +#include <linux/of_address.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/reset.h>
> > +#include <linux/soc/mediatek/mtk-cmdq.h>
> > +#include <linux/soc/mediatek/mtk-mmsys.h>
> > +
> > +#include "mtk_crtc.h"
> > +#include "mtk_ddp_comp.h"
> > +#include "mtk_disp_drv.h"
> > +#include "mtk_drm_drv.h"
>
> alphabetic order.
>
Sure, I will remove the unused cmdq_pkt and refactor function:
mtk_disp_exdma_start()
> > +#include "mtk_disp_blender.h"
> > +#include "mtk_disp_ovl.h"
> > +
> >
>
> [snip]
>
> > +
> > +void mtk_disp_blender_config(struct device *dev, unsigned int w,
> > +      unsigned int h, unsigned int
> > vrefresh,
> > +      unsigned int bpc, bool most_top,
>
> vrefresh and bpc is useless, so drop them.
>

Understood, I will remove this unnecessary parameter.

> > +      bool most_bottom, struct cmdq_pkt
> > *cmdq_pkt)
> > +{
> > + struct mtk_disp_blender *priv = dev_get_drvdata(dev);
> > + u32 datapath;
> > +
> > + dev_dbg(dev, "%s-w:%d, h:%d\n", __func__, w, h);
> > + mtk_ddp_write(cmdq_pkt, h << 16 | w, &priv->cmdq_reg,
> > priv->regs,
> > +       DISP_REG_OVL_BLD_ROI_SIZE);
> > + mtk_ddp_write(cmdq_pkt, DISP_REG_OVL_BLD_BGCLR_BALCK,
> > &priv->cmdq_reg, priv->regs,
> > +       DISP_REG_OVL_BLD_BGCLR_CLR);
> > +
> > + /*
> > + * The input source of blender layer can be EXDMA layer
> > output or
> > + * the blender constant layer itself.
> > + * This color setting is configured for the blender
> > constant layer.
> > + */
> > + mtk_ddp_write(cmdq_pkt, DISP_REG_OVL_BLD_BGCLR_BALCK,
> > &priv->cmdq_reg, priv->regs,
> > +       DISP_REG_OVL_BLD_L0_CLR);
> > +
> > + if (most_top)
> > + datapath = OVL_BLD_BGCLR_OUT_TO_PROC;
> > + else
> > + datapath = OVL_BLD_BGCLR_OUT_TO_NEXT_LAYER;
> > + /*
> > + * The primary input is from EXDMA and the second input
> > + * is optionally from another blender
> > + */
> > + if (!most_bottom)
> > + datapath |= OVL_BLD_BGCLR_IN_SEL;
> > +
> > + mtk_ddp_write_mask(cmdq_pkt, datapath,
> > +    &priv->cmdq_reg, priv->regs,
> > DISP_REG_OVL_BLD_DATAPATH_CON,
> > +    OVL_BLD_BGCLR_OUT_TO_PROC |
> > OVL_BLD_BGCLR_OUT_TO_NEXT_LAYER |
> > +    OVL_BLD_BGCLR_IN_SEL);
> > +}
> > +
> > +void mtk_disp_blender_start(struct device *dev, struct cmdq_pkt
> > *cmdq_pkt)
>
> Drop cmdq_pkt.

OK, I will drop the cmd_pkt to refactor
function:mtk_disp_blender_start()
>
> > +{
> > + struct mtk_disp_blender *priv = dev_get_drvdata(dev);
> > +
> > + mtk_ddp_write_mask(cmdq_pkt, OVL_BLD_BYPASS_SHADOW, &priv-
> > >cmdq_reg, priv->regs,
> > +    DISP_REG_OVL_BLD_SHADOW_CTRL,
> > OVL_BLD_BYPASS_SHADOW);
> > + mtk_ddp_write_mask(cmdq_pkt, OVL_BLD_EN, &priv->cmdq_reg,
> > priv->regs,
> > +    DISP_REG_OVL_BLD_EN, OVL_BLD_EN);
> > +}
> > +
> > +void mtk_disp_blender_stop(struct device *dev, struct cmdq_pkt
> > *cmdq_pkt)
>
> Drop cmdq_pkt.
>
> Regards,
> CK
>
OK, I will drop the cmd_pkt to refactor,
function:mtk_disp_blender_stop().

> > +{
> > + struct mtk_disp_blender *priv = dev_get_drvdata(dev);
> > +
> > + mtk_ddp_write_mask(cmdq_pkt, 0, &priv->cmdq_reg, priv-
> > >regs,
> > +    DISP_REG_OVL_BLD_EN, OVL_BLD_EN);
> > +
> > + mtk_ddp_write_mask(cmdq_pkt, OVL_BLD_RST, &priv->cmdq_reg,
> > priv->regs,
> > +    DISP_REG_OVL_BLD_RST, OVL_BLD_RST);
> > + mtk_ddp_write_mask(cmdq_pkt, 0, &priv->cmdq_reg, priv-
> > >regs,
> > +    DISP_REG_OVL_BLD_RST, OVL_BLD_RST);
> > +}
> > +
>