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Date: Tue, 18 Jun 2024 17:00:25 +0000
From: Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>
To: CK Hu (胡俊光) <ck.hu@...iatek.com>,
Shawn Sung (宋孝謙) <Shawn.Sung@...iatek.com>,
"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
Bibby Hsieh (謝濟遠) <Bibby.Hsieh@...iatek.com>,
"jason-ch.chen@...iatek.corp-partner.google.com"
<jason-ch.chen@...iatek.corp-partner.google.com>,
Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
"daniel@...ll.ch" <daniel@...ll.ch>, "p.zabel@...gutronix.de"
<p.zabel@...gutronix.de>, "dri-devel@...ts.freedesktop.org"
<dri-devel@...ts.freedesktop.org>, "airlied@...il.com" <airlied@...il.com>,
"sean@...rly.run" <sean@...rly.run>, "matthias.bgg@...il.com"
<matthias.bgg@...il.com>, "linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"angelogioacchino.delregno@...labora.com"
<angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v9 16/21] drm/mediatek: Support "Pre-multiplied" blending
in OVL
Hi CK,
On Fri, 2024-06-14 at 05:42 +0000, CK Hu (胡俊光) wrote:
> On Fri, 2024-06-14 at 10:46 +0800, Shawn Sung wrote:
> > From: Hsiao Chien Sung <shawn.sung@...iatek.com>
> >
> > Support "Pre-multiplied" alpha blending mode on in OVL.
> > Before this patch, only the "coverage" mode is supported.
> >
> > Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.com>
> > ---
> > drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 42 ++++++++++++++++++++-
> > ----
> > 1 file changed, 34 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > index 6567806cf4e2..47d0b039a616 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > @@ -52,8 +52,12 @@
> > #define GMC_THRESHOLD_HIGH ((1 << GMC_THRESHOLD_BITS) / 4)
> > #define GMC_THRESHOLD_LOW ((1 << GMC_THRESHOLD_BITS) / 8)
> >
> > +#define OVL_CON_CLRFMT_MAN BIT(23)
> > #define OVL_CON_BYTE_SWAP BIT(24)
> > -#define OVL_CON_MTX_YUV_TO_RGB (6 << 16)
> > +
> > +/* OVL_CON_RGB_SWAP works only if OVL_CON_CLRFMT_MAN is enabled */
> > +#define OVL_CON_RGB_SWAP BIT(25)
> > +
> > #define OVL_CON_CLRFMT_RGB (1 << 12)
> > #define OVL_CON_CLRFMT_ARGB8888 (2 << 12)
> > #define OVL_CON_CLRFMT_RGBA8888 (3 << 12)
> > @@ -61,6 +65,11 @@
> > #define OVL_CON_CLRFMT_BGRA8888 (OVL_CON_CLRFMT_ARGB8888 |
> > OVL_CON_BYTE_SWAP)
> > #define OVL_CON_CLRFMT_UYVY (4 << 12)
> > #define OVL_CON_CLRFMT_YUYV (5 << 12)
> > +#define OVL_CON_MTX_YUV_TO_RGB (6 << 16)
> > +#define OVL_CON_CLRFMT_PARGB8888 ((3 << 12) | OVL_CON_CLRFMT_MAN)
>
> #define OVL_CON_CLRFMT_PARGB8888 (OVL_CON_CLRFMT_RGBA8888 |
> OVL_CON_CLRFMT_MAN)
>
> But I'm confused with the naming.
>
We found that original naming is not correct, so we fix it with the
patch:
https://patchwork.kernel.org/project/linux-mediatek/patch/20240616-mediatek-drm-next-v1-11-7e8f9cf785d8@mediatek.com/
PARGB8888 is not ARGB8888 + MAN.
If DISP_REG_OVL_CON open the MAN bit, some original color format
settings will be changed, for example:
When MAN = 0:
RGB565 = 0000 in bit[15:12]
RGB888 = 0001 in bit[15:12]
ARGB8888 = 0010 in bit[15:12]
RGBA8888 = 0011 in bit[15:12]
UYVY = 0100 in bit[15:12]
YUYV = 0101 in bit[15:12]
When MAN = 1:
RGB888 = 0000 in bit[15:12]
RGB565 = 0001 in bit[15:12]
BGRA
8888 = 0010 in bit[15:12]
PARGB8888 = 0011 in bit[15:12]BGRA4444 = 0100
in bit[15:12]
BGRA5551 = 0101 in bit[15:12]
YUYV = 1000 in bit[15:12]
UYVY
= 1001 in bit[15:12]
YVYU = 1010 in bit[15:12]
VYUY = 1011 in bit[15:12]
>
> > +#define OVL_CON_CLRFMT_PABGR8888 (OVL_CON_CLRFMT_PARGB8888 |
> > OVL_CON_RGB_SWAP)
>
> #define OVL_CON_CLRFMT_PABGR8888 (OVL_CON_CLRFMT_ABGR8888 |
> OVL_CON_CLRFMT_MAN)
>
> > +#define OVL_CON_CLRFMT_PBGRA8888 (OVL_CON_CLRFMT_PARGB8888 |
> > OVL_CON_BYTE_SWAP)
>
> #define OVL_CON_CLRFMT_PBGRA8888 (OVL_CON_CLRFMT_BGRA8888 |
> OVL_CON_CLRFMT_MAN)
>
> > +#define OVL_CON_CLRFMT_PRGBA8888 (OVL_CON_CLRFMT_PABGR8888 |
> > OVL_CON_BYTE_SWAP)
> > #define OVL_CON_CLRFMT_RGB565(ovl) ((ovl)->data->fmt_rgb565_is_0 ?
> > \
> > 0 : OVL_CON_CLRFMT_RGB)
> > #define OVL_CON_CLRFMT_RGB888(ovl) ((ovl)->data->fmt_rgb565_is_0 ?
> > \
> > @@ -74,6 +83,8 @@
> > #define OVL_CON_VIRT_FLIP BIT(9)
> > #define OVL_CON_HORZ_FLIP BIT(10)
> >
> > +#define OVL_COLOR_ALPHA GENMASK(31, 24)
> > +
> > static inline bool is_10bit_rgb(u32 fmt)
> > {
> > switch (fmt) {
> > @@ -298,7 +309,13 @@ void mtk_ovl_config(struct device *dev,
> > unsigned int w,
> > if (w != 0 && h != 0)
> > mtk_ddp_write_relaxed(cmdq_pkt, h << 16 | w, &ovl-
> > >cmdq_reg, ovl->regs,
> > DISP_REG_OVL_ROI_SIZE);
> > - mtk_ddp_write_relaxed(cmdq_pkt, 0x0, &ovl->cmdq_reg, ovl->regs,
> > DISP_REG_OVL_ROI_BGCLR);
> > +
> > + /*
> > + * The background color must be opaque black (ARGB),
> > + * otherwise the alpha blending will have no effect
> > + */
> > + mtk_ddp_write_relaxed(cmdq_pkt, OVL_COLOR_ALPHA, &ovl-
> > >cmdq_reg,
> > + ovl->regs, DISP_REG_OVL_ROI_BGCLR);
>
> The coverage mode formula is:
> dst.RGB = src.RGB * src.A + dst.RGB * (1 - src.A)
>
> The pre-multiplied mode formula is:
> dst.RGB = src.RGB + dst.RGB * (1 - src.A)
>
> Both formula has no destination alpha (I think background color is
> last destination),
> why coverage mode work fine but pre-multiplied mode has something
> wrong?
>
alpha of coverage mode formula is:
dst.a = dst.a x (0xff - src.a x SCA/0xff)/0xff + src.a x SCA/0xff;
alpha of pre-multiplied mode is:
dst.a = round( {{dst.a x [0xff - round((src.a x SCA)/0xff)]} / 0xff} +
round((src.a x SCA)/0xff) );
* SCA is constant alpha
If SCA = 0xff, then the formula will be:
dst.a = dst.a x (0xff - src.a) + src.a
If dst.a is 0, then dst.a will be src.a
If dst.a is 0xff, then dst.a will be 0xff
Regards,
Jason-JH Lin
> Regards,
> CK
>
> >
> > mtk_ddp_write(cmdq_pkt, 0x1, &ovl->cmdq_reg, ovl->regs,
> > DISP_REG_OVL_RST);
> > mtk_ddp_write(cmdq_pkt, 0x0, &ovl->cmdq_reg, ovl->regs,
> > DISP_REG_OVL_RST);
> > @@ -374,7 +391,8 @@ void mtk_ovl_layer_off(struct device *dev,
> > unsigned int idx,
> > DISP_REG_OVL_RDMA_CTRL(idx));
> > }
> >
> > -static unsigned int ovl_fmt_convert(struct mtk_disp_ovl *ovl,
> > unsigned int fmt)
> > +static unsigned int ovl_fmt_convert(struct mtk_disp_ovl *ovl,
> > unsigned int fmt,
> > + unsigned int blend_mode)
> > {
> > /* The return value in switch "MEM_MODE_INPUT_FORMAT_XXX"
> > * is defined in mediatek HW data sheet.
> > @@ -395,22 +413,30 @@ static unsigned int ovl_fmt_convert(struct
> > mtk_disp_ovl *ovl, unsigned int fmt)
> > case DRM_FORMAT_RGBA8888:
> > case DRM_FORMAT_RGBX1010102:
> > case DRM_FORMAT_RGBA1010102:
> > - return OVL_CON_CLRFMT_RGBA8888;
> > + return blend_mode == DRM_MODE_BLEND_COVERAGE ?
> > + OVL_CON_CLRFMT_RGBA8888 :
> > + OVL_CON_CLRFMT_PRGBA8888;
> > case DRM_FORMAT_BGRX8888:
> > case DRM_FORMAT_BGRA8888:
> > case DRM_FORMAT_BGRX1010102:
> > case DRM_FORMAT_BGRA1010102:
> > - return OVL_CON_CLRFMT_BGRA8888;
> > + return blend_mode == DRM_MODE_BLEND_COVERAGE ?
> > + OVL_CON_CLRFMT_BGRA8888 :
> > + OVL_CON_CLRFMT_PBGRA8888;
> > case DRM_FORMAT_XRGB8888:
> > case DRM_FORMAT_ARGB8888:
> > case DRM_FORMAT_XRGB2101010:
> > case DRM_FORMAT_ARGB2101010:
> > - return OVL_CON_CLRFMT_ARGB8888;
> > + return blend_mode == DRM_MODE_BLEND_COVERAGE ?
> > + OVL_CON_CLRFMT_ARGB8888 :
> > + OVL_CON_CLRFMT_PARGB8888;
> > case DRM_FORMAT_XBGR8888:
> > case DRM_FORMAT_ABGR8888:
> > case DRM_FORMAT_XBGR2101010:
> > case DRM_FORMAT_ABGR2101010:
> > - return OVL_CON_CLRFMT_ABGR8888;
> > + return blend_mode == DRM_MODE_BLEND_COVERAGE ?
> > + OVL_CON_CLRFMT_ABGR8888 :
> > + OVL_CON_CLRFMT_PABGR8888;
> > case DRM_FORMAT_UYVY:
> > return OVL_CON_CLRFMT_UYVY | OVL_CON_MTX_YUV_TO_RGB;
> > case DRM_FORMAT_YUYV:
> > @@ -450,7 +476,7 @@ void mtk_ovl_layer_config(struct device *dev,
> > unsigned int idx,
> > return;
> > }
> >
> > - con = ovl_fmt_convert(ovl, fmt);
> > + con = ovl_fmt_convert(ovl, fmt, blend_mode);
> > if (state->base.fb) {
> > con |= OVL_CON_AEN;
> > con |= state->base.alpha & OVL_CON_ALPHA;
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