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Hi CK,
On Mon, 2024-07-01 at 02:22 +0000, CK Hu (胡俊光) wrote:
> Hi, Shawn:
>
> On Thu, 2024-06-20 at 01:27 +0800, Hsiao Chien Sung via B4 Relay
> wrote:
> >
> > External email : Please do not click links or open attachments
> > until you have verified the sender or the content.
> > From: Hsiao Chien Sung <shawn.sung@mediatek.com>
> >
> > Support "None" alpha blending mode on MediaTek's chips.
> >
> > Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com>
> > ---
> > drivers/gpu/drm/mediatek/mtk_ethdr.c | 13 ++++++++++---
> > 1 file changed, 10 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_ethdr.c
> > b/drivers/gpu/drm/mediatek/mtk_ethdr.c
> > index 36021cb8df62..48b714994492 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_ethdr.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_ethdr.c
> > @@ -3,6 +3,7 @@
> > * Copyright (c) 2021 MediaTek Inc.
> > */
> >
> > +#include <drm/drm_blend.h>
> > #include <drm/drm_fourcc.h>
> > #include <drm/drm_framebuffer.h>
> > #include <linux/clk.h>
> > @@ -35,6 +36,7 @@
> > #define MIX_SRC_L0_ENBIT(0)
> > #define MIX_L_SRC_CON(n)(0x28 + 0x18 * (n))
> > #define NON_PREMULTI_SOURCE(2 << 12)
> > +#define PREMULTI_SOURCE(3 << 12)
> > #define MIX_L_SRC_SIZE(n)(0x30 + 0x18 * (n))
> > #define MIX_L_SRC_OFFSET(n)(0x34 + 0x18 * (n))
> > #define MIX_FUNC_DCM00x120
> > @@ -175,7 +177,13 @@ void mtk_ethdr_layer_config(struct device
> > *dev, unsigned int idx,
> > alpha_con |= state->base.alpha & MIXER_ALPHA;
> > }
> >
> > -if (state->base.fb && !state->base.fb->format->has_alpha) {
> > +if (state->base.pixel_blend_mode == DRM_MODE_BLEND_PIXEL_NONE)
> > +alpha_con |= PREMULTI_SOURCE;
> > +else
> > +alpha_con |= NON_PREMULTI_SOURCE;
>
> Coverage mode is an already support mode, but this patch modify
> alpha_con for coverage mode.
> So this is a bug fix?
In oreder to replace the default setting that is set in
mtk_ethdr_config(), we change mtk_ddp_write_mask() to mtk_ddp_write(),
and this change will also reset NON_PREMULTI_SOURCE bit that was
assigned in mtk_ethdr_config(). Therefore, we must still set
NON_PREMULTI_SOURCE bit if the blend mode is not
DRM_MODE_BLEND_PIXEL_NONE.
Regards,
Shawn
>
> Regards,
> CK
>
> > +
> > +if ((state->base.fb && !state->base.fb->format->has_alpha) ||
> > + state->base.pixel_blend_mode == DRM_MODE_BLEND_PIXEL_NONE) {
> > /*
> > * Mixer doesn't support CONST_BLD mode,
> > * use a trick to make the output equivalent
> > @@ -191,8 +199,7 @@ void mtk_ethdr_layer_config(struct device *dev,
> > unsigned int idx,
> > mtk_ddp_write(cmdq_pkt, pending->height << 16 | align_width,
> > &mixer->cmdq_base,
> > mixer->regs, MIX_L_SRC_SIZE(idx));
> > mtk_ddp_write(cmdq_pkt, offset, &mixer->cmdq_base, mixer->regs,
> > MIX_L_SRC_OFFSET(idx));
> > -mtk_ddp_write_mask(cmdq_pkt, alpha_con, &mixer->cmdq_base, mixer-
> > >regs, MIX_L_SRC_CON(idx),
> > - 0x1ff);
> > +mtk_ddp_write(cmdq_pkt, alpha_con, &mixer->cmdq_base, mixer->regs,
> > MIX_L_SRC_CON(idx));
> > mtk_ddp_write_mask(cmdq_pkt, BIT(idx), &mixer->cmdq_base, mixer-
> > >regs, MIX_SRC_CON,
> > BIT(idx));
> > }
> >
> > --
> > Git-146)
> >
> >
> >
</pre>
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