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Message-ID: <fe26e581f11b992aaa358141070a36360a97e192.camel@mediatek.com>
Date: Mon, 7 Oct 2024 06:09:31 +0000
From: Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>
To: CK Hu (胡俊光) <ck.hu@...iatek.com>,
"me@...mthiede.com" <me@...mthiede.com>, "yassine.oudjana@...il.com"
<yassine.oudjana@...il.com>, "chunkuang.hu@...nel.org"
<chunkuang.hu@...nel.org>, AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
Singo Chang (張興國) <Singo.Chang@...iatek.com>,
Shawn Sung (宋孝謙) <Shawn.Sung@...iatek.com>,
Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
Project_Global_Chrome_Upstream_Group
<Project_Global_Chrome_Upstream_Group@...iatek.com>,
"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] drm/mediatek: Fix XRGB format breakage for blend_modes
unsupported SoCs
Hi CK,
On Mon, 2024-10-07 at 05:57 +0000, CK Hu (胡俊光) wrote:
> Hi, Jason:
>
> On Sat, 2024-10-05 at 17:52 +0800, Jason-JH.Lin wrote:
> > If the constant alpha always set, the SoCs that is not supported
> > the
> > ignore alpha bit will still use constant alpha. That will break the
> > original constant alpha setting of XRGB foramt for blend_modes
> > unsupported SoCs, such as MT8173.
> >
> > Make the constatnt alpha only set when setting has_alpha or
> > supported
> > blend_modes SoC to fix the downgrade issue.
>
> I would like this patch to be cherry-picked to kernel 6.11 easily, so
> let this patch base on 6.12-rc1.
OK, I'll move this patch in front of this series:
[1] Fix degradation problem of alpha blending series
-
https://patchwork.kernel.org/project/linux-mediatek/list/?series=893634
and then send v9 to let you cherry-pick it to kernel-6.11 easily.
>
> >
> > Fixes: bc46eb5d5d77 ("drm/mediatek: Support DRM plane alpha in
> > OVL")
> > Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> > ---
> > drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 28 +++++++++++++++----
> > ------
> > 1 file changed, 17 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > index 703cd3f6c6d3..de3addd89442 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> > @@ -494,19 +494,25 @@ void mtk_ovl_layer_config(struct device *dev,
> > unsigned int idx,
> >
> > con = mtk_ovl_fmt_convert(ovl, state);
> > if (state->base.fb) {
> > - con |= OVL_CON_AEN;
> > - con |= state->base.alpha & OVL_CON_ALPHA;
> > + /*
> > + * For blend_modes supported SoCs, always set constant
> > alpha.
> > + * For blend_modes unsupported SoCs, set constant alpha
> > when has_alpha is set.
> > + */
> > + if (ovl->data->blend_modes || state->base.fb->format-
> > >has_alpha) {
> > + con |= OVL_CON_AEN;
> > + con |= state->base.alpha & OVL_CON_ALPHA;
>
> MT8173 does not support ignore pixel alpha, so OVL_CON_AEN would be
> disabled for XRGB.
> And this is not related to plane alpha, so plane alpha setting should
> be moved out of here.
OK, that make sense.
But I would like to ask Yassine and Adam to test this change again.
>
> > + }
> > +
> > + /*
> > + * Although the alpha channel can be ignored, CONST_BLD
> > must be enabled
> > + * for XRGB format, otherwise OVL will still read the
> > value from memory.
> > + * For RGB888 related formats, whether CONST_BLD is
> > enabled or not won't
> > + * affect the result. Therefore we use !has_alpha as
> > the condition.
> > + */
> > + if (blend_mode == DRM_MODE_BLEND_PIXEL_NONE || !state-
> > >base.fb->format->has_alpha)
> > + ignore_pixel_alpha = OVL_CONST_BLEND;
>
> This modification is not related to the bug fix, so separate to
> another patch.
OK, I'll separate it.
Regards,
Jason-JH.Lin
>
> Regards,
> CK
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