From: "Shawn Sung (宋孝謙)" <Shawn.Sung@mediatek.com>
To: "CK Hu (胡俊光)" <ck.hu@mediatek.com>,
"chunkuang.hu@kernel.org" <chunkuang.hu@kernel.org>,
"angelogioacchino.delregno@collabora.com"
<angelogioacchino.delregno@collabora.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mediatek@lists.infradead.org"
<linux-mediatek@lists.infradead.org>,
"Bibby Hsieh (謝濟遠)" <Bibby.Hsieh@mediatek.com>,
"jason-ch.chen@mediatek.corp-partner.google.com"
<jason-ch.chen@mediatek.corp-partner.google.com>,
"Nancy Lin (林欣螢)" <Nancy.Lin@mediatek.com>,
"daniel@ffwll.ch" <daniel@ffwll.ch>,
"p.zabel@pengutronix.de" <p.zabel@pengutronix.de>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"airlied@gmail.com" <airlied@gmail.com>,
"sean@poorly.run" <sean@poorly.run>,
"matthias.bgg@gmail.com" <matthias.bgg@gmail.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v7 01/18] soc: mediatek: Disable 9-bit alpha in ETHDR
Date: Tue, 7 May 2024 10:02:14 +0000 [thread overview]
Message-ID: <370b7bc33697a8c0578980e3604d1dbf6c047b4d.camel@mediatek.com> (raw)
In-Reply-To: <47908b0befd1e61c4024d6f871b97c9c11e4c0be.camel@mediatek.com>
[-- Attachment #1: Type: text/plain, Size: 760 bytes --]
Hi CK,
On Tue, 2024-05-07 at 05:58 +0000, CK Hu (胡俊光) wrote:
> Hi, Shawn:
>
> On Thu, 2024-05-02 at 18:38 +0800, Shawn Sung wrote:
> > From: Hsiao Chien Sung <shawn.sung@mediatek.com>
> >
> > ETHDR 9-bit alpha should be disabled by default,
> > otherwise alpha blending will not work.
>
> Please explain what is 9-bit alpha. Is ARGB8888 8-bit alpha? I don't
> know there are 9-bit alpha. I would like to know which function would
> be disabled when you disable 9-bit alpha.
>
When 9-bit alpha is enabled, the original alpha range 0-255 will be
remapped to 0-256 (255 = N/A) for some special case calculation.
Checked with the designer, this setting should be always disabled and
there will be no side effects.
Thanks,
Shawn
[-- Attachment #2: Type: text/html, Size: 2257 bytes --]
next prev parent reply other threads:[~2024-05-07 10:02 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-02 10:38 [PATCH v7 00/18] Support IGT in display driver Shawn Sung
2024-05-02 10:38 ` [PATCH v7 01/18] soc: mediatek: Disable 9-bit alpha in ETHDR Shawn Sung
2024-05-07 5:58 ` CK Hu (胡俊光)
2024-05-07 10:02 ` Shawn Sung (宋孝謙) [this message]
2024-05-02 10:38 ` [PATCH v7 02/18] drm/mediatek: Add OVL compatible name for MT8195 Shawn Sung
2024-05-02 10:38 ` [PATCH v7 03/18] drm/mediatek: Add missing plane settings when async update Shawn Sung
2024-05-02 10:38 ` [PATCH v7 04/18] drm/mediatek: Add DRM_MODE_ROTATE_0 to rotation property Shawn Sung
2024-05-02 10:38 ` [PATCH v7 05/18] drm/mediatek: Set DRM mode configs accordingly Shawn Sung
2024-05-03 2:38 ` CK Hu (胡俊光)
2024-05-02 10:38 ` [PATCH v7 06/18] drm/mediatek: Turn off the layers with zero width or height Shawn Sung
2024-05-02 10:38 ` [PATCH v7 07/18] drm/mediatek: Support more 10bit formats in OVL Shawn Sung
2024-05-03 2:51 ` CK Hu (胡俊光)
2024-05-02 10:38 ` [PATCH v7 08/18] drm/mediatek: Support RGBA8888 and RGBX8888 " Shawn Sung
2024-05-03 2:58 ` CK Hu (胡俊光)
2024-05-02 10:38 ` [PATCH v7 09/18] drm/mediatek: Support constant blending " Shawn Sung
2024-05-03 5:29 ` CK Hu (胡俊光)
2024-05-03 5:52 ` CK Hu (胡俊光)
2024-05-02 10:38 ` [PATCH v7 10/18] drm/mediatek: Support constant blending in Mixer Shawn Sung
2024-05-03 5:45 ` CK Hu (胡俊光)
2024-05-02 10:38 ` [PATCH v7 11/18] drm/mediatek: Support "Pre-multiplied" blending in OVL Shawn Sung
2024-05-03 9:04 ` CK Hu (胡俊光)
2024-05-02 10:38 ` [PATCH v7 12/18] drm/mediatek: Support "Pre-multiplied" blending in Mixer Shawn Sung
2024-05-03 9:28 ` CK Hu (胡俊光)
2024-05-02 10:38 ` [PATCH v7 13/18] drm/mediatek: Support "None" blending in OVL Shawn Sung
2024-05-02 10:38 ` [PATCH v7 14/18] drm/mediatek: Support "None" blending in Mixer Shawn Sung
2024-05-03 9:40 ` CK Hu (胡俊光)
2024-05-02 10:38 ` [PATCH v7 15/18] drm/mediatek: Support alpha blending in display driver Shawn Sung
2024-05-02 10:38 ` [PATCH v7 16/18] drm/mediatek: Support CRC " Shawn Sung
2024-05-04 14:22 ` kernel test robot
2024-05-02 10:38 ` [PATCH v7 17/18] drm/mediatek: Support CRC in OVL Shawn Sung
2024-05-02 10:38 ` [PATCH v7 18/18] drm/mediatek: Support CRC in OVL adaptor Shawn Sung
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=370b7bc33697a8c0578980e3604d1dbf6c047b4d.camel@mediatek.com \
--to=shawn.sung@mediatek.com \
--cc=Bibby.Hsieh@mediatek.com \
--cc=Nancy.Lin@mediatek.com \
--cc=airlied@gmail.com \
--cc=angelogioacchino.delregno@collabora.com \
--cc=chunkuang.hu@kernel.org \
--cc=ck.hu@mediatek.com \
--cc=daniel@ffwll.ch \
--cc=dri-devel@lists.freedesktop.org \
--cc=jason-ch.chen@mediatek.corp-partner.google.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mediatek@lists.infradead.org \
--cc=matthias.bgg@gmail.com \
--cc=p.zabel@pengutronix.de \
--cc=sean@poorly.run \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).