From: Chun-Kuang Hu <chunkuang.hu@kernel.org>
To: Jitao Shi <jitao.shi@mediatek.com>
Cc: Chun-Kuang Hu <chunkuang.hu@kernel.org>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
DRI Development <dri-devel@lists.freedesktop.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
devicetree@vger.kernel.org,
srv_heupstream <srv_heupstream@mediatek.com>,
huijuan.xie@mediatek.com, stonea168@163.com,
cawa.cheng@mediatek.com,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@lists.infradead.org>,
Bibby Hsieh <bibby.hsieh@mediatek.com>,
CK Hu <ck.hu@mediatek.com>,
yingjoe.chen@mediatek.com, eddie.huang@mediatek.com,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v2] drm/mediatek: dsi: fix scrolling of panel with small hfp or hbp
Date: Tue, 18 Aug 2020 22:45:54 +0800 [thread overview]
Message-ID: <CAAOTY_94Bd4PGnn88r_yJC0LYkmcByTY52gwNMALuv9+D0rTXg@mail.gmail.com> (raw)
In-Reply-To: <1597718492.6381.6.camel@mszsdaap41>
Hi, Jitao:
Jitao Shi <jitao.shi@mediatek.com> 於 2020年8月18日 週二 上午10:41寫道:
>
> On Tue, 2020-08-18 at 07:42 +0800, Chun-Kuang Hu wrote:
> > Hi, Jitao:
> >
> > Jitao Shi <jitao.shi@mediatek.com> 於 2020年8月17日 週一 下午9:07寫道:
> > >
> > > horizontal_backporch_byte should be hbp * bpp - hbp extra bytes.
> > > So remove the wrong subtraction 10.
> > >
> > > Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> > > ---
> > > drivers/gpu/drm/mediatek/mtk_dsi.c | 9 ++++-----
> > > 1 file changed, 4 insertions(+), 5 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > > index 270bf22c98fe..5d031e634571 100644
> > > --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> > > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > > @@ -473,14 +473,13 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
> > > horizontal_sync_active_byte = (vm->hsync_len * dsi_tmp_buf_bpp - 10);
> >
> > So this subtraction 10 is correct?
> >
> > Regards,
> > Chun-Kuang.
> >
>
> Yes, It is right.
>
> In the cea861 and dmt spec the mini hsync is 40 pixels.
> So the vm->hsync_len * dsi_tmp_buf_bpp >= 120 > 10
>
OK, so
Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
> Best Regards
> jitao
> > >
> > > if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
> > > - horizontal_backporch_byte =
> > > - (vm->hback_porch * dsi_tmp_buf_bpp - 10);
> > > + horizontal_backporch_byte = vm->hback_porch * dsi_tmp_buf_bpp;
> > > else
> > > - horizontal_backporch_byte = ((vm->hback_porch + vm->hsync_len) *
> > > - dsi_tmp_buf_bpp - 10);
> > > + horizontal_backporch_byte = (vm->hback_porch + vm->hsync_len) *
> > > + dsi_tmp_buf_bpp;
> > >
> > > data_phy_cycles = timing->lpx + timing->da_hs_prepare +
> > > - timing->da_hs_zero + timing->da_hs_exit + 3;
> > > + timing->da_hs_zero + timing->da_hs_exit;
> > >
> > > if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
> > > if ((vm->hfront_porch + vm->hback_porch) * dsi_tmp_buf_bpp >
> > > --
> > > 2.12.5
> > > _______________________________________________
> > > Linux-mediatek mailing list
> > > Linux-mediatek@lists.infradead.org
> > > http://lists.infradead.org/mailman/listinfo/linux-mediatek
>
next prev parent reply other threads:[~2020-08-18 14:46 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-17 13:06 [PATCH v2] drm/mediatek: dsi: fix scrolling of panel with small hfp or hbp Jitao Shi
2020-08-17 23:42 ` Chun-Kuang Hu
2020-08-18 2:41 ` Jitao Shi
2020-08-18 14:45 ` Chun-Kuang Hu [this message]
2020-08-26 23:01 ` Chun-Kuang Hu
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=CAAOTY_94Bd4PGnn88r_yJC0LYkmcByTY52gwNMALuv9+D0rTXg@mail.gmail.com \
--to=chunkuang.hu@kernel.org \
--cc=airlied@linux.ie \
--cc=bibby.hsieh@mediatek.com \
--cc=cawa.cheng@mediatek.com \
--cc=ck.hu@mediatek.com \
--cc=daniel@ffwll.ch \
--cc=devicetree@vger.kernel.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=eddie.huang@mediatek.com \
--cc=huijuan.xie@mediatek.com \
--cc=jitao.shi@mediatek.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mediatek@lists.infradead.org \
--cc=mark.rutland@arm.com \
--cc=matthias.bgg@gmail.com \
--cc=robh+dt@kernel.org \
--cc=srv_heupstream@mediatek.com \
--cc=stonea168@163.com \
--cc=yingjoe.chen@mediatek.com \
/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 NNTP newsgroup(s).