[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CAAOTY_94Bd4PGnn88r_yJC0LYkmcByTY52gwNMALuv9+D0rTXg@mail.gmail.com>
Date: Tue, 18 Aug 2020 22:45:54 +0800
From: Chun-Kuang Hu <chunkuang.hu@...nel.org>
To: Jitao Shi <jitao.shi@...iatek.com>
Cc: Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Matthias Brugger <matthias.bgg@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
David Airlie <airlied@...ux.ie>,
DRI Development <dri-devel@...ts.freedesktop.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
devicetree@...r.kernel.org,
srv_heupstream <srv_heupstream@...iatek.com>,
huijuan.xie@...iatek.com, stonea168@....com,
cawa.cheng@...iatek.com,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@...ts.infradead.org>,
Bibby Hsieh <bibby.hsieh@...iatek.com>,
CK Hu <ck.hu@...iatek.com>, yingjoe.chen@...iatek.com,
eddie.huang@...iatek.com,
Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] drm/mediatek: dsi: fix scrolling of panel with small
hfp or hbp
Hi, Jitao:
Jitao Shi <jitao.shi@...iatek.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@...iatek.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@...iatek.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@...nel.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@...ts.infradead.org
> > > http://lists.infradead.org/mailman/listinfo/linux-mediatek
>
Powered by blists - more mailing lists