linux-kernel - Re: [PATCH v5] drm/mediatek: fixed the calc method of data rate per lane

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Message-ID: <1479446255.24375.3.camel@mtksdaap41>
Date:   Fri, 18 Nov 2016 13:17:35 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Daniel Kurtz <djkurtz@...omium.org>
CC:     Jitao Shi <jitao.shi@...iatek.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "Rob Herring" <robh+dt@...nel.org>,
        Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        "Kumar Gala" <galak@...eaurora.org>,
        Ajay Kumar <ajaykumar.rs@...sung.com>,
        "Inki Dae" <inki.dae@...sung.com>,
        Rahul Sharma <rahul.sharma@...sung.com>,
        "Sean Paul" <seanpaul@...omium.org>,
        Vincent Palatin <vpalatin@...omium.org>,
        "Andy Yan" <andy.yan@...k-chips.com>,
        Russell King <rmk+kernel@....linux.org.uk>,
        "open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        srv_heupstream <srv_heupstream@...iatek.com>,
        Sascha Hauer <kernel@...gutronix.de>,
        Yingjoe Chen (陳英洲) 
        <yingjoe.chen@...iatek.com>,
        Eddie Huang (黃智傑) 
        <eddie.huang@...iatek.com>, cawa cheng <cawa.cheng@...iatek.com>,
        Bibby Hsieh (謝濟遠) 
        <bibby.hsieh@...iatek.com>, <stonea168@....com>
Subject: Re: [PATCH v5] drm/mediatek: fixed the calc method of data rate per
 lane

Hi, Daniel:

On Fri, 2016-11-18 at 11:22 +0800, Daniel Kurtz wrote:
> Hi CK,
> 
> On Thu, Nov 17, 2016 at 1:36 PM, CK Hu <ck.hu@...iatek.com> wrote:
> > Hi, Jitao:
> >
> >
> > On Wed, 2016-11-16 at 11:20 +0800, Jitao Shi wrote:
> >> Tune dsi frame rate by pixel clock, dsi add some extra signal (i.e.
> >> Tlpx, Ths-prepare, Ths-zero, Ths-trail,Ths-exit) when enter and exit LP
> >> mode, those signals will cause h-time larger than normal and reduce FPS.
> >> So need to multiply a coefficient to offset the extra signal's effect.
> >>   coefficient = ((htotal*bpp/lane_number)+Tlpx+Ths_prep+Ths_zero+
> >>                Ths_trail+Ths_exit)/(htotal*bpp/lane_number)
> >>
> >> Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
> >
> > It looks good to me.
> > But this patch conflict with [1] which is one patch of MT2701 series. I
> > want to apply MT2701 patches first, so please help to refine this patch
> > based on MT2701 patches.
> 
> I don't think the MT2701 DSI patches are quite ready yet (I just
> reviewed the one below).
> Can we instead land Jitao's small targeted change first, and then
> rebase the MT2701 series on top.
> 
> Thanks,
> -Dan


MT2701 series looks still have some defect to be fixed.
Therefore, I would apply this patch first.
Thanks for your help.

Regards,
CK

> >
> > [1] https://patchwork.kernel.org/patch/9422821/
> >
> > Regards,
> > CK
> >
> >> ---
> >> Change since v4:
> >>  - tune the calc comment more clear.
> >>  - define the phy timings as constants.
> >>
> >> Chnage since v3:
> >>  - wrapp the commit msg.
> >>  - fix alignment of some lines.
> >>
> >> Change since v2:
> >>  - move phy timing back to dsi_phy_timconfig.
> >>
> >> Change since v1:
> >>  - phy_timing2 and phy_timing3 refer clock cycle time.
> >>  - define values of LPX HS_PRPR HS_ZERO HS_TRAIL TA_GO TA_SURE TA_GET DA_HS_EXIT.
> >> ---
> >>
> >