linux-kernel - Re: [PATCH v2 01/12] drm/sun4i: sun6i_mipi_dsi: Compute burst mode loop N1 instruction delay

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAMty3ZBDa2wjjCh8NtrbKNYz=mr1xhZKv9JfnmDPDBQRO+CkYw@mail.gmail.com>
Date:   Mon, 19 Nov 2018 16:28:29 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Icenowy Zheng <icenowy@...c.io>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        TL Lim <tllim@...e64.org>, linux-sunxi@...glegroups.com,
        linux-amarula@...rulasolutions.com
Subject: Re: [PATCH v2 01/12] drm/sun4i: sun6i_mipi_dsi: Compute burst mode
 loop N1 instruction delay

On Mon, Nov 19, 2018 at 1:57 PM Maxime Ripard <maxime.ripard@...tlin.com> wrote:
>
> On Fri, Nov 16, 2018 at 10:09:05PM +0530, Jagan Teki wrote:
> > Loop N1 instruction delay for burst mode lcd panel are
> > computed as per BSP code.
> >
> > Reference code is available in BSP (from linux-sunxi
> > drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c)
> >
> > dsi_dev[sel]->dsi_inst_loop_num.bits.loop_n1=
> > (panel->lcd_ht-panel->lcd_x)*(150)/(panel->lcd_dclk_freq*8) - 50;
> > => (((mode->htotal - mode->hdisplay) * 150) /
> >      ((mode->clock / 1000) * 8)) - 50;
> >
> > So use the similar computation for loop N1 delay.
> >
> > Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
>
> *why* are you doing this? What is it fixing? on which devices?

You mentioned the separate function to compute the delay for all modes
[1], ie what I did. did I missing anything?

[1] https://patchwork.kernel.org/patch/10666599/