linux-kernel - Re: [PATCH 01/10] drm/sun4i: sun6i_mipi_dsi: Compute burst mode loop N1 instruction delay

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Date:   Sun, 4 Nov 2018 22:15:12 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Sergey Suloev <ssuloev@...altech.com>
Cc:     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,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>
Subject: Re: [PATCH 01/10] drm/sun4i: sun6i_mipi_dsi: Compute burst mode loop
 N1 instruction delay

On Sat, Nov 3, 2018 at 8:53 PM Sergey Suloev <ssuloev@...altech.com> wrote:
>
> Hi, Jagan,
>
> On 11/3/18 1:08 PM, Jagan Teki wrote:
> > Loop N1 instruction delay for burst mode lcd panel are
> > computed as per BSP code.
> >
> > Reference code is available in BSP
> > (in 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>
> > ---
> >   drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 9 ++++++++-
> >   1 file changed, 8 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > index 86430efd9054..da152c21ec62 100644
> > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > @@ -394,7 +394,14 @@ static void sun6i_dsi_setup_burst(struct sun6i_dsi *dsi,
> >   static void sun6i_dsi_setup_inst_loop(struct sun6i_dsi *dsi,
> >                                     struct drm_display_mode *mode)
> >   {
> > -     u16 delay = 50 - 1;
> > +     struct mipi_dsi_device *device = dsi->device;
> > +     u16 delay;
> > +
> > +     if (device->mode_flags == MIPI_DSI_MODE_VIDEO_BURST)
> > +             delay = (((mode->htotal - mode->hdisplay) * 150) /
> > +                     ((mode->clock / 1000) * 8)) - 50;
> > +     else
> > +             delay = 50 - 1;
> >
> >       regmap_write(dsi->regs, SUN6I_DSI_INST_LOOP_NUM_REG(0),
> >                    SUN6I_DSI_INST_LOOP_NUM_N0(50 - 1) |
>
>
> is this patch series comes in addition to the previous MIPI DSI series
> or in its stead?

Yes, all changes were added on top of previous MIPI DSI series(ie what
I mentioned in cover-letter) since it require clock patches from
previous version.