linux-kernel - Re: [PATCH 02/10] drm/sun4i: sun6i_mipi_dsi: Support instruction loop selection

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Date:   Tue, 6 Nov 2018 16:52:07 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Jagan Teki <jagan@...rulasolutions.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
Subject: Re: [PATCH 02/10] drm/sun4i: sun6i_mipi_dsi: Support instruction
 loop selection

On Mon, Nov 05, 2018 at 04:56:35PM +0530, Jagan Teki wrote:
> On Mon, Nov 5, 2018 at 4:09 PM Maxime Ripard <maxime.ripard@...tlin.com> wrote:
> >
> > On Sat, Nov 03, 2018 at 03:38:52PM +0530, Jagan Teki wrote:
> > > Instruction loop selection would require before writing
> > > loop number registers, so enable idle, LP11 bits on
> > > loop selection register.
> > >
> > > Reference code available in BSP
> > > (in drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c)
> > > (dsi_dev[sel]->dsi_inst_loop_sel.dwval = 2<<(4*DSI_INST_ID_LP11) |
> > >       3<<(4*DSI_INST_ID_DLY);
> > >
> > > Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> > > ---
> > >  drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 4 ++++
> > >  1 file changed, 4 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > index da152c21ec62..077b57ec964c 100644
> > > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > @@ -397,6 +397,10 @@ static void sun6i_dsi_setup_inst_loop(struct sun6i_dsi *dsi,
> > >       struct mipi_dsi_device *device = dsi->device;
> > >       u16 delay;
> > >
> > > +     regmap_write(dsi->regs, SUN6I_DSI_INST_LOOP_SEL_REG,
> > > +                  DSI_INST_ID_HSC  << (4 * DSI_INST_ID_LP11) |
> > > +                  DSI_INST_ID_HSD  << (4 * DSI_INST_ID_DLY));
> > > +
> >
> > Please put this with the other instructions settings below.
> 
> Does that mean after computation delay code?

Yes

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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