linux-kernel - Re: [PATCH 05/12] drm/sun4i: sun6i_mipi_dsi: Add DSI Generic short write 2 param transfer

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Message-ID: <CAMty3ZCD4ArjhPJYxv3ztWXdnby8YXQ73QqoVNoHFBc-DAxx_w@mail.gmail.com>
Date:   Thu, 27 Sep 2018 23:06:50 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Icenowy Zheng <icenowy@...c.io>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 05/12] drm/sun4i: sun6i_mipi_dsi: Add DSI Generic short
 write 2 param transfer

On Thu, Sep 27, 2018 at 10:48 PM Maxime Ripard
<maxime.ripard@...tlin.com> wrote:
>
> On Thu, Sep 27, 2018 at 05:18:43PM +0530, Jagan Teki wrote:
> > Short transfer write support for DCS and Generic transfer types
> > share similar way to process command sequence in DSI block so
> > add generic write 2 param transfer type macro so-that the panels
> > which are requesting similar transfer type may process properly.
> >
> > Also added error check for unsupporting transfer types this make
> > debugging easy for new transfer types.
> >
> > Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> > ---
> >  drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > index 156b371243c6..1c7e42015645 100644
> > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > @@ -869,6 +869,7 @@ static ssize_t sun6i_dsi_transfer(struct mipi_dsi_host *host,
> >                    SUN6I_DSI_CMD_CTL_TX_FLAG);
> >
> >       switch (msg->type) {
> > +     case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
> >       case MIPI_DSI_DCS_SHORT_WRITE:
> >       case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
>
> You should order them by alphabetical order.

I just placed it with transfer code, ok will add it alphabetical

>
> >               ret = sun6i_dsi_dcs_write_short(dsi, msg);
> > @@ -885,6 +886,8 @@ static ssize_t sun6i_dsi_transfer(struct mipi_dsi_host *host,
> >               }
> >
> >       default:
> > +             dev_err(dsi->dev, "unsupported message type 0x%02x\n",
> > +                     msg->type);
>
> And this isn't an error check.

But unsupported message type by sun6i_dsi should be an error
eventually isn't it? and we can easily figure out where the error
trigger.