linux-kernel - Re: [PATCH v2 2/2] Revert "drm/bridge: chrontel-ch7033: Add byteswap order setting"

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Date:   Mon, 19 Sep 2022 15:18:35 +0200
From:   Robert Foss <robert.foss@...aro.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     andrzej.hajda@...el.com, narmstrong@...libre.com, jonas@...boo.se,
        jernej.skrabec@...il.com, airlied@...ux.ie, daniel@...ll.ch,
        dianders@...omium.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Chris Morgan <macromorgan@...mail.com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/2] Revert "drm/bridge: chrontel-ch7033: Add byteswap
 order setting"

On Mon, 19 Sept 2022 at 12:48, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>
> Hi Rob,
>
> Thank you for the patch.
>
> On Mon, Sep 19, 2022 at 12:20:09PM +0200, Robert Foss wrote:
> > Revert this patch since it depends on devicetree functionality that
> > previously has been reverted in the below commit.
> >
> > commit e798ba3374a1 ("Revert "dt-bindings: Add byteswap order to chrontel ch7033"")
> >
> > This reverts commit ce9564cfc9aea65e68eb343c599317633bc2321a.
> >
> > Fixes: 8c9c40ec8344 ("Revert "drm/bridge: ti-sn65dsi86: Implement bridge connector operations for DP"")
>
> I'm not sure this Fixes tag is meaningful here. Apart from that,

Ack.

>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>
> > Signed-off-by: Robert Foss <robert.foss@...aro.org>
> > ---
> >  drivers/gpu/drm/bridge/chrontel-ch7033.c | 15 ++-------------
> >  1 file changed, 2 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/bridge/chrontel-ch7033.c b/drivers/gpu/drm/bridge/chrontel-ch7033.c
> > index c5719908ce2d..ba060277c3fd 100644
> > --- a/drivers/gpu/drm/bridge/chrontel-ch7033.c
> > +++ b/drivers/gpu/drm/bridge/chrontel-ch7033.c
> > @@ -68,7 +68,6 @@ enum {
> >       BYTE_SWAP_GBR   = 3,
> >       BYTE_SWAP_BRG   = 4,
> >       BYTE_SWAP_BGR   = 5,
> > -     BYTE_SWAP_MAX   = 6,
> >  };
> >
> >  /* Page 0, Register 0x19 */
> > @@ -356,8 +355,6 @@ static void ch7033_bridge_mode_set(struct drm_bridge *bridge,
> >       int hsynclen = mode->hsync_end - mode->hsync_start;
> >       int vbporch = mode->vsync_start - mode->vdisplay;
> >       int vsynclen = mode->vsync_end - mode->vsync_start;
> > -     u8 byte_swap;
> > -     int ret;
> >
> >       /*
> >        * Page 4
> > @@ -401,16 +398,8 @@ static void ch7033_bridge_mode_set(struct drm_bridge *bridge,
> >       regmap_write(priv->regmap, 0x15, vbporch);
> >       regmap_write(priv->regmap, 0x16, vsynclen);
> >
> > -     /* Input color swap. Byte order is optional and will default to
> > -      * BYTE_SWAP_BGR to preserve backwards compatibility with existing
> > -      * driver.
> > -      */
> > -     ret = of_property_read_u8(priv->bridge.of_node, "chrontel,byteswap",
> > -                               &byte_swap);
> > -     if (!ret && byte_swap < BYTE_SWAP_MAX)
> > -             regmap_update_bits(priv->regmap, 0x18, SWAP, byte_swap);
> > -     else
> > -             regmap_update_bits(priv->regmap, 0x18, SWAP, BYTE_SWAP_BGR);
> > +     /* Input color swap. */
> > +     regmap_update_bits(priv->regmap, 0x18, SWAP, BYTE_SWAP_BGR);
> >
> >       /* Input clock and sync polarity. */
> >       regmap_update_bits(priv->regmap, 0x19, 0x1, mode->clock >> 16);
>
> --
> Regards,
>
> Laurent Pinchart