linux-kernel - Re: [PATCH] drm/bridge/tc358775: Fix for dual-link LVDS

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Message-ID: <CAG3jFyt1nvtkDC2r3wc+3ky_VxtZ7s4Rto_+kMg6J_x1=QpO-Q@mail.gmail.com>
Date:   Tue, 4 Jan 2022 14:50:57 +0100
From:   Robert Foss <robert.foss@...aro.org>
To:     Vinay Simha B N <simhavcs@...il.com>
Cc:     Jiri Vanek <jirivanek1@...il.com>,
        Zheng Bin <zhengbin13@...wei.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/bridge/tc358775: Fix for dual-link LVDS

Jiri: Are you able to test this patch?

Vinay: Could you supply a R-b tag, if you feel that it is warranted?

On Tue, 14 Dec 2021 at 09:13, Vinay Simha B N <simhavcs@...il.com> wrote:
>
> Robert,
> I do not have the hardware to test this feature. Sorry for the late response.
>
> On Thu, Nov 18, 2021 at 8:20 PM Robert Foss <robert.foss@...aro.org> wrote:
>>
>> + Zhen & Vinay
>>
>> This patch looks good in itself, but I would like to see a tested by
>> tag. At the very least testing for regression in single-link LVDS but
>> ideally some third party verification of this patch.
>>
>> On Wed, 10 Nov 2021 at 23:01, Jiri Vanek <jirivanek1@...il.com> wrote:
>> >
>> > Fixed wrong register shift for single/dual link LVDS output.
>> >
>> > Signed-off-by: Jiri Vanek <jirivanek1@...il.com>
>> > ---
>> >  drivers/gpu/drm/bridge/tc358775.c | 2 +-
>> >  1 file changed, 1 insertion(+), 1 deletion(-)
>> >
>> > diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
>> > index 2272adcc5b4a..1d6ec1baeff2 100644
>> > --- a/drivers/gpu/drm/bridge/tc358775.c
>> > +++ b/drivers/gpu/drm/bridge/tc358775.c
>> > @@ -241,7 +241,7 @@ static inline u32 TC358775_LVCFG_PCLKDIV(uint32_t val)
>> >  }
>> >
>> >  #define TC358775_LVCFG_LVDLINK__MASK                         0x00000002
>> > -#define TC358775_LVCFG_LVDLINK__SHIFT                        0
>> > +#define TC358775_LVCFG_LVDLINK__SHIFT                        1
>> >  static inline u32 TC358775_LVCFG_LVDLINK(uint32_t val)
>> >  {
>> >         return ((val) << TC358775_LVCFG_LVDLINK__SHIFT) &
>> > --
>> > 2.30.2
>> >
>
>
>
> --
> regards,
> vinaysimha