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

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Date:   Tue, 4 Jan 2022 22:34:43 +0530
From:   Vinay Simha B N <simhavcs@...il.com>
To:     Jiří Vaněk <jirivanek1@...il.com>
Cc:     Robert Foss <robert.foss@...aro.org>,
        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 Vanek,

Could you please share the part number or datasheet of the dual-link
LVDS display used.

On Tue, Jan 4, 2022 at 7:59 PM Jiří Vaněk <jirivanek1@...il.com> wrote:
>
> Actually, this patch is based on testing with a real HW with dual-link LVDS display (full HD) and it also matches with a datasheet. Without this fix it does not work at all.
>
> út 4. 1. 2022 v 14:51 odesílatel Robert Foss <robert.foss@...aro.org> napsal:
>>
>> 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



-- 
regards,
vinaysimha