linux-kernel - Re: [PATCH v5 6/7] ARM: dts: rockchip: Specify rk3288-veyron-chromebook's display timings

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Date:   Sun, 7 Apr 2019 01:15:51 +0000
From:   Urja Rannikko <urjaman@...il.com>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Sean Paul <seanpaul@...omium.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Enric Balletbò <enric.balletbo@...labora.com>,
        Ezequiel Garcia <ezequiel@...labora.com>, mka@...omium.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 6/7] ARM: dts: rockchip: Specify rk3288-veyron-chromebook's
 display timings

Hi,

On Mon, Apr 1, 2019 at 5:18 PM Douglas Anderson <dianders@...omium.org> wrote:
>
> Let's document the display timings that most veyron chromebooks (like
> jaq, jerry, mighty, speedy) have been using out in the field.  This
> uses the standard blankings but a slightly slower clock rate, thus
> getting a refresh rate 58.3 Hz.
>
> NOTE: this won't really do anything except cause DRM to properly
> report the refresh rate since vop_crtc_mode_fixup() was rounding the
> pixel clock to 74.25 MHz anyway.  Apparently the adjusted rate isn't
> exposed to userspace so it's important that the rate we're trying to
> achieve is mostly right.

I just thought it would be worth mentioning that I have picked &
tested a close to 60Hz mode on two veyron speedys of mine, but thought
it too much effort to try and upstream, especially as it was done as a
change to the actual panel info:
https://github.com/urjaman/linux/commit/23d46278911e18df138b7adde1bebc23f606baae

The difference would be in this format just setting hfront-porch = 87
and vback-porch = 14.
Anyways the point is: I support moving this mode info into the dts,
and I'd like to know how if at all should i go about getting a
60Hz(ish) mode upstreamed?

-- 
Urja Rannikko