linux-kernel - Re: [PATCH] Revert "drm/sun4i: add lvds mode

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Date:   Mon, 23 Apr 2018 11:21:19 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     megous@...ous.com
Cc:     dev@...ux-sunxi.org, David Airlie <airlied@...ux.ie>,
        Chen-Yu Tsai <wens@...e.org>,
        "open list:DRM DRIVERS FOR ALLWINNER A10" 
        <dri-devel@...ts.freedesktop.org>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "drm/sun4i: add lvds mode_valid function"

On Sat, Apr 21, 2018 at 06:51:55AM +0200, megous@...ous.com wrote:
> From: Ondrej Jirman <megous@...ous.com>
> 
> The reverted commit broke LVDS output on TBS A711 Tablet. That tablet
> has simple-panel node that has fixed pixel clock-frequency that A83T
> SoC used in the tablet can't generate exactly.
> 
> Requested rate is 52000000 and rounded_rate is calculated as 51857142.
> It's close enough for it to work in practice, but with strict check
> in the reverted commit, the mode is rejected needlessly in this case.
> 
> DT allows to specify a range of values for simple-panel/clock-frequency,
> but driver doesn't respect that ATM. Given that TBS A711 is the single
> user of sun4i-lvds driver, let's revert that commit for now, until
> a better solution for the problem is found.
> 
> Also see: https://patchwork.kernel.org/patch/9446385/ for relevant
> discussion (or search for "[RFC] drm/sun4i: rgb: Add 5% tolerance
> to dot clock frequency check").
> 
> Fixes: e4e4b7ad50cf ("drm/sun4i: add lvds mode_valid function")
> Reported-by: Ondrej Jirman <megous@...ous.com>
> Signed-off-by: Ondrej Jirman <megous@...ous.com>

Applied, thanks!
Maxime
-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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