linux-kernel - Re: [PATCH AUTOSEL 5.15 123/188] drm/tegra: dc: rgb: Allow changing PLLD rate on Tegra30+

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Date:   Tue, 18 Jan 2022 12:37:51 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Cc:     Maxim Schwalm <maxim.schwalm@...il.com>,
        Thierry Reding <treding@...dia.com>, thierry.reding@...il.com,
        airlied@...ux.ie, daniel@...ll.ch, jonathanh@...dia.com,
        dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.15 123/188] drm/tegra: dc: rgb: Allow changing
 PLLD rate on Tegra30+

18.01.2022 05:30, Sasha Levin пишет:
> From: Dmitry Osipenko <digetx@...il.com>
> 
> [ Upstream commit 0c921b6d4ba06bc899fd84d3ce1c1afd3d00bc1c ]
> 
> Asus Transformer TF700T is a Tegra30 tablet device which uses RGB->DSI
> bridge that requires a precise clock rate in order to operate properly.
> Tegra30 has a dedicated PLL for each display controller, hence the PLL
> rate can be changed freely. Allow PLL rate changes on Tegra30+ for RGB
> output. Configure the clock rate before display controller is enabled
> since DC itself may be running off this PLL and it's not okay to change
> the rate of the active PLL that doesn't support dynamic frequency
> switching since hardware will hang.
> 
> Tested-by: Maxim Schwalm <maxim.schwalm@...il.com> #TF700T
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> Signed-off-by: Thierry Reding <treding@...dia.com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>  drivers/gpu/drm/tegra/dc.c  | 27 ++++++++++++--------
>  drivers/gpu/drm/tegra/dc.h  |  1 +
>  drivers/gpu/drm/tegra/rgb.c | 49 +++++++++++++++++++++++++++++++++++--
>  3 files changed, 65 insertions(+), 12 deletions(-)

Hi,

This patch shouldn't be ported to any stable kernel because h/w that
needs this patch was just merged to the 5.17.