linux-kernel - Re: [PATCH 4/6] drm: bridge: samsung-dsim: Dynamically configure DPHY timing

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Date:   Mon, 17 Apr 2023 00:12:29 +0200
From:   Marek Vasut <marex@...x.de>
To:     Adam Ford <aford173@...il.com>, dri-devel@...ts.freedesktop.org
Cc:     m.szyprowski@...sung.com, aford@...conembedded.com,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Inki Dae <inki.dae@...sung.com>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] drm: bridge: samsung-dsim: Dynamically configure DPHY
 timing

On 4/15/23 12:41, Adam Ford wrote:
> NXP uses a lookup table to determine the various values for
> the PHY Timing based on the clock rate in their downstream
> kernel.  Since the input clock can be variable, the phy
> settings need to be variable too.  Add an additional variable
> to the driver data to enable this feature to prevent breaking
> boards that don't support it.

Isn't there already a generic LP2HS transition time calculation in the 
kernel ?

This looks like a generic calculation which should be done by all the 
DSI hosts, so why not introduce a generic helper to do such a 
calculation (and not a table please) ?