linux-kernel - Re: [PATCH V3 6/7] drm: bridge: samsung-dsim: Support non-burst mode

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Message-ID: <d7d435be-e178-2666-f83e-af3b6cc37137@kontron.de>
Date:   Wed, 3 May 2023 17:43:05 +0200
From:   Frieder Schrempf <frieder.schrempf@...tron.de>
To:     Adam Ford <aford173@...il.com>, dri-devel@...ts.freedesktop.org
Cc:     marex@...x.de, Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Jonas Karlman <jonas@...boo.se>, aford@...conembedded.com,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        linux-kernel@...r.kernel.org,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Chen-Yu Tsai <wenst@...omium.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Jagan Teki <jagan@...rulasolutions.com>
Subject: Re: [PATCH V3 6/7] drm: bridge: samsung-dsim: Support non-burst mode

On 02.05.23 03:07, Adam Ford wrote:
> The high-speed clock is hard-coded to the burst-clock
> frequency specified in the device tree.  However, when
> using devices like certain bridge chips without burst mode
> and varying resolutions and refresh rates, it may be
> necessary to set the high-speed clock dynamically based
> on the desired pixel clock for the connected device.
> 
> This also removes the need to set a clock speed from
> the device tree for non-burst mode operation, since the
> pixel clock rate is the rate requested from the attached
> device like an HDMI bridge chip.  This should have no
> impact for people using burst-mode and setting the burst
> clock rate is still required for those users.
> 
> Signed-off-by: Adam Ford <aford173@...il.com>
> Tested-by: Chen-Yu Tsai <wenst@...omium.org>

Tested on Kontron BL i.MX8MM with SN65DSI84 and ADV7535 bridges.

Tested-by: Frieder Schrempf <frieder.schrempf@...tron.de>
Reviewed-by: Frieder Schrempf <frieder.schrempf@...tron.de>