linux-kernel - Re: [PATCH v7 5/5] ARM: dts: da850: specify the maximum pixel clock rate for tilcdc

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Message-ID: <778cfd63-823c-7bf6-dc9d-0f2dcb43e129@ti.com>
Date:   Mon, 2 Jan 2017 16:59:35 +0530
From:   Sekhar Nori <nsekhar@...com>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Jyri Sarha <jsarha@...com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        David Airlie <airlied@...ux.ie>,
        Kevin Hilman <khilman@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Russell King <linux@...linux.org.uk>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>
CC:     LKML <linux-kernel@...r.kernel.org>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        linux-drm <dri-devel@...ts.freedesktop.org>,
        linux-devicetree <devicetree@...r.kernel.org>
Subject: Re: [PATCH v7 5/5] ARM: dts: da850: specify the maximum pixel clock
 rate for tilcdc

On Tuesday 13 December 2016 03:39 PM, Bartosz Golaszewski wrote:
> At maximum CPU frequency of 300 MHz the maximum pixel clock frequency
> is 37.5 MHz[1]. We must filter out any mode for which the calculated
> pixel clock rate would exceed this value.
> 
> Specify the max-pixelclock property for the display node for
> da850-lcdk.
> 
> [1] http://processors.wiki.ti.com/index.php/OMAP-L1x/C674x/AM1x_LCD_Controller_(LCDC)_Throughput_and_Optimization_Techniques

This wiki page is not really a TI datasheet and can change without
notice. I changed this to refer to
http://www.ti.com/lit/ds/symlink/am1808.pdf (SPRS653E, revised March
2014), table 6-110.

Applied to v4.11/dt

Thanks,
Sekhar