linux-kernel - Re: [PATCH v2] video: ARM CLCD: Fix calculation of bits-per-pixel

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Date:	Wed, 20 Aug 2014 14:03:07 +0100
From:	Pawel Moll <pawel.moll@....com>
To:	"Jon Medhurst (Tixy)" <tixy@...aro.org>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] video: ARM CLCD: Fix calculation of bits-per-pixel

On Wed, 2014-08-20 at 13:41 +0100, Jon Medhurst (Tixy) wrote:
> If the device-tree specifies a max-memory-bandwidth property then the
> CLCD driver uses that to calculate the bits-per-pixel supported,
> however, this calculation is faulty for two reasons.
> 
> 1. It doesn't ensure that the result is a sane value, i.e. a power of 2
>    and <= 32 as the rest of the code assumes.
> 
> 2. It uses the displayed resolution and calculates the average bandwidth
>    across the whole frame. It should instead calculate the peak
>    bandwidth based on the pixel clock.
> 
> This patch fixes both the above.
> 
> Signed-off-by: Jon Medhurst <tixy@...aro.org>

Acked-by: Pawel Moll <pawel.moll@....com>

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