linux-kernel - Re: [PATCH v2 1/1] irqchip/GICv2m: Add workaround for APM X-Gene GICv2m erratum

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Message-ID: <5614C5C6.5090207@arm.com>
Date:	Wed, 07 Oct 2015 08:12:06 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Duc Dang <dhdang@....com>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Jason Cooper <jason@...edaemon.net>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	linux-kernel@...r.kernel.org,
	linux-arm <linux-arm-kernel@...ts.infradead.org>, patches@....com
Subject: Re: [PATCH v2 1/1] irqchip/GICv2m: Add workaround for APM X-Gene
 GICv2m erratum

On 06/10/15 23:32, Duc Dang wrote:
> APM X-Gene GICv2m implementation has an erratum where the
> MSI data needs to be the offset from the spi_start in order to
> trigger the correct MSI interrupt. This is different from the
> standard GICv2m implementation where the MSI data is the absolute
> value within the range from spi_start to (spi_start + num_spis)
> of each v2m frame.
> 
> This patch reads MSI_IIDR register (present in all GICv2m
> implementations) to identify X-Gene GICv2m implementation and
> apply workaround to change the data portion of MSI vector.
> 
> Signed-off-by: Duc Dang <dhdang@....com>

Reviewed-by: Marc Zyngier <marc.zyngier@....com>

	M.
-- 
Jazz is not dead. It just smells funny...
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