linux-kernel - Re: [PATCH v2] ARM: dts: dra7: Add bus_dma

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Date:   Fri, 13 Mar 2020 07:41:36 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Roger Quadros <rogerq@...com>
Cc:     hch@....de, robin.murphy@....com, robh+dt@...nel.org, nm@...com,
        t-kristo@...com, nsekhar@...com, linux-omap@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...nel.org
Subject: Re: [PATCH v2] ARM: dts: dra7: Add bus_dma_limit for L3 bus

* Roger Quadros <rogerq@...com> [200313 02:48]:
> The L3 interconnect's memory map is from 0x0 to
> 0xffffffff. Out of this, System memory (SDRAM) can be
> accessed from 0x80000000 to 0xffffffff (2GB)
> 
> DRA7 does support 4GB of SDRAM but upper 2GB can only be
> accessed by the MPU subsystem.
> 
> Add the dma-ranges property to reflect the physical address limit
> of the L3 bus.
> 
> Issues ere observed only with SATA on DRA7-EVM with 4GB RAM
> and CONFIG_ARM_LPAE enabled. This is because the controller
> supports 64-bit DMA and its driver sets the dma_mask to 64-bit
> thus resulting in DMA accesses beyond L3 limit of 2G.
> 
> Setting the correct bus_dma_limit fixes the issue.

Thanks applying into fixes.

Tony