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Date: Tue, 9 Dec 2014 11:54:26 +0000 From: Catalin Marinas <catalin.marinas@....com> To: Russell King - ARM Linux <linux@....linux.org.uk> Cc: Arend van Spriel <arend@...adcom.com>, Arnd Bergmann <arnd@...db.de>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, brcm80211-dev-list <brcm80211-dev-list@...adcom.com>, linux-wireless <linux-wireless@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Will Deacon <Will.Deacon@....com>, Hante Meuleman <meuleman@...adcom.com>, "hauke@...ke-m.de" <hauke@...ke-m.de>, David Miller <davem@...emloft.net>, Marek Szyprowski <m.szyprowski@...sung.com> Subject: Re: using DMA-API on ARM On Tue, Dec 09, 2014 at 10:29:05AM +0000, Russell King - ARM Linux wrote: > On Tue, Dec 09, 2014 at 11:19:40AM +0100, Arend van Spriel wrote: > > The issue did not trigger overnight so it seems setting bit 22 <Shared > > Attribute _Override_ Enable> solves the issue over here. Now the question is > > how to move forward with this. As I understood from Catalin this patch was > > not included as it was not considered responsibility of the linux kernel. > > It is preferable for firmware to configure the L2 cache appropriately, > which includes things like the prefetch offsets as well as feature bits > like bit 22. > > I think what I'll do is queue up a patch which adds a warning if bit 22 > is not set, suggesting that firmware is updated to set this bit. I'm fine with a (big) warning on this bit. But when you boot in secure mode on 32-bit, do we still have a read/modify/write sequence for L2X0_AUX_CTRL? A quick look at l2c310_enable() didn't reveal this (the code has changed since I proposed the bit 22 setting patch). -- Catalin -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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