From: "Nicolas Saenz Julienne" <nsaenzjulienne@suse.de> To: "Peter Ujfalusi" <peter.ujfalusi@ti.com>, "Ulf Hansson" <ulf.hansson@linaro.org> Cc: <f.fainelli@gmail.com>, "Catalin Marinas" <catalin.marinas@arm.com>, <linux-kernel@vger.kernel.org>, <linux-rpi-kernel@lists.infradead.org>, "Will Deacon" <will@kernel.org>, <linux-arm-kernel@lists.infradead.org> Subject: Re: [PATCH for-next] arm64: defconfig: Set bcm2835-dma as built-in Date: Fri, 24 Jan 2020 12:51:52 +0100 [thread overview] Message-ID: <C0400CAEQS8N.3P1J37PC0KU9F@linux-9qgx> (raw) In-Reply-To: <adf69613-518f-db01-c1c1-8d3fda4b5182@ti.com> Hi Peter, On Fri Jan 24, 2020 at 1:31 PM, Peter Ujfalusi wrote: > Hi Nicolas, > > On 24/01/2020 13.17, Nicolas Saenz Julienne wrote: > > With the introduction of 738987a1d6f1 ("mmc: bcm2835: Use > > dma_request_chan() instead dma_request_slave_channel()") sdhost-bcm2835 > > now waits for its DMA channel to be available when defined in the > > device-tree (it would previously default to PIO). Albeit the right > > behaviour, the MMC host is needed for booting. So this makes sure the > > DMA channel shows up in time. > > > > Fixes: 738987a1d6f1 ("mmc: bcm2835: Use dma_request_chan() instead dma_request_slave_channel()") > > it is not a bug, it is a feature ;) Agree, I'm just afraid of your series being picked up by a stable release without this patch. But maybe it's not necessary? > Yes, if a driver have DMA binding and it is needed during boot then the > DMA driver also needs to be built in. > I believe it is desired to use DMA instead of PIO in any case for MMC > and in the past bcm2835 did not used DMA if DMA was module and the MMC > was built in. > > Sorry for the inconvenience this change has caused to bcm2835! Not at all :) > Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Thanks, Nicolas
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From: "Nicolas Saenz Julienne" <nsaenzjulienne@suse.de> To: "Peter Ujfalusi" <peter.ujfalusi@ti.com>, "Ulf Hansson" <ulf.hansson@linaro.org> Cc: f.fainelli@gmail.com, Catalin Marinas <catalin.marinas@arm.com>, linux-kernel@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, Will Deacon <will@kernel.org>, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH for-next] arm64: defconfig: Set bcm2835-dma as built-in Date: Fri, 24 Jan 2020 12:51:52 +0100 [thread overview] Message-ID: <C0400CAEQS8N.3P1J37PC0KU9F@linux-9qgx> (raw) In-Reply-To: <adf69613-518f-db01-c1c1-8d3fda4b5182@ti.com> Hi Peter, On Fri Jan 24, 2020 at 1:31 PM, Peter Ujfalusi wrote: > Hi Nicolas, > > On 24/01/2020 13.17, Nicolas Saenz Julienne wrote: > > With the introduction of 738987a1d6f1 ("mmc: bcm2835: Use > > dma_request_chan() instead dma_request_slave_channel()") sdhost-bcm2835 > > now waits for its DMA channel to be available when defined in the > > device-tree (it would previously default to PIO). Albeit the right > > behaviour, the MMC host is needed for booting. So this makes sure the > > DMA channel shows up in time. > > > > Fixes: 738987a1d6f1 ("mmc: bcm2835: Use dma_request_chan() instead dma_request_slave_channel()") > > it is not a bug, it is a feature ;) Agree, I'm just afraid of your series being picked up by a stable release without this patch. But maybe it's not necessary? > Yes, if a driver have DMA binding and it is needed during boot then the > DMA driver also needs to be built in. > I believe it is desired to use DMA instead of PIO in any case for MMC > and in the past bcm2835 did not used DMA if DMA was module and the MMC > was built in. > > Sorry for the inconvenience this change has caused to bcm2835! Not at all :) > Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Thanks, Nicolas _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-01-24 11:55 UTC|newest] Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-01-24 11:17 [PATCH for-next] arm64: defconfig: Set bcm2835-dma as built-in Nicolas Saenz Julienne 2020-01-24 11:17 ` Nicolas Saenz Julienne 2020-01-24 11:31 ` Peter Ujfalusi 2020-01-24 11:31 ` Peter Ujfalusi 2020-01-24 11:51 ` Nicolas Saenz Julienne [this message] 2020-01-24 11:51 ` Nicolas Saenz Julienne 2020-01-24 12:05 ` Peter Ujfalusi 2020-01-24 12:05 ` Peter Ujfalusi 2020-01-24 14:47 ` Nicolas Saenz Julienne 2020-01-24 14:47 ` Nicolas Saenz Julienne 2020-01-24 18:07 ` Peter Ujfalusi 2020-01-24 18:07 ` Peter Ujfalusi 2020-01-29 0:50 ` Florian Fainelli 2020-01-29 0:50 ` Florian Fainelli
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