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From: Vinod Koul <vkoul@kernel.org>
To: Mark Brown <broonie@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>,
	Wolfram Sang <wsa@kernel.org>,
	linux-arm-msm@vger.kernel.org, Andy Gross <agross@kernel.org>,
	Matthias Kaehlcke <mka@chromium.org>,
	Douglas Anderson <dianders@chromium.org>,
	Sumit Semwal <sumit.semwal@linaro.org>,
	Amit Pundir <amit.pundir@linaro.org>,
	linux-spi@vger.kernel.org, linux-i2c@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/7] spi: spi-geni-qcom: Add support for GPI dma
Date: Wed, 16 Jun 2021 17:32:36 +0530	[thread overview]
Message-ID: <YMnoXKAvL0461GRR@vkoul-mobl> (raw)
In-Reply-To: <20210616113505.GB6418@sirena.org.uk>

On 16-06-21, 12:35, Mark Brown wrote:
> On Wed, Jun 16, 2021 at 02:20:45PM +0530, Vinod Koul wrote:
> 
> > Looking at the code, that is ideal case. Only issue I can see is that
> > core DMA mapping device being used is incorrect. The core would use
> > ctlr->dev.parent which is the spi0 device here.
> 
> Why would the parent of the controller be a SPI device?

Sorry my bad, I meant the core use ctlr->dev.parent which in this case is
the SPI master device, 880000.spi

> > But in this case, that wont work. We have a parent qup device which is
> > the parent for both spi and dma device and needs to be used for
> > dma-mapping! 
> 
> > If we allow drivers to set dma mapping device and use that, then I can
> > reuse the core. Let me know if that is agreeable to you and I can hack
> > this up. Maybe add a new member in spi_controller which is filled by
> > drivers in can_dma() callback?
> 
> Possibly, I'd need to see the code.

Ok, let me do a prototype and share ...

Thanks
-- 
~Vinod

  reply	other threads:[~2021-06-16 12:02 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-11 15:16 [PATCH 0/7] Add and enable GPI DMA users Vinod Koul
2021-01-11 15:16 ` [PATCH 1/7] soc: qcom: geni: move GENI_IF_DISABLE_RO to common header Vinod Koul
2021-01-11 15:31   ` Bjorn Andersson
2021-01-11 15:16 ` [PATCH 2/7] soc: qcom: geni: move struct geni_wrapper to header Vinod Koul
2021-01-11 15:34   ` Bjorn Andersson
2021-01-11 17:43     ` Vinod Koul
2021-01-11 18:51       ` Bjorn Andersson
2021-01-11 15:16 ` [PATCH 3/7] soc: qcom: geni: Add support for gpi dma Vinod Koul
2021-01-11 15:40   ` Bjorn Andersson
2021-01-11 17:22     ` Vinod Koul
2021-01-13  0:01   ` Doug Anderson
2021-01-13  3:22     ` Vinod Koul
2021-01-11 15:16 ` [PATCH 4/7] spi: spi-geni-qcom: Add support for GPI dma Vinod Koul
2021-01-11 16:35   ` Mark Brown
2021-06-16  8:50     ` Vinod Koul
2021-06-16 11:35       ` Mark Brown
2021-06-16 12:02         ` Vinod Koul [this message]
2021-06-17  6:20           ` Vinod Koul
2021-01-11 17:19   ` Bjorn Andersson
2021-01-12  7:31   ` Lukas Wunner
2021-01-12 11:02   ` kernel test robot
2021-01-12 11:02     ` kernel test robot
2021-01-13  0:01   ` Doug Anderson
2021-01-13  3:24     ` Vinod Koul
2021-02-04 21:34   ` Dmitry Baryshkov
2021-01-11 15:16 ` [PATCH 5/7] i2c: qcom-geni: Add support for GPI DMA Vinod Koul
2021-01-11 18:14   ` Bjorn Andersson
2021-01-12  5:50     ` Vinod Koul
2021-01-11 15:16 ` [PATCH 6/7] arm64: dts: qcom: sdm845: Add gpi dma node Vinod Koul
2021-01-11 18:23   ` Bjorn Andersson
2021-01-12  4:21     ` Vinod Koul
2021-01-11 15:16 ` [PATCH 7/7] arm64: dts: qcom: sdm845: enable dma for spi Vinod Koul
2021-01-11 16:04   ` Konrad Dybcio
2021-01-11 17:46     ` Vinod Koul
2021-01-11 20:45       ` Konrad Dybcio
2021-01-12  4:19         ` Vinod Koul
2021-01-11 16:47   ` Doug Anderson
2021-01-11 17:56     ` Vinod Koul
2021-01-13  0:01 ` [PATCH 0/7] Add and enable GPI DMA users Doug Anderson
2021-01-13  3:03   ` Vinod Koul
2021-01-11 19:37 [PATCH 4/7] spi: spi-geni-qcom: Add support for GPI dma kernel test robot

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