From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vinod Koul Subject: Re: [PATCH v2 1/3] dmaengine: add DMA_PREP_CMD for non-Data descriptors. Date: Wed, 19 Jul 2017 15:41:23 +0530 Message-ID: <20170719101122.GH3053@localhost> References: <1498481369-29497-1-git-send-email-absahu@codeaurora.org> <1498481369-29497-2-git-send-email-absahu@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Abhishek Sahu Cc: andy.gross@linaro.org, david.brown@linaro.org, dan.j.williams@intel.com, linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-arm-msm@vger.kernel.org On Mon, Jul 17, 2017 at 02:54:21PM +0530, Abhishek Sahu wrote: > On 2017-06-26 18:19, Abhishek Sahu wrote: > >Some of the DMA controllers are capable of issuing the commands > >to peripheral by the DMA. These commands can be list of register > >reads/writes and its different from normal data reads/writes. > >This patch adds new flag DMA_PREP_CMD in DMA API which tells > >the driver that the data passed to DMA API is in command format > >and DMA driver will form descriptor in the required format. > > > >This flag can be used by any DMA controller driver which requires > >special handling for non-Data descriptors. > > > >Signed-off-by: Abhishek Sahu > >--- > > include/linux/dmaengine.h | 3 +++ > > 1 file changed, 3 insertions(+) > > > >diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h > >index 5336808..bbc297e 100644 > >--- a/include/linux/dmaengine.h > >+++ b/include/linux/dmaengine.h > >@@ -186,6 +186,8 @@ struct dma_interleaved_template { > > * on the result of this operation > > * @DMA_CTRL_REUSE: client can reuse the descriptor and submit again till > > * cleared or freed > >+ * @DMA_PREP_CMD: tell the driver that the data passed to DMA API is in > >command > >+ * format and it will be used for configuring the peripheral registers. > > */ > > enum dma_ctrl_flags { > > DMA_PREP_INTERRUPT = (1 << 0), > >@@ -195,6 +197,7 @@ enum dma_ctrl_flags { > > DMA_PREP_CONTINUE = (1 << 4), > > DMA_PREP_FENCE = (1 << 5), > > DMA_CTRL_REUSE = (1 << 6), > >+ DMA_PREP_CMD = (1 << 7), > > Hi Vinod/Dan, > > Could you please help in reviewing these DMA patches. > I have posted QPIC NAND support patches which are dependent > upon these DMA patches. Please allow reasonable time for review! This patch series was sent just before the merge window and it closed couple of days back!! > > https://www.spinics.net/lists/kernel/msg2545386.html > > > > }; > > > > /** > > -- > Abhishek Sahu -- ~Vinod