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[2003:f6:ef1b:2000:944c:cbc7:1e1c:2c47]) by smtp.gmail.com with ESMTPSA id i23-20020a170906265700b00a44dca5f9c1sm2512075ejc.100.2024.03.04.03.07.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 Mar 2024 03:07:34 -0800 (PST) Message-ID: Subject: Re: [PATCH v7 1/6] dmaengine: Add API function dmaengine_prep_peripheral_dma_vec() From: Nuno =?ISO-8859-1?Q?S=E1?= To: Nuno Sa , Vinod Koul , Lars-Peter Clausen , Jonathan Cameron , Sumit Semwal , Christian =?ISO-8859-1?Q?K=F6nig?= , Jonathan Corbet , Paul Cercueil Cc: Daniel Vetter , Michael Hennerich , linux-doc@vger.kernel.org, dmaengine@vger.kernel.org, linux-iio@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org Date: Mon, 04 Mar 2024 12:10:58 +0100 In-Reply-To: <20240223-iio-dmabuf-v7-1-78cfaad117b9@analog.com> References: <20240223-iio-dmabuf-v7-0-78cfaad117b9@analog.com> <20240223-iio-dmabuf-v7-1-78cfaad117b9@analog.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2024-02-23 at 13:13 +0100, Nuno Sa wrote: > From: Paul Cercueil >=20 > This function can be used to initiate a scatter-gather DMA transfer, > where the address and size of each segment is located in one entry of > the dma_vec array. >=20 > The major difference with dmaengine_prep_slave_sg() is that it supports > specifying the lengths of each DMA transfer; as trying to override the > length of the transfer with dmaengine_prep_slave_sg() is a very tedious > process. The introduction of a new API function is also justified by the > fact that scatterlists are on their way out. >=20 > Note that dmaengine_prep_interleaved_dma() is not helpful either in that > case, as it assumes that the address of each segment will be higher than > the one of the previous segment, which we just cannot guarantee in case > of a scatter-gather transfer. >=20 > Signed-off-by: Paul Cercueil > Signed-off-by: Nuno Sa > --- Hi Vinod, Is this already good for you? I do not want to be pushy but we're trying to= see if we can have this in the 6.9 cycle and Jonathan definitely wants an ack f= rom you before merging this in his tree. I've more or less till Wednesday so th= at's why I'm asking already today so I still have time to re-spin if you want so= me changes. - Nuno S=C3=A1