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[213.161.3.76]) by smtp.gmail.com with ESMTPSA id l8-20020a1ced08000000b0039744bd664esm19254682wmh.13.2022.06.20.11.28.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Jun 2022 11:28:47 -0700 (PDT) From: Jernej =?utf-8?B?xaBrcmFiZWM=?= To: Chen-Yu Tsai , Vinod Koul , Samuel Holland Cc: Samuel Holland , dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-sunxi@lists.linux.dev Subject: Re: [PATCH] dmaengine: sun6i: Set the maximum segment size Date: Mon, 20 Jun 2022 20:28:46 +0200 Message-ID: <3494277.R56niFO833@kista> In-Reply-To: <20220617034209.57337-1-samuel@sholland.org> References: <20220617034209.57337-1-samuel@sholland.org> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Dne petek, 17. junij 2022 ob 05:42:09 CEST je Samuel Holland napisal(a): > The sun6i DMA engine supports segment sizes up to 2^25-1 bytes. This is > explicitly stated in newer SoC documentation (H6, D1), and it is implied > in older documentation by the 25-bit width of the "bytes left in the > current segment" register field. At least A10 user manual says 128k max in description for Byte Counter register (0x100+N*0x20+0xC), although field size is defined as 23:0, but that's still less than 2^25-1. A20 supports only 128k too according to manual. New quirk should be introduced for this. Best regards, Jernej > > Exposing the real segment size limit (instead of the 64k default) > reduces the number of SG list segments needed for a transaction. > > Signed-off-by: Samuel Holland > --- > Tested on A64, verified that the maximum ALSA PCM period increased, and > that audio playback still worked. > > drivers/dma/sun6i-dma.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c > index b7557f437936..1425f87d97b7 100644 > --- a/drivers/dma/sun6i-dma.c > +++ b/drivers/dma/sun6i-dma.c > @@ -9,6 +9,7 @@ > > #include > #include > +#include > #include > #include > #include > @@ -1334,6 +1335,8 @@ static int sun6i_dma_probe(struct platform_device *pdev) > INIT_LIST_HEAD(&sdc->pending); > spin_lock_init(&sdc->lock); > > + dma_set_max_seg_size(&pdev->dev, DMA_BIT_MASK(25)); > + > dma_cap_set(DMA_PRIVATE, sdc->slave.cap_mask); > dma_cap_set(DMA_MEMCPY, sdc->slave.cap_mask); > dma_cap_set(DMA_SLAVE, sdc->slave.cap_mask); > -- > 2.35.1 > >