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Message-ID: <tencent_E30BB769A8609EADCF03F1FDA7C0AF146205@qq.com> Date: Mon, 3 Jan 2022 20:21:25 +0800 From: Conley Lee <conleylee@...mail.com> To: Corentin Labbe <clabbe.montjoie@...il.com> Cc: davem@...emloft.net, mripard@...nel.org, wens@...e.org, jernej.skrabec@...il.com, netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org Subject: Re: [PATCH v6] sun4i-emac.c: add dma support On 01/03/22 at 12:42下午, Corentin Labbe wrote: > Date: Mon, 3 Jan 2022 12:42:58 +0100 > From: Corentin Labbe <clabbe.montjoie@...il.com> > To: Conley Lee <conleylee@...mail.com> > Cc: davem@...emloft.net, mripard@...nel.org, wens@...e.org, > jernej.skrabec@...il.com, netdev@...r.kernel.org, > linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev, > linux-kernel@...r.kernel.org > Subject: Re: [PATCH v6] sun4i-emac.c: add dma support > > Le Mon, Jan 03, 2022 at 10:55:04AM +0800, Conley Lee a écrit : > > On 01/02/22 at 06:38下午, Corentin Labbe wrote: > > > Date: Sun, 2 Jan 2022 18:38:51 +0100 > > > From: Corentin Labbe <clabbe.montjoie@...il.com> > > > To: Conley Lee <conleylee@...mail.com> > > > Cc: davem@...emloft.net, kuba@...nel.org, mripard@...nel.org, > > > wens@...e.org, netdev@...r.kernel.org, > > > linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, > > > linux-sunxi@...ts.linux.dev, jernej.skrabec@...il.com > > > Subject: Re: [PATCH v6] sun4i-emac.c: add dma support > > > > > > Le Sat, Jan 01, 2022 at 03:09:01PM +0800, Conley Lee a écrit : > > > > On 12/31/21 at 11:43上午, Corentin Labbe wrote: > > > > > Date: Fri, 31 Dec 2021 11:43:53 +0100 > > > > > From: Corentin Labbe <clabbe.montjoie@...il.com> > > > > > To: conleylee@...mail.com > > > > > Cc: davem@...emloft.net, kuba@...nel.org, mripard@...nel.org, > > > > > wens@...e.org, netdev@...r.kernel.org, > > > > > linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org > > > > > Subject: Re: [PATCH v6] sun4i-emac.c: add dma support > > > > > > > > > > Le Wed, Dec 29, 2021 at 09:43:51AM +0800, conleylee@...mail.com a écrit : > > > > > > From: Conley Lee <conleylee@...mail.com> > > > > > > > > > > > > Thanks for your review. Here is the new version for this patch. > > > > > > > > > > > > This patch adds support for the emac rx dma present on sun4i. The emac > > > > > > is able to move packets from rx fifo to RAM by using dma. > > > > > > > > > > > > Change since v4. > > > > > > - rename sbk field to skb > > > > > > - rename alloc_emac_dma_req to emac_alloc_dma_req > > > > > > - using kzalloc(..., GPF_ATOMIC) in interrupt context to avoid > > > > > > sleeping > > > > > > - retry by using emac_inblk_32bit when emac_dma_inblk_32bit fails > > > > > > - fix some code style issues > > > > > > > > > > > > Change since v5. > > > > > > - fix some code style issue > > > > > > > > > > > > > > > > Hello > > > > > > > > > > I just tested this on a sun4i-a10-olinuxino-lime > > > > > > > > > > I got: > > > > > [ 2.922812] sun4i-emac 1c0b000.ethernet (unnamed net_device) (uninitialized): get io resource from device: 0x1c0b000, size = 4096 > > > > > [ 2.934512] sun4i-emac 1c0b000.ethernet (unnamed net_device) (uninitialized): failed to request dma channel. dma is disabled > > > > > [ 2.945740] sun4i-emac 1c0b000.ethernet (unnamed net_device) (uninitialized): configure dma failed. disable dma. > > > > > [ 2.957887] sun4i-emac 1c0b000.ethernet: eth0: at (ptrval), IRQ 19 MAC: 02:49:09:40:ab:3d > > > > > > > > > > On which board did you test it and how ? > > > > > > > > > > Regards > > > > > > > > Sorry. I sent the email with text/html format. This email is an clean version. > > > > > > > > In order to enable dma rx channel. `dmas` and `dma-names` properties > > > > should be added to emac section in dts: > > > > > > > > emac: ethernet@...b000 { > > > > ... > > > > dmas = <&dma SUN4I_DMA_DEDICATED 7>; > > > > dma-names = "rx"; > > > > ... > > > > } > > > > > > Helo > > > > > > Yes I figured that out. But you should have done a patch serie adding this. > > > Your patch is now applied but it is a useless change without the dtb change. > > > You should also probably update the driver binding (Documentation/devicetree/bindings/net/allwinner,sun4i-a10-emac.yaml) since you add new members to DT node. > > > > > > Furthermore, why did you add RX only and not TX dma also ? > > > > > > Probably it is too late since patch is applied but it is: > > > Tested-by: Corentin Labbe <clabbe.montjoie@...il.com> > > > Tested-on: sun4i-a10-olinuxino-lime > > > > > > Regards > > > > Thanks for your suggestion. I will submit a patch to add those changes > > later. > > > > And the reason why I didn't add TX support is becasuse there is no any > > public page to describe sun4i emac TX DMA register map. So, I don't known > > how to enable TX DMA at hardware level. If you has any page or datasheet > > about EMAC TX DMA, can you share with me ? Thanks. > > Hello > > You can find TX DMA info on the R40 Use manual (8.10.5.2 Register Name: EMAC_TX_MODE) > > You should keep all people in CC when you answer to someone. > > Regards Haha, got it! I have been looking for the docs about emac register map for a long time. You really help me a lot. I will submit a new patch to add driver bidding and enable both RX and TX channels. Thanks ~
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