linux-kernel - Re: [PATCH v6 0/6] Fix support of dw-edma HDMA NATIVE IP in remote setup

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Date:   Tue, 21 Nov 2023 17:38:28 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Serge Semin <fancer.lancer@...il.com>
Cc:     Kory Maincent <kory.maincent@...tlin.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>,
        Cai Huoqing <cai.huoqing@...ux.dev>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        Herve Codina <herve.codina@...tlin.com>
Subject: Re: [PATCH v6 0/6] Fix support of dw-edma HDMA NATIVE IP in remote
 setup

On Tue, Nov 21, 2023 at 01:55:22PM +0300, Serge Semin wrote:
> Hi Mani
> 
> On Tue, Nov 21, 2023 at 11:56:29AM +0530, Manivannan Sadhasivam wrote:
> > On Fri, Nov 17, 2023 at 11:03:48AM +0100, Kory Maincent wrote:
> > > This patch series fix the support of dw-edma HDMA NATIVE IP.
> > > I can only test it in remote HDMA IP setup with single dma transfer, but
> > > with these fixes it works properly.
> > > 
> > > Few fixes has also been added for eDMA version. Similarly to HDMA I have
> > > tested only eDMA in remote setup.
> > > 
> > 
> > Just out of curiosity, can you share how you are setting EDMA_MF_HDMA_NATIVE?
> 
> This topic has already been concerned on v1 (in another context
> though):
> https://lore.kernel.org/dmaengine/20230621151948.36125997@kmaincent-XPS-13-7390/
> 
> Here is the repo with the out-of-tree driver Kory said he was using
> together with the kernel's version of the DW eDMA/hDMA driver:
> https://github.com/Brainchip-Inc/akida_dw_edma
> 

Thanks Sergey, I missed it! But looks like we are not focusing on the HDMA
integration in designware-ep.c. Have you/anyone thought about it? Was it
discussed previously that I missed?

HDMA is used in one of the recent Qcom SoCs (SA8775) that Qcom folks are
bringing up and I'd like to have a common solution like we have for eDMA.

- Mani

> -Serge(y)
> 
> > 
> > - Mani
> > 
> > > Changes in v2:
> > > - Update comments and fix typos.
> > > - Removed patches that tackle hypothetical bug and then were not pertinent.
> > > - Add the similar HDMA race condition in remote setup fix to eDMA IP driver.
> > > 
> > > Changes in v3:
> > > - Fix comment style.
> > > - Split a patch in two to differ bug fix and simple harmless typo.
> > > 
> > > Changes in v4:
> > > - Update patch git commit message.
> > > - Link to v3: https://lore.kernel.org/r/20231011-b4-feature_hdma_mainline-v3-0-24ee0c979c6f@bootlin.com
> > > 
> > > Changes in v5:
> > > - No change
> > > - Rebase to mainline 6.7-rc1
> > > - Link to v4: https://lore.kernel.org/r/20231011-b4-feature_hdma_mainline-v4-0-43d417b93138@bootlin.com
> > > 
> > > Changes in v6:
> > > - Fix several commit messages and comments.
> > > - Link to v5: https://lore.kernel.org/r/20231114-b4-feature_hdma_mainline-v5-0-7bc86d83c6f7@bootlin.com
> > > 
> > > Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
> > > ---
> > > Kory Maincent (6):
> > >       dmaengine: dw-edma: Fix the ch_count hdma callback
> > >       dmaengine: dw-edma: Fix wrong interrupt bit set for HDMA
> > >       dmaengine: dw-edma: HDMA_V0_REMOTEL_STOP_INT_EN typo fix
> > >       dmaengine: dw-edma: Add HDMA remote interrupt configuration
> > >       dmaengine: dw-edma: HDMA: Add sync read before starting the DMA transfer in remote setup
> > >       dmaengine: dw-edma: eDMA: Add sync read before starting the DMA transfer in remote setup
> > > 
> > >  drivers/dma/dw-edma/dw-edma-v0-core.c | 17 +++++++++++++++
> > >  drivers/dma/dw-edma/dw-hdma-v0-core.c | 39 +++++++++++++++++++++++------------
> > >  drivers/dma/dw-edma/dw-hdma-v0-regs.h |  2 +-
> > >  3 files changed, 44 insertions(+), 14 deletions(-)
> > > ---
> > > base-commit: b85ea95d086471afb4ad062012a4d73cd328fa86
> > > change-id: 20231011-b4-feature_hdma_mainline-b6c57f8e3b5d
> > > 
> > > Best regards,
> > > -- 
> > > Köry Maincent, Bootlin
> > > Embedded Linux and kernel engineering
> > > https://bootlin.com
> > > 
> > 
> > -- 
> > மணிவண்ணன் சதாசிவம்

-- 
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