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Date:   Mon, 17 Oct 2022 10:34:20 +0100
From:   Paul Cercueil <paul@crapouillou.net>
Subject: Re: [PATCH v2 2/2] dmaengine: JZ4780: Add support for the JZ4755.
To:     Siarhei Volkau <lis8215@gmail.com>
Cc:     Vinod Koul <vkoul@kernel.org>, Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        dmaengine@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org
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In-Reply-To: <20221016151256.3021729-3-lis8215@gmail.com>
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        <20221016151256.3021729-3-lis8215@gmail.com>
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Hi Siarhei,

Le dim., oct. 16 2022 at 18:12:56 +0300, Siarhei Volkau=20
<lis8215@gmail.com> a =E9crit :
> The JZ4755 has 4 DMA channels per DMA unit, two idential DMA units.
>=20
> The JZ4755 has the similar DMA engine to JZ4725b, so I assume it has=20
> the
> same bug as JZ4725b, see commit a40c94be2336.

Can you verify that?

It should be pretty simple, if it has the bug you'll see I/O errors on=20
the SD card.

Cheers,
-Paul

> Signed-off-by: Siarhei Volkau <lis8215@gmail.com>
> ---
>  drivers/dma/dma-jz4780.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>=20
> diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c
> index 2a483802d..9c1a6e9a9 100644
> --- a/drivers/dma/dma-jz4780.c
> +++ b/drivers/dma/dma-jz4780.c
> @@ -1038,6 +1038,13 @@ static const struct jz4780_dma_soc_data=20
> jz4725b_dma_soc_data =3D {
>  		 JZ_SOC_DATA_BREAK_LINKS,
>  };
>=20
> +static const struct jz4780_dma_soc_data jz4755_dma_soc_data =3D {
> +	.nb_channels =3D 4,
> +	.transfer_ord_max =3D 5,
> +	.flags =3D JZ_SOC_DATA_PER_CHAN_PM | JZ_SOC_DATA_NO_DCKES_DCKEC |
> +		 JZ_SOC_DATA_BREAK_LINKS,
> +};
> +
>  static const struct jz4780_dma_soc_data jz4760_dma_soc_data =3D {
>  	.nb_channels =3D 5,
>  	.transfer_ord_max =3D 6,
> @@ -1101,6 +1108,7 @@ static const struct jz4780_dma_soc_data=20
> x1830_dma_soc_data =3D {
>  static const struct of_device_id jz4780_dma_dt_match[] =3D {
>  	{ .compatible =3D "ingenic,jz4740-dma", .data =3D &jz4740_dma_soc_data=20
> },
>  	{ .compatible =3D "ingenic,jz4725b-dma", .data =3D=20
> &jz4725b_dma_soc_data },
> +	{ .compatible =3D "ingenic,jz4755-dma", .data =3D &jz4755_dma_soc_data=20
> },
>  	{ .compatible =3D "ingenic,jz4760-dma", .data =3D &jz4760_dma_soc_data=20
> },
>  	{ .compatible =3D "ingenic,jz4760-mdma", .data =3D=20
> &jz4760_mdma_soc_data },
>  	{ .compatible =3D "ingenic,jz4760-bdma", .data =3D=20
> &jz4760_bdma_soc_data },
> --
> 2.36.1
>=20