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From:   Liming Sun <lsun@mellanox.com>
To:     Shawn Lin <shawn.lin@rock-chips.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Jaehoon Chung <jh80.chung@samsung.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>
CC:     Ulf Hansson <ulf.hansson@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        "linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@kernel.org" <stable@kernel.org>
Subject: RE: [PATCH v5 1/3] mmc: dw_mmc-bluefield: Add driver extension
Thread-Topic: [PATCH v5 1/3] mmc: dw_mmc-bluefield: Add driver extension
Thread-Index: AQHT4XpUJVX32tueBkqffC2RbR2Y+KQbn2iAgADDW1A=
Date:   Wed, 2 May 2018 12:45:09 +0000
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Please see response inline.

Thanks,
Liming

> -----Original Message-----
> From: Shawn Lin [mailto:shawn.lin@rock-chips.com]
> Sent: Tuesday, May 1, 2018 9:02 PM
> To: Liming Sun <lsun@mellanox.com>; Mark Rutland
> <mark.rutland@arm.com>; Jaehoon Chung <jh80.chung@samsung.com>;
> Catalin Marinas <catalin.marinas@arm.com>; Will Deacon
> <will.deacon@arm.com>
> Cc: Ulf Hansson <ulf.hansson@linaro.org>; Rob Herring
> <robh+dt@kernel.org>; shawn.lin@rock-chips.com; linux-
> mmc@vger.kernel.org; devicetree@vger.kernel.org; linux-
> kernel@vger.kernel.org; stable@kernel.org
> Subject: Re: [PATCH v5 1/3] mmc: dw_mmc-bluefield: Add driver extension
>=20
> On 2018/5/2 2:19, Liming Sun wrote:
> > This commit adds extension to the dw_mmc driver for Mellanox BlueField
> > SoC. It updates the UHS_REG_EXT register to bring up the eMMC card on
> > this SoC.
> >
> > Cc: stable@kernel.org
>=20
> Why?

[Liming] This is recommended value from HW team. Without this setting, the =
eMMC=20
controller and cards can be found in Linux, but not stable. Writing to it c=
ould caused
CRC error.

>=20
> > Signed-off-by: Liming Sun <lsun@mellanox.com>
> > Reviewed-by: David Woods <dwoods@mellanox.com>
> > ---
> >   drivers/mmc/host/Kconfig            |  9 +++++
> >   drivers/mmc/host/Makefile           |  1 +
> >   drivers/mmc/host/dw_mmc-bluefield.c | 72
> +++++++++++++++++++++++++++++++++++++
> >   3 files changed, 82 insertions(+)
> >   create mode 100644 drivers/mmc/host/dw_mmc-bluefield.c
> >
> > diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> > index 9589f9c..26ac6b5 100644
> > --- a/drivers/mmc/host/Kconfig
> > +++ b/drivers/mmc/host/Kconfig
> > @@ -717,6 +717,15 @@ config MMC_DW_K3
> >   	  Synopsys DesignWare Memory Card Interface driver. Select this
> option
> >   	  for platforms based on Hisilicon K3 SoC's.
> >
> > +config MMC_DW_BLUEFIELD
>=20
> And did you have feedback of my comment in V2=1B$B!)=1B(B
> http://lists-archives.com/linux-kernel/29104830-mmc-dw_mmc-bluefield-
> add-driver-extension.html
>=20
> > +	tristate "BlueField specific extensions for Synopsys DW Memory Card
> Interface"
> > +	depends on MMC_DW
> > +	select MMC_DW_PLTFM
> > +	help
> > +	  This selects support for Mellanox BlueField SoC specific extensions
> to
> > +	  the Synopsys DesignWare Memory Card Interface driver. Select this
> > +	  option for platforms based on Mellanox BlueField SoC's.
> > +
> >   config MMC_DW_PCI
> >   	tristate "Synopsys Designware MCI support on PCI bus"
> >   	depends on MMC_DW && PCI
> > diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> > index 6aead24..267b3f1 100644
> > --- a/drivers/mmc/host/Makefile
> > +++ b/drivers/mmc/host/Makefile
> > @@ -55,6 +55,7 @@ obj-$(CONFIG_MMC_DW_K3)		+=3D dw_mmc-
> k3.o
> >   obj-$(CONFIG_MMC_DW_PCI)	+=3D dw_mmc-pci.o
> >   obj-$(CONFIG_MMC_DW_ROCKCHIP)	+=3D dw_mmc-rockchip.o
> >   obj-$(CONFIG_MMC_DW_ZX)		+=3D dw_mmc-zx.o
> > +obj-$(CONFIG_MMC_DW_BLUEFIELD)	+=3D dw_mmc-bluefield.o
> >   obj-$(CONFIG_MMC_SH_MMCIF)	+=3D sh_mmcif.o
> >   obj-$(CONFIG_MMC_JZ4740)	+=3D jz4740_mmc.o
> >   obj-$(CONFIG_MMC_VUB300)	+=3D vub300.o
> > diff --git a/drivers/mmc/host/dw_mmc-bluefield.c
> b/drivers/mmc/host/dw_mmc-bluefield.c
> > new file mode 100644
> > index 0000000..12067b1
> > --- /dev/null
> > +++ b/drivers/mmc/host/dw_mmc-bluefield.c
> > @@ -0,0 +1,72 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2018 Mellanox Technologies.
> > + *
> > + * This program is free software; you can redistribute it and/or modif=
y
> > + * it under the terms of the GNU General Public License as published b=
y
> > + * the Free Software Foundation; either version 2 of the License, or
> > + * (at your option) any later version.
> > + */
> > +
> > +#include <linux/module.h>
> > +#include <linux/io.h>
> > +#include <linux/irq.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/mmc/host.h>
> > +#include <linux/mmc/mmc.h>
> > +#include <linux/of.h>
> > +
> > +#include "dw_mmc.h"
> > +#include "dw_mmc-pltfm.h"
> > +
> > +static void dw_mci_bluefield_set_ios(struct dw_mci *host, struct
> mmc_ios *ios)
> > +{
> > +	u32 regs;
> > +
> > +	/* Set drive=3D4 (bit 29:23) and sample=3D2 (bit 22:16) in UHS_REG_EX=
T.
> */
> > +	regs =3D mci_readl(host, UHS_REG_EXT);
> > +	regs =3D (regs & ~0x3F100000 & ~0x7F0000) | (4 << 23) | (2 << 16);
> > +	mci_writel(host, UHS_REG_EXT, regs);
> > +}
> > +
> > +static const struct dw_mci_drv_data bluefield_drv_data =3D {
> > +	.set_ios		=3D dw_mci_bluefield_set_ios
> > +};
> > +
> > +static const struct of_device_id dw_mci_bluefield_match[] =3D {
> > +	{ .compatible =3D "mellanox,bluefield-dw-mshc",
> > +		.data =3D &bluefield_drv_data },
> > +	{},
> > +};
> > +MODULE_DEVICE_TABLE(of, dw_mci_bluefield_match);
> > +
> > +static int dw_mci_bluefield_probe(struct platform_device *pdev)
> > +{
> > +	const struct dw_mci_drv_data *drv_data =3D NULL;
> > +	const struct of_device_id *match;
> > +
> > +	if (pdev->dev.of_node) {
> > +		match =3D of_match_node(dw_mci_bluefield_match,
> > +				      pdev->dev.of_node);
> > +		drv_data =3D match->data;
> > +	}
> > +
> > +	return dw_mci_pltfm_register(pdev, drv_data);
> > +}
> > +
> > +static struct platform_driver dw_mci_bluefield_pltfm_driver =3D {
> > +	.probe		=3D dw_mci_bluefield_probe,
> > +	.remove		=3D dw_mci_pltfm_remove,
> > +	.driver		=3D {
> > +		.name		=3D "dwmmc_bluefield",
> > +		.of_match_table	=3D dw_mci_bluefield_match,
> > +		.pm		=3D &dw_mci_pltfm_pmops,
> > +	},
> > +};
> > +
> > +module_platform_driver(dw_mci_bluefield_pltfm_driver);
> > +
> > +MODULE_DESCRIPTION("BlueField DW Multimedia Card driver");
> > +MODULE_AUTHOR("Mellanox Technologies");
> > +MODULE_LICENSE("GPL v2");
> >