Re: [PATCH V21 09/22] mmc: sdhci: add UHS-II module and add a kernel configuration

[Victor Shih]

On Mon, Sep 9, 2024 at 4:06 PM Adrian Hunter <adrian.hunter@xxxxxxxxx> wrote:
>
> On 6/09/24 13:20, Victor Shih wrote:
> > From: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
> >
> > This patch adds sdhci-uhs2.c as a module for UHS-II support.
> > This is a skeleton for further development in this patch series.
> >
> > This kernel configuration, CONFIG_MMC_SDHCI_UHS2, will be used
> > in the following commits to indicate UHS-II specific code in sdhci
> > controllers.
> >
> > Signed-off-by: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
> > Signed-off-by: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
> > Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
>
> Doesn't compile:
>
> drivers/mmc/host/sdhci-uhs2.c:28:12: error: ‘sdhci_uhs2_host_ops_init’ defined but not used [-Werror=unused-function]
>    28 | static int sdhci_uhs2_host_ops_init(struct sdhci_host *host)
>       |            ^~~~~~~~~~~~~~~~~~~~~~~~
> cc1: all warnings being treated as errors
> make[5]: *** [scripts/Makefile.build:244: drivers/mmc/host/sdhci-uhs2.o] Error 1
> make[4]: *** [scripts/Makefile.build:485: drivers/mmc/host] Error 2
> make[3]: *** [scripts/Makefile.build:485: drivers/mmc] Error 2
> make[3]: *** Waiting for unfinished jobs....
> make[2]: *** [scripts/Makefile.build:485: drivers] Error 2
> make[1]: *** [/home/ahunter/git/review/Makefile:1925: .] Error 2
> make: *** [Makefile:224: __sub-make] Error 2
>

Hi, Adrian

I will correct this issue in the next version.

Thanks, Victor Shih

> > ---
> >
> > Updates in V9:
> >  - Modify the commit message.
> >
> > Updates in V8:
> >  - Modify MODULE_LICENSE from "GPL v2" to "GPL".
> >
> > Updates in V6:
> >  - Merage V5 of patch[7] and patch[9] in to V6 of patch[8].
> >
> > ---
> >
> >  drivers/mmc/host/Kconfig      |  9 +++++++
> >  drivers/mmc/host/Makefile     |  1 +
> >  drivers/mmc/host/sdhci-uhs2.c | 46 +++++++++++++++++++++++++++++++++++
> >  3 files changed, 56 insertions(+)
> >  create mode 100644 drivers/mmc/host/sdhci-uhs2.c
> >
> > diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> > index 7199cb0bd0b9..f636af8a98df 100644
> > --- a/drivers/mmc/host/Kconfig
> > +++ b/drivers/mmc/host/Kconfig
> > @@ -98,6 +98,15 @@ config MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER
> >
> >         This is the case for the Nintendo Wii SDHCI.
> >
> > +config MMC_SDHCI_UHS2
> > +     tristate "UHS2 support on SDHCI controller"
> > +     depends on MMC_SDHCI
> > +     help
> > +       This option is selected by SDHCI controller drivers that want to
> > +       support UHS2-capable devices.
> > +
> > +       If you have a controller with this feature, say Y or M here.
> > +
> >  config MMC_SDHCI_PCI
> >       tristate "SDHCI support on PCI bus"
> >       depends on MMC_SDHCI && PCI
> > diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> > index 3ccffebbe59b..5147467ec825 100644
> > --- a/drivers/mmc/host/Makefile
> > +++ b/drivers/mmc/host/Makefile
> > @@ -11,6 +11,7 @@ obj-$(CONFIG_MMC_PXA)               += pxamci.o
> >  obj-$(CONFIG_MMC_MXC)                += mxcmmc.o
> >  obj-$(CONFIG_MMC_MXS)                += mxs-mmc.o
> >  obj-$(CONFIG_MMC_SDHCI)              += sdhci.o
> > +obj-$(CONFIG_MMC_SDHCI_UHS2) += sdhci-uhs2.o
> >  obj-$(CONFIG_MMC_SDHCI_PCI)  += sdhci-pci.o
> >  sdhci-pci-y                  += sdhci-pci-core.o sdhci-pci-o2micro.o sdhci-pci-arasan.o \
> >                                  sdhci-pci-dwc-mshc.o sdhci-pci-gli.o
> > diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> > new file mode 100644
> > index 000000000000..608f8ad5aaed
> > --- /dev/null
> > +++ b/drivers/mmc/host/sdhci-uhs2.c
> > @@ -0,0 +1,46 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/*
> > + *  linux/drivers/mmc/host/sdhci_uhs2.c - Secure Digital Host Controller
> > + *  Interface driver
> > + *
> > + *  Copyright (C) 2014 Intel Corp, All Rights Reserved.
> > + *  Copyright (C) 2020 Genesys Logic, Inc.
> > + *  Authors: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
> > + *  Copyright (C) 2020 Linaro Limited
> > + *  Author: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
> > + */
> > +
> > +#include <linux/module.h>
> > +
> > +#include "sdhci.h"
> > +#include "sdhci-uhs2.h"
> > +
> > +#define DRIVER_NAME "sdhci_uhs2"
> > +#define DBG(f, x...) \
> > +     pr_debug(DRIVER_NAME " [%s()]: " f, __func__, ## x)
> > +
> > +/*****************************************************************************\
> > + *                                                                           *
> > + * Driver init/exit                                                          *
> > + *                                                                           *
> > +\*****************************************************************************/
> > +
> > +static int sdhci_uhs2_host_ops_init(struct sdhci_host *host)
> > +{
> > +     return 0;
> > +}
> > +
> > +static int __init sdhci_uhs2_mod_init(void)
> > +{
> > +     return 0;
> > +}
> > +module_init(sdhci_uhs2_mod_init);
> > +
> > +static void __exit sdhci_uhs2_mod_exit(void)
> > +{
> > +}
> > +module_exit(sdhci_uhs2_mod_exit);
> > +
> > +MODULE_AUTHOR("Intel, Genesys Logic, Linaro");
> > +MODULE_DESCRIPTION("MMC UHS-II Support");
> > +MODULE_LICENSE("GPL");
>