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Date: Mon, 10 Jan 2011 08:04:57 -0800
From: Philip Rakity <prakity@...vell.com>
To: Pierre Tardy <tardyp@...il.com>
CC: "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Pierre Tardy <pierre.tardy@...el.com>
Subject: Re: [PATCH 1/3] mmc: add per device quirk placeholder
On Jan 9, 2011, at 8:26 AM, Pierre Tardy wrote:
> From: Pierre Tardy <pierre.tardy@...el.com>
>
> Some cards have quirks valid for every platforms
> using current platform quirk hooks leads to a lot
> of code and debug duplication.
>
> So we inspire a bit from what exists in PCI subsystem
> and do our own per vendorid/deviceid quirk
> We still drop the complexity of the pci quirk system
> (with special section tables, and so on)
> That can be added later if needed.
>
> Signed-off-by: Pierre Tardy <pierre.tardy@...el.com>
> ---
> drivers/mmc/core/Makefile | 3 +-
> drivers/mmc/core/core.h | 2 +
> drivers/mmc/core/quirks.c | 54 +++++++++++++++++++++++++++++++++++++++++++++
> drivers/mmc/core/sdio.c | 1 +
> include/linux/mmc/card.h | 2 +
> 5 files changed, 61 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile
> index 86b4791..6395019 100644
> --- a/drivers/mmc/core/Makefile
> +++ b/drivers/mmc/core/Makefile
> @@ -6,6 +6,7 @@ obj-$(CONFIG_MMC) += mmc_core.o
> mmc_core-y := core.o bus.o host.o \
> mmc.o mmc_ops.o sd.o sd_ops.o \
> sdio.o sdio_ops.o sdio_bus.o \
> - sdio_cis.o sdio_io.o sdio_irq.o
> + sdio_cis.o sdio_io.o sdio_irq.o \
> + quirks.o
>
> mmc_core-$(CONFIG_DEBUG_FS) += debugfs.o
> diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
> index ca1fdde..20b1c08 100644
> --- a/drivers/mmc/core/core.h
> +++ b/drivers/mmc/core/core.h
> @@ -61,6 +61,8 @@ int mmc_attach_mmc(struct mmc_host *host);
> int mmc_attach_sd(struct mmc_host *host);
> int mmc_attach_sdio(struct mmc_host *host);
>
> +void mmc_fixup_device(struct mmc_card *card);
> +
> /* Module parameters */
> extern int use_spi_crc;
>
> diff --git a/drivers/mmc/core/quirks.c b/drivers/mmc/core/quirks.c
> new file mode 100644
> index 0000000..d8a5fec
> --- /dev/null
> +++ b/drivers/mmc/core/quirks.c
> @@ -0,0 +1,54 @@
> +/*
> + * This file contains work-arounds for many known sdio hardware
> + * bugs.
> + *
> + * Copyright (c) 2011 Pierre Tardy <tardyp@...il.com>
> + * Inspired from pci fixup code:
> + * Copyright (c) 1999 Martin Mares <mj@....cz>
> + *
> + */
> +
> +#include <linux/types.h>
> +#include <linux/kernel.h>
> +#include <linux/mmc/card.h>
> +#include <linux/mod_devicetable.h>
> +
> +/*
> + * The world is not perfect and supplies us with broken mmc/sdio devices.
> + * For at least a part of these bugs we need a work-around
> + */
> +
> +struct mmc_fixup {
> + u16 vendor, device; /* You can use SDIO_ANY_ID here of course */
> + void (*hook)(struct mmc_card *card, int data);
> + int data;
> +};
> +
> +/*
> + * This hook just adds a quirk unconditionnally
> + */
> +static void add_quirk(struct mmc_card *card, int data)
> +{
> + card->quirks |= data;
> +}
> +
> +static const struct mmc_fixup mmc_fixup_methods[] = {
> + { 0 }
> +};
> +
> +void (struct mmc_card *card)
> +{
> + const struct mmc_fixup *f;
> +
> + for (f = mmc_fixup_methods; f->hook; f++) {
> + if ((f->vendor == card->cis.vendor
> + || f->vendor == (u16) SDIO_ANY_ID) &&
> + (f->device == card->cis.device
> + || f->device == (u16) SDIO_ANY_ID)) {
> + dev_dbg(&card->dev, "calling %pF\n", f->hook);
> + f->hook(card, f->data);
hook is not a very nice name --- something more meaningful: vendor_fixup ?
> + }
> + }
> +}
> +EXPORT_SYMBOL(mmc_fixup_device);
> +
> diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
> index 5c4a54d..617e9ad 100644
> --- a/drivers/mmc/core/sdio.c
> +++ b/drivers/mmc/core/sdio.c
> @@ -458,6 +458,7 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
>
> card = oldcard;
> }
> + mmc_fixup_device(card);
>
> if (card->type == MMC_TYPE_SD_COMBO) {
> err = mmc_sd_setup_card(host, card, oldcard != NULL);
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index 8ce0827..a498d53 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -148,6 +148,8 @@ struct mmc_card {
> struct dentry *debugfs_root;
> };
>
> +void mmc_fixup_device(struct mmc_card *dev);
> +
> #define mmc_card_mmc(c) ((c)->type == MMC_TYPE_MMC)
> #define mmc_card_sd(c) ((c)->type == MMC_TYPE_SD)
> #define mmc_card_sdio(c) ((c)->type == MMC_TYPE_SDIO)
> --
> 1.7.1
>
> --
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