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Some sdio card are not following sdio standard, and do not work when the sdio bus's clock is gated. To keep functionnality for all legacy driver, we turn this quirk on for every sdio card. Drivers needs to disable the quirk manually when someone verifies that their supported card works with clock gating. Signed-off-by: Pierre Tardy <tardyp@gmail.com> Acked-by: Ohad Ben-Cohen <ohad@wizery.com> Signed-off-by: Chris Ball <cjb@laptop.org>
75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
/*
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* This file contains work-arounds for many known sdio hardware
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* bugs.
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*
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* Copyright (c) 2011 Pierre Tardy <tardyp@gmail.com>
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* Inspired from pci fixup code:
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* Copyright (c) 1999 Martin Mares <mj@ucw.cz>
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*
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/mmc/card.h>
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#include <linux/mod_devicetable.h>
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/*
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* The world is not perfect and supplies us with broken mmc/sdio devices.
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* For at least a part of these bugs we need a work-around
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*/
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struct mmc_fixup {
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u16 vendor, device; /* You can use SDIO_ANY_ID here of course */
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void (*vendor_fixup)(struct mmc_card *card, int data);
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int data;
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};
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/*
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* This hook just adds a quirk unconditionnally
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*/
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static void __maybe_unused add_quirk(struct mmc_card *card, int data)
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{
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card->quirks |= data;
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}
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/*
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* This hook just removes a quirk unconditionnally
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*/
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static void __maybe_unused remove_quirk(struct mmc_card *card, int data)
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{
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card->quirks &= ~data;
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}
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/*
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* This hook just adds a quirk for all sdio devices
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*/
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static void add_quirk_for_sdio_devices(struct mmc_card *card, int data)
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{
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if (mmc_card_sdio(card))
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card->quirks |= data;
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}
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static const struct mmc_fixup mmc_fixup_methods[] = {
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/* by default sdio devices are considered CLK_GATING broken */
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/* good cards will be whitelisted as they are tested */
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{ SDIO_ANY_ID, SDIO_ANY_ID,
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add_quirk_for_sdio_devices, MMC_QUIRK_BROKEN_CLK_GATING }
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{ 0 }
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};
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void mmc_fixup_device(struct mmc_card *card)
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{
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const struct mmc_fixup *f;
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for (f = mmc_fixup_methods; f->vendor_fixup; f++) {
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if ((f->vendor == card->cis.vendor
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|| f->vendor == (u16) SDIO_ANY_ID) &&
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(f->device == card->cis.device
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|| f->device == (u16) SDIO_ANY_ID)) {
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dev_dbg(&card->dev, "calling %pF\n", f->vendor_fixup);
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f->vendor_fixup(card, f->data);
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}
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}
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}
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EXPORT_SYMBOL(mmc_fixup_device);
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