Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
sdhci: describe quirks
Add a comment for each quirk to describe what it does and why.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
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drivers/mmc/host/sdhci.c
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drivers/mmc/host/sdhci.c
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static unsigned int debug_quirks = 0;
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#define SDHCI_QUIRK_CLOCK_BEFORE_RESET (1<<0)
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#define SDHCI_QUIRK_FORCE_DMA (1<<1)
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/* Controller doesn't like some resets when there is no card inserted. */
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#define SDHCI_QUIRK_NO_CARD_NO_RESET (1<<2)
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#define SDHCI_QUIRK_SINGLE_POWER_WRITE (1<<3)
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#define SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS (1<<4)
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#define SDHCI_QUIRK_BROKEN_DMA (1<<5)
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static const struct pci_device_id pci_ids[] __devinitdata = {
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static unsigned int debug_quirks = 0;
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/*
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* Different quirks to handle when the hardware deviates from a strict
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* interpretation of the SDHCI specification.
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*/
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/* Controller doesn't honor resets unless we touch the clock register */
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#define SDHCI_QUIRK_CLOCK_BEFORE_RESET (1<<0)
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/* Controller has bad caps bits, but really supports DMA */
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#define SDHCI_QUIRK_FORCE_DMA (1<<1)
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/* Controller doesn't like some resets when there is no card inserted. */
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#define SDHCI_QUIRK_NO_CARD_NO_RESET (1<<2)
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/* Controller doesn't like clearing the power reg before a change */
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#define SDHCI_QUIRK_SINGLE_POWER_WRITE (1<<3)
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/* Controller has flaky internal state so reset it on each ios change */
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#define SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS (1<<4)
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/* Controller has an unusable DMA engine */
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#define SDHCI_QUIRK_BROKEN_DMA (1<<5)
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static const struct pci_device_id pci_ids[] __devinitdata = {