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sdhci: describe quirks 

Add a comment for each quirk to describe what it does and why.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Pierre Ossman 2007-12-02 19:45:19 +01:00
parent 75b8c13326
commit dc93441b3f
1 changed files with 10 additions and 0 deletions
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10
drivers/mmc/host/sdhci.c
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@ -26,12 +26,22 @@
static unsigned int debug_quirks = 0; static unsigned int debug_quirks = 0;
/*
* Different quirks to handle when the hardware deviates from a strict
* interpretation of the SDHCI specification.
*/
/* Controller doesn't honor resets unless we touch the clock register */
#define SDHCI_QUIRK_CLOCK_BEFORE_RESET (1<<0) #define SDHCI_QUIRK_CLOCK_BEFORE_RESET (1<<0)
/* Controller has bad caps bits, but really supports DMA */
#define SDHCI_QUIRK_FORCE_DMA (1<<1) #define SDHCI_QUIRK_FORCE_DMA (1<<1)
/* Controller doesn't like some resets when there is no card inserted. */ /* Controller doesn't like some resets when there is no card inserted. */
#define SDHCI_QUIRK_NO_CARD_NO_RESET (1<<2) #define SDHCI_QUIRK_NO_CARD_NO_RESET (1<<2)
/* Controller doesn't like clearing the power reg before a change */
#define SDHCI_QUIRK_SINGLE_POWER_WRITE (1<<3) #define SDHCI_QUIRK_SINGLE_POWER_WRITE (1<<3)
/* Controller has flaky internal state so reset it on each ios change */
#define SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS (1<<4) #define SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS (1<<4)
/* Controller has an unusable DMA engine */
#define SDHCI_QUIRK_BROKEN_DMA (1<<5) #define SDHCI_QUIRK_BROKEN_DMA (1<<5)
static const struct pci_device_id pci_ids[] __devinitdata = { static const struct pci_device_id pci_ids[] __devinitdata = {