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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
[PATCH] MMC: Proper MMC command classes support
Defines for the different command classes as defined in the MMC and SD
specifications.
Removes the check for high command classes and instead checks that the
command classes needed are present.
Previous solution killed forward compatibility at no apparent gain.
Signed-of-by: Pierre Ossman
authored by Pierre Ossman and committed by Russell King 912490db 9636273d
+4
-1
drivers/mmc/mmc_block.c
+4
-1
drivers/mmc/mmc_block.c
···
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struct mmc_blk_data *md;
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int err;
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-
if (card->csd.cmdclass & ~0x1ff)
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+
/*
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* Check that the card supports the command class(es) we need.
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*/
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if (!(card->csd.cmdclass & CCC_BLOCK_READ))
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return -ENODEV;
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if (card->csd.read_blkbits < 9) {
+27
include/linux/mmc/protocol.h
+27
include/linux/mmc/protocol.h
···
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#define MMC_VDD_35_36 0x00800000 /* VDD voltage 3.5 ~ 3.6 */
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#define MMC_CARD_BUSY 0x80000000 /* Card Power up status bit */
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/*
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* Card Command Classes (CCC)
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*/
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#define CCC_BASIC (1<<0) /* (0) Basic protocol functions */
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/* (CMD0,1,2,3,4,7,9,10,12,13,15) */
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#define CCC_STREAM_READ (1<<1) /* (1) Stream read commands */
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/* (CMD11) */
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#define CCC_BLOCK_READ (1<<2) /* (2) Block read commands */
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/* (CMD16,17,18) */
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#define CCC_STREAM_WRITE (1<<3) /* (3) Stream write commands */
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/* (CMD20) */
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#define CCC_BLOCK_WRITE (1<<4) /* (4) Block write commands */
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/* (CMD16,24,25,26,27) */
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#define CCC_ERASE (1<<5) /* (5) Ability to erase blocks */
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/* (CMD32,33,34,35,36,37,38,39) */
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#define CCC_WRITE_PROT (1<<6) /* (6) Able to write protect blocks */
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/* (CMD28,29,30) */
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#define CCC_LOCK_CARD (1<<7) /* (7) Able to lock down card */
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/* (CMD16,CMD42) */
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#define CCC_APP_SPEC (1<<8) /* (8) Application specific */
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/* (CMD55,56,57,ACMD*) */
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#define CCC_IO_MODE (1<<9) /* (9) I/O mode */
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/* (CMD5,39,40,52,53) */
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#define CCC_SWITCH (1<<10) /* (10) High speed switch */
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/* (CMD6,34,35,36,37,50) */
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/* (11) Reserved */
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/* (CMD?) */
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/*
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* CSD field definitions