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mtd: nand: fix GET/SET_FEATURES address on 16-bit devices

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As per following Sections in ONFI Spec, GET_FEATURES and SET_FEATURES also need
byte-addressing on 16-bit devices.

*Section: Target Initialization"
"The Read ID and Read Parameter Page commands only use the lower 8-bits of the
 data bus. The host shall not issue commands that use a word data width on x16
 devices until the host determines the device supports a 16-bit data bus width
 in the parameter page."

*Section: Bus Width Requirements*
"When the host supports a 16-bit bus width, only data is transferred at the
 16-bit width. All address and command line transfers shall use only the lower
 8-bits of the data bus. During command transfers, the host may place any value
 on the upper 8-bits of the data bus. During address transfers, the host shall
 set the upper 8-bits of the data bus to 00h."

So porting following commit from linux kernel
    commit e34fcb07a6d57411de6e15a47724fbe92c5caa42
    Author: David Mosberger <davidm@egauge.net>  (preserving authorship)
    mtd: nand: fix GET/SET_FEATURES address on 16-bit devices

Signed-off-by: Pekon Gupta <pekon@ti.com>
This commit is contained in:
David Mosberger 2014-05-06 00:46:18 +05:30 • committed by Tom Rini
parent 27ce9e4290
commit 6e1899e633
1 changed files with 10 additions and 1 deletions
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11
include/linux/mtd/nand.h
View file

@ -725,7 +725,16 @@ static inline int onfi_get_sync_timing_mode(struct nand_chip *chip)
*/
static inline int nand_opcode_8bits(unsigned int command)
{
return command == NAND_CMD_READID;
switch (command) {
case NAND_CMD_READID:
case NAND_CMD_PARAM:
case NAND_CMD_GET_FEATURES:
case NAND_CMD_SET_FEATURES:
return 1;
default:
break;
}
return 0;
}