mtd: nand: fix interpretation of NAND_CMD_NONE in nand_command[_lp]()
[ Upstream commit df467899da
]
Some drivers (like nand_hynix.c) call ->cmdfunc() with NAND_CMD_NONE
and a column address and expect the controller to only send address
cycles. Right now, the default ->cmdfunc() implementations provided by
the core do not filter out the command cycle in this case and forwards
the request to the controller driver through the ->cmd_ctrl() method.
The thing is, NAND controller drivers can get this wrong and send a
command cycle with a NAND_CMD_NONE opcode and since NAND_CMD_NONE is
-1, and the command field is usually casted to an u8, we end up sending
the 0xFF command which is actually a RESET operation.
Add conditions in nand_command[_lp]() functions to sending the initial
command cycle when command == NAND_CMD_NONE.
Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
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@ -710,7 +710,8 @@ static void nand_command(struct mtd_info *mtd, unsigned int command,
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chip->cmd_ctrl(mtd, readcmd, ctrl);
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ctrl &= ~NAND_CTRL_CHANGE;
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}
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chip->cmd_ctrl(mtd, command, ctrl);
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if (command != NAND_CMD_NONE)
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chip->cmd_ctrl(mtd, command, ctrl);
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/* Address cycle, when necessary */
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ctrl = NAND_CTRL_ALE | NAND_CTRL_CHANGE;
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@ -739,6 +740,7 @@ static void nand_command(struct mtd_info *mtd, unsigned int command,
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*/
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switch (command) {
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case NAND_CMD_NONE:
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case NAND_CMD_PAGEPROG:
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case NAND_CMD_ERASE1:
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case NAND_CMD_ERASE2:
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@ -832,7 +834,9 @@ static void nand_command_lp(struct mtd_info *mtd, unsigned int command,
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}
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/* Command latch cycle */
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chip->cmd_ctrl(mtd, command, NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE);
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if (command != NAND_CMD_NONE)
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chip->cmd_ctrl(mtd, command,
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NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE);
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if (column != -1 || page_addr != -1) {
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int ctrl = NAND_CTRL_CHANGE | NAND_NCE | NAND_ALE;
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@ -868,6 +872,7 @@ static void nand_command_lp(struct mtd_info *mtd, unsigned int command,
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*/
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switch (command) {
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case NAND_CMD_NONE:
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case NAND_CMD_CACHEDPROG:
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case NAND_CMD_PAGEPROG:
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case NAND_CMD_ERASE1:
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