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mtd: rawnand: Support enabling NV-DDR through SET_FEATURES 

Until now the parameter of the ADDR_TIMING_MODE feature was just the
ONFI timing mode (from 0 to 5) because we were only supporting the SDR
data interface. In the same byte, bits 4 and 5 indicate which data
interface is being configured so use them to set the right mode and also
read them back to ensure the right timing has been setup on the chip's
side.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210505213750.257417-17-miquel.raynal@bootlin.com
This commit is contained in:
Miquel Raynal 2021-05-05 23:37:44 +02:00
Родитель e32df79f19
Коммит f3fe156ede
2 изменённых файлов: 18 добавлений и 5 удалений
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18
drivers/mtd/nand/raw/nand_base.c
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@ -832,7 +832,7 @@ static int nand_reset_interface(struct nand_chip *chip, int chipnr)
static int nand_setup_interface(struct nand_chip *chip, int chipnr)
{
const struct nand_controller_ops *ops = chip->controller->ops;
u8 tmode_param[ONFI_SUBFEATURE_PARAM_LEN] = { };
u8 tmode_param[ONFI_SUBFEATURE_PARAM_LEN] = { }, request;
int ret;
if (!nand_controller_can_setup_interface(chip))
@ -848,7 +848,12 @@ static int nand_setup_interface(struct nand_chip *chip, int chipnr)
if (!chip->best_interface_config)
return 0;
tmode_param[0] = chip->best_interface_config->timings.mode;
request = chip->best_interface_config->timings.mode;
if (nand_interface_is_sdr(chip->best_interface_config))
request |= ONFI_DATA_INTERFACE_SDR;
else
request |= ONFI_DATA_INTERFACE_NVDDR;
tmode_param[0] = request;
/* Change the mode on the chip side (if supported by the NAND chip) */
if (nand_supports_set_features(chip, ONFI_FEATURE_ADDR_TIMING_MODE)) {
@ -877,10 +882,13 @@ static int nand_setup_interface(struct nand_chip *chip, int chipnr)
if (ret)
goto err_reset_chip;
if (tmode_param[0] != chip->best_interface_config->timings.mode) {
pr_warn("timing mode %d not acknowledged by the NAND chip\n",
if (request != tmode_param[0]) {
pr_warn("%s timing mode %d not acknowledged by the NAND chip\n",
nand_interface_is_nvddr(chip->best_interface_config) ? "NV-DDR" : "SDR",
chip->best_interface_config->timings.mode);
ret = 0;
pr_debug("NAND chip would work in %s timing mode %d\n",
tmode_param[0] & ONFI_DATA_INTERFACE_NVDDR ? "NV-DDR" : "SDR",
(unsigned int)ONFI_TIMING_MODE_PARAM(tmode_param[0]));
goto err_reset_chip;
}

5
include/linux/mtd/onfi.h
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@ -11,6 +11,7 @@
#define __LINUX_MTD_ONFI_H
#include <linux/types.h>
#include <linux/bitfield.h>
/* ONFI version bits */
#define ONFI_VERSION_1_0 BIT(1)
@ -29,6 +30,9 @@
#define ONFI_FEATURE_EXT_PARAM_PAGE BIT(7)
/* ONFI timing mode, used in both asynchronous and synchronous mode */
#define ONFI_DATA_INTERFACE_SDR 0
#define ONFI_DATA_INTERFACE_NVDDR BIT(4)
#define ONFI_DATA_INTERFACE_NVDDR2 BIT(5)
#define ONFI_TIMING_MODE_0 BIT(0)
#define ONFI_TIMING_MODE_1 BIT(1)
#define ONFI_TIMING_MODE_2 BIT(2)
@ -36,6 +40,7 @@
#define ONFI_TIMING_MODE_4 BIT(4)
#define ONFI_TIMING_MODE_5 BIT(5)
#define ONFI_TIMING_MODE_UNKNOWN BIT(6)
#define ONFI_TIMING_MODE_PARAM(x) FIELD_GET(GENMASK(3, 0), (x))
/* ONFI feature number/address */
#define ONFI_FEATURE_NUMBER 256