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Commit 8ae61ebd authored by Chuanxiao Dong's avatar Chuanxiao Dong Committed by David Woodhouse
Browse files

nand/denali: Fixed handle ECC error bugs 



Once the last ECC error was handled, controller will triger an
interrupt. If this interrupt can not be clean on time, controller
may corrupt.

Signed-off-by: default avatarChuanxiao Dong <chuanxiao.dong@intel.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent 24c3fa36

drivers/mtd/nand/denali.c

+29 −16
Original line number Diff line number Diff line
@@ -643,6 +643,7 @@ static void clear_interrupts(struct denali_nand_info *denali) 
	spin_lock_irq(&denali->irq_lock);



	status = read_interrupt_status(denali);

	clear_interrupt(denali, status);



#if DEBUG_DENALI

	denali->irq_debug_array[denali->idx++] = 0x30000000 | status;
@@ -1015,12 +1016,12 @@ bool is_erased(uint8_t *buf, int len) 
#define ECC_SECTOR(x)	(((x) & ECC_ERROR_ADDRESS__SECTOR_NR) >> 12)

#define ECC_BYTE(x)	(((x) & ECC_ERROR_ADDRESS__OFFSET))

#define ECC_CORRECTION_VALUE(x) ((x) & ERR_CORRECTION_INFO__BYTEMASK)

#define ECC_ERROR_CORRECTABLE(x) (!((x) & ERR_CORRECTION_INFO))

#define ECC_ERR_DEVICE(x)	((x) & ERR_CORRECTION_INFO__DEVICE_NR >> 8)

#define ECC_ERROR_CORRECTABLE(x) (!((x) & ERR_CORRECTION_INFO__ERROR_TYPE))

#define ECC_ERR_DEVICE(x)	(((x) & ERR_CORRECTION_INFO__DEVICE_NR) >> 8)

#define ECC_LAST_ERR(x)		((x) & ERR_CORRECTION_INFO__LAST_ERR_INFO)



static bool handle_ecc(struct denali_nand_info *denali, uint8_t *buf,

			uint8_t *oobbuf, uint32_t irq_status)

					uint32_t irq_status)

{

	bool check_erased_page = false;
@@ -1029,6 +1030,7 @@ static bool handle_ecc(struct denali_nand_info *denali, uint8_t *buf, 
		uint32_t err_address = 0, err_correction_info = 0;

		uint32_t err_byte = 0, err_sector = 0, err_device = 0;

		uint32_t err_correction_value = 0;

		denali_set_intr_modes(denali, false);



		do {

			err_address = ioread32(denali->flash_reg +
@@ -1036,7 +1038,6 @@ static bool handle_ecc(struct denali_nand_info *denali, uint8_t *buf, 
			err_sector = ECC_SECTOR(err_address);

			err_byte = ECC_BYTE(err_address);





			err_correction_info = ioread32(denali->flash_reg +

						ERR_CORRECTION_INFO);

			err_correction_value =
@@ -1044,20 +1045,23 @@ static bool handle_ecc(struct denali_nand_info *denali, uint8_t *buf, 
			err_device = ECC_ERR_DEVICE(err_correction_info);



			if (ECC_ERROR_CORRECTABLE(err_correction_info)) {

				/* offset in our buffer is computed as:

				   sector number * sector size + offset in

				   sector

				 */

				int offset = err_sector * ECC_SECTOR_SIZE +

								err_byte;

				if (offset < denali->mtd.writesize) {

				/* If err_byte is larger than ECC_SECTOR_SIZE,

				 * means error happend in OOB, so we ignore

				 * it. It's no need for us to correct it

				 * err_device is represented the NAND error

				 * bits are happened in if there are more

				 * than one NAND connected.

				 * */

				if (err_byte < ECC_SECTOR_SIZE) {

					int offset;

					offset = (err_sector *

							ECC_SECTOR_SIZE +

							err_byte) *

							denali->devnum +

							err_device;

					/* correct the ECC error */

					buf[offset] ^= err_correction_value;

					denali->mtd.ecc_stats.corrected++;

				} else {

					/* bummer, couldn't correct the error */

					printk(KERN_ERR "ECC offset invalid\n");

					denali->mtd.ecc_stats.failed++;

				}

			} else {

				/* if the error is not correctable, need to
@@ -1074,6 +1078,15 @@ static bool handle_ecc(struct denali_nand_info *denali, uint8_t *buf, 
					err_correction_info);

#endif

		} while (!ECC_LAST_ERR(err_correction_info));

		/* Once handle all ecc errors, controller will triger

		 * a ECC_TRANSACTION_DONE interrupt, so here just wait

		 * for a while for this interrupt

		 * */

		while (!(read_interrupt_status(denali) &

				INTR_STATUS0__ECC_TRANSACTION_DONE))

			cpu_relax();

		clear_interrupts(denali);

		denali_set_intr_modes(denali, true);

	}

	return check_erased_page;

}
@@ -1237,7 +1250,7 @@ static int denali_read_page(struct mtd_info *mtd, struct nand_chip *chip, 


	memcpy(buf, denali->buf.buf, mtd->writesize);



	check_erased_page = handle_ecc(denali, buf, chip->oob_poi, irq_status);

	check_erased_page = handle_ecc(denali, buf, irq_status);

	denali_enable_dma(denali, false);



	if (check_erased_page) {