[MTD] NAND: Add ECC debugging for CAFÉ (7608194c) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/mtd/nand/cafe_ecc.c

+36 −3

Original line number	Diff line number	Diff line
		@@ -19,6 +19,7 @@
		*/

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/errno.h>

		static unsigned short gf4096_mul(unsigned short, unsigned short);
		@@ -1322,16 +1323,43 @@ void correct_12bit_symbol(unsigned char *buf, unsigned short sym,
		buf[2+(3*(sym-2))/2] ^= (val >> 8);
		buf[3+(3*(sym-2))/2] ^= (val & 0xff);
		}


		}

		static int debugecc = 0;
		module_param(debugecc, int, 0644);

		int cafe_correct_ecc(unsigned char *buf,
		unsigned short *chk_syndrome_list)
		{
		unsigned short err_info[9];
		int i;

		if (debugecc) {
		printk(KERN_WARNING "cafe_correct_ecc invoked. Syndromes %x %x %x %x %x %x %x %x\n",
		chk_syndrome_list[0], chk_syndrome_list[1],
		chk_syndrome_list[2], chk_syndrome_list[3],
		chk_syndrome_list[4], chk_syndrome_list[5],
		chk_syndrome_list[6], chk_syndrome_list[7]);
		for (i=0; i < 2048; i+=16) {
		printk(KERN_WARNING "D %04x: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
		i,
		buf[i], buf[i+1], buf[i+2], buf[i+3],
		buf[i+4], buf[i+5], buf[i+6], buf[i+7],
		buf[i+8], buf[i+9], buf[i+10], buf[i+11],
		buf[i+12], buf[i+13], buf[i+14], buf[i+15]);
		}
		for ( ; i < 2112; i+=16) {
		printk(KERN_WARNING "O %02x: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
		i - 2048,
		buf[i], buf[i+1], buf[i+2], buf[i+3],
		buf[i+4], buf[i+5], buf[i+6], buf[i+7],
		buf[i+8], buf[i+9], buf[i+10], buf[i+11],
		buf[i+12], buf[i+13], buf[i+14], buf[i+15]);
		}
		}



		if (chk_no_err_only(chk_syndrome_list, err_info) &&
		chk_1_err_only(chk_syndrome_list, err_info) &&
		chk_2_err_only(chk_syndrome_list, err_info) &&
		@@ -1340,8 +1368,13 @@ int cafe_correct_ecc(unsigned char *buf,
		return -EIO;
		}

		for (i=0; i < err_info[0]; i++)
		for (i=0; i < err_info[0]; i++) {
		if (debugecc)
		printk(KERN_WARNING "Correct symbol %d with 0x%03x\n",
		err_info[1+i], err_info[5+i]);

		correct_12bit_symbol(buf, err_info[1+i], err_info[5+i]);
		}

		return err_info[0];
		}