mtd: devices: elm: configure parallel channels based on ecc_steps

ELM hardware can process up to maximum of 8 hannels in parallel for
ECC error detection. Currently the number of channels getting configured for
processing is static determined by macro ERROR_VECTOR_MAX. However, the actual
number of channels that need to be processed is the ECC step number.
This patch just avoids configuring extra unused channels.

Signed-off-by: Pekon Gupta <pekon@ti.com>
Reviewed-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/mtd/devices/elm.c b/drivers/mtd/devices/elm.c
index 4fbfaf65fabd..26df41f20c1f 100644
--- a/drivers/mtd/devices/elm.c
+++ b/drivers/mtd/devices/elm.c
@@ -84,6 +84,7 @@ struct elm_info {
         struct list_head list;
         enum bch_ecc bch_type;
         struct elm_registers elm_regs;
+        int ecc_steps;
         int ecc_syndrome_size;
 };
 
@@ -128,6 +129,7 @@ int elm_config(struct device *dev, enum bch_ecc bch_type,
         reg_val = (bch_type & ECC_BCH_LEVEL_MASK) | (ELM_ECC_SIZE << 16);
         elm_write_reg(info, ELM_LOCATION_CONFIG, reg_val);
         info->bch_type          = bch_type;
+        info->ecc_steps         = ecc_steps;
         info->ecc_syndrome_size = ecc_syndrome_size;
 
         return 0;
@@ -170,7 +172,7 @@ static void elm_load_syndrome(struct elm_info *info,
         int i, offset;
         u32 val;
 
-        for (i = 0; i < ERROR_VECTOR_MAX; i++) {
+        for (i = 0; i < info->ecc_steps; i++) {
 
                 /* Check error reported */
                 if (err_vec[i].error_reported) {
@@ -238,7 +240,7 @@ static void elm_start_processing(struct elm_info *info,
          * Set syndrome vector valid, so that ELM module
          * will process it for vectors error is reported
          */
-        for (i = 0; i < ERROR_VECTOR_MAX; i++) {
+        for (i = 0; i < info->ecc_steps; i++) {
                 if (err_vec[i].error_reported) {
                         offset = ELM_SYNDROME_FRAGMENT_6 +
                                 SYNDROME_FRAGMENT_REG_SIZE * i;
@@ -267,7 +269,7 @@ static void elm_error_correction(struct elm_info *info,
         int offset;
         u32 reg_val;
 
-        for (i = 0; i < ERROR_VECTOR_MAX; i++) {
+        for (i = 0; i < info->ecc_steps; i++) {
 
                 /* Check error reported */
                 if (err_vec[i].error_reported) {