linux-kernel - [PATCH v2 10/10] mtd: rawnand: brcmnand: allow for on-die ecc

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Message-Id: <20240118195356.133391-11-dregan@broadcom.com>
Date: Thu, 18 Jan 2024 11:53:56 -0800
From: dregan@...adcom.com
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Subject: [PATCH v2 10/10] mtd: rawnand: brcmnand: allow for on-die ecc

From: David Regan <dregan@...adcom.com>

Allow settings for on-die ecc such that if on-die ECC is selected
don't error out but require ECC strap setting of zero

Signed-off-by: David Regan <dregan@...adcom.com>
Reviewed-by: William Zhang <william.zhang@...adcom.com>
---
Changes in v2:
- Added to patch series
---
 drivers/mtd/nand/raw/brcmnand/brcmnand.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
index a4e311b6798c..42526f3250c9 100644
--- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
@@ -2727,9 +2727,11 @@ static int brcmnand_setup_dev(struct brcmnand_host *host)
 	cfg->blk_adr_bytes = get_blk_adr_bytes(mtd->size, mtd->writesize);
 
 	if (chip->ecc.engine_type != NAND_ECC_ENGINE_TYPE_ON_HOST) {
-		dev_err(ctrl->dev, "only HW ECC supported; selected: %d\n",
-			chip->ecc.engine_type);
-		return -EINVAL;
+		if (chip->ecc.strength) {
+			dev_err(ctrl->dev, "ERROR!!! HW ECC must be set to zero for non-hardware ECC; selected: %d\n",
+				chip->ecc.strength);
+			return -EINVAL;
+		}
 	}
 
 	if (chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN) {
@@ -2797,7 +2799,11 @@ static int brcmnand_setup_dev(struct brcmnand_host *host)
 	if (ret)
 		return ret;
 
-	brcmnand_set_ecc_enabled(host, 1);
+	if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_ON_DIE) {
+		dev_dbg(ctrl->dev, "Disable HW ECC for on-die ECC\n");
+		brcmnand_set_ecc_enabled(host, 0);
+	} else
+		brcmnand_set_ecc_enabled(host, 1);
 
 	brcmnand_print_cfg(host, msg, cfg);
 	dev_info(ctrl->dev, "detected %s\n", msg);
-- 
2.37.3