qualcommax: allow overriding ECC strength for qpic-snand

Make the ECC strength in the qpic-snand driver configurable via device
tree to use the device-specific ECC strength value.

Signed-off-by: INAGAKI Hiroshi <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/18543
Signed-off-by: Robert Marko <[email protected]>

target/linux/qualcommax/patches-6.6/0413-spi-spi-qpic-snand-add-user-config-support.patch

@@ -0,0 +1,35 @@
+From 589b7e9600b1e50574ce91e4d6fc903ef81d957f Mon Sep 17 00:00:00 2001
+From: INAGAKI Hiroshi <[email protected]>
+Date: Fri, 14 Feb 2025 18:19:58 +0900
+Subject: [PATCH] spi: spi-qpic-snand: add user_config support for ECC
+
+Make the ECC strength in the qpic-snand driver configurable via device
+tree to use the device-specific ECC strength value.
+
+Signed-off-by: INAGAKI Hiroshi <[email protected]>
+---
+--- a/drivers/spi/spi-qpic-snand.c
++++ b/drivers/spi/spi-qpic-snand.c
+@@ -274,8 +274,20 @@ static int qcom_spi_ecc_init_ctx_pipelin
+ 	nand->ecc.ctx.priv = ecc_cfg;
+ 	snandc->qspi->mtd = mtd;
+ 
+-	/* BCH8 or BCH4 */
+-	ecc_mode = mtd->oobsize > 64 ? 1 : 0;
++	/* BCH4 or BCH8 */
++	switch (nand->ecc.user_conf.strength) {
++	case 4:
++		ecc_mode = 0;
++		break;
++	case 8:
++		ecc_mode = 1;
++		break;
++	default:
++		ecc_mode = mtd->oobsize > 64 ? 1 : 0;
++		dev_warn(snandc->dev,
++			 "invalid ECC strength detected, configured from mtd oobsize\n");
++		break;
++	}
+ 
+ 	ecc_cfg->ecc_bytes_hw = ecc_mode ? 13 : 7;
+ 	ecc_cfg->spare_bytes = ecc_mode ? 2 : 4;