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 <musashino.open@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/18543
Signed-off-by: Robert Marko <robimarko@gmail.com>

diff --git a/target/linux/qualcommax/patches-6.6/0413-spi-spi-qpic-snand-add-user-config-support.patch b/target/linux/qualcommax/patches-6.6/0413-spi-spi-qpic-snand-add-user-config-support.patch
new file mode 100644 (file)
index 0000000..37c6fdc
--- /dev/null
+++ b/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 <musashino.open@gmail.com>
+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 <musashino.open@gmail.com>
+---
+--- 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;