openwrt/target/linux/bcm47xx/patches-5.15/107-v5.18-mtd-rawnand-brcmnand-BCMA-controller-uses-command-shift-of-0.patch

From: Florian Fainelli <f.fainelli@gmail.com>
Subject: [PATCH v3 8/9] mtd: rawnand: brcmnand: BCMA controller uses command shift of 0
Date: Fri, 07 Jan 2022 10:46:13 -0800
Content-Type: text/plain; charset="utf-8"

For some odd and unexplained reason the BCMA NAND controller, albeit
revision 3.4 uses a command shift of 0 instead of 24 as it should be,
quirk that.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/mtd/nand/raw/brcmnand/brcmnand.c | 6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
@@ -951,6 +951,12 @@ static void brcmnand_wr_corr_thresh(stru
 
 static inline int brcmnand_cmd_shift(struct brcmnand_controller *ctrl)
 {
+	/* Kludge for the BCMA-based NAND controller which does not actually
+	 * shift the command
+	 */
+	if (ctrl->nand_version == 0x0304 && brcmnand_non_mmio_ops(ctrl))
+		return 0;
+
 	if (ctrl->nand_version < 0x0602)
 		return 24;
 	return 0;