linux-kernel - [PATCH] mtd: nand: brcmnand: fix NAND timeout when accessing eMMC

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Message-ID: <20250522172526.3926633-1-dregan@broadcom.com>
Date: Thu, 22 May 2025 10:25:17 -0700
From: dregan@...adcom.com
To: linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org,
	bcm-kernel-feedback-list@...adcom.com,
	william.zhang@...adcom.com,
	anand.gore@...adcom.com,
	florian.fainelli@...adcom.com,
	kamal.dasu@...adcom.com,
	dan.beygelman@...adcom.com,
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Subject: [PATCH] mtd: nand: brcmnand: fix NAND timeout when accessing eMMC

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

When booting a board to NAND and accessing NAND while eMMC
transactions are occurring the NAND will sometimes timeout. This
is due to both NAND and eMMC controller sharing the same data bus
on BCMBCA chips. Fix is to extend NAND timeout to allow eMMC
transactions time to complete.

Signed-off-by: David Regan <dregan@...adcom.com>
Reviewed-by: William Zhang <william.zhang@...adcom.com>
Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
---
 drivers/mtd/nand/raw/brcmnand/brcmnand.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
index 17f6d9723df9..1e9d56a315da 100644
--- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
@@ -101,7 +101,7 @@ struct brcm_nand_dma_desc {
 #define BRCMNAND_MIN_DEVSIZE	(4ULL * 1024 * 1024)
 
 #define NAND_CTRL_RDY			(INTFC_CTLR_READY | INTFC_FLASH_READY)
-#define NAND_POLL_STATUS_TIMEOUT_MS	100
+#define NAND_POLL_STATUS_TIMEOUT_MS	500
 
 #define EDU_CMD_WRITE          0x00
 #define EDU_CMD_READ           0x01
-- 
2.43.5