From 2231dfcbcffef50846a9c240651c62771d7e33b0 Mon Sep 17 00:00:00 2001
From: Sam Shih <sam.shih@mediatek.com>
Date: Fri, 2 Jun 2023 13:06:18 +0800
Subject: [PATCH] 
 [spi-and-storage][999-2362-spi-mtk-nor-fix-timeout-calculation-overflow.patch]

---
 drivers/spi/spi-mtk-nor.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
index c15a99105..4f72f08c0 100644
--- a/drivers/spi/spi-mtk-nor.c
+++ b/drivers/spi/spi-mtk-nor.c
@@ -89,7 +89,7 @@
 // Buffered page program can do one 128-byte transfer
 #define MTK_NOR_PP_SIZE			128
 
-#define CLK_TO_US(sp, clkcnt)		((clkcnt) * 1000000 / sp->spi_freq)
+#define CLK_TO_US(sp, clkcnt)		DIV_ROUND_UP(clkcnt, sp->spi_freq / 1000000)
 
 struct mtk_nor {
 	struct spi_controller *ctlr;
@@ -177,6 +177,10 @@ static int mtk_nor_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)
 	if ((op->addr.nbytes == 3) || (op->addr.nbytes == 4)) {
 		if ((op->data.dir == SPI_MEM_DATA_IN) &&
 		    mtk_nor_match_read(op)) {
+			// limit size to prevent timeout calculation overflow
+			if (op->data.nbytes > 0x400000)
+				op->data.nbytes = 0x400000;
+
 			if ((op->addr.val & MTK_NOR_DMA_ALIGN_MASK) ||
 			    (op->data.nbytes < MTK_NOR_DMA_ALIGN))
 				op->data.nbytes = 1;
-- 
2.34.1