mtd: spi-nor: aspeed: set the decoding size to at least 2MB for AST2600

In AST2600, the unit of SPI CEx decoding range register is 1MB, and end address offset is set to the acctual offset - 1MB. If the flash only has 1MB, the end address will has same value as start address, which will causing unexpected errors. This patch set the decoding size to at least 2MB to avoid decoding errors. Tested: root@bletchley:~# dmesg | grep "aspeed-smc 1e631000.spi: CE0 window" [ 59.328134] aspeed-smc 1e631000.spi: CE0 window resized to 2MB (AST2600 Decoding) [ 59.343001] aspeed-smc 1e631000.spi: CE0 window [ 0x50000000 - 0x50200000 ] 2MB root@bletchley:~# devmem 0x1e631030 0x00100000 Signed-off-by: Potin Lai <potin.lai@quantatw.com> [ clg : Ported on new spi-mem driver ] Signed-off-by: Cédric Le Goater <clg@kaod.org>
legoater · Mar 7, 2022 · 4181267 · 4181267
1 parent 094b729
commit 4181267
Showing 1 changed file with 11 additions and 0 deletions.
diff --git a/drivers/spi/spi-aspeed-smc.c b/drivers/spi/spi-aspeed-smc.c
@@ -489,6 +489,17 @@ static int aspeed_spi_chip_adjust_window(struct aspeed_spi_chip *chip,
 			 chip->cs, size >> 20);
 	}
 
+	/*
+	 * The decoding size of AST2600 SPI controller should set at
+	 * least 2MB.
+	 */
+	if ((aspi->data == &ast2600_spi_data || aspi->data == &ast2600_fmc_data) &&
+	    size < SZ_2M) {
+		size = SZ_2M;
+		dev_info(aspi->dev, "CE%d window resized to %dMB (AST2600 Decoding)",
+			 chip->cs, size >> 20);
+	}
+
 	aspeed_spi_get_windows(aspi, windows);
 
 	/* Adjust this chip window */