[PATCH 1/4] spi: airoha: fix dirmap_{read,write} operations

[Lorenzo Bianconi]

SPI_NFI_READ_FROM_CACHE_DONE bit must be written at the end of
dirmap_read operation even if it is already set.
In the same way, SPI_NFI_LOAD_TO_CACHE_DONE bit must be written at the
end of dirmap_write operation even if it is already set.
For this reason use regmap_write_bits() instead of regmap_set_bits().
This patch fixes mtd_pagetest kernel module test.

Fixes: a403997c1201 ("spi: airoha: add SPI-NAND Flash controller driver")
Tested-by: Christian Marangi <ansuelsmth at gmail.com>
Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
---
 drivers/spi/spi-airoha-snfi.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-airoha-snfi.c b/drivers/spi/spi-airoha-snfi.c
index 9d97ec98881c..be3e4ac42153 100644
--- a/drivers/spi/spi-airoha-snfi.c
+++ b/drivers/spi/spi-airoha-snfi.c
@@ -739,8 +739,13 @@ static ssize_t airoha_snand_dirmap_read(struct spi_mem_dirmap_desc *desc,
 	if (err)
 		return err;
 
-	err = regmap_set_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_SNF_STA_CTL1,
-			      SPI_NFI_READ_FROM_CACHE_DONE);
+	/*
+	 * SPI_NFI_READ_FROM_CACHE_DONE bit must be written at the end
+	 * of dirmap_read operation even if it is already set.
+	 */
+	err = regmap_write_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_SNF_STA_CTL1,
+				SPI_NFI_READ_FROM_CACHE_DONE,
+				SPI_NFI_READ_FROM_CACHE_DONE);
 	if (err)
 		return err;
 
@@ -870,8 +875,13 @@ static ssize_t airoha_snand_dirmap_write(struct spi_mem_dirmap_desc *desc,
 	if (err)
 		return err;
 
-	err = regmap_set_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_SNF_STA_CTL1,
-			      SPI_NFI_LOAD_TO_CACHE_DONE);
+	/*
+	 * SPI_NFI_LOAD_TO_CACHE_DONE bit must be written at the end
+	 * of dirmap_write operation even if it is already set.
+	 */
+	err = regmap_write_bits(as_ctrl->regmap_nfi, REG_SPI_NFI_SNF_STA_CTL1,
+				SPI_NFI_LOAD_TO_CACHE_DONE,
+				SPI_NFI_LOAD_TO_CACHE_DONE);
 	if (err)
 		return err;
 

-- 
2.46.0