diff mbox series

[v2,6/8] spi: dw: Actually mask interrupts

Message ID 20220301103529.3060257-7-Niklas.Cassel@wdc.com
State Accepted
Commit bae4d9fbd97623ccb96ad634128d1aa98faa30f2
Delegated to: Andes
Headers show
Series canaan k210 SoC fixes | expand

Commit Message

Niklas Cassel March 1, 2022, 10:35 a.m. UTC 
From: Sean Anderson <seanga2@gmail.com>

The designware spi driver unconditionally uses polling.

The comment to spi_hw_init() also states that the function should disable
interrupts.

According to the DesignWare DW_apb_ssi Databook, value 0xff in IMR enables
all interrupts. Since we want to mask all interrupts write 0x0 instead.

On the canaan k210 board, pressing the reset button twice to reset the
board will run u-boot. If u-boot boots Linux without having SPI interrupts
masked, Linux will hang as soon as interrupts are enabled, because of an
interrupt storm.

Properly masking the SPI interrupts in u-boot allows us to successfully
boot Linux, even after resetting the board.

Fixes: 5bef6fd79f94 ("spi: Add designware master SPI DM driver used on SoCFPGA")
Signed-off-by: Sean Anderson <seanga2@gmail.com>
[Niklas: rewrite commit message]
Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
---
 drivers/spi/designware_spi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/spi/designware_spi.c b/drivers/spi/designware_spi.c
index f9b19a5ea4..47bea0b376 100644
--- a/drivers/spi/designware_spi.c
+++ b/drivers/spi/designware_spi.c
@@ -266,7 +266,7 @@  static int dw_spi_of_to_plat(struct udevice *bus)
 static void spi_hw_init(struct udevice *bus, struct dw_spi_priv *priv)
 {
 	dw_write(priv, DW_SPI_SSIENR, 0);
-	dw_write(priv, DW_SPI_IMR, 0xff);
+	dw_write(priv, DW_SPI_IMR, 0);
 	dw_write(priv, DW_SPI_SSIENR, 1);
 
 	/*