[PATCH v4 3/6] hw/ssi: imx_spi: Disable chip selects when controller is disabled

[Bin Meng <bmeng.cn@gmail.com>]

From: Xuzhou Cheng <xuzhou.cheng@windriver.com>

When a write to ECSPI_CONREG register to disable the SPI controller,
imx_spi_reset() is called to reset the controller, but chip select
lines should have been disabled, otherwise the state machine of any
devices (e.g.: SPI flashes) connected to the SPI master is stuck to
its last state and responds incorrectly to any follow-up commands.

Fixes: c906a3a01582 ("i.MX: Add the Freescale SPI Controller")
Signed-off-by: Xuzhou Cheng <xuzhou.cheng@windriver.com>
Signed-off-by: Bin Meng <bin.meng@windriver.com>

---

(no changes since v3)

Changes in v3:
- Move the chip selects disable out of imx_spi_reset()

Changes in v2:
- Fix the "Fixes" tag in the commit message

 hw/ssi/imx_spi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/ssi/imx_spi.c b/hw/ssi/imx_spi.c
index 2c4c5ec1b8..168ea95440 100644
--- a/hw/ssi/imx_spi.c
+++ b/hw/ssi/imx_spi.c
@@ -246,9 +246,15 @@ static void imx_spi_reset(DeviceState *dev)
 
 static void imx_spi_hard_reset(IMXSPIState *s)
 {
+    int i;
+
     imx_spi_reset(DEVICE(s));
 
     imx_spi_update_irq(s);
+
+    for (i = 0; i < ECSPI_NUM_CS; i++) {
+        qemu_set_irq(s->cs_lines[i], 1);
+    }
 }
 
 static uint64_t imx_spi_read(void *opaque, hwaddr offset, unsigned size)
-- 
2.25.1