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[PATCH v3 2/6] hw/ssi: imx_spi: Disable chip selects when controller is

From: Bin Meng
Subject: [PATCH v3 2/6] hw/ssi: imx_spi: Disable chip selects when controller is disabled
Date: Sat, 9 Jan 2021 20:35:41 +0800

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>


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 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/ssi/imx_spi.c b/hw/ssi/imx_spi.c
index e605049a21..8d429e703f 100644
--- a/hw/ssi/imx_spi.c
+++ b/hw/ssi/imx_spi.c
@@ -353,6 +353,11 @@ static void imx_spi_write(void *opaque, hwaddr offset, 
uint64_t value,
         if (!imx_spi_is_enabled(s)) {
             /* device is disabled, so this is a reset */
+            for (int i = 0; i < ECSPI_NUM_CS; i++) {
+                qemu_set_irq(s->cs_lines[i], 1);
+            }

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