[Qemu-devel] [PULL 09/21] aspeed/i2c: Fix receive done interrupt handling

[Peter Maydell]

From: Guenter Roeck <address@hidden>

The AST2500 datasheet says:

I2CD10 Interrupt Status Register
       bit 2 Receive Done Interrupt status
             S/W needs to clear this status bit to allow next data receiving

The Rx interrupt done interrupt status bit needs to be cleared
explicitly before the next byte can be received, and must therefore
not be auto-cleared. Also, receiving the next byte must be delayed
until the bit has been cleared.

Signed-off-by: Guenter Roeck <address@hidden>
Signed-off-by: Cédric Le Goater <address@hidden>
Message-id: address@hidden
Signed-off-by: Peter Maydell <address@hidden>
---
 hw/i2c/aspeed_i2c.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/hw/i2c/aspeed_i2c.c b/hw/i2c/aspeed_i2c.c
index ce16efc1367..a2dfa827604 100644
--- a/hw/i2c/aspeed_i2c.c
+++ b/hw/i2c/aspeed_i2c.c
@@ -252,7 +252,8 @@ static void aspeed_i2c_bus_handle_cmd(AspeedI2CBus *bus, 
uint64_t value)
         aspeed_i2c_set_state(bus, I2CD_MACTIVE);
     }
 
-    if (bus->cmd & (I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST)) {
+    if ((bus->cmd & (I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST)) &&
+        !(bus->intr_status & I2CD_INTR_RX_DONE)) {
         aspeed_i2c_handle_rx_cmd(bus);
     }
 
@@ -274,6 +275,7 @@ static void aspeed_i2c_bus_write(void *opaque, hwaddr 
offset,
                                  uint64_t value, unsigned size)
 {
     AspeedI2CBus *bus = opaque;
+    bool handle_rx;
 
     switch (offset) {
     case I2CD_FUN_CTRL_REG:
@@ -294,11 +296,17 @@ static void aspeed_i2c_bus_write(void *opaque, hwaddr 
offset,
         bus->intr_ctrl = value & 0x7FFF;
         break;
     case I2CD_INTR_STS_REG:
+        handle_rx = (bus->intr_status & I2CD_INTR_RX_DONE) &&
+                (value & I2CD_INTR_RX_DONE);
         bus->intr_status &= ~(value & 0x7FFF);
         if (!bus->intr_status) {
             bus->controller->intr_status &= ~(1 << bus->id);
             qemu_irq_lower(bus->controller->irq);
         }
+        if (handle_rx && (bus->cmd & (I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST))) {
+            aspeed_i2c_handle_rx_cmd(bus);
+            aspeed_i2c_bus_raise_interrupt(bus);
+        }
         break;
     case I2CD_DEV_ADDR_REG:
         qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n",
-- 
2.19.0