aspeed/i2c: Fix receive done interrupt handling

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 <linux@roeck-us.net>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20180914063506.20815-4-clg@kaod.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/hw/i2c/aspeed_i2c.c b/hw/i2c/aspeed_i2c.c
index ce16efc1367a945ea07df733a773908880ebe2a1..a2dfa827604fd4800d47386c765730174a1f9cde 100644 (file)
--- 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",