[PATCH v4 2/7] hw/i2c: Read FIFO during RXF_CTL change in NPCM7XX SMBus

[Hao Wu]

Originally we read in from SMBus when RXF_STS is cleared. However,
the driver clears RXF_STS before setting RXF_CTL, causing the SM bus
module to read incorrect amount of bytes in FIFO mode when the number
of bytes read changed. This patch fixes this issue.

Signed-off-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Titus Rwantare <titusr@google.com>
Acked-by: Corey Minyard <cminyard@mvista.com>
---
 hw/i2c/npcm7xx_smbus.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/hw/i2c/npcm7xx_smbus.c b/hw/i2c/npcm7xx_smbus.c
index f18e311556..1435daea94 100644
--- a/hw/i2c/npcm7xx_smbus.c
+++ b/hw/i2c/npcm7xx_smbus.c
@@ -637,9 +637,6 @@ static void npcm7xx_smbus_write_rxf_sts(NPCM7xxSMBusState 
*s, uint8_t value)
 {
     if (value & NPCM7XX_SMBRXF_STS_RX_THST) {
         s->rxf_sts &= ~NPCM7XX_SMBRXF_STS_RX_THST;
-        if (s->status == NPCM7XX_SMBUS_STATUS_RECEIVING) {
-            npcm7xx_smbus_recv_fifo(s);
-        }
     }
 }
 
@@ -651,6 +648,9 @@ static void npcm7xx_smbus_write_rxf_ctl(NPCM7xxSMBusState 
*s, uint8_t value)
         new_ctl = KEEP_OLD_BIT(s->rxf_ctl, new_ctl, NPCM7XX_SMBRXF_CTL_LAST);
     }
     s->rxf_ctl = new_ctl;
+    if (s->status == NPCM7XX_SMBUS_STATUS_RECEIVING) {
+        npcm7xx_smbus_recv_fifo(s);
+    }
 }
 
 static uint64_t npcm7xx_smbus_read(void *opaque, hwaddr offset, unsigned size)
-- 
2.33.1.1089.g2158813163f-goog