diff options
| -rw-r--r-- | MdeModulePkg/Bus/I2c/I2cDxe/I2cHost.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/MdeModulePkg/Bus/I2c/I2cDxe/I2cHost.c b/MdeModulePkg/Bus/I2c/I2cDxe/I2cHost.c index e153a4dc2b..392ca2ade5 100644 --- a/MdeModulePkg/Bus/I2c/I2cDxe/I2cHost.c +++ b/MdeModulePkg/Bus/I2c/I2cDxe/I2cHost.c @@ -930,6 +930,7 @@ I2cHostQueueRequest ( I2C_HOST_CONTEXT *I2cHostContext;
BOOLEAN FirstRequest;
UINTN RequestPacketSize;
+ UINTN StartBit;
SyncEvent = NULL;
FirstRequest = FALSE;
@@ -938,6 +939,27 @@ I2cHostQueueRequest ( if (RequestPacket == NULL) {
return EFI_INVALID_PARAMETER;
}
+
+ if ((SlaveAddress & I2C_ADDRESSING_10_BIT) != 0) {
+ //
+ // 10-bit address, bits 0-9 are used for 10-bit I2C slave addresses,
+ // bits 10-30 are reserved bits and must be zero
+ //
+ StartBit = 10;
+ } else {
+ //
+ // 7-bit address, Bits 0-6 are used for 7-bit I2C slave addresses,
+ // bits 7-30 are reserved bits and must be zero
+ //
+ StartBit = 7;
+ }
+
+ if (BitFieldRead32 ((UINT32)SlaveAddress, StartBit, 30) != 0) {
+ //
+ // Reserved bit set in the SlaveAddress parameter
+ //
+ return EFI_NOT_FOUND;
+ }
I2cHostContext = I2C_HOST_CONTEXT_FROM_PROTOCOL (This);
|