platform/chrome: Use proper protocol transfer function

[ Upstream commit d48b8c58c57f6edbe2965f0a5f62c5cf9593ca96 ]

pkt_xfer should be used for protocol v3, and cmd_xfer otherwise. We had
one instance of these functions correct, but not the second, fall-back
case. We use the fall-back only when the first command returns an
IN_PROGRESS status, which is only used on some EC firmwares where we
don't want to constantly poll the bus, but instead back off and
sleep/retry for a little while.

Fixes: 2c7589af3c4d ("mfd: cros_ec: add proto v3 skeleton")
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 8dfa7fc..e7bbdf9 100644 (file)
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -60,12 +60,14 @@ static int send_command(struct cros_ec_device *ec_dev,
                        struct cros_ec_command *msg)
 {
        int ret;
+       int (*xfer_fxn)(struct cros_ec_device *ec, struct cros_ec_command *msg);
 
        if (ec_dev->proto_version > 2)
-               ret = ec_dev->pkt_xfer(ec_dev, msg);
+               xfer_fxn = ec_dev->pkt_xfer;
        else
-               ret = ec_dev->cmd_xfer(ec_dev, msg);
+               xfer_fxn = ec_dev->cmd_xfer;
 
+       ret = (*xfer_fxn)(ec_dev, msg);
        if (msg->result == EC_RES_IN_PROGRESS) {
                int i;
                struct cros_ec_command *status_msg;
@@ -88,7 +90,7 @@ static int send_command(struct cros_ec_device *ec_dev,
                for (i = 0; i < EC_COMMAND_RETRIES; i++) {
                        usleep_range(10000, 11000);
 
-                       ret = ec_dev->cmd_xfer(ec_dev, status_msg);
+                       ret = (*xfer_fxn)(ec_dev, status_msg);
                        if (ret < 0)
                                break;