linux-kernel - [PATCH v3] platform/chrome: Use proper protocol transfer function

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Message-Id: <20170908205011.77986-1-briannorris@chromium.org>
Date:   Fri,  8 Sep 2017 13:50:11 -0700
From:   Brian Norris <briannorris@...omium.org>
To:     Olof Johansson <olof@...om.net>, Benson Leung <bleung@...omium.org>
Cc:     Lee Jones <lee.jones@...aro.org>, <linux-kernel@...r.kernel.org>,
        Doug Anderson <dianders@...omium.org>,
        Brian Norris <computersforpeace@...il.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Shawn Nematbakhsh <shawnn@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Enric Balletbo <enric.balletbo@...labora.co.uk>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Brian Norris <briannorris@...omium.org>
Subject: [PATCH v3] platform/chrome: Use proper protocol transfer function

From: Shawn Nematbakhsh <shawnn@...omium.org>

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@...omium.org>
Signed-off-by: Brian Norris <briannorris@...omium.org>
Reviewed-by: Javier Martinez Canillas <javier@....samsung.com>
---
v3:
 * Added Javier's reviewed tag
 * It's been > 8 months since [1], so why not? And hey, Benson's officially in
   MAINTAINERS now! Too bad no one told me.

 [1] https://patchwork.kernel.org/patch/9450633/


v2:
 * Add Benson in 'To:'
 * make subject prefix more obvious

 drivers/platform/chrome/cros_ec_proto.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 8dfa7fcb1248..e7bbdf947bbc 100644
--- 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;
 
-- 
2.14.1.581.gf28d330327-goog