linux-kernel - [PATCH v2] firmware: ti_sci: Always request response from firmware

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Date:   Tue, 28 May 2019 11:55:10 -0400
From:   "Andrew F. Davis" <afd@...com>
To:     Nishanth Menon <nm@...com>, Tero Kristo <t-kristo@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, "Andrew F . Davis" <afd@...com>
Subject: [PATCH v2] firmware: ti_sci: Always request response from firmware

TI-SCI firmware will only respond to messages when the
TI_SCI_FLAG_REQ_ACK_ON_PROCESSED flag is set. Most messages already do
this, set this for the ones that do not.

This will be enforced in future firmware that better match the TI-SCI
specifications, this patch will not break users of existing firmware.

Fixes: aa276781a64a ("firmware: Add basic support for TI System Control Interface (TI-SCI) protocol")
Signed-off-by: Andrew F. Davis <afd@...com>
Acked-by: Nishanth Menon <nm@...com>
Tested-by: Alejandro Hernandez <ajhernandez@...com>
---

Changes from v1:
 - Rebased on v5.2-rc2

 drivers/firmware/ti_sci.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
index ef93406ace1b..36ce11a67235 100644
--- a/drivers/firmware/ti_sci.c
+++ b/drivers/firmware/ti_sci.c
@@ -466,9 +466,9 @@ static int ti_sci_cmd_get_revision(struct ti_sci_info *info)
 	struct ti_sci_xfer *xfer;
 	int ret;
 
-	/* No need to setup flags since it is expected to respond */
 	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_VERSION,
-				   0x0, sizeof(struct ti_sci_msg_hdr),
+				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
+				   sizeof(struct ti_sci_msg_hdr),
 				   sizeof(*rev_info));
 	if (IS_ERR(xfer)) {
 		ret = PTR_ERR(xfer);
@@ -596,9 +596,9 @@ static int ti_sci_get_device_state(const struct ti_sci_handle *handle,
 	info = handle_to_ti_sci_info(handle);
 	dev = info->dev;
 
-	/* Response is expected, so need of any flags */
 	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_DEVICE_STATE,
-				   0, sizeof(*req), sizeof(*resp));
+				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
+				   sizeof(*req), sizeof(*resp));
 	if (IS_ERR(xfer)) {
 		ret = PTR_ERR(xfer);
 		dev_err(dev, "Message alloc failed(%d)\n", ret);
-- 
2.17.1