linux-kernel - [PATCH 4.14 40/45] firmware: ti_sci: Always request response from firmware

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Date:   Wed, 18 Sep 2019 08:19:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Andrew F. Davis" <afd@...com>,
        Nishanth Menon <nm@...com>,
        Alejandro Hernandez <ajhernandez@...com>,
        Tero Kristo <t-kristo@...com>,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>
Subject: [PATCH 4.14 40/45] firmware: ti_sci: Always request response from firmware

From: Andrew F. Davis <afd@...com>

commit 66f030eac257a572fbedab3d9646d87d647351fd upstream.

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>
Signed-off-by: Tero Kristo <t-kristo@...com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/firmware/ti_sci.c
+++ b/drivers/firmware/ti_sci.c
@@ -471,9 +471,9 @@ static int ti_sci_cmd_get_revision(struc
 	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);
@@ -601,9 +601,9 @@ static int ti_sci_get_device_state(const
 	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);