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authorCristian Marussi <cristian.marussi@arm.com>2021-08-03 16:10:16 +0300
committerSudeep Holla <sudeep.holla@arm.com>2021-08-05 12:23:22 +0300
commit2930abcffd9f0b36e8fd4df01f6311eede686817 (patch)
treeac13c6f80501e2de631e362388e43216ebc9fa77 /drivers/firmware
parente9b21c96181c36343597ce789e386d296f93a23b (diff)
downloadlinux-2930abcffd9f0b36e8fd4df01f6311eede686817.tar.xz
firmware: arm_scmi: Make polling mode optional
Add a check for the presence of .poll_done transport operation so that transports that do not need to support polling mode have no need to provide a dummy .poll_done callback either and polling mode can be disabled in the SCMI core for that tranport. Link: https://lore.kernel.org/r/20210803131024.40280-8-cristian.marussi@arm.com Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'drivers/firmware')
-rw-r--r--drivers/firmware/arm_scmi/driver.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 6c77fcc1bcb7..5ff0bcbb4db4 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -751,6 +751,12 @@ static int do_xfer(const struct scmi_protocol_handle *ph,
struct device *dev = info->dev;
struct scmi_chan_info *cinfo;
+ if (xfer->hdr.poll_completion && !info->desc->ops->poll_done) {
+ dev_warn_once(dev,
+ "Polling mode is not supported by transport.\n");
+ return -EINVAL;
+ }
+
/*
* Initialise protocol id now from protocol handle to avoid it being
* overridden by mistake (or malice) by the protocol code mangling with
@@ -787,7 +793,6 @@ static int do_xfer(const struct scmi_protocol_handle *ph,
ktime_t stop = ktime_add_ns(ktime_get(), SCMI_MAX_POLL_TO_NS);
spin_until_cond(scmi_xfer_done_no_timeout(cinfo, xfer, stop));
-
if (ktime_before(ktime_get(), stop)) {
unsigned long flags;