[PATCH AUTOSEL 4.19 008/167] remoteproc: qcom: q6v5-mss: add SCM probe dependency

From: Sasha Levin
Date: Tue Sep 03 2019 - 12:25:42 EST

From: Brian Norris <briannorris@xxxxxxxxxxxx>

[ Upstream commit bbcda30271752bb7490f2e2aef5411dbcae69116 ]

The memory ownership transfer request is performed using SCM, ensure
that SCM is available before we probe the driver if memory protection is
needed by the subsystem.

Fixes: 6c5a9dc2481b ("remoteproc: qcom: Make secure world call for mem ownership switch")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Brian Norris <briannorris@xxxxxxxxxxxx>
[bjorn: Added condition for need_mem_protection, updated commit message]
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/remoteproc/qcom_q6v5_pil.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/remoteproc/qcom_q6v5_pil.c b/drivers/remoteproc/qcom_q6v5_pil.c
index d7a4b9eca5d25..6a84b6372897d 100644
--- a/drivers/remoteproc/qcom_q6v5_pil.c
+++ b/drivers/remoteproc/qcom_q6v5_pil.c
@@ -1132,6 +1132,9 @@ static int q6v5_probe(struct platform_device *pdev)
if (!desc)
return -EINVAL;

+ if (desc->need_mem_protection && !qcom_scm_is_available())
+ return -EPROBE_DEFER;
rproc = rproc_alloc(&pdev->dev, pdev->name, &q6v5_ops,
desc->hexagon_mba_image, sizeof(*qproc));
if (!rproc) {