remoteproc: qcom: q6v5-mss: add SCM probe dependency

[ 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: 6c5a9dc2 ("remoteproc: qcom: Make secure world call for mem ownership switch")
Cc: stable@vger.kernel.org
Signed-off-by: NBrian Norris <briannorris@chromium.org>
[bjorn: Added condition for need_mem_protection, updated commit message]
Signed-off-by: NBjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>

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) {