[PATCH v3 1/3] remoteproc: qcom_q6v5_pas: propagate dev_pm_genpd_set_performance_state() errors

[Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>]

The proxy power domain enable path discards the return value of
dev_pm_genpd_set_performance_state(), masking failures silently.
When the call fails the performance state is not applied, yet
firmware load proceeds without any indication of the problem.

Capture the return value and bail out on failure, unwinding any
previously voted proxy PDs via the existing unroll path. A proxy
performance state failure indicates that the requested OPP is not
supported by the underlying power domain; continuing would leave
the remoteproc running with an unconfigured voltage/frequency
vote, so treat it as fatal.

Reviewed-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
---
 drivers/remoteproc/qcom_q6v5_pas.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
index a005546c265d..c163e66347f8 100644
--- a/drivers/remoteproc/qcom_q6v5_pas.c
+++ b/drivers/remoteproc/qcom_q6v5_pas.c
@@ -167,7 +167,13 @@ static int qcom_pas_pds_enable(struct qcom_pas *pas, struct device **pds,
 	int i;
 
 	for (i = 0; i < pd_count; i++) {
-		dev_pm_genpd_set_performance_state(pds[i], INT_MAX);
+		ret = dev_pm_genpd_set_performance_state(pds[i], INT_MAX);
+		if (ret) {
+			dev_err(pas->dev,
+				"failed to set proxy PD %d state %u: %d\n",
+				i, INT_MAX, ret);
+			goto unroll_pd_votes;
+		}
 		ret = pm_runtime_get_sync(pds[i]);
 		if (ret < 0) {
 			pm_runtime_put_noidle(pds[i]);
-- 
2.55.0