linux-kernel - [PATCH 2/2] firmware: arm_scmi: Skip adding bad duplicates

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Message-ID: <20240904025633.2881671-3-quic_sibis@quicinc.com>
Date: Wed, 4 Sep 2024 08:26:33 +0530
From: Sibi Sankar <quic_sibis@...cinc.com>
To: <sudeep.holla@....com>, <cristian.marussi@....com>
CC: <linux-kernel@...r.kernel.org>, <arm-scmi@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-arm-msm@...r.kernel.org>, <quic_sibis@...cinc.com>,
        <johan@...nel.org>, <konradybcio@...nel.org>
Subject: [PATCH 2/2] firmware: arm_scmi: Skip adding bad duplicates

Ensure that the bad duplicates reported by the platform firmware doesn't
get added to the opp-tables.

Signed-off-by: Sibi Sankar <quic_sibis@...cinc.com>
---
 drivers/firmware/arm_scmi/perf.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index 2d77b5f40ca7..114c3dd70ede 100644
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -386,9 +386,11 @@ process_response_opp(struct device *dev, struct perf_dom_info *dom,
 		le16_to_cpu(r->opp[loop_idx].transition_latency_us);
 
 	ret = xa_insert(&dom->opps_by_lvl, opp->perf, opp, GFP_KERNEL);
-	if (ret)
+	if (ret) {
 		dev_warn(dev, "Failed to add opps_by_lvl at %d for %s - ret:%d\n",
 			 opp->perf, dom->info.name, ret);
+		opp->perf = 0;
+	}
 }
 
 static inline void
@@ -404,9 +406,12 @@ process_response_opp_v4(struct device *dev, struct perf_dom_info *dom,
 		le16_to_cpu(r->opp[loop_idx].transition_latency_us);
 
 	ret = xa_insert(&dom->opps_by_lvl, opp->perf, opp, GFP_KERNEL);
-	if (ret)
+	if (ret) {
 		dev_warn(dev, "Failed to add opps_by_lvl at %d for %s - ret:%d\n",
 			 opp->perf, dom->info.name, ret);
+		opp->perf = 0;
+		return;
+	}
 
 	/* Note that PERF v4 reports always five 32-bit words */
 	opp->indicative_freq = le32_to_cpu(r->opp[loop_idx].indicative_freq);
@@ -871,6 +876,10 @@ static int scmi_dvfs_device_opps_add(const struct scmi_protocol_handle *ph,
 		else
 			freq = dom->opp[idx].indicative_freq * dom->mult_factor;
 
+		/* Skip all invalid frequencies reported by the firmware */
+		if (!freq)
+			continue;
+
 		/* All OPPs above the sustained frequency are treated as turbo */
 		data.turbo = freq > dom->sustained_freq_khz * 1000;
 
-- 
2.34.1