linux-kernel - [PATCH] interconnect: Restore sync state by ignoring ipa-virt in provider count

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Message-Id: <20220427013226.341209-1-swboyd@chromium.org>
Date:   Tue, 26 Apr 2022 18:32:26 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Georgi Djakov <djakov@...nel.org>
Cc:     linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        linux-pm@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Doug Anderson <dianders@...omium.org>,
        Alex Elder <elder@...aro.org>,
        Taniya Das <quic_tdas@...cinc.com>,
        Mike Tipton <quic_mdtipton@...cinc.com>
Subject: [PATCH] interconnect: Restore sync state by ignoring ipa-virt in provider count

Ignore compatible strings for the IPA virt drivers that were removed in
commits 2fb251c26560 ("interconnect: qcom: sdx55: Drop IP0
interconnects") and 2f3724930eb4 ("interconnect: qcom: sc7180: Drop IP0
interconnects") so that the sync state logic can kick in again.
Otherwise all the interconnects in the system will stay pegged at max
speeds because 'providers_count' is always going to be one larger than
the number of drivers that will ever probe on sc7180 or sdx55. This
fixes suspend on sc7180 and sdx55 devices when you don't have a
devicetree patch to remove the ipa-virt compatible node.

Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Doug Anderson <dianders@...omium.org>
Cc: Alex Elder <elder@...aro.org>
Cc: Taniya Das <quic_tdas@...cinc.com>
Cc: Mike Tipton <quic_mdtipton@...cinc.com>
Fixes: 2fb251c26560 ("interconnect: qcom: sdx55: Drop IP0 interconnects")
Fixes: 2f3724930eb4 ("interconnect: qcom: sc7180: Drop IP0 interconnects")
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 drivers/interconnect/core.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index 9050ca1f4285..c52915a58b22 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -1087,9 +1087,15 @@ static int of_count_icc_providers(struct device_node *np)
 {
 	struct device_node *child;
 	int count = 0;
+	const struct of_device_id ignore_list[] = {
+		{ .compatible = "qcom,sc7180-ipa-virt" },
+		{ .compatible = "qcom,sdx55-ipa-virt" },
+		{}
+	};
 
 	for_each_available_child_of_node(np, child) {
-		if (of_property_read_bool(child, "#interconnect-cells"))
+		if (of_property_read_bool(child, "#interconnect-cells") &&
+		    likely(!of_match_node(ignore_list, child)))
 			count++;
 		count += of_count_icc_providers(child);
 	}

base-commit: 2fb251c265608636fc961b7d38e1a03937e57371
-- 
https://chromeos.dev