linux-kernel - [PATCH 5/5] PCI: tegra194: Handle errors in BPMP response

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Date:   Wed, 15 Sep 2021 11:55:17 +0300
From:   Mikko Perttunen <mperttunen@...dia.com>
To:     rafael@...nel.org, viresh.kumar@...aro.org,
        thierry.reding@...il.com, jonathanh@...dia.com,
        krzysztof.kozlowski@...onical.com, lorenzo.pieralisi@....com,
        robh@...nel.org, kw@...ux.com, p.zabel@...gutronix.de,
        rui.zhang@...el.com, daniel.lezcano@...aro.org, amitk@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        Mikko Perttunen <mperttunen@...dia.com>
Subject: [PATCH 5/5] PCI: tegra194: Handle errors in BPMP response

The return value from tegra_bpmp_transfer indicates the success or
failure of the IPC transaction with BPMP. If the transaction
succeeded, we also need to check the actual command's result code.
Add code to do this.

Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
---
 drivers/pci/controller/dwc/pcie-tegra194.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 904976913081..08afd2e72ec5 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -1162,6 +1162,7 @@ static int tegra_pcie_bpmp_set_ctrl_state(struct tegra_pcie_dw *pcie,
 	struct mrq_uphy_response resp;
 	struct tegra_bpmp_message msg;
 	struct mrq_uphy_request req;
+	int err;
 
 	/* Controller-5 doesn't need to have its state set by BPMP-FW */
 	if (pcie->cid == 5)
@@ -1181,7 +1182,13 @@ static int tegra_pcie_bpmp_set_ctrl_state(struct tegra_pcie_dw *pcie,
 	msg.rx.data = &resp;
 	msg.rx.size = sizeof(resp);
 
-	return tegra_bpmp_transfer(pcie->bpmp, &msg);
+	err = tegra_bpmp_transfer(pcie->bpmp, &msg);
+	if (err)
+		return err;
+	if (msg.rx.ret)
+		return -EINVAL;
+
+	return 0;
 }
 
 static int tegra_pcie_bpmp_set_pll_state(struct tegra_pcie_dw *pcie,
-- 
2.32.0