linux-kernel - [PATCH v2 2/2] soc: kunpeng_hccs: add the check for PCC subspace type

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Date:   Wed, 20 Sep 2023 14:47:03 +0800
From:   Huisong Li <lihuisong@...wei.com>
To:     <rafael@...nel.org>, <rafael.j.wysocki@...el.com>,
        <sudeep.holla@....com>, <xuwei5@...ilicon.com>
CC:     <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <soc@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <liuyonglong@...wei.com>, <lihuisong@...wei.com>
Subject: [PATCH v2 2/2] soc: kunpeng_hccs: add the check for PCC subspace type

Currently, HCCS driver directly uses Generic Communications Channel Shared
Memory Region which is used in type0/1/2 to communicate with platform,
but actually doesn't support type3/4/5.
So this patch adds the check for PCC subspace type.

Signed-off-by: Huisong Li <lihuisong@...wei.com>
---
 drivers/soc/hisilicon/kunpeng_hccs.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/soc/hisilicon/kunpeng_hccs.c b/drivers/soc/hisilicon/kunpeng_hccs.c
index f3810d9d1caa..4ba3bfd45a01 100644
--- a/drivers/soc/hisilicon/kunpeng_hccs.c
+++ b/drivers/soc/hisilicon/kunpeng_hccs.c
@@ -174,6 +174,19 @@ static int hccs_register_pcc_channel(struct hccs_dev *hdev)
 	return rc;
 }
 
+static int hccs_check_pcc_info(struct hccs_dev *hdev)
+{
+	struct pcc_mbox_chan *pcc_chan = hdev->cl_info.pcc_chan;
+
+	if (pcc_chan->type >= ACPI_PCCT_TYPE_EXT_PCC_MASTER_SUBSPACE) {
+		dev_err(hdev->dev, "unsupport for subspace type%u.\n",
+			pcc_chan->type);
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
 static int hccs_check_chan_cmd_complete(struct hccs_dev *hdev)
 {
 	struct hccs_mbox_client_info *cl_info = &hdev->cl_info;
@@ -1224,6 +1237,10 @@ static int hccs_probe(struct platform_device *pdev)
 	if (rc)
 		return rc;
 
+	rc = hccs_check_pcc_info(hdev);
+	if (rc)
+		goto unregister_pcc_chan;
+
 	rc = hccs_get_dev_caps(hdev);
 	if (rc)
 		goto unregister_pcc_chan;
-- 
2.33.0