linux-kernel - [PATCH v5 4/5] drivers: soc: xilinx: Fix error message on SGI registration failure

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Message-ID: <20231129112713.22718-5-jay.buddhabhatti@amd.com>
Date:   Wed, 29 Nov 2023 03:27:12 -0800
From:   Jay Buddhabhatti <jay.buddhabhatti@....com>
To:     <michal.simek@....com>, <gregkh@...uxfoundation.org>,
        <nava.kishore.manne@....com>, <sai.krishna.potthuri@....com>,
        <robh@...nel.org>, <marex@...x.de>, <arnd@...db.de>,
        <izhar.ameer.shaikh@....com>, <ruanjinjie@...wei.com>,
        <linus.walleij@...aro.org>, <shubhrajyoti.datta@....com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Jay Buddhabhatti <jay.buddhabhatti@....com>,
        Tanmay Shah <tanmay.shah@....com>
Subject: [PATCH v5 4/5] drivers: soc: xilinx: Fix error message on SGI registration failure

Failure to register SGI for firmware event notification is non-fatal error
when feature is not supported by other modules such as Xen and TF-A. Add
_info level log message for such special case.

Also add XST_PM_INVALID_VERSION error code and map it to -EOPNOSUPP Linux
kernel error code. If feature is not supported or EEMI API version is
mismatch, firmware can return XST_PM_INVALID_VERSION = 4 or
XST_PM_NO_FEATURE = 19 error code.

Co-developed-by: Tanmay Shah <tanmay.shah@....com>
Signed-off-by: Tanmay Shah <tanmay.shah@....com>
Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@....com>
---
 drivers/firmware/xilinx/zynqmp.c        | 4 +++-
 drivers/soc/xilinx/xlnx_event_manager.c | 6 +++++-
 include/linux/firmware/xlnx-zynqmp.h    | 1 +
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 5db8577711c6..84fdec772a46 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -92,6 +92,8 @@ static int zynqmp_pm_ret_code(u32 ret_status)
 		return 0;
 	case XST_PM_NO_FEATURE:
 		return -ENOTSUPP;
+	case XST_PM_INVALID_VERSION:
+		return -EOPNOTSUPP;
 	case XST_PM_NO_ACCESS:
 		return -EACCES;
 	case XST_PM_ABORT_SUSPEND:
@@ -396,7 +398,7 @@ int zynqmp_pm_register_sgi(u32 sgi_num, u32 reset)
 	int ret;
 
 	ret = zynqmp_pm_invoke_fn(TF_A_PM_REGISTER_SGI, NULL, 2, sgi_num, reset);
-	if (!ret)
+	if (ret != -EOPNOTSUPP && !ret)
 		return ret;
 
 	/* try old implementation as fallback strategy if above fails */
diff --git a/drivers/soc/xilinx/xlnx_event_manager.c b/drivers/soc/xilinx/xlnx_event_manager.c
index adb875f89829..27a8d89a0a09 100644
--- a/drivers/soc/xilinx/xlnx_event_manager.c
+++ b/drivers/soc/xilinx/xlnx_event_manager.c
@@ -653,7 +653,11 @@ static int xlnx_event_manager_probe(struct platform_device *pdev)
 
 	ret = zynqmp_pm_register_sgi(sgi_num, 0);
 	if (ret) {
-		dev_err(&pdev->dev, "SGI %d Registration over TF-A failed with %d\n", sgi_num, ret);
+		if (ret == -EOPNOTSUPP)
+			dev_err(&pdev->dev, "SGI registration not supported by TF-A or Xen\n");
+		else
+			dev_err(&pdev->dev, "SGI %d registration failed, err %d\n", sgi_num, ret);
+
 		xlnx_event_cleanup_sgi(pdev);
 		return ret;
 	}
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index ef8c3e252e2c..c28b1d69e6a3 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -172,6 +172,7 @@ enum pm_api_id {
 /* PMU-FW return status codes */
 enum pm_ret_status {
 	XST_PM_SUCCESS = 0,
+	XST_PM_INVALID_VERSION = 4,
 	XST_PM_NO_FEATURE = 19,
 	XST_PM_INTERNAL = 2000,
 	XST_PM_CONFLICT = 2001,
-- 
2.17.1