linux-kernel - [PATCH 2/3] thermal: intel: int340x: Allow limited thermal MSI support

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Message-ID: <20240723140228.865919-3-srinivas.pandruvada@linux.intel.com>
Date: Tue, 23 Jul 2024 07:02:27 -0700
From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To: rafael@...nel.org,
	daniel.lezcano@...aro.org,
	rui.zhang@...el.com,
	lukasz.luba@....com
Cc: linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Yijun.Shen@...l.com,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [PATCH 2/3] thermal: intel: int340x: Allow limited thermal MSI support

On some Lunar Lake pre-production systems, not all the MSI thermal
vectors are valid. In that case instead of failing module load, continue
with partial thermal interrupt support.

pci_alloc_irq_vectors() can return less than expected maximum vectors.
In that case call devm_request_threaded_irq() only for current maximum
vectors.

Fixes: 7a9a8c5faf41 ("thermal: intel: int340x: Support MSI interrupt for Lunar Lake")
Reported-by: Yijun Shen <Yijun.Shen@...l.com>
Tested-by: Yijun Shen <Yijun.Shen@...l.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
---
 .../int340x_thermal/processor_thermal_device_pci.c     | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
index 2c9c45eb5b4a..ff296626c498 100644
--- a/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
+++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
@@ -292,18 +292,18 @@ static void proc_thermal_free_msi(struct pci_dev *pdev, struct proc_thermal_pci
 
 static int proc_thermal_setup_msi(struct pci_dev *pdev, struct proc_thermal_pci *pci_info)
 {
-	int ret, i, irq;
+	int ret, i, irq, count;
 
-	ret = pci_alloc_irq_vectors(pdev, 1, MSI_THERMAL_MAX, PCI_IRQ_MSI | PCI_IRQ_MSIX);
-	if (ret < 0) {
+	count = pci_alloc_irq_vectors(pdev, 1, MSI_THERMAL_MAX, PCI_IRQ_MSI | PCI_IRQ_MSIX);
+	if (count < 0) {
 		dev_err(&pdev->dev, "Failed to allocate vectors!\n");
-		return ret;
+		return count;
 	}
 
 	dev_info(&pdev->dev, "msi enabled:%d msix enabled:%d\n", pdev->msi_enabled,
 		 pdev->msix_enabled);
 
-	for (i = 0; i < MSI_THERMAL_MAX; i++) {
+	for (i = 0; i < count; i++) {
 		irq =  pci_irq_vector(pdev, i);
 
 		ret = devm_request_threaded_irq(&pdev->dev, irq, proc_thermal_irq_handler,
-- 
2.45.0