[PATCH 3/6] drm/amdgpu: Restore msix after FLR

[Chen, Guchun]

[AMD Public Use]

amdgpu_irq_restore_msix should be one static function?

Regards,
Guchun

-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Emily Deng
Sent: Tuesday, March 30, 2021 12:42 PM
To: amd-gfx at lists.freedesktop.org
Cc: Deng, Emily <Emily.Deng at amd.com>
Subject: [PATCH 3/6] drm/amdgpu: Restore msix after FLR

From: "Emily.Deng" <Emily.Deng at amd.com>

After FLR, the msix will be cleared, so need to re-enable it.

v2:
Change name with amdgpu_irq prefix, remove #ifdef.

Signed-off-by: Emily.Deng <Emily.Deng at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
index 03412543427a..8936589bd7f9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c
@@ -277,6 +277,17 @@ static bool amdgpu_msi_ok(struct amdgpu_device *adev)
 	return true;
 }
 
+void amdgpu_irq_restore_msix(struct amdgpu_device *adev) {
+	u16 ctrl;
+
+	pci_read_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
+	ctrl &= ~PCI_MSIX_FLAGS_ENABLE;
+	pci_write_config_word(adev->pdev, adev->pdev->msix_cap + PCI_MSIX_FLAGS, ctrl);
+	ctrl |= PCI_MSIX_FLAGS_ENABLE;
+	pci_write_config_word(adev->pdev, adev->pdev->msix_cap + 
+PCI_MSIX_FLAGS, ctrl); }
+
 /**
  * amdgpu_irq_init - initialize interrupt handling
  *
@@ -558,6 +569,7 @@ void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)  {
 	int i, j, k;
 
+	amdgpu_irq_restore_msix(adev);
 	for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) {
 		if (!adev->irq.client[i].sources)
 			continue;
--
2.25.1

_______________________________________________
amd-gfx mailing list
amd-gfx at lists.freedesktop.org
https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Famd-gfx&data=04%7C01%7Cguchun.chen%40amd.com%7C6aff296c96104aef176208d8f3362acf%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637526761267513989%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=BG4P%2FbJmn8PiLR%2BxTys8cVWK6924LWftjTXjKqrgnkg%3D&reserved=0