From: Likun Gao <Likun.Gao@amd.com>
Date: Fri, 20 Nov 2020 07:44:36 +0000 (+0800)
Subject: drm/amd/pm: fix the crash after runtime pm resume
X-Git-Tag: io_uring-5.11-2020-12-23~116^2^2~232
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=ddc3344f165d0e99d877747e73448c5b9fe0f57e;p=linux-2.6-block.git

drm/amd/pm: fix the crash after runtime pm resume

Some features are still disabled after runtime pm resume. This can take
the hardware back.
Unlike other projects, this doesn't need pptable retransfer.

Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index 8e3e7a5bbffe..17a36a962e31 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -918,11 +918,15 @@ static int smu_smc_hw_setup(struct smu_context *smu)
 {
 	struct amdgpu_device *adev = smu->adev;
 	uint32_t pcie_gen = 0, pcie_width = 0;
-	int ret;
+	int ret = 0;
 
 	if (adev->in_suspend && smu_is_dpm_running(smu)) {
 		dev_info(adev->dev, "dpm has been enabled\n");
-		return 0;
+		/* this is needed specifically */
+		if ((adev->asic_type >= CHIP_SIENNA_CICHLID) &&
+		    (adev->asic_type <= CHIP_DIMGREY_CAVEFISH))
+			ret = smu_system_features_control(smu, true);
+		return ret;
 	}
 
 	ret = smu_init_display_count(smu, 0);