This is a note to let you know that I've just added the patch titled
drm/amd/pm: avoid duplicate powergate/ungate setting
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-amd-pm-avoid-duplicate-powergate-ungate-setting.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6ee27ee27ba8b2e725886951ba2d2d87f113bece Mon Sep 17 00:00:00 2001
From: Evan Quan <evan.quan@xxxxxxx>
Date: Fri, 5 Nov 2021 15:25:30 +0800
Subject: drm/amd/pm: avoid duplicate powergate/ungate setting
From: Evan Quan <evan.quan@xxxxxxx>
commit 6ee27ee27ba8b2e725886951ba2d2d87f113bece upstream.
Just bail out if the target IP block is already in the desired
powergate/ungate state. This can avoid some duplicate settings
which sometimes may cause unexpected issues.
Link: https://lore.kernel.org/all/YV81vidWQLWvATMM@xxxxxxx/
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=214921
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=215025
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1789
Fixes: bf756fb833cb ("drm/amdgpu: add missing cleanups for Polaris12 UVD/VCE on suspend")
Signed-off-by: Evan Quan <evan.quan@xxxxxxx>
Tested-by: Borislav Petkov <bp@xxxxxxx>
Reviewed-by: Lijo Lazar <lijo.lazar@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 3 +++
drivers/gpu/drm/amd/include/amd_shared.h | 3 ++-
drivers/gpu/drm/amd/pm/amdgpu_dpm.c | 10 ++++++++++
drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h | 8 ++++++++
4 files changed, 23 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3532,6 +3532,9 @@ int amdgpu_device_init(struct amdgpu_dev
adev->rmmio_size = pci_resource_len(adev->pdev, 2);
}
+ for (i = 0; i < AMD_IP_BLOCK_TYPE_NUM; i++)
+ atomic_set(&adev->pm.pwr_state[i], POWER_STATE_UNKNOWN);
+
adev->rmmio = ioremap(adev->rmmio_base, adev->rmmio_size);
if (adev->rmmio == NULL) {
return -ENOMEM;
--- a/drivers/gpu/drm/amd/include/amd_shared.h
+++ b/drivers/gpu/drm/amd/include/amd_shared.h
@@ -98,7 +98,8 @@ enum amd_ip_block_type {
AMD_IP_BLOCK_TYPE_ACP,
AMD_IP_BLOCK_TYPE_VCN,
AMD_IP_BLOCK_TYPE_MES,
- AMD_IP_BLOCK_TYPE_JPEG
+ AMD_IP_BLOCK_TYPE_JPEG,
+ AMD_IP_BLOCK_TYPE_NUM,
};
enum amd_clockgating_state {
--- a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
@@ -927,6 +927,13 @@ int amdgpu_dpm_set_powergating_by_smu(st
{
int ret = 0;
const struct amd_pm_funcs *pp_funcs = adev->powerplay.pp_funcs;
+ enum ip_power_state pwr_state = gate ? POWER_STATE_OFF : POWER_STATE_ON;
+
+ if (atomic_read(&adev->pm.pwr_state[block_type]) == pwr_state) {
+ dev_dbg(adev->dev, "IP block%d already in the target %s state!",
+ block_type, gate ? "gate" : "ungate");
+ return 0;
+ }
switch (block_type) {
case AMD_IP_BLOCK_TYPE_UVD:
@@ -979,6 +986,9 @@ int amdgpu_dpm_set_powergating_by_smu(st
break;
}
+ if (!ret)
+ atomic_set(&adev->pm.pwr_state[block_type], pwr_state);
+
return ret;
}
--- a/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h
+++ b/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h
@@ -417,6 +417,12 @@ struct amdgpu_dpm {
enum amd_dpm_forced_level forced_level;
};
+enum ip_power_state {
+ POWER_STATE_UNKNOWN,
+ POWER_STATE_ON,
+ POWER_STATE_OFF,
+};
+
struct amdgpu_pm {
struct mutex mutex;
u32 current_sclk;
@@ -452,6 +458,8 @@ struct amdgpu_pm {
struct i2c_adapter smu_i2c;
struct mutex smu_i2c_mutex;
struct list_head pm_attr_list;
+
+ atomic_t pwr_state[AMD_IP_BLOCK_TYPE_NUM];
};
#define R600_SSTU_DFLT 0
Patches currently in stable-queue which might be from evan.quan@xxxxxxx are
queue-5.15/drm-amd-pm-avoid-duplicate-powergate-ungate-setting.patch
