From: Alex Deucher <alexander.deucher@xxxxxxx>
So we lock software as well as hardware access to the bus.
v2: fix mutex handling.
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Reviewed-by: Luben Tuikov <luben.tuikov@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c | 19 +++++++++----------
drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h | 1 +
2 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c b/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c
index 5c7d769aee3fba..1d8f6d5180e099 100644
--- a/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c
+++ b/drivers/gpu/drm/amd/amdgpu/smu_v11_0_i2c.c
@@ -584,12 +584,11 @@ static void lock_bus(struct i2c_adapter *i2c, unsigned int flags)
{
struct amdgpu_device *adev = to_amdgpu_device(i2c);
- if (!smu_v11_0_i2c_bus_lock(i2c)) {
+ mutex_lock(&adev->pm.smu_i2c_mutex);
+ if (!smu_v11_0_i2c_bus_lock(i2c))
DRM_ERROR("Failed to lock the bus from SMU");
- return;
- }
-
- adev->pm.bus_locked = true;
+ else
+ adev->pm.bus_locked = true;
}
static int trylock_bus(struct i2c_adapter *i2c, unsigned int flags)
@@ -602,12 +601,11 @@ static void unlock_bus(struct i2c_adapter *i2c, unsigned int flags)
{
struct amdgpu_device *adev = to_amdgpu_device(i2c);
- if (!smu_v11_0_i2c_bus_unlock(i2c)) {
+ if (!smu_v11_0_i2c_bus_unlock(i2c))
DRM_ERROR("Failed to unlock the bus from SMU");
- return;
- }
-
- adev->pm.bus_locked = false;
+ else
+ adev->pm.bus_locked = false;
+ mutex_unlock(&adev->pm.smu_i2c_mutex);
}
static const struct i2c_lock_operations smu_v11_0_i2c_i2c_lock_ops = {
@@ -665,6 +663,7 @@ int smu_v11_0_i2c_control_init(struct i2c_adapter *control)
struct amdgpu_device *adev = to_amdgpu_device(control);
int res;
+ mutex_init(&adev->pm.smu_i2c_mutex);
control->owner = THIS_MODULE;
control->class = I2C_CLASS_SPD;
control->dev.parent = &adev->pdev->dev;
diff --git a/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h b/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h
index f6e0e7d8a00771..d03e6fa2bf1adf 100644
--- a/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h
+++ b/drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h
@@ -450,6 +450,7 @@ struct amdgpu_pm {
/* Used for I2C access to various EEPROMs on relevant ASICs */
struct i2c_adapter smu_i2c;
+ struct mutex smu_i2c_mutex;
struct list_head pm_attr_list;
};
--
2.32.0
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