Hi Mario,
On 12/9/2025 10:28 PM, Mario Limonciello wrote:
On 12/9/2025 7:50 PM, Pratap Nirujogi wrote:
ISP mfd child devices are using genpd and the system suspend-resume
operations between genpd and amdgpu parent device which uses only
runtime suspend-resume are not in sync.
Linux power manager during suspend-resume resuming the genpd devices
earlier than the amdgpu parent device. This is resulting in the below
warning as SMU is in suspended state when genpd attempts to resume ISP.
WARNING: CPU: 13 PID: 5435 at
drivers/gpu/drm/amd/amdgpu/../pm/swsmu/amdgpu_smu.c:398
smu_dpm_set_power_gate+0x36f/0x380 [amdgpu]
To fix this warning isp suspend-resume is handled as part of amdgpu
parent device suspend-resume instead of genpd sequence. Each ISP MFD
child device is marked as dev_pm_syscore_device to skip genpd
suspend-resume and use pm_runtime_force api's to suspend-resume
the devices when callbacks from amdgpu are received.
Signed-off-by: Gjorgji Rosikopulos <[email protected]>
Signed-off-by: Bin Du <[email protected]>
Signed-off-by: Pratap Nirujogi <[email protected]>
Who is the patch author? If you guys worked together, there should be
Co-developed-by tags to represent it.
I authored the patch and is developed by Gjorgji and me. We 3 discussed
and verified different approaches and finally concluded that using
amdgpu suspend-resume path with pm_runtime_force api's is the most
effective way to handle ISP suspend-resume. Will use Co-developed-by
tags in the next version.
---
drivers/gpu/drm/amd/amdgpu/amdgpu_isp.c | 24 ++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_isp.h | 2 +
drivers/gpu/drm/amd/amdgpu/isp_v4_1_1.c | 59 +++++++++++++++++++++++++
3 files changed, 85 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_isp.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_isp.c
index 37270c4dab8d..532f83d783d1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_isp.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_isp.c
@@ -318,12 +318,36 @@ void isp_kernel_buffer_free(void **buf_obj, u64
*gpu_addr, void **cpu_addr)
}
EXPORT_SYMBOL(isp_kernel_buffer_free);
+static int isp_resume(struct amdgpu_ip_block *ip_block)
+{
+ struct amdgpu_device *adev = ip_block->adev;
+ struct amdgpu_isp *isp = &adev->isp;
+
+ if (isp->funcs->hw_resume)
+ return isp->funcs->hw_resume(isp);
+
+ return -ENODEV;
+}
+
+static int isp_suspend(struct amdgpu_ip_block *ip_block)
+{
+ struct amdgpu_device *adev = ip_block->adev;
+ struct amdgpu_isp *isp = &adev->isp;
+
+ if (isp->funcs->hw_suspend)
+ return isp->funcs->hw_suspend(isp);
+
+ return -ENODEV;
+}
+
static const struct amd_ip_funcs isp_ip_funcs = {
.name = "isp_ip",
.early_init = isp_early_init,
.hw_init = isp_hw_init,
.hw_fini = isp_hw_fini,
.is_idle = isp_is_idle,
+ .suspend = isp_suspend,
+ .resume = isp_resume,
.set_clockgating_state = isp_set_clockgating_state,
.set_powergating_state = isp_set_powergating_state,
};
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_isp.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu_isp.h
index d6f4ffa4c97c..9a5d2b1dff9e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_isp.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_isp.h
@@ -38,6 +38,8 @@ struct amdgpu_isp;
struct isp_funcs {
int (*hw_init)(struct amdgpu_isp *isp);
int (*hw_fini)(struct amdgpu_isp *isp);
+ int (*hw_suspend)(struct amdgpu_isp *isp);
+ int (*hw_resume)(struct amdgpu_isp *isp);
};
struct amdgpu_isp {
diff --git a/drivers/gpu/drm/amd/amdgpu/isp_v4_1_1.c
b/drivers/gpu/drm/amd/amdgpu/isp_v4_1_1.c
index 4258d3e0b706..560c398e14fc 100644
--- a/drivers/gpu/drm/amd/amdgpu/isp_v4_1_1.c
+++ b/drivers/gpu/drm/amd/amdgpu/isp_v4_1_1.c
@@ -26,6 +26,7 @@
*/
#include <linux/gpio/machine.h>
+#include <linux/pm_runtime.h>
#include "amdgpu.h"
#include "isp_v4_1_1.h"
@@ -145,6 +146,9 @@ static int isp_genpd_add_device(struct device
*dev, void *data)
return -ENODEV;
}
+ /* The devcies will be managed by the pm ops from the parent */
devices
sure, will fix in the next version.
+ dev_pm_syscore_device(dev, true);
+
exit:
/* Continue to add */
return 0;
@@ -177,12 +181,65 @@ static int isp_genpd_remove_device(struct
device *dev, void *data)
drm_err(&adev->ddev, "Failed to remove dev from genpd
%d\n", ret);
return -ENODEV;
}
+ dev_pm_syscore_device(dev, false);
exit:
/* Continue to remove */
return 0;
}
+static int isp_suspend_device(struct device *dev, void *data)
+{
+ struct platform_device *pdev = container_of(dev, struct
platform_device, dev);
+
+ if (!dev->type || !dev->type->name)
+ return 0;
+ if (strncmp(dev->type->name, "mfd_device", 10))
+ return 0;
+ if (!strncmp(pdev->mfd_cell->name, "amdisp-pinctrl", 14))
+ return 0;
Could we store the mfd_cell pointer instead and just compare the
pointers?
sure, will switch to comparing pointer handles than doing a string
comparision, will address it in the next version.
+
+ return pm_runtime_force_suspend(dev);
+}
+
+static int isp_resume_device(struct device *dev, void *data)
+{
+ struct platform_device *pdev = container_of(dev, struct
platform_device, dev);
+
+ if (!dev->type || !dev->type->name)
+ return 0;
+ if (strncmp(dev->type->name, "mfd_device", 10))
+ return 0;
+ if (!strncmp(pdev->mfd_cell->name, "amdisp-pinctrl", 14))
+ return 0;
same comment as above
sure, will fix it in the next version.
+
+ return pm_runtime_force_resume(dev);
+}
+
+static int isp_v4_1_1_hw_suspend(struct amdgpu_isp *isp)
+{
+ int r;
+
+ r = device_for_each_child(isp->parent, NULL,
+ isp_suspend_device);
+ if (r)
+ dev_err(isp->parent, "failed to suspend hw devices (%d)\n", r);
+
+ return 0;
Shouldn't you return r?
yes, thank you. I should return r here, will fix it in the next version.
+}
+
+static int isp_v4_1_1_hw_resume(struct amdgpu_isp *isp)
+{
+ int r;
+
+ r = device_for_each_child(isp->parent, NULL,
+ isp_resume_device);
+ if (r)
+ dev_err(isp->parent, "failed to resume hw device (%d)\n", r);
+
+ return 0;
Shouldn't you return r?
sure, will fix it in the next version.
Thanks,
Pratap
+}
+
static int isp_v4_1_1_hw_init(struct amdgpu_isp *isp)
{
const struct software_node *amd_camera_node, *isp4_node;
@@ -369,6 +426,8 @@ static int isp_v4_1_1_hw_fini(struct amdgpu_isp
*isp)
static const struct isp_funcs isp_v4_1_1_funcs = {
.hw_init = isp_v4_1_1_hw_init,
.hw_fini = isp_v4_1_1_hw_fini,
+ .hw_suspend = isp_v4_1_1_hw_suspend,
+ .hw_resume = isp_v4_1_1_hw_resume,
};
void isp_v4_1_1_set_isp_funcs(struct amdgpu_isp *isp)
